On the downlink capacity of TDD CDMA systems using a pre-rake

Size: px
Start display at page:

Download "On the downlink capacity of TDD CDMA systems using a pre-rake"

Transcription

1 André No Barreto Dresden University of echnoogy Address : Dresden University of echnoogy Departent of Eectrica Engineering Mobie Counications Systes Dresden 0106 Gerany e : Fax : e-ai : no@ifn.et.tu-dresden.de On the downink capacity of DD CDMA systes using a pre-rake he Pre-Rake technique for the downink transission in DD-based CDMA wireess systes has been shown to provide greater capacity and a siper receiver design at the obie receiver. Nevertheess this technique is very affected by fast changing channes, since it reies on upink channe easureents for the downink transission. In this paper a sei-anaytica approach to the perforance, incuding channe coding is presented. Furtherore we anayse the pre-rake perforance, incuding its behaviour with changing channes, with and without a channe predictor. Finay we show that the pre-rake axiises the correation between the received and the desired signa, and this deonstration provides us the eans to obtain an instant power contro at bit eve that iproves perforance significanty. ey opics : Persona Counications Systes Mutipe Access echniques Modeing and Siuation of Counications Systes

2 On the downink capacity of DD CDMA systes using a pre-rake ABSRAC he Pre-Rake technique for the downink transission in DD-based CDMA wireess systes has been shown to provide greater capacity and a siper receiver design at the obie receiver. Nevertheess this technique is very affected by fast changing channes, since it reies on upink channe easureents for the downink transission. In this paper a sei-anaytica approach to the perforance, incuding channe coding is presented. Furtherore we anayse the pre-rake perforance, incuding its behaviour with changing channes, with and without a channe predictor. Finay we show that the pre-rake axiises the correation between the received and the desired signa, and this deonstration provides us the eans to obtain an instant power contro at bit eve that iproves perforance significanty. 1 - Introduction Code division utipe access (CDMA) based on direct sequence spread spectru techniques has been gaining a ot of ground in obie counications systes atey. his technique is aready being used in IS-95 systes under operation and ipeentation in severa countries wordwide and it is ikey to be used in the next generation of obie counication systes [3,4] currenty under standardisation. Initia studies have spread the beief that the downink capacity in CDMA systes is greater than in the upink, but soe ore recent studies [5] show that in practice the opposite can be observed, and the downink is the iiting ink in ters of capacity for CDMA systes. his is due to severa facts. Firsty, the iportance of downink power contro has been often negected. Even though the requireents are not as harsh as in the upink, different users suffer different channe ipairents and are subject to different interference patterns, and thus a ore efficient power contro schee is needed. Secondy, soft handover ipies that the sae signa can be transitted fro severa base stations at the sae tie, increasing the downink interference. And ast, the possibe capacity gains achievabe with orthogona codes are iited due to utipath propagation. In future counication systes the use of uti-user detection[6] is envisaged to increase the capacity, but its use is ore ikey in the upink ony. In the downink the high copexity of this technique akes its ipeentation prohibitive for a obie station in ters of cost and power consuption, not to ention the need for a higher André No Barreto and Gerhard Fettweis Dresden University of echnoogy Chair for Mobie Counication Systes, 0106 Dresden, Gerany <no,fettweis>@ifn.et-tu-dresden.de signaing traffic. he transission of a piot signa for each user in the upink, as proposed for the UMS standard [4], woud aso reove the need for non-coherent detection, further increasing the transission perforance and hence the capacity. hese facts ipy that the downink capacity ust be aso increased, whie keeping the obie station design as sipe as possibe. his need is even greater if we consider that, unike voice, any services to be supported by future counications services are ikey to be asyetrica, such as internet browsing and video on deand, and that in these services the downink traffic is uch higher in the downink. Another technique that has been increasingy popuar is ie Division Dupexing (DD) in which the sae carrier is used for both inks in different tie sots. One property of such systes is that, since the sae frequency is used, the channe characteristics are neary the sae in both inks, provided the channe does not change too rapidy. his is usefu when sart antennas are used, since the optiised pattern used for upink reception is aso optiised for downink transission. his fact aso ipies the knowedge of the channe ipuse response before transission, and that can be used to achieve utipath diversity gain using signa processing at the transitter, instead of epoying a Rake receiver at the obie station. his technique, known as pre-rake, was first suggested by Esaizadeh, Sourour and Nakagawa[1,], and it wi be better described and anaysed in Section, incuding channe coding. With a pre-rake transitter at the BS, the obie station needs just a atched fiter receiver instead of a Rake receiver, and can be kept sipe and cheap; the signa processing is transferred to the base station, where copexity is not such an iportant issue. But the greatest advantage obtained with the pre-rake is a substantia capacity increase, which wi be deonstrated sei-anayticay in Section and through siuation in Section 3. his is particuary iportant if the need for a capacity increase in the downink is considered, as discussed above. One ajor probe with the pre-rake is that it suffers perforance degradation in fast-changing channes, since the channe estiates used in the downink are obtained in the upink period. In Section 3 we see how this probe can be overcoe with a suitabe channe predictor. In Section 4 it wi be shown that the pre-rake axiises the correation between the desired and the received signa for a atched fiter receiver, and based on this resuts an instant power contro echanis on bit eve wi be proposed that further increases the capacity with no extra receiver copexity. On the downink capacity of DD CDMA systes using a pre-rake 1

3 - Syste description and perforance anaysis As a channe ode we have considered a tie-invariant baseband discrete tapped deay ine with sape spacing equa to the chip period. he copex channe ipuse response for user i is given by: h i g i, δ( k ) where L is the nuber of paths and g i, is the copex path gain of path for user i. For a syste with N users, the copex transitted signa is : sk ( ) s i i 0 d c i i i 0 where d i (k) is the copex desired sequence obtained after channe coding and copex oduation and c i (k) is the copex spreading code. he I and Q coponents of the desired signa and of the code are correated separatey, i.e. x y Re() x Re() y jix [ () I() y ] We aso assue coherent QPS oduation with unit transit power, such that c i (k)±1±j and d i ( ± 1 ± j). We wi first investigate the syste perforance with a Rake receiver. he anaysis wi be perfored for user 0, with no oss at generaity. In this configuration, the signa s(k) is transitted with no further processing. and the signa received by user 0 can be given by: r 0 g 0, d i ( k ) c i ( k ) ν (4) i 0 where ν(k) is a zero ean gaussian rando variabe with variance N 0, the power spectra density of the white gaussian noise. At the Rake receiver this signa is correated with the spreading code and integrated over sybos to obtain the decision variabe at the decoder input. Assuing axiu ratio cobining with perfect channe estiation, and considering that the data sybo is constant in sybos we have the decision variabe y 0 g 0, r 0 ( k ) c 0 0 g 0, d0 n sef n u n where n sef is the sef-interference, n u is the uti-user interference and n the gaussian noise coponent with variance (1) () (3) (5) var( n) N 0 g 0, Now et a jn, d j ( k n) c j ( k n) c 0. hen the interference coponents can be expressed as: n sef g 0, d 0 ( k ) 0 c 0 ( k ) c 0 and g 0, a 0, n ( ), n 0 n n u i 1 0 g i, g 0 d, i ( k ) c i ( k ) c 0 N 1 α g i, g d 0, i c i c 0 i 1 g i, a i, i 1 n ( ), n 0 n α N 1 g i, g a 0, i, 0 i 1 where α0 if the codes are orthogona over copex sybos and α1 otherwise. We have assued in the above equations that orthogona codes behave ike rando codes if not synchronised., what is reasonabe if we assue that orthogona codes are further correated with a scrabing code. It can be safey assued that, for n 0 or j 0, a j,n (k) are i.i.d rando variabes with equa probabiity p1/4 of assuing the vaues a jn, ( ± 1 ± j), such that var[a j,n (k)]1. Furtherore, it is cear that n sef and n u have zero ean. Hence the interference variance can be given by: var( n sef ) g 0, n ( ), n 0 n var( n u ) ( )var( n sef ) α g 0, We can assue that the interference is a gaussian rando variabe, at east for high processing gains and high nuber (6) (7) (8) (9) On the downink capacity of DD CDMA systes using a pre-rake

4 of users. In anaogy to a white noise process we ay then define the interference power spectra density I 0, which, since n sef and n u are independent, is equa to [ var( n sef ) var( n u )] I (10) g 0, A siiar anaysis can be carried out for the Rake receiver, but in this case the channe ipuse response is atched at the transitter. We have thus: s s i β i g i, d i ( k ) i 0 i 0 0 c i ( k ) where 1 β i g i, (11) (1) is a noraising factor to assure that a users transit with sae power. By foowing the sae anaysis done for the Rake receiver we have at user 0 the foowing decision variabe before the decoder: y 0 β i g 0, g i, d i ( k ) i 0 0 c i ( k ) c g 0, d0 n se f, g 0, n u, n (13) Now the noise variance var(n )N 0, and the variance of the interference coponents are given by var( n se f, ) Siiary to equation (10), we have now (14) (15) For a given channe configuration, the bit error probabiity is a function of the bit energy to the noise pus interference power spectra density at the receiver, i.e., P e F(E b /(I 0 N 0 )). With knowedge of these functions and of the channe probabiity distribution p(g) we can obtain the ean bit error rate, as foows. where the bit energy is g 0, (16) (17) for both Rake and pre-rake, with R the code rate; and the interference can be obtained fro (10) and (15). An anaytica soution of (16) for a Rake receiver without coding is possibe[7], but it is uch ore difficut for the pre-rake. Furtherore, when convoutiona channe coding is considered, the usua union bound approxiation[7] is good for high signa-to-interference ratios, but too pessiistic for ow SIR vaues, and such cases occur with a certain probabiity in Rayeigh faded environents. We have then decided for a sei-anaytica approach. We assue that the path gains g i, are independent rando variabes with ean and variance given by a particuar channe ode. hen, according to this ode, the path gains are randoy chosen and the desired signa ean; and noise and interference variance are obtained fro the equations above, and the resuts appied to the error function. For ow SIR vaues the error function F(E b /(I 0 N 0 )) was n ( ) n 0 g 0,, n var( n u, ) β i g i, i 1 n ( ), n 0 n α β i g i, i 1 [ var( n se f, ) var( n u, )] I 0, BER E b ( g) E b ( g) F dg I 0 ( g) N g R 0, On the downink capacity of DD CDMA systes using a pre-rake 3

5 obtained by siuation and approxiated by a poynoia. For high SIR vaues the union bound was used. his can be seen in Fig. 1 for a convoutiona code of rate R1/8 and constraint ength 9, which was used for the resuts shown. poynoia appr. union bound Fig. 1 - Modeing of the channe code his procedure was repeated for any different channe configurations and the average bit error rate was so obtained. We have considered a syste with processing gain G18 copex chips/bit, and the resuts are shown in Fig.. It shoud be noticed that there are ony 3 orthogona codes avaiabe in order to expoit the ow coding rate, but ore users can be supported if each group of orthogona users transits with a different scrabing code. We have used a 6-path Rayeigh faded ode with exponentia decay and 100ns rs-deay, and have considered E b /N 0 9dB. It can be seen that a substantia capacity gain can be obtained by using the pre-rake, which confirs the resuts fro [], in which however coding was not considered. We aso notice that ony a argina gain can be obtained by epoying orthogona codes in association with a pre-rake. he capacity gain is due to the fact that with a pre-rake the desired signa is received coherenty, whie the interfering signas are not, whereas with a Rake receiver both desired and interfering signas are received coherenty. Furtherore, the sei-anaytica resuts show a great accordance with the ones obtained through siuation. We saw in the previous section that a perforance iproveent can be obtained with a pre-rake, but it has a ajor drawback. Its perforance is severey deteriorated in the presence of rapidy changing channes, since the transission in the downink reies on channe easureents obtained in the previous upink period. he anaysis of this behaviour is very difficut anayticay and it has to be faced with siuation. In the resuts presented here we have used the foowing paraeters: carrier frequency 5GHz, sybo rate 18,16Mbauds and a DD frae duration of 1.5s. Accounting for guard intervas, piot signa, and considering that the sae channe has to be used for both inks, we achieve a net data rate of 64kbps in each ink, with a processing gain of G18 copex chips/bit, as in Section. he coding, processing gain and channe ode are the sae fro Section, but this tie we consider a oving obie, with a cassica dopper spectru, at various veocities. he resuts are shown in Fig. 3, in which we see the rapid deterioration of the pre-rake perforance with increasing veocity. he perforance can be however significanty iproved if we try to predict the channe characteristics using an 10-tap Wiener fiter[8]. his requires tota knowedge of the tie correation of the fading process, and can be thus seen as a iit on the perforance to be obtained using a pre-rake. he resuts so obtained are aso shown in Fig. 3. he channe paraeters are obtained fro a piot sequence in the idde of each frae, and we have assued perfect channe estiation. For the case with no prediction, we assue that the channe paraeters used for the pre-rake are the ones obtained in the upink frae. We can see that when prediction is not used the BER rapidy deteriorates for veocities above 5/s, whereas with the predictor veocities up to 15/s can be supported, which is adequate for systes with sa ces. Fig. 3 - Syste perforance in a changing environent Fig. - Perforance of a pre-rake in coparison to a Rake receiver 3 - Pre-Rake in changing channes he sae can be observed when we consider the capacity. In Fig. 4 we show the siuation resuts for a variabe nuber of users with a constant veocity of 5/s. We see that the capacity obtained with the pre-rake without prediction can be ess than the one obtained with a Rake receiver, due to the pre-rake sensitivity to Dopper fading, as shown above, but we can aso see that this can be reverted when prediction is used, at east at ow veocities. On the downink capacity of DD CDMA systes using a pre-rake 4

6 C i d i are ineary independent. Hence this probe can be soved using Lagrange utipiers[9]. We have the foowing Lagrange function ( s) s s λ i s ( C i γ i ) (0) i 0 By differentiating the functions p(s) and c i (s) a point of oca iniu s * is obtained if F ( s) s λ i C i 0 (1) i 0 Fig. 4 - Capacity of the pre-rake in a changing environent,and the unique soution for that equation is ceary 1 s -- λ i C i λ i C i i 0 i 0 () 4 - Pre-Rake with instant power contro As we have seen, the basic idea behind the pre-rake is that in DD systes we can assue that the channe ipuse response is known before transission. Besides that, the data sequence is aso known, so that we are abe to find the optiu transission sequence at the base station that iniises the error probabiity at a atched fiter receiver at the obie station. In rea systes we want to obtain a certain quaity of service, and there is itte point in reducing the bit rate beyond the required. We want to increase capacity, and in CDMA systes this eans to reduce the interference, and hence the transitted power. his eans that the search for the optia transission sequence can aso be seen as the search for the sequence that iniises the transitted power for given receiver perforances. In QPS the perforance is basicay a function of the correation between the received signa without noise and the desired signa. Now suppose we transit the signa vector s[re[s(0)],i[s(0)],re[s(1)],...,re[s(-1)]i[s(-1)]]. he signa received at user i is distorted by the channe atrix C i such that the received signa equas r i C i s n i (18) where n i is the noise vector. Ignoring the noise vector, we want to obtain the vector s that iniises the transitted power p(s)s s, under the constraint that the correation requireents of every user is satisfied, i.e., such that c i ( s) r i s C i γ i (19) where d i is a vector containing the desired data, incuding channe coding, spreading and scrabing. We have a syste with N constraints, with N the nuber of users, and we assue that N is ess than the diension of s. Furtherore, the derivative p (s)s 0 for any s 0, and we can assue that Rank(c (s))n, which is true if the vectors his is however nothing ess than the pre-rake. It is thus deonstrated that the pre-rake is the optia transission technique in ters of signa correation for a atched fiter receiver. he paraeters λ i can be obtained by soving the N equations obtained by substituting equation () in (19), as foows: λ j d j C j C i γ i (3) j 0 Different users are differenty affected by channe ipairents and uti-user interference, and ay have different quaity criteria. hese factors can be copensated with knowedge of the vaues λ i, which provide inforation that can be used to obtain an instant power contro, i.e., power contro can be ade on a bit-by-bit basis in order to copensate for the fuctuations in the interference eve. We now et s(k) be the transitted sequence at the transission period of the k-th bit. As in (18), the received signa can be expressed by: r i C i s v i n i (4) where v i (k)c i s(k-1) is the interference due to the deayed versions of the signa transitted during the previous bit. Siiary to (3), the N equations to be soved are now: λ j ( k )d ( k ) C j j C i d ( i k ) γ i v i di j 0 (5) Now et B(k)[d 0 (k)c 0, d 1 (k)c 1,..., d N-1 (k)c N-1 ] and v(k)[v 0 (k)d 0 (k),v 1 (k)d 1 (k),..., v N-1 (k)d N-1 (k)], then the equations (5) can be expressed in the atrix for B B λ γ v (6) Since B(k)B (k) is a syetric positive definite atrix, this On the downink capacity of DD CDMA systes using a pre-rake 5

7 syste can be soved with reduced copexity by using Choesky[9] decoposition. It ust be said that this anaysis appies not ony to a bit period, but by any period of ength sybos such that N, when using QPS. Anyway, the saest period at which the signa correation atters is b R, where R is the coding rate. We have siuated a syste epoying the instant power contro just suggested, and copared it with the resuts obtained with a Rake receiver and with a pre-rake. We assue as requireent that a users have the sae signa correation at reception, and after obtaining the signa power that iniises the transit power, the power is noraised, so that the sae transit power is used for a techniques. he resuts can be seen in Fig. 5 for a syste with processing gain G3 copex chips/bit, no channe coding and a 4- path channe ode. We have aso assued perfect power contro for the Rake and pre-rake situations, i.e., the received power is constant and the sae for a users. We can see that the capacity obtained with the proposed instant power contro is uch higher than the ones with either the Rake receiver or the pre-rake. his capacity gain is obtained with no further copexity at the obie station, which, as with a pre-rake, needs just a atched fiter receiver. Furtherore, through this ethod we can ake sure that a the users are treated equay and receive their fair share of the transitter power resources. his ethod can be viewed as a sort of uti-user transission schee, in which the best transission signa is estiated taking into account the interference between the different users. E b /N 0 6dB E b /N 0 9dB Fig. 5 - Perforance of the pre-rake with instant power contro 5 - Concusion In this paper we have investigated the capacity cain that can be achieved in the downink of DD CDMA systes by using a pre-rake at the base station. It has been shown that besides aowing a siper obie station receiver design, systes using the pre-rake can provide a significant capacity increase in the downink. Nevertheess the pre-rake perforance is very susceptibe to the obie veocity, and we have shown that robust pre-rake transission is feasibe with the adequate channe prediction schee, and that a arge capacity can be achieved aso at high veocities. As entioned in the Introduction, power contro is a key issue aso in the downink, and we have shown that a substantia capacity gain can be obtained if we use the a priori channe knowedge inherent to DD to provide instant power contro in conjunction with the pre-rake. 6 - References [1] Esaizadeh R. and Nakagawa M., "Pre-Rake Diversity Cobination for Direct Sequence Spread Spectru Mobie Counications Systes", IEICE rans. on Co., Aug. 1993, pp [] Esaizadeh R.,Sourour E. and Nakagawa M., "Pre- Rake Diversity Cobining in ie Division Dupex CDMA Mobie Counications", Proc. of the Int Syp. on Persona, Indoor and Mobie Radio Co (PIMRC), oronto, Sep. 1995, pp [3] Dahan E.,Gudundson B.,Nisson M.,Skod J., "UMS/IM-000 Based on Wideband CDMA", IEEE Co. Mag., Sep. 1998, pp [4] Ojanpera.and Prasad R., "An Overview of Air Interface Mutipe Access for IM-000/UMS", IEEE Co. Mag., Sep. 1998, pp 8-95 [5] Yang J. and Rajan M., "Microce Perforance Evauation in IS-95 based CDMA Networks", Proc. of the Int Conf. on Universa Persona Co. (ICUPC), Forence, Oct. 1998, pp [6] Moshavi S., "Muti-User Detection for DS-CDMA Counications", IEEE Co. Mag., Oct. 1996, pp [7] Proakis, Digita Counications, McGraw Hi, New York, 1995 [8] Haykin, Adaptive Fiter heory, Prentice Ha, Engewood Ciffs, NJ, USA1991 [9] Zeider, eubner-aschenbuch der Matheatik, eubner, Leipzig, Gerany, 1996 On the downink capacity of DD CDMA systes using a pre-rake 6

CHAPTER 3 REDUCTION OF INTERCARRIER INTERFERENCE

CHAPTER 3 REDUCTION OF INTERCARRIER INTERFERENCE 46 CHAPTER 3 REDUCTIO OF ITERCARRIER ITERFERECE 3.1 ITERCARRIER ITERFERECE I OFDM SYSTEMS OFDM is a spectray efficient uticarrier oduation technique and it handes frequency seective channes we when cobined

More information

PILOT-ASSISTED ADAPTIVE CHANNEL ESTIMATION USING MULTIPLE SETS OF TAP WEIGHTS FOR COHERENT RAKE RECEPTION OF DS-CDMA SIGNALS

PILOT-ASSISTED ADAPTIVE CHANNEL ESTIMATION USING MULTIPLE SETS OF TAP WEIGHTS FOR COHERENT RAKE RECEPTION OF DS-CDMA SIGNALS PILO-ASSISED ADAPIVE CHAEL ESIMAIO USIG MULIPLE SES OF AP WEIGHS FOR COHERE RAKE RECEPIO OF DS-CDMA SIGALS Shinsuke akaoka an Fuiyuki Aachi Eectrica an Counication Engineering, Grauate Schoo of Engineering,

More information

Channel Division Multiple Access Based on High UWB Channel Temporal Resolution

Channel Division Multiple Access Based on High UWB Channel Temporal Resolution Channe Division Mutipe Access Based on High UWB Channe Tempora Resoution Rau L. de Lacerda Neto, Aawatif Menouni Hayar and Mérouane Debbah Institut Eurecom B.P. 93 694 Sophia-Antipois Cedex - France Emai:

More information

An orthogonal multi-beam based MIMO scheme. for multi-user wireless systems

An orthogonal multi-beam based MIMO scheme. for multi-user wireless systems An orthogonal ulti-bea based IO schee for ulti-user wireless systes Dong-chan Oh o and Yong-Hwan Lee School of Electrical Engineering and IC, Seoul ational University Kwana P.O. Box 34, Seoul, 151-600,

More information

Keywords Frequency-domain equalization, antenna diversity, multicode DS-CDMA, frequency-selective fading

Keywords Frequency-domain equalization, antenna diversity, multicode DS-CDMA, frequency-selective fading Joint Frequency-doain Equalization and Antenna Diversity Cobining for Orthogonal Multicode DS-CDMA Signal Transissions in A Frequency-selective Fading Channel Taeshi ITAGAKI *1 and Fuiyui ADACHI *2 Dept.

More information

RAKE Receiver. Tommi Heikkilä S Postgraduate Course in Radio Communications, Autumn II.

RAKE Receiver. Tommi Heikkilä S Postgraduate Course in Radio Communications, Autumn II. S-72333 Postgraduate Course in Radio Counications, Autun 2004 1 RAKE Receiver Toi Heikkilä toiheikkila@teliasoneraco Abstract RAKE receiver is used in CDMA-based (Code Division Multiple Access) systes

More information

MIMO Radar Transmit Beampattern Design with PAR Constraint in a Spectrally Crowded Environment

MIMO Radar Transmit Beampattern Design with PAR Constraint in a Spectrally Crowded Environment nternationa Conference on Coputer etwors and Counication Technoogy (CCT6) O Radar Transit Beapattern Design with PAR Constraint in a Spectray Crowded Environent Qing-in ZA*, Yu-xi WAG,* and Wei Science

More information

COMBINED FREQUENCY AND SPATIAL DOMAINS POWER DISTRIBUTION FOR MIMO-OFDM TRANSMISSION

COMBINED FREQUENCY AND SPATIAL DOMAINS POWER DISTRIBUTION FOR MIMO-OFDM TRANSMISSION The 8th nnual IEEE International Syposiu on Personal, Indoor and Mobile Radio Counications (PIMRC 07) COMINED FREQUENCY ND SPTIL DOMINS POWER DISTRIUTION FOR MIMO-OFDM TRNSMISSION Wladiir ocquet, Kazunori

More information

THE TRADEOFF BETWEEN DIVERSITY GAIN AND INTERFERENCE SUPPRESSION VIA BEAMFORMING IN

THE TRADEOFF BETWEEN DIVERSITY GAIN AND INTERFERENCE SUPPRESSION VIA BEAMFORMING IN THE TRADEOFF BETWEEN DIVERSITY GAIN AND INTERFERENCE SUPPRESSION VIA BEAMFORMING IN A CDMA SYSTEM Yan Zhang, Laurence B. Mistein, and Pau H. Siege Department of ECE, University of Caifornia, San Diego

More information

Application of Improved BP Neural Network in Controlling the Constant-Force Grinding Feed

Application of Improved BP Neural Network in Controlling the Constant-Force Grinding Feed Appication of Iproved BP Neura Networ in Controing the Constant-Force Grinding Feed Zhaoxia Chen, Baiin He, and Xianfeng Xu Key Laboratory of Ministry of Education for Conveyance and Equipent, East China

More information

A Specialized Software Package Useful In The Analysis Of The Harmonic Current Flow In Networks With Large Power Static Converters

A Specialized Software Package Useful In The Analysis Of The Harmonic Current Flow In Networks With Large Power Static Converters SEECE OPICS in MHEMIC MEHOS and COMPUION ECHNIQUES in EECRIC ENGINEERING Speciaized Software Package Usefu In he naysis Of he Haronic Current Fow In Networks With arge Power Static Converters VIORE VRVR,

More information

Appendix A Rolling Average Algorithm

Appendix A Rolling Average Algorithm Appendix A Roing Average Agorith 98 ROLLING AVERAGE ALGORITHM Let be a ink between two reader fied sites with aributes th, the ink threshod for ink,, the current roing average trave tie for ink, and s,

More information

Performance of Single User vs. Multiuser Modulation in Wireless Multicarrier (MC) Communications

Performance of Single User vs. Multiuser Modulation in Wireless Multicarrier (MC) Communications erformance of Singe User vs. Mutiuser Moduation in Wireess Muticarrier (MC) Communications Anwaru Azim, ecturer, East West University Bangadesh Abstract-- he main objective of this paper is to compare

More information

Research Article OFDM Link Performance Analysis under Various Receiver Impairments

Research Article OFDM Link Performance Analysis under Various Receiver Impairments Hindawi Pubishing Corporation EURASIP Journa on Wireess Counications and Networking Voue 8, Artice ID 79, pages doi:./8/79 Research Artice OFDM Link Perforance Anaysis under Various Receiver Ipairents

More information

Performance Measures of a UWB Multiple-Access System: DS/CDMA versus TH/PPM

Performance Measures of a UWB Multiple-Access System: DS/CDMA versus TH/PPM Performance Measures of a UWB Mutipe-Access System: DS/CDMA versus TH/PPM Aravind Kaias and John A. Gubner Dept. of Eectrica Engineering University of Wisconsin-Madison Madison, WI 53706 akaias@wisc.edu,

More information

Performance Analysis of an AMC System with an Iterative V-BLAST Decoding Algorithm

Performance Analysis of an AMC System with an Iterative V-BLAST Decoding Algorithm I. J. Counications, Network and Syste Sciences, 008,, 105-06 Published Online May 008 in SciRes (http://www.srpublishing.org/journal/ijcns/). Perforance Analysis of an AMC Syste with an Iterative V-BLAST

More information

Multicarrier Interleave-Division Multiple Access Communication in Multipath Channels

Multicarrier Interleave-Division Multiple Access Communication in Multipath Channels Multicarrier Interleave-Division Multiple Access Counication in Multipath Channels Habib ur Rehan *, Muhaad Naee **, Iran Zaa *, Syed Isail Shah ** * Center for Advanced Studies in Engineering (CASE) Islaabad

More information

Rate-Allocation Strategies for Closed-Loop MIMO-OFDM

Rate-Allocation Strategies for Closed-Loop MIMO-OFDM Rate-Aocation Strategies for Cosed-Loop MIMO-OFDM Joon Hyun Sung and John R. Barry Schoo of Eectrica and Computer Engineering Georgia Institute of Technoogy, Atanta, Georgia 30332 0250, USA Emai: {jhsung,barry}@ece.gatech.edu

More information

A soft decision decoding of product BCH and Reed-Müller codes for error control and peak-factor reduction in OFDM

A soft decision decoding of product BCH and Reed-Müller codes for error control and peak-factor reduction in OFDM A soft decision decoding of product BCH and Reed-Müller codes for error control and pea-factor reduction in OFDM Yves LOUET *, Annic LE GLAUNEC ** and Pierre LERAY ** * PhD Student and ** Professors, Departent

More information

SECURITY AND BER PERFORMANCE TRADE-OFF IN WIRELESS COMMUNICATION SYSTEMS APPLICATIONS

SECURITY AND BER PERFORMANCE TRADE-OFF IN WIRELESS COMMUNICATION SYSTEMS APPLICATIONS Latin Aerican Applied Research 39:187-192 (2009) SECURITY AND BER PERFORMANCE TRADE-OFF IN WIRELESS COMMUNICATION SYSTEMS APPLICATIONS L. ARNONE, C. GONZÁLEZ, C. GAYOSO, J. CASTIÑEIRA MOREIRA and M. LIBERATORI

More information

Cell Coverage Optimization for the Multicell Massive MIMO Uplink

Cell Coverage Optimization for the Multicell Massive MIMO Uplink Ce Coverage Optiization for the Mutice Massive MIMO Upink Jin, S., Wang, J., Sun, Q., Matthaiou, M., & Gao, X. 04. Ce Coverage Optiization for the Mutice Massive MIMO Upink. IEEE Transactions on Vehicuar

More information

Bispectrum of Stator Phase Current for Fault Detection of Induction Motor

Bispectrum of Stator Phase Current for Fault Detection of Induction Motor ispectru of Stator Phase Current for Faut Detection of Induction Motor Juggrapong Treetrong, Jyoti K. Sinha* Schoo of Mechanica, Aerospace and Civi Engineering, The University of Manchester, Seckvie Street,

More information

Satellite Link Layer Performance Using Two Copy SR-ARQ and Its Impact on TCP Traffic

Satellite Link Layer Performance Using Two Copy SR-ARQ and Its Impact on TCP Traffic Sateite Link Layer Performance Using Two Copy SR-ARQ and Its Impact on TCP Traffic Jing Zhu and Sumit Roy Department of Eectrica Engineering, University of Washington Box 352500, Seatte, WA 98195, USA

More information

Effect of Estimation Error on Adaptive L-MRC Receiver over Nakagami-m Fading Channels

Effect of Estimation Error on Adaptive L-MRC Receiver over Nakagami-m Fading Channels Internationa Journa of Appied Engineering Research ISSN 973-456 Voume 3, Number 5 (8) pp. 77-83 Research India Pubications. http://www.ripubication.com Effect of Estimation Error on Adaptive -MRC Receiver

More information

A Low Complexity VCS Method for PAPR Reduction in Multicarrier Code Division Multiple Access

A Low Complexity VCS Method for PAPR Reduction in Multicarrier Code Division Multiple Access 0 JOURNAL OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA, VOL. 5, NO., JUNE 007 A Low Compexity VCS Method for PAPR Reduction in Muticarrier Code Division Mutipe Access Si-Si Liu, Yue iao, Qing-Song Wen,

More information

Kalman Filtering for NLOS Mitigation and Target Tracking in Indoor Wireless Environment

Kalman Filtering for NLOS Mitigation and Target Tracking in Indoor Wireless Environment 16 Kalan Filtering for NLOS Mitigation and Target Tracking in Indoor Wireless Environent Chin-Der Wann National Sun Yat-Sen University Taiwan 1. Introduction Kalan filter and its nonlinear extension, extended

More information

Wireless Communications

Wireless Communications Wireess Communications Ceuar Concept Hamid Bahrami Reference: Rappaport Chap3 Eectrica & Computer Engineering Statements of Probems Soving the probem of Spectra congestion System Capacity A system-eve

More information

LETTER Adaptive Multi-Stage Parallel Interference Cancellation Receiver for Multi-Rate DS-CDMA System

LETTER Adaptive Multi-Stage Parallel Interference Cancellation Receiver for Multi-Rate DS-CDMA System IEICE TRANS. COMMUN., VOL.E87 B, NO.8 AUGUST 2004 2401 LETTER Adaptive Multi-Stage Parallel Interference Cancellation Receiver for Multi-Rate DS-CDMA Syste Seung Hee HAN a), Student Meber and Jae Hong

More information

Relation between C/N Ratio and S/N Ratio

Relation between C/N Ratio and S/N Ratio Relation between C/N Ratio and S/N Ratio In our discussion in the past few lectures, we have coputed the C/N ratio of the received signals at different points of the satellite transission syste. The C/N

More information

Adaptive Harmonic IIR Notch Filter with Varying Notch Bandwidth and Convergence Factor

Adaptive Harmonic IIR Notch Filter with Varying Notch Bandwidth and Convergence Factor Journal of Counication and Coputer (4 484-49 doi:.765/548-779/4.6. D DAVID PUBLISHING Adaptive Haronic IIR Notch Filter with Varying Notch Bandwidth and Convergence Factor Li Tan, Jean Jiang, and Liango

More information

Application of Control Theory to a Commercial Mobile Service Support System

Application of Control Theory to a Commercial Mobile Service Support System Appication of Contro Theory to a Coercia Mobie Service Support Syste Aani, Paya; Aspernäs, Berti; Åströ, Kar Johan; Derantz, Manfred; Kih, Maria; Radu, Gabriea; Robertsson, Anders; Torstensson, Andreas

More information

Rateless Codes for the Gaussian Multiple Access Channel

Rateless Codes for the Gaussian Multiple Access Channel Rateess Codes for the Gaussian Mutipe Access Channe Urs Niesen Emai: uniesen@mitedu Uri Erez Dept EE, Te Aviv University Te Aviv, Israe Emai: uri@engtauaci Devavrat Shah Emai: devavrat@mitedu Gregory W

More information

Outage Probability of Alamouti based Cooperative Communications with Multiple Relay Nodes using Network Coding

Outage Probability of Alamouti based Cooperative Communications with Multiple Relay Nodes using Network Coding Outage Probability of Alaouti based Cooperative Counications with Multiple Relay Nodes using Network Coding Gordhan Das Menghwar and Christoph F. Mecklenbräuker 2 Inforation Technology Centre Sindh Agriculture

More information

Overlapped frequency-time division multiplexing

Overlapped frequency-time division multiplexing April 29, 16(2): 8 13 www.sciencedirect.co/science/journal/158885 he Journal of China Universities of Posts and elecounications www.buptjournal.cn/xben Overlapped frequency-tie division ultiplexing JIANG

More information

Modeling Beam forming in Circular Antenna Array with Directional Emitters

Modeling Beam forming in Circular Antenna Array with Directional Emitters International Journal of Research in Engineering and Science (IJRES) ISSN (Online): 2320-9364, ISSN (Print): 2320-9356 Volue 5 Issue 3 ǁ Mar. 2017 ǁ PP.01-05 Modeling Bea foring in Circular Antenna Array

More information

DSI3 Sensor to Master Current Threshold Adaptation for Pattern Recognition

DSI3 Sensor to Master Current Threshold Adaptation for Pattern Recognition International Journal of Signal Processing Systes Vol., No. Deceber 03 DSI3 Sensor to Master Current Threshold Adaptation for Pattern Recognition David Levy Infineon Austria AG, Autootive Power Train Systes,

More information

The Estimation Methodology of the 2011 National Household Survey

The Estimation Methodology of the 2011 National Household Survey The Estiation Methodoogy of the 2011 Nationa Househod Survey François Verret Statistics Canada, 100 Tunney s Pasture Driveway, Ottawa, Ontario, Canada, K1A 0T6 Abstract Prior to 2011, the Canadian census

More information

Energy-Efficient Scheduling and Power Allocation in Downlink OFDMA Networks with Base Station Coordination

Energy-Efficient Scheduling and Power Allocation in Downlink OFDMA Networks with Base Station Coordination 1 Energy-Efficient Scheduing and Power Aocation in Downink OFDMA Networks with Base Station Coordination Luca Venturino, Meber, IEEE, Aessio Zappone, Meber, IEEE, Chiara Risi, and Stefano Buzzi, Senior

More information

On the Relationship Between Queuing Delay and Spatial Degrees of Freedom in a MIMO Multiple Access Channel

On the Relationship Between Queuing Delay and Spatial Degrees of Freedom in a MIMO Multiple Access Channel On the Reationship Between Queuing Deay and Spatia Degrees of Freedom in a IO utipe Access Channe Sriram N. Kizhakkemadam, Dinesh Rajan, andyam Srinath Dept. of Eectrica Engineering Southern ethodist University

More information

ELEC2202 Communications Engineering Laboratory Frequency Modulation (FM)

ELEC2202 Communications Engineering Laboratory Frequency Modulation (FM) ELEC Counications Engineering Laboratory ---- Frequency Modulation (FM) 1. Objectives On copletion of this laboratory you will be failiar with: Frequency odulators (FM), Modulation index, Bandwidth, FM

More information

Improving the Active Power Filter Performance with a Prediction Based Reference Generation

Improving the Active Power Filter Performance with a Prediction Based Reference Generation Improving the Active Power Fiter Performance with a Prediction Based Reference Generation M. Routimo, M. Sao and H. Tuusa Abstract In this paper a current reference generation method for a votage source

More information

Communication Systems

Communication Systems Communication Systems 1. A basic communication system consists of (1) receiver () information source (3) user of information (4) transmitter (5) channe Choose the correct sequence in which these are arranged

More information

Secure Physical Layer Key Generation Schemes: Performance and Information Theoretic Limits

Secure Physical Layer Key Generation Schemes: Performance and Information Theoretic Limits Secure Physica Layer Key Generation Schemes: Performance and Information Theoretic Limits Jon Waace Schoo of Engineering and Science Jacobs University Bremen, Campus Ring, 879 Bremen, Germany Phone: +9

More information

Using Adaptive Modulation in a LEO Satellite Communication System

Using Adaptive Modulation in a LEO Satellite Communication System Proceedings of the 11th WSEAS International Conference on COMMUNICATIONS, Agios Nikolaos, Crete Island, Greece, July 26-28, 27 255 Using Adaptive Modulation in a LEO Satellite Counication Syste L. HADJ

More information

Streaming Scalable Videos over Multi-Hop Cognitive Radio Networks

Streaming Scalable Videos over Multi-Hop Cognitive Radio Networks IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 9, NO. 11, NOVEMBER 2010 3501 Streaing Scaabe Videos over Muti-Hop Cognitive Radio Networks Dongin Hu and Shiwen Mao, Senior Meber, IEEE Abstract We investigate

More information

A Novel Method for Doppler and DOD- DOA Jointly Estimation Based on FRFT in Bistatic MIMO Radar System

A Novel Method for Doppler and DOD- DOA Jointly Estimation Based on FRFT in Bistatic MIMO Radar System 7 Asia-Pacific Engineering and Technoogy Conference (APETC 7) ISBN: 978--6595-443- A Nove Method for Dopper and DOD- DOA Jointy Estimation Based on FRFT in Bistatic MIMO Radar System Derui Song, Li Li,

More information

Analyzing Uplink SINR and Rate in Massive. MIMO Systems Using Stochastic Geometry

Analyzing Uplink SINR and Rate in Massive. MIMO Systems Using Stochastic Geometry Anayzing Upink SINR and Rate in Massive MIMO Systems Using Stochastic Geometry Tianyang Bai and Robert W. Heath, Jr. arxiv:5.2538v2 [cs.it] 2 Apr 26 Abstract This paper proposes a stochastic geometry framework

More information

A Novel NLOS Mitigation Approach for Wireless Positioning System

A Novel NLOS Mitigation Approach for Wireless Positioning System 2 3rd International Conference on Coputer and Electrical Engineering (ICCEE 2) IPCSIT vol. 53 (22) (22) IACSIT Press, Singapore DOI:.7763/IPCSIT.22.V53.No..54 A Novel NLOS Mitigation Approach for Wireless

More information

ADAPTIVE ITERATION SCHEME OF TURBO CODE USING HYSTERESIS CONTROL

ADAPTIVE ITERATION SCHEME OF TURBO CODE USING HYSTERESIS CONTROL ADATIV ITRATION SCHM OF TURBO COD USING HYSTRSIS CONTROL Chih-Hao WU, Kenichi ITO, Yung-Liang HUANG, Takuro SATO Received October 9, 4 Turbo code, because of its remarkabe coding performance, wi be popuar

More information

Copyright 2000 IEEE. IEEE Global Communications Conference (Globecom 2000), November 27 - December 1, 2000, San Francisco, California, USA

Copyright 2000 IEEE. IEEE Global Communications Conference (Globecom 2000), November 27 - December 1, 2000, San Francisco, California, USA Copyright 2000 EEE. EEE Goba Communications Conference (Gobecom 2000), November 27 - December 1, 2000, San Francisco, Caifornia, USA Persona use of this materia is permitted. owever, permission to reprint/repubish

More information

Introduction Traditionally, studying outage or cellular systes has been based on the signal-to-intererence ratio (SIR) dropping below a required thres

Introduction Traditionally, studying outage or cellular systes has been based on the signal-to-intererence ratio (SIR) dropping below a required thres Miniu Duration Outages in Rayleigh Fading Channels Jie Lai and Narayan B. Mandaya WINLAB, Rutgers University 73 Brett Rd., Piscataway, NJ 8854-86 Eail: jlai@winlab.rutgers.edu, narayan@winlab.rutgers.edu

More information

Energy-Efficient Cellular Communications Powered by Smart Grid Technology

Energy-Efficient Cellular Communications Powered by Smart Grid Technology Energy-Efficient Cellular Counications Powered by Sart Grid Technology Itiaz Nasi, Mostafa Zaan Chowdhury, and Md. Syadus Sefat Departent of Electrical and Electronic Engineering Khulna University of Engineering

More information

Transmit Power and Bit Allocations for OFDM Systems in a Fading Channel

Transmit Power and Bit Allocations for OFDM Systems in a Fading Channel Transit Power and Bit Allocations for OFD Systes in a Fading Channel Jiho Jang *, Kwang Bok Lee, and Yong-Hwan Lee * Sasung Electronics Co. Ltd., Suwon P.O.Box, Suwon-si, Gyeonggi-do 44-74, Korea School

More information

The PAPR and Simple PAPR Reduction of the 2D Spreading Based Communication Systems

The PAPR and Simple PAPR Reduction of the 2D Spreading Based Communication Systems RADIOENGINEERING, VOL. 9, NO., APRIL 7 The PAPR and Siple PAPR Reduction of the D Spreading Based Counication Systes Jiří BLUMENSTEIN, Zbyněk FEDRA Dept. of Radio Electronics, Brno University of Technology,

More information

Efficient Resource Allocation Algorithm with Rate Requirement Consideration in Multicarrier-Based Cognitive Radio Networks

Efficient Resource Allocation Algorithm with Rate Requirement Consideration in Multicarrier-Based Cognitive Radio Networks Journa of Counications Vo. 0 No. January 05 Efficient Resource Aocation Agori wi Rate Requireent Consideration in uticarrier-based Cognitive Radio Networs Ling Zuang Lu Liu ai Sao Guangyu Wang and ai Wang

More information

Dealing with Link Blockage in mmwave Networks: D2D Relaying or Multi-beam Reflection?

Dealing with Link Blockage in mmwave Networks: D2D Relaying or Multi-beam Reflection? Deaing with Lin Bocage in mmwave etwors: DD Reaying or Muti-beam Refection? Mingjie Feng, Shiwen Mao Dept. Eectrica & Computer Engineering Auburn University, Auburn, AL 36849-5, U.S.A. Tao Jiang Schoo

More information

BER Performance Analysis of Cognitive Radio Physical Layer over Rayleigh fading Channel

BER Performance Analysis of Cognitive Radio Physical Layer over Rayleigh fading Channel Internationa Journa of Computer ppications (0975 8887) Voume 5 No.11, Juy 011 BER Performance naysis of Cognitive Radio Physica Layer over Rayeigh fading mandeep Kaur Virk Dr. B R mbedkar Nationa Institute

More information

COMPARATIVE ANALYSIS OF ULTRA WIDEBAND (UWB) IEEE A CHANNEL MODELS FOR nlos PROPAGATION ENVIRONMENTS

COMPARATIVE ANALYSIS OF ULTRA WIDEBAND (UWB) IEEE A CHANNEL MODELS FOR nlos PROPAGATION ENVIRONMENTS COMPARATIVE ANALYSIS OF ULTRA WIDEBAND (UWB) IEEE80.15.3A CHANNEL MODELS FOR nlos PROPAGATION ENVIRONMENTS Ms. Jina H. She PG Student C.C.E.T, Wadhwan, Gujarat, Jina_hshet@yahoo.com Dr. K. H. Wandra Director

More information

Precise Indoor Localization System For a Mobile Robot Using Auto Calibration Algorithm

Precise Indoor Localization System For a Mobile Robot Using Auto Calibration Algorithm Precise Indoor Localization Syste For a Mobile Robot Using Auto Calibration Algorith Sung-Bu Ki, JangMyung Lee, and I.O. Lee : Pusan National University, http://robotics.ee.pusan.ac.r, : Ninety syste Abstract:

More information

Interference Management in LTE Femtocell Systems Using Fractional Frequency Reuse

Interference Management in LTE Femtocell Systems Using Fractional Frequency Reuse Interference Manageent in LTE Fetocell Systes Using Fractional Frequency Reuse Poongup Lee and Jitae Shin School of Inforation and Counication Engineering Sungyunwan University, Suwon, 440-746, Korea {poongup,

More information

Simplified Analysis and Design of MIMO Ad Hoc Networks

Simplified Analysis and Design of MIMO Ad Hoc Networks Siplified Analysis and Design of MIMO Ad Hoc Networks Sunil Srinivasa and Martin Haenggi Departent of Electrical Engineering University of Notre Dae Notre Dae, IN 46556, USA Eail: {ssriniv, haenggi}@nd.edu

More information

New Characteristics Analysis Considering Transmission Distance and Load Variation in Wireless Power Transfer via Magnetic Resonant Coupling

New Characteristics Analysis Considering Transmission Distance and Load Variation in Wireless Power Transfer via Magnetic Resonant Coupling New Characteristics nalysis Considering Transission Distance and oad Variation in Wireless Power Transfer via Magnetic Resonant Coupling Masaki Kato, Takehiro ura, Yoichi Hori The Departent of dvanced

More information

Speech Enhancement using Temporal Masking and Fractional Bark Gammatone Filters

Speech Enhancement using Temporal Masking and Fractional Bark Gammatone Filters PAGE 420 Speech Enhanceent using Teporal Masking and Fractional Bark Gaatone Filters Teddy Surya Gunawan, Eliathaby Abikairajah School of Electrical Engineering and Telecounications The University of New

More information

Channel Estimation for SC-FDE Systems Using Frequency Domain Multiplexed Pilots

Channel Estimation for SC-FDE Systems Using Frequency Domain Multiplexed Pilots Channe Estimation for SC-FDE Systems Using Frequency Domain utipexed Piots Chan-Tong am, David D. Faconer and Forence Danio-emoine BCWS, Careton Univ., Canada K1S 5B6 Emai: {amc, ddf, fdanio@sce.careton.ca

More information

Optimal Modulation Index of the Mach-Zehnder Modulator in a Coherent Optical OFDM System Employing Digital Predistortion

Optimal Modulation Index of the Mach-Zehnder Modulator in a Coherent Optical OFDM System Employing Digital Predistortion Optial Modulation Index of the Mach-Zehnder Modulator in a Coherent Optical OFDM yste Eploying Digital redistortion David Rörich, Xiaojie Wang, Michael Bernhard, Joachi peidel Universität tuttgart, Institut

More information

arxiv: v1 [cs.it] 22 Aug 2007

arxiv: v1 [cs.it] 22 Aug 2007 Voice Service Support in Mobie Ad Hoc Networks Hai Jiang, Ping Wang, H. Vincent Poor, and Weihua Zhuang Dept. of Eec. & Comp. Eng., University of Aberta, Canada, hai.jiang@ece.uaberta.ca Dept. of Eec.

More information

Performance Comparison of Cyclo-stationary Detectors with Matched Filter and Energy Detector M. SAI SINDHURI 1, S. SRI GOWRI 2

Performance Comparison of Cyclo-stationary Detectors with Matched Filter and Energy Detector M. SAI SINDHURI 1, S. SRI GOWRI 2 ISSN 319-8885 Vo.3,Issue.39 November-14, Pages:7859-7863 www.ijsetr.com Performance Comparison of Cyco-stationary Detectors with Matched Fiter and Energy Detector M. SAI SINDHURI 1, S. SRI GOWRI 1 PG Schoar,

More information

A New Localization and Tracking Algorithm for Wireless Sensor Networks Based on Internet of Things

A New Localization and Tracking Algorithm for Wireless Sensor Networks Based on Internet of Things Sensors & Transducers 203 by IFSA http://www.sensorsportal.co A New Localization and Tracking Algorith for Wireless Sensor Networks Based on Internet of Things, 2 Zhang Feng, Xue Hui-Feng, 2 Zhang Yong-Heng,

More information

CAPACITY OF UNDERWATER WIRELESS COMMUNICATION CHANNEL WITH DIFFERENT ACOUSTIC PROPAGATION LOSS MODELS

CAPACITY OF UNDERWATER WIRELESS COMMUNICATION CHANNEL WITH DIFFERENT ACOUSTIC PROPAGATION LOSS MODELS CAPACITY OF UNDERWATER WIRELESS COMMUNICATION CHANNEL WITH DIFFERENT ACOUSTIC PROPAGATION LOSS MODELS Susan Joshy and A.V. Babu, Department of Eectronics & Communication Engineering, Nationa Institute

More information

Secondary-side-only Simultaneous Power and Efficiency Control in Dynamic Wireless Power Transfer System

Secondary-side-only Simultaneous Power and Efficiency Control in Dynamic Wireless Power Transfer System 069060 Secondary-side-only Siultaneous Power and Efficiency Control in Dynaic Wireless Power Transfer Syste 6 Giorgio ovison ) Daita Kobayashi ) Takehiro Iura ) Yoichi Hori ) ) The University of Tokyo,

More information

Joint Optimal Power Allocation and Relay Selection with Spatial Diversity in Wireless Relay Networks

Joint Optimal Power Allocation and Relay Selection with Spatial Diversity in Wireless Relay Networks Proceedings of SDR'11-WInnComm-Europe, 22-24 Jun 2011 Joint Optima Power Aocation and Reay Seection with Spatia Diversity in Wireess Reay Networks Md Habibu Isam 1, Zbigniew Dziong 1, Kazem Sohraby 2,

More information

Information Theoretic Radar Waveform Design for Multiple Targets

Information Theoretic Radar Waveform Design for Multiple Targets 1 Information Theoretic Radar Waveform Design for Mutipe Targets Amir Leshem and Arye Nehorai Abstract In this paper we use information theoretic approach to design radar waveforms suitabe for simutaneousy

More information

Power-Based Direction-of-Arrival Estimation Using a Single Multi-Mode Antenna

Power-Based Direction-of-Arrival Estimation Using a Single Multi-Mode Antenna Power-Based Direction-of-Arriva Estiation Using a Singe Muti-Mode Antenna Robert Pöhann, Siwei Zhang, Thoas Jost, Arin Daann Geran Aerospace Center (DLR) Institute of Counications and Navigation Oberpfaffenhofen,

More information

Self-Interference Canceller for Full-Duplex Radio Relay Station Using Virtual Coupling Wave Paths

Self-Interference Canceller for Full-Duplex Radio Relay Station Using Virtual Coupling Wave Paths Sef-Interference Canceer for Fu-Dupex Radio Reay Station Using Virtua Couping Wave Paths Kazunori Hayashi Yasuo Fujishima Megumi Kaneko Hideaki Sakai Riichi Kudo and Tomoki Murakami Graduate Schoo of Informatics,

More information

University of Bristol - Explore Bristol Research. Peer reviewed version. Link to published version (if available): /GLOCOM.2003.

University of Bristol - Explore Bristol Research. Peer reviewed version. Link to published version (if available): /GLOCOM.2003. Coon, J., Siew, J., Beach, MA., Nix, AR., Armour, SMD., & McGeehan, JP. (3). A comparison of MIMO-OFDM and MIMO-SCFDE in WLAN environments. In Goba Teecommunications Conference, 3 (Gobecom 3) (Vo. 6, pp.

More information

Analysis and Comparison of Time Replica and Time Linear Interpolation for Pilot Aided Channel Estimation in OFDM Systems

Analysis and Comparison of Time Replica and Time Linear Interpolation for Pilot Aided Channel Estimation in OFDM Systems Int J Counications Networ and Syste Sciences 010 3 446-45 doi:10436/ijcns01035059 Published Online May 010 (http://wwwsciporg/journal/ijcns/) Analysis and Coparison of Tie eplica and Tie inear Interpolation

More information

Iterative Receiver Signal Processing for Joint Mitigation of Transmitter and Receiver Phase Noise in OFDM-Based Cognitive Radio Link

Iterative Receiver Signal Processing for Joint Mitigation of Transmitter and Receiver Phase Noise in OFDM-Based Cognitive Radio Link Iterative Receiver Signal Processing for Joint Mitigation of Transitter and Receiver Phase Noise in OFDM-Based Cognitive Radio Link Ville Syrjälä and Mikko Valkaa Departent of Counications Engineering

More information

PREDICTING SOUND LEVELS BEHIND BUILDINGS - HOW MANY REFLECTIONS SHOULD I USE? Apex Acoustics Ltd, Gateshead, UK

PREDICTING SOUND LEVELS BEHIND BUILDINGS - HOW MANY REFLECTIONS SHOULD I USE? Apex Acoustics Ltd, Gateshead, UK PREDICTING SOUND LEVELS BEHIND BUILDINGS - HOW MANY REFLECTIONS SHOULD I USE? W Wei A Cooke J Havie-Clark Apex Acoustics Ltd, Gateshead, UK Apex Acoustics Ltd, Gateshead, UK Apex Acoustics Ltd, Gateshead,

More information

Utility-Proportional Fairness in Wireless Networks

Utility-Proportional Fairness in Wireless Networks IEEE rd Internationa Symposium on Persona, Indoor and Mobie Radio Communications - (PIMRC) Utiity-Proportiona Fairness in Wireess Networks G. Tychogiorgos, A. Gkeias and K. K. Leung Eectrica and Eectronic

More information

A Novel TDS-FDMA Scheme for Multi-User Uplink Scenarios

A Novel TDS-FDMA Scheme for Multi-User Uplink Scenarios A Novel TDS-FDMA Schee for Multi-User Uplink Scenarios Linglong Dai, Zhaocheng Wang, Jun Wang, and Zhixing Yang Tsinghua National Laboratory for Inforation Science and Technology, Electronics Engineering

More information

EQUALIZED ALGORITHM FOR A TRUCK CABIN ACTIVE NOISE CONTROL SYSTEM

EQUALIZED ALGORITHM FOR A TRUCK CABIN ACTIVE NOISE CONTROL SYSTEM EQUALIZED ALGORITHM FOR A TRUCK CABIN ACTIVE NOISE CONTROL SYSTEM Guangrong Zou, Maro Antila, Antti Lanila and Jari Kataja Sart Machines, VTT Technical Research Centre of Finland P.O. Box 00, FI-0 Tapere,

More information

Phase Noise Modelling and Mitigation Techniques in OFDM Communications Systems

Phase Noise Modelling and Mitigation Techniques in OFDM Communications Systems Phase Noise Modelling and Mitigation Techniques in OFDM Counications Systes Ville Syrjälä, Mikko Valkaa, Nikolay N. Tchaov, and Jukka Rinne Tapere University of Technology Departent of Counications Engineering

More information

Airborne Ultrasonic Position and Velocity Measurement Using Two Cycles of Linear-Period-Modulated Signal

Airborne Ultrasonic Position and Velocity Measurement Using Two Cycles of Linear-Period-Modulated Signal Airborne Utrasonic Position and Veocity Measurement Using Two Cyces of Linear-Period-Moduated Signa Shinya Saito 1, Minoru Kuribayashi Kurosawa 1, Yuichiro Orino 1, and Shinnosuke Hirata 2 1 Department

More information

We are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists. International authors and editors

We are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists. International authors and editors We are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists 3,900 116,000 10M Open access books available International authors and editors Downloads Our authors

More information

TEMPORAL FAIRNESS ENHANCED SCHEDULING FOR COOPERATIVE RELAYING NETWORKS IN LOW MOBILITY FADING ENVIRONMENTS

TEMPORAL FAIRNESS ENHANCED SCHEDULING FOR COOPERATIVE RELAYING NETWORKS IN LOW MOBILITY FADING ENVIRONMENTS TEMPORAL FAIRNESS ENHANCED SCHEDULING FOR COOPERATIVE RELAYING NETWORKS IN LOW MOBILITY FADING ENVIRONMENTS Ingmar Hammerström, Jian Zhao, and Armin Wittneben Swiss Federa Institute of Technoogy (ETH)

More information

Performance Analysis of Atmospheric Field Conjugation Adaptive Arrays

Performance Analysis of Atmospheric Field Conjugation Adaptive Arrays Perforance Analysis of Atospheric Field Conjugation Adaptive Arrays Aniceto Belonte* a, Joseph M. Kahn b a Technical Univ. of Catalonia, Dept. of Signal Theory and Coun., 08034 Barcelona, Spain; b Stanford

More information

Radio Resource Management in a Coordinated Cellular Distributed Antenna System By Using Particle Swarm Optimization

Radio Resource Management in a Coordinated Cellular Distributed Antenna System By Using Particle Swarm Optimization Radio Resource Manageent in a Coordinated Cellular Distributed Antenna Syste By Using Particle Swar Optiization Oer Haliloglu (1), Cenk Toker (1), Gurhan Bulu (1), Hali Yanikoeroglu (2) (1) Departent of

More information

Performance Evaluation of UWB Sensor Network with Aloha Multiple Access Scheme

Performance Evaluation of UWB Sensor Network with Aloha Multiple Access Scheme 1 Perforance Evaluation of UWB Sensor Network with Aloha Multiple Access Schee Roeo Giuliano 1 and Franco Mazzenga 2 1 RadioLabs Consorzio Università Industria, Via del Politecnico 1, 00133, Roe, Italy,

More information

DIGITAL Communications

DIGITAL Communications DIGITAL Counications Contents Introduction to Counication Systes Analogue Modulation AM, DSBSC, SB, SSB, FM, PM, Narrow band FM, PLL Deodulators, and FLL Loops Sapling Systes Tie and Frequency Division

More information

Model Development for the Wideband Vehicle-to-vehicle 2.4 GHz Channel

Model Development for the Wideband Vehicle-to-vehicle 2.4 GHz Channel Model Developent for the Wideband Vehicle-to-vehicle.4 GHz Channel Guillero Acosta and Mary Ann Ingra School of ECE, Georgia Institute of Technology, Atlanta, GA 333-5, USA gte437k@ail.gatech.edu, ai@ece.gatech.edu

More information

CAN FD system design

CAN FD system design icc 215 CAN FD system design Dr. - Ing. M. Schreiner Daimer Research and Deveopment Abstract The objective of this paper is to give genera design rues for the physica ayer of CAN FD networks. As an introduction

More information

Effect of Interfering Users on the Modulation Order and Code Rate for UWB Impulse-Radio Bit-Interleaved Coded M-ary PPM

Effect of Interfering Users on the Modulation Order and Code Rate for UWB Impulse-Radio Bit-Interleaved Coded M-ary PPM Effect of Interfering Users on the Moduation Order and Code Rate for UWB Impuse-Radio Bit-Intereaved Coded M-ary PPM Ruben Merz and Jean-Yves Le Boudec EPFL, Schoo of Computer and Communication Sciences

More information

Blind Multiuser Detection in Asynchronous DS-CDMA Systems over Nakagami-m Fading Channels

Blind Multiuser Detection in Asynchronous DS-CDMA Systems over Nakagami-m Fading Channels Bind Mutiuser Detection in Asynchronous DS-CDMA Systems over akagami-m Fading Channes Vinay Kumar Pamua JU Kakinada, Andhra Pradesh, India 533 003 pamuavk@yahoo.com ABSRAC his paper presents a technique

More information

Intermediate-Node Initiated Reservation (IIR): A New Signaling Scheme for Wavelength-Routed Networks with Sparse Conversion

Intermediate-Node Initiated Reservation (IIR): A New Signaling Scheme for Wavelength-Routed Networks with Sparse Conversion Interediate-Node Initiated Reservation IIR): A New Signaling Schee for Wavelength-Routed Networks with Sparse Conversion Kejie Lu, Jason P. Jue, Tiucin Ozugur, Gaoxi Xiao, and Irich Chlatac The Center

More information

Trajectory Control of a Variable Loaded Servo System by using Fuzzy Iterative Learning PID Control

Trajectory Control of a Variable Loaded Servo System by using Fuzzy Iterative Learning PID Control SCIREA Journa of Eectrics, Counication and Autoatic Contro http://www.scirea.org/journa/ecac Deceber 27, 2016 Voue 1, Issue 2, Deceber 2016 Trajectory Contro of a Variabe Loaded Servo Syste by using Fuzzy

More information

Optical fiber beamformer for processing two independent simultaneous RF beams

Optical fiber beamformer for processing two independent simultaneous RF beams Optical fiber beaforer for processing two independent siultaneous RF beas M. Jaeger, S. Granieri *, and A. Siahakoun Departent of Physics and Optical Engineering, Rose-Hulan Institute of Technology Terre

More information

EFFECTS OF MASKING ANGLE AND MULTIPATH ON GALILEO PERFORMANCES IN DIFFERENT ENVIRONMENTS

EFFECTS OF MASKING ANGLE AND MULTIPATH ON GALILEO PERFORMANCES IN DIFFERENT ENVIRONMENTS 1 EFFECTS OF MASKING ANGLE AND MULTIPATH ON GALILEO PERFORMANCES IN DIFFERENT ENVIRONMENTS M. Malicorne*, M. Bousquet**, V. Calettes*** SUPAERO, 1 avenue Edouard Belin BP 43, 3155 Toulouse Cedex, France.

More information

DIRECT MAPPING OVSF-BASED TRANSMISSION SCHEME FOR UNDERWATER ACOUSTIC MULTIMEDIA COMMUNICATION

DIRECT MAPPING OVSF-BASED TRANSMISSION SCHEME FOR UNDERWATER ACOUSTIC MULTIMEDIA COMMUNICATION Journal of Marine Science and Technology, Vol. 18, No. 3, pp. 413-418 (2010) 413 DIRECT MAPPING OVSF-BASED TRANSMISSION SCHEME FOR UNDERWATER ACOUSTIC MULTIMEDIA COMMUNICATION Chin-Feng Lin*, Jiang-Yao

More information

MOBILE OPTICAL WIRELESS SYSTEM FOR HEALTHCARE CONTINUOUS MONITORING USING IR TECHNOLOGY

MOBILE OPTICAL WIRELESS SYSTEM FOR HEALTHCARE CONTINUOUS MONITORING USING IR TECHNOLOGY 31 st August 015. Vol.78. No.3 005-015 JATIT & LLS. All rights reserved. ISSN: 199-8645 www.jatit.org E-ISSN: 1817-3195 MOBILE OPTICAL WIRELESS SYSTEM FOR HEALTHCARE CONTINUOUS MONITORING USING IR TECHNOLOGY

More information

FOR energy limited data networks, e.g., sensor networks,

FOR energy limited data networks, e.g., sensor networks, 578 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 8, NO., DECEMBER 009 An Optima Power Aocation Scheme for the STC Hybrid ARQ over Energy Limited Networks Hongbo Liu, Member, IEEE, Leonid Razoumov,

More information