MINIMUM OVERHEAD BURST SYNCHRONIZATION FOR OFDM BASED BROADBAND TRANSMISSION. Michael Speth, Dirk Daecke, Heinrich Meyr

Size: px
Start display at page:

Download "MINIMUM OVERHEAD BURST SYNCHRONIZATION FOR OFDM BASED BROADBAND TRANSMISSION. Michael Speth, Dirk Daecke, Heinrich Meyr"

Transcription

1 MINIMUM OVERHEAD BURST SYNCHRONIZATION FOR OFDM BASED BROADBAND TRANSMISSION Mchael Speth, Drk Daecke, Henrch Meyr Integrated Systems for Sgnal Processng (ISS) Aachen Unversty of Technology (RWTH) D Aachen, Germany ABSTRACT In ths paper the subject of tranng data overhead n burst orented transmsson systems usng OFDM s addressed. Prevous work has shown that burst synchronzaton for such scenaros s possble. Alas the tranng data needed n some cases wll sgnfcantly decrease the usable bandwdth. In order to mnmze overhead we analyze the mpact of synchronzaton errors on OFDM and derve a sutable optmzaton crteron. A novel tranng data format s ntroduced that allows to talor the overhead accordng to the actual requrements. Usng theoretcal analyss and smulaton the tranng data overhead can be decreased sgnfcantly wthout loss n performance. 1. INTRODUCTION OFDM (Orthogonal frequency dvson multplexng)s a well establshed technology for dgtal broadcastng applcatons [1]. Because of the numerous advantages of the OFDM prncple there s a growng nterest to use t for other applcatons [2, 3] as well. Some of the applcatons under consderaton such as wreless ATM requre a packet orented transmsson usng short data bursts [4]. OFDM s well known to be vulnerable to synchronzaton errors. Therefore the requrements for the accuracy of synchronzaton unts of the recever are extremely hgh. They are further aggravated by the partculartes of a burst orented transmsson: 1. The estmaton of all relevant parameters must be establshed by the evaluaton of a sngle preamble at a feasble complexty. 2. Whereas t s no bg topc n a contnuous transmsson, n a scenaro of very short bursts the tranng data needed for synchronzaton may reduce the usable bandwdth dramatcally. In the past several methods have been proposed that are capable to meet the requrements as far as accuracy and acquston tme are concerned [5, 6, 2, 7]. So far no Ths work was sponsored by the DFG under contract no. Me 651/14-1 partcular attenton has been pad to the synchronzaton overhead whch n some cases amounts to several OFDM symbols. It s obvous that for bursts consstng of few (possbly one) OFDM symbols ths overhead cannot be accepted. Therefore n ths artcle we show how the synchronzaton overhead can be systematcally reduced and adapted to the requrements of the applcaton. In order to quantfy the accuracy needed, we analyze the mpact of synchronzaton errors on the OFDM sgnal. A novel frame format s presented whch allows to talor the overhead used for synchronzaton accordng to these requrements. Further analyss of sutable algorthms shows how much tranng data s n fact requred. 2. SYSTEM MODEL 2.1. OFDM transmsson over selectve channels Data symbols a l k are transmtted va an OFDM system usng K u subcarrers. Let l be the OFDM symbol number and k be the number of the subcarrer. The resultng sgnal s descrbed by s(t) = + K u =2;1 l=; ;K u =2 a l k Ψ l k (t) (1) where Ψ l k (t) are the subcarrer pulses of length T s = T u +. Ψ l k (t) = e j2π Tu k (t; ;lts) u(t ; lt s ) u(t) = 1 0 t < Ts 0 else T u s the useful porton of the symbol whch s perodcally preceded by the guard nterval of length to compensate for nter symbol nterference (ISI). The transmtter s effcently mplemented usng an IFFT of sze N. The sgnal s transmtted over a frequency selectve channel h (t) δ(τ ; τ ) (3) h(τ t) = (2)

2 where h(τ t) comprses both the cr and the transmtter flter and has a maxmum dsperson of τ max. The receved sgnal sampled at tme nstants T = T u =N s gven by h (nt ) s(nt ; τ )+n(nt ) (4) r(n) = where n(nt ) denotes sampled whte Gaussan nose of varance σ N. We wll further assume that Efja l k j 2 g = Efjh j 2 g = 1 and the sgnal to nose rato averaged over all subcarrers s E s =N 1 0 = (5) σ N Takng all ths nto account the receved subcarrer symbols obtaned va the FFT are descrbed by z l k = a l k H l k + n l k (6) where n l k can be shown to be whte complex Gaussan nose and H l k = h (t)e 2πτ k Tu (7) 2.2. Transmsson Model and Recever Tasks Equaton (6) apples only under assumpton of deal synchronzaton of transmtter and recever. In general ths wll not be the case: The samplng tme T 0 of the recever wll be dfferent from T. The same holds for the carrer frequency leadng to a frequency devaton of f. In addton a symbol tmng offset of n ε T 0 has to be consdered. The resultng transmsson model comprsng all these effects s gven by [8, 5]: r(t n )=e j2π fnt h (nt 0 ) s((n ; n ε )T 0 ; τ )+n(nt 0 ) (8) In the recever the devatons have to be estmated and compensated to an extent where they have no nfluence on the BER. As man synchronzaton tasks symbol tmng synchronzaton, samplng clock synchronzaton and frequency synchronzaton can be dentfed. In order to determne the mportance of the sngle tasks, and to quantfy the accuracy needed, the mpact of synchronzaton errors on the OFDM sgnal must be analyzed. 3. IMPACT OF SYNCHRONIZATION ERRORS 3.1. Symbol Tmng Errors Identfyng the begnnng of an OFDM symbol and correctly removng the guard nterval s the frst task to be performed. The remanng N samples are fed nto the FFT for demodulaton. Due to the guard nterval some tmng offset can be tolerated as long as the samples wthn the FFT wndow are nfluenced by only one transmtted symbol. The subcarrer symbol dsturbed by an offset of n ε samples can be descrbed by [6]: nε j2πk z l k = e N ; n ε N N a l kh l k + n l k + n nε (l k) (9) where n ε (l k) can be assumed to be addtonal nose wth power P nε = jh (t)j 2 ; 2 ε 2 N ; ε (10) N and 8 < ε = : n ε ; τ T n ε T > τ τ ; T ; n ε 0 < n ε T < ;( ; τ ) 0 else Ths addtonal nose results from ISI and from nter channel nterference (ICI) caused by the loss of orthogonalty of the sgnal Frequency and Samplng Clock Errors A statc frequency offset f wll lead to a phase rotaton of the subcarrer symbols and to addtonal ICI. The receved symbols are descrbed by [9] z l k = e j2π fl(t s) a l k s(π ft u )H l k +n l k +n f (l k) (11) where n f (l k) can be assumed to be nose wth power P f π2 3 ( ft u) 2 (12) Takng nto account the typcal accuracy of oscllators frequency synchronzaton s mandatory for OFDM recevers.. Consderng a relatve samplng-clock offset of γ T 0 ; T = T the mpact on the receved subcarrer symbols s (13) Ts j2πkγl z l k = e Tu a l k s(πkγ)h l k + n l k + n γ (l k) (14) where n f (l k) agan s addtonal nose wth power P γ π2 3 (kγ)2 (15) Comparng these results to equatons (11) and (12) we see that the effects are comparable to those caused by a frequency offset f k = k γ ncreasng wth the subcarrer ndex k. In addton the symbol tmng poston wll change. Under wreless transmsson condtons P γ can usually be neglected. No explct samplng clock synchronzaton s needed.

3 4. REQUIREMENTS OF A BURST ORIENTED TRANSMISSION The ultmate requrement for the frame structure of a system (and the synchronzaton algorthms mpled by ths structure) s that the system performance should never be bounded by the achevable qualty of the synchronzaton. In order to systematcally mnmze the requred overhead we need to specfy an adequate crteron to measure the mpact of the synchronzaton on the system performance. From the analyss n the prevous secton we see that all synchronzaton errors bascally have two consequences: 1. A phase rotaton of the receved subchannel symbols. 2. Addtonal nose due to loss of sgnal power but more mportantly due to loss of orthogonalty. The phase rotatons cannot be dstngushed from those caused by the channel transfer functon. Hence they wll be compensated n the same way by ether a channel estmaton or by the use of a dfferental modulaton scheme. If we attrbute the synchronzaton effects to a resultng transfer functon Hl k R the followng modfed system model apples: z l k = a l k Hl k R + n l k + n s (l k) (16) where n s (l k) s the addtonal nose caused by all synchronzaton errors wth power P sync (m) =Efjn f j 2 g + Efjn γ j 2 g + Efjn nε j 2 g (17) and we assume that a synchronzaton parameter s held constant durng a burst wth burst number m. Thus the task of the recever s to reduce P sync (m) to an extent where ts mpact on decodng s neglgble. In a transmsson scenaro wth small bursts we can assume that the energy of the channel s constant for the duraton of one burst. If the power of the sgnal at the recever s held constant by a gan control the average power of the channel nose P C (m) wll change for every burst m and we defne: P C (m) =Efjn(l k)j 2 g (18) The synchronzaton effects are neglgble f the power of n s (l k) s sgnfcantly smaller than the power of the channel nose. Ths ntutve requrement can be expressed as follows: P sync (m) 1 K P C(m) (19) The mplct bound for the accuracy of the recever components gven by (19) s more approprate than the usual requrement that the synchronzaton error has to be wthn certan lmts. It mplctly takes nto account, that f the SNR of a specfc burst s too low for relably decodng the data, addtonal nose caused by synchronzaton errors may be qute large too. Thus the absolute devatons may be qute large wthout degradng the overall system performance. We defne a synchronzaton falure as the event that the lmt defned by (19) s exceeded: P f = P[P sync (m) > 1=K P C (m)] (20) The choce of K and P f depends on the modulaton and codng used and on the frame loss rate tolerable by the applcaton. Havng decded for specfc values the synchronzaton overhead can now be systematcally dmensoned. 5. FRAME FORMAT An effcent and relable burst synchronzaton requres the use of tranng data dedcated to synchronzaton [8] (For methods relyng solely on the evaluaton of the guardnterval as n [10, 11], correct synchronzaton cannot be guaranteed n the case of ISI). Generally ths tranng data can be provded n the frequency doman, embedded nto the subcarrer symbols, or n the tme doman as explct sequence. The sole use of frequency doman tranng data s problematc as far as the system acquston s concerned: Due to the lack of orthogonalty at the begnnng of the synchronzaton procedure the subcarrer symbols are subject to sever ICI. In order to acheve the necessary accuracy the synchronzaton must be performed teratvely whch contradcts the requrement of an nstantaneous acquston. Therefore ths opton wll not be treated any further. Apart from explct tranng data as guard nterval tranng sgnal T u n ε estmator wndow Fgure 1: Frame format for burst synchronzaton n [7, 12] perodc random data may be appled [6]. All these methods have n common that perodc sgnals are evaluated for synchronzaton. Most methods proposed use complete OFDM symbols as tranng data. Ths lmts the choce of the frame format and one may be forced to use much more overhead than actually requred. We therefore propose the frame format depcted n fgure 1 whch allows to freely choose the amount of symbol energy used for synchronzaton [13]. The frst symbol of

4 every burst s not only preceded by the guard nterval but also by an addtonal perodc part of L S samples (The remanng symbols of the burst are stll only preceded by the usual guard nterval). Thus we explot the perodcty nherent n every OFDM symbol and are able to effcently synchronze even bursts consstng of sngle symbols. L S can be chosen strctly accordng to the requrements of the system. For samplng-clock synchronzaton and the detecton of large frequency offsets addtonal tranng data can be nserted at subcarrer level [7]. 6. OPTIMIZATION OF THE FRAME STRUCTURE meet ths requrement can be derved va the tal probablty of a Gaussan dstrbuton wth varance σ ˆϕ : P[ϕ res > ϕ max ] ; 1 σ ϕ2 max ˆϕ 2σ p e 2ˆϕ (24) 2π ϕ max 1 ϕ 2 ; max 2 e 2σ 2ˆϕ (25) Usng (12) and (20) we can express the probablty for a synchronzaton falure as a functon of the synchronzaton overhead L S. Usng the approxmaton (25) we obtan: P f = e ; 6L S K (26) Note that equaton (26) s ndependent of both E s =N 0 We wll further regard the worst case of a burst consstng of a sngle OFDM symbol. As example we wll assume the transmsson of a broad-band sgnal of 8 Mhz bandwdth over a GSM hlly-terran channel as gven n [6] usng an OFDM system wth N = For the assumed accuracy of the samplng clock oscllators no synchronzaton of ths parameter s necessary even for hgh E s =N 0 of more than 20 db Frequency Synchronzaton A frequency offset can be dvded nto an offset of multples of the subcarrer spacng 1=T u and a fractonal offset of ϕ. f ϕ k ε = + (21) 2πT u T u The orthogonalty s only dsturbed by the fractonal offset ϕ. An nteger porton wll only lead to a shft of all subcarrers whch must be detected. Snce ths can be done relably wth only few addtonal synchronzaton symbols [6, 7, 5] we wll focus on the more crtcal task of estmatng the fractonal porton. An estmate for ϕ can be obtaned by averagng over the phase dfferences of the perodc portons of the sgnal [14, 11] L S ;1 ˆϕ = argf =0 r(n + + N) r (n + )g (22) Assumng that the estmate s Gaussan dstrbuted ts varance can easly be shown to be σ ˆϕ 1 N P E s =N 0 (23) Though n the strct sense ths result apples only for the AWGN channel t also proves to be accurate for frequency selectve channels. Snce the frequency offset can never be compensated completely, from equaton (12) we determne an allowable maxmum ϕ max for the resdng frequency offset ϕ res after correcton wth the estmate obtaned va equaton (22). The probablty that we fal to Fgure 2: Probablty of a falure of the frequency synchronzaton as functon of the synchronzaton overhead. and N. The accuracy of ths result can be seen n fgure 2 where we compare analyss wth a stochastc smulaton (The two theoretcal curves are due to the two approxmatons for the tal probablty). For flat fadng channels the smulaton results are well wthn the theoretcal bounds. For selectve channels the approxmatons necessary to obtan equaton (23) are too optmstc. Nevertheless the synchronzaton error stll has the property of beng ndependent of the SNR. One can draw the followng conclusons for the desgn of the frame structure: 1. By provdng a certan L S one can always guarantee a certan qualty of the frequency estmate ndependently of the momentary SNR. 2. Snce the choce of L S s ndependent of N there are no restrctons as far as the number of subcarrers s concerned Tmng-/Frame- Synchronzaton Snce at the begnnng of the synchronzaton procedure we have to assume the frequency offset to be unknown,

5 tmng synchronzaton va correlaton s the most feasble alternatve [14, 6, 7, 13]. The metrc used n [14] s gven by Λ(n t ) = L S ;1 jr(n t + + N)j 2 + jr(n t + )j 2 =0 L S ;1 =0 ;2 r(n t ++N)r (n t +) (27) From ths metrc the correct startng pont of the symbol can be estmated va mn(λ(n t )) ;! ˆn ε (28) n t The metrc gven n (27) has a fundamental advantage compared to the common correlaton metrc as gven n [7]. The sze of the correlaton wndow L S can be arbtrarly small whereas the correlaton metrc requres a large L S to average out the effects of random data. The error probablty for the symbol estmaton cannot be derved wth passable effort. For evaluaton we therefore rely on smulaton: In analogy to [13] for random channels, dstrbuted accordng to the channel profle under consderaton, the symbol offset s estmated usng the proposed algorthm. From the resdng offset after correcton wth the estmated value the addtonal nose s calculated usng (10) and the synchronzaton falure s determned accordng to (20). Fgure 4: Probablty of a falure of the symbol synchronzaton for an average SNR of 20dB. The accuracy of the synchronzaton cannot be ncreased beyond a certan lmt even f L S s further ncreased. For large values of L S t even decreases. The mnmum s reached for rather small values of L S. Thus for hgh SNR cases there may be a tradeoff between the qualty of frequency and symbol synchronzaton. The mechansm behnd ths behavor can be explaned wth a close analyss of the metrc and wll be subject of further publcatons. For many applcatons the achevable performance of the algorthm wll suffce. Alas for hgh synchronzaton requrements combned wth a low frame loss rate, symbol synchronzaton may turn out to be the system bottleneck. Ths may be resolved n several ways: Insertng multple tranng sequences and averagng over several metrcs. Ths of course wll conflct wth the concept of a sngle symbol burst The use of a pror nformaton about the channel. Fgure 3: Probablty of a falure of the symbol synchronzaton for an average SNR of 10dB. The results obtaned are qute dfferent from those of the frequency estmaton: The performance of the algorthm s no longer ndependent of the E S =N 0. A comparson of fgure 3 and 4 shows that though the absolute accuracy of the estmate wll be better for a hgh SNR the mpact on the receved sgnal s less for the low SNR case. Applyng more sophstcated (though more complex) methods for symbol synchronzaton [13, 15]. 7. RESULTS AND CONCLUSION For the applcaton example under consderaton we can conclude the followng: Snce a burst orented scenaro wll usually not be a hgh SNR scenaro we see that wth a choce of K = 10, L S 25 may already be suffcent. In ths case P f (m) wll be n the same order of magntude for both frequency and symbol synchronzaton at a low level of 10 ;6 (For the channels under consderaton one can expect the decodng of a burst to fal more frequently). Even f we consder the addtonal tranng data needed to

6 detect a shft of the subcarrers, we stll acheve a consderable reducton of synchronzaton overhead compared to [2, 7]. As far as the performance of the synchronzaton algorthms s concerned the followng was observed: 1. For frequency synchronzaton the probablty of a synchronzaton falure s ndependent of the E b =N 0 and thus of fadng effects. A certan qualty can always be guaranteed, f suffcent tranng data s provded. 2. The common correlaton based symbol synchronzaton scheme shows a bottomng of the performance f a too large number of samples are wthn the correlator wndow. For very large values of L S the performance wll even decrease. Ths mples that performance for some systems may be lmted by the accuracy of symbol synchronzaton. As long as the accuracy of the correlaton based tmng synchronzaton suffces the burst format presented here allows synchronzaton wth mnmum overhead. If hgher accuracy s needed ths can be acheved wth the use of of a sngle-carrer tranng sequence as proposed for frequency synchronzaton n [12]. Applyng the results of [15] these sequences can also be used for symbol synchronzaton enablng powerful and mplementatonally smple algorthms. The use of these algorthms s at the cost of an ncreased synchronzaton overhead snce the length of the synchronzaton sequence needed amounts to multples of the guard nterval. REFERENCES [1] ETSI, Dgtal broadcastng systems for televson, sound and data servces: DRAFT pr ETS , Mar [2] T. Keller and L. Hanzo, Orthogonal Frequency Dvson Multplex Synchronsaton Technques For Wreless Local Area Networks, n Proceedngs of the IEEE Internatonal Symposum on Personal, Indoor, and Moble Rado Communcatons, [3] V. Engels and H. Rohlng, Rado Access to an ATM Network Wth a TDD/TDMA-OFDM system, n Proceedngs of the IEEE Internatonal Conference on Vehcular Technology, [4] D. Petras and A. Hettch and A. Krämlng, Support of ATM servce classes n Wreless ATM, n ACTS Moble Communcaton Summt 1997, Aalborg,Denmark, Oct [5] M. Speth, S. Fechtel, G. Fock, and H. Meyr, Broadband Transmsson Usng OFDM: System Performance and Recever Complexty, n Internatonal Zürch Semnar on Broadband Communcatons, (Zurch), IEEE, Feb [6] F. Claßen, Systemkomponenten für ene terrestrsche dgtale moble Bretbandübertragung. Shaker Verlag, Aachen, Dssertaton at the RWTH-Aachen, ISBN [7] T.Schmdl and D. Cox, Robust Frequency and Tmng Synchronzaton for OFDM, IEEE Transactons on Communcatons, vol. 45, Dec [8] H. Meyr, M. Moeneclaey and S. Fechtel, Dgtal Communcaton Recevers: Synchronzaton and Channel Estmaton Algorthms. John Wley and Sons, New York, [9] F. Classen and H. Meyr, Frequency Synchronzaton Algorthms for OFDM Systems sutable for Communcatons over Frequency Selectve Fadng Channels, n Proceedngs of the IEEE Internatonal Conference on Vehcular Technology, (Stockholm, Sweden), pp , June [10] J. van de Beek, M. Sandell, M. Isaksson, and P. Börjesson, Low-Complex Frame Synchronzaton n OFDM Systems, n Proc. of the ICUPC, [11] F. Daffara and O. Adam, A Novel Carrer Recovery Technque for Orthogonal Multcarrer Systems, European Transactons on Telecommuncatons, vol. 8, July [12] U. Lambrette, M. Speth, and H. Meyr, OFDM Burst Frequency Synchronzaton based on sngle Carrer Tranng Data, IEEE Communcatons Letters, vol. 1, Mar [13] M. Speth, F. Classen, and H. Meyr, Frame synchronzaton of OFDM systems n frequency selectve fadng channels, n Proceedngs of the IEEE Internatonal Conference on Vehcular Technology, [14] P. Chevllat, D. Mawald, and G. Ungerboeck, Rapd tranng of a voceband data modem recever employng an equalzer wth fractonal T-spaced coeffcents, IEEE Transactons on Communcatons, vol. 35, pp , Sept [15] U. Lambrette, J. Horstmannshoff, and H. Meyr, Technques for frame synchronzaton on unknown frequency selectve channels, n Proceedngs of the IEEE Internatonal Conference on Vehcular Technology, May 1997.

Parameter Free Iterative Decoding Metrics for Non-Coherent Orthogonal Modulation

Parameter Free Iterative Decoding Metrics for Non-Coherent Orthogonal Modulation 1 Parameter Free Iteratve Decodng Metrcs for Non-Coherent Orthogonal Modulaton Albert Gullén Fàbregas and Alex Grant Abstract We study decoder metrcs suted for teratve decodng of non-coherently detected

More information

Revision of Lecture Twenty-One

Revision of Lecture Twenty-One Revson of Lecture Twenty-One FFT / IFFT most wdely found operatons n communcaton systems Important to know what are gong on nsde a FFT / IFFT algorthm Wth the ad of FFT / IFFT, ths lecture looks nto OFDM

More information

Multipath Propagation. Outline. What is OFDM? (OFDM) for Broadband Communications and. Orthogonal Frequency Division Multiplexing

Multipath Propagation. Outline. What is OFDM? (OFDM) for Broadband Communications and. Orthogonal Frequency Division Multiplexing Orthogonal Dvson Multplexng (OFDM) for Broadband Communcatons and Dgtal Audo Broadcastng (DAB) Klaus Wtrsal wtrsal@nw.tugraz.at VL: Dgtale Audotechnk, 21. März, 2002 What s OFDM? Modulaton technque Requres

More information

Calculation of the received voltage due to the radiation from multiple co-frequency sources

Calculation of the received voltage due to the radiation from multiple co-frequency sources Rec. ITU-R SM.1271-0 1 RECOMMENDATION ITU-R SM.1271-0 * EFFICIENT SPECTRUM UTILIZATION USING PROBABILISTIC METHODS Rec. ITU-R SM.1271 (1997) The ITU Radocommuncaton Assembly, consderng a) that communcatons

More information

A study of turbo codes for multilevel modulations in Gaussian and mobile channels

A study of turbo codes for multilevel modulations in Gaussian and mobile channels A study of turbo codes for multlevel modulatons n Gaussan and moble channels Lamne Sylla and Paul Forter (sylla, forter)@gel.ulaval.ca Department of Electrcal and Computer Engneerng Laval Unversty, Ste-Foy,

More information

Comparative Analysis of Reuse 1 and 3 in Cellular Network Based On SIR Distribution and Rate

Comparative Analysis of Reuse 1 and 3 in Cellular Network Based On SIR Distribution and Rate Comparatve Analyss of Reuse and 3 n ular Network Based On IR Dstrbuton and Rate Chandra Thapa M.Tech. II, DEC V College of Engneerng & Technology R.V.. Nagar, Chttoor-5727, A.P. Inda Emal: chandra2thapa@gmal.com

More information

The Application of Interpolation Algorithms in OFDM Channel Estimation

The Application of Interpolation Algorithms in OFDM Channel Estimation The Applcaton of Interpolaton Algorthms n OFDM Estmaton Xjun ZHANG 1,, Zhantng YUAN 1, 1 School of Electrcal and Informaton Engneerng, Lanzhou Unversty of Technology, Lanzhou, Gansu 730050, Chna School

More information

Performance Analysis of Multi User MIMO System with Block-Diagonalization Precoding Scheme

Performance Analysis of Multi User MIMO System with Block-Diagonalization Precoding Scheme Performance Analyss of Mult User MIMO System wth Block-Dagonalzaton Precodng Scheme Yoon Hyun m and Jn Young m, wanwoon Unversty, Department of Electroncs Convergence Engneerng, Wolgye-Dong, Nowon-Gu,

More information

Rejection of PSK Interference in DS-SS/PSK System Using Adaptive Transversal Filter with Conditional Response Recalculation

Rejection of PSK Interference in DS-SS/PSK System Using Adaptive Transversal Filter with Conditional Response Recalculation SERBIAN JOURNAL OF ELECTRICAL ENGINEERING Vol., No., November 23, 3-9 Rejecton of PSK Interference n DS-SS/PSK System Usng Adaptve Transversal Flter wth Condtonal Response Recalculaton Zorca Nkolć, Bojan

More information

Multicarrier Modulation

Multicarrier Modulation Multcarrer Modulaton Wha Sook Jeon Moble Computng & Communcatons Lab Contents Concept of multcarrer modulaton Data transmsson over multple carrers Multcarrer modulaton wth overlappng Chap. subchannels

More information

Novel Sampling Clock Offset Estimation for DVB-T OFDM

Novel Sampling Clock Offset Estimation for DVB-T OFDM Novel Samplng Cloc Offset Estmaton for DVB-T OFD Hou-Shn Chen Yumn Lee Graduate Insttute of Communcaton Eng. and Department of Electrcal Eng. Natonal Tawan Unversty Tape 67 Tawan Abstract Samplng cloc

More information

Symbol Synchronization at the BPSK-OFDM Receiver

Symbol Synchronization at the BPSK-OFDM Receiver Symbol Synchronzaton at the BPSK-OFDM Recever Cheng-Yng Yang, Gwo-Ruey Lee, Wen-Hu Kuan and Jyh-Horng Wen, 3 cyang@nfu.edu.tw Department of Computer Scence and Informaton Engneerng, atonal Formosa Unversty

More information

NATIONAL RADIO ASTRONOMY OBSERVATORY Green Bank, West Virginia SPECTRAL PROCESSOR MEMO NO. 25. MEMORANDUM February 13, 1985

NATIONAL RADIO ASTRONOMY OBSERVATORY Green Bank, West Virginia SPECTRAL PROCESSOR MEMO NO. 25. MEMORANDUM February 13, 1985 NATONAL RADO ASTRONOMY OBSERVATORY Green Bank, West Vrgna SPECTRAL PROCESSOR MEMO NO. 25 MEMORANDUM February 13, 1985 To: Spectral Processor Group From: R. Fsher Subj: Some Experments wth an nteger FFT

More information

THE USE OF CONVOLUTIONAL CODE FOR NARROWBAND INTERFERENCE SUPPRESSION IN OFDM-DVBT SYSTEM

THE USE OF CONVOLUTIONAL CODE FOR NARROWBAND INTERFERENCE SUPPRESSION IN OFDM-DVBT SYSTEM THE USE OF CONVOLUTIONAL CODE FOR NARROWBAND INTERFERENCE SUPPRESSION IN OFDM-DVBT SYSTEM Azura Abdullah, Muhammad Sobrun Jaml Jamal, Khazuran Abdullah, Ahmad Fadzl Ismal and An Lza Asnaw Department of

More information

A NOVEL PREAMBLE DESIGN FOR CHANNEL ESTIMATION IN MIMO- OFDM SYSTEMS RESULTING IN ENHANCED THROUGHPUT

A NOVEL PREAMBLE DESIGN FOR CHANNEL ESTIMATION IN MIMO- OFDM SYSTEMS RESULTING IN ENHANCED THROUGHPUT Volume 53, umber 3, 01 ACTA TECHICA APOCESIS Electroncs and Telecommuncatons A OVEL PREAMBLE DESIG FOR CHAEL ESTIMATIO I MIMO- OFDM SYSTEMS RESULTIG I EHACED THROUGHPUT Shakeel Salamat ULLAH atonal Unversty

More information

Analysis and Optimization of the Performance of OFDM on Frequency- Selective Time-Selective Fading Channels

Analysis and Optimization of the Performance of OFDM on Frequency- Selective Time-Selective Fading Channels Analyss and Optmzaton of the erformance of OFDM on Frequency- Selectve Tme-Selectve Fadng Channels Hed Steendam, Marc Moeneclaey Communcatons Engneerng Lab. Unversty of Ghent B-9 GET, BELGIUM Abstract

More information

On Timing Offset and Frequency Offset Estimation in LTE Uplink *

On Timing Offset and Frequency Offset Estimation in LTE Uplink * On mng Offset and Frequency Offset Estmaton n LE Uplnk * Juan Lu, Bn Wu, and Pngan L School of Informaton Engneerng, Wuhan Unversty of echnology, No.22 Luosh Road, Hongshan Dstrct,Wuhan, Hube, Chna, 430070

More information

Digital Transmission

Digital Transmission Dgtal Transmsson Most modern communcaton systems are dgtal, meanng that the transmtted normaton sgnal carres bts and symbols rather than an analog sgnal. The eect o C/N rato ncrease or decrease on dgtal

More information

Uncertainty in measurements of power and energy on power networks

Uncertainty in measurements of power and energy on power networks Uncertanty n measurements of power and energy on power networks E. Manov, N. Kolev Department of Measurement and Instrumentaton, Techncal Unversty Sofa, bul. Klment Ohrdsk No8, bl., 000 Sofa, Bulgara Tel./fax:

More information

STUDY ON LINK-LEVEL SIMULATION IN MULTI- CELL LTE DOWNLINK SYSTEM

STUDY ON LINK-LEVEL SIMULATION IN MULTI- CELL LTE DOWNLINK SYSTEM Proceedngs of IEEE IC-BMT0 TUDY O LIK-LEVEL IMULATIO I MULTI- CELL LTE DOWLIK YTEM Yang Zhang, Ruoyu Jn, Xn Zhang, Dacheng Yang Beng Unversty of Posts and Telecommuncatons, Beng 00876, Chna 05330@bupt.edu.cn

More information

NOVEL ITERATIVE TECHNIQUES FOR RADAR TARGET DISCRIMINATION

NOVEL ITERATIVE TECHNIQUES FOR RADAR TARGET DISCRIMINATION NOVEL ITERATIVE TECHNIQUES FOR RADAR TARGET DISCRIMINATION Phaneendra R.Venkata, Nathan A. Goodman Department of Electrcal and Computer Engneerng, Unversty of Arzona, 30 E. Speedway Blvd, Tucson, Arzona

More information

Space Time Equalization-space time codes System Model for STCM

Space Time Equalization-space time codes System Model for STCM Space Tme Eualzaton-space tme codes System Model for STCM The system under consderaton conssts of ST encoder, fadng channel model wth AWGN, two transmt antennas, one receve antenna, Vterb eualzer wth deal

More information

Adaptive Modulation for Multiple Antenna Channels

Adaptive Modulation for Multiple Antenna Channels Adaptve Modulaton for Multple Antenna Channels June Chul Roh and Bhaskar D. Rao Department of Electrcal and Computer Engneerng Unversty of Calforna, San Dego La Jolla, CA 993-7 E-mal: jroh@ece.ucsd.edu,

More information

The Performance Improvement of BASK System for Giga-Bit MODEM Using the Fuzzy System

The Performance Improvement of BASK System for Giga-Bit MODEM Using the Fuzzy System Int. J. Communcatons, Network and System Scences, 10, 3, 1-5 do:10.36/jcns.10.358 Publshed Onlne May 10 (http://www.scrp.org/journal/jcns/) The Performance Improvement of BASK System for Gga-Bt MODEM Usng

More information

Dynamic Optimization. Assignment 1. Sasanka Nagavalli January 29, 2013 Robotics Institute Carnegie Mellon University

Dynamic Optimization. Assignment 1. Sasanka Nagavalli January 29, 2013 Robotics Institute Carnegie Mellon University Dynamc Optmzaton Assgnment 1 Sasanka Nagavall snagaval@andrew.cmu.edu 16-745 January 29, 213 Robotcs Insttute Carnege Mellon Unversty Table of Contents 1. Problem and Approach... 1 2. Optmzaton wthout

More information

Index Terms Adaptive modulation, Adaptive FEC, Packet Error Rate, Performance.

Index Terms Adaptive modulation, Adaptive FEC, Packet Error Rate, Performance. ANALYTICAL COMPARISON OF THE PERFORMANCE OF ADAPTIVE MODULATION AND CODING IN WIRELESS NETWORK UNDER RAYLEIGH FADING 723 Sab Y.M. BANDIRI, Rafael M.S. BRAGA and Danlo H. SPADOTI Federal Unversty of Itajubá

More information

1 GSW Multipath Channel Models

1 GSW Multipath Channel Models In the general case, the moble rado channel s pretty unpleasant: there are a lot of echoes dstortng the receved sgnal, and the mpulse response keeps changng. Fortunately, there are some smplfyng assumptons

More information

High Speed ADC Sampling Transients

High Speed ADC Sampling Transients Hgh Speed ADC Samplng Transents Doug Stuetzle Hgh speed analog to dgtal converters (ADCs) are, at the analog sgnal nterface, track and hold devces. As such, they nclude samplng capactors and samplng swtches.

More information

PRACTICAL, COMPUTATION EFFICIENT HIGH-ORDER NEURAL NETWORK FOR ROTATION AND SHIFT INVARIANT PATTERN RECOGNITION. Evgeny Artyomov and Orly Yadid-Pecht

PRACTICAL, COMPUTATION EFFICIENT HIGH-ORDER NEURAL NETWORK FOR ROTATION AND SHIFT INVARIANT PATTERN RECOGNITION. Evgeny Artyomov and Orly Yadid-Pecht 68 Internatonal Journal "Informaton Theores & Applcatons" Vol.11 PRACTICAL, COMPUTATION EFFICIENT HIGH-ORDER NEURAL NETWORK FOR ROTATION AND SHIFT INVARIANT PATTERN RECOGNITION Evgeny Artyomov and Orly

More information

CELL SEARCH ROBUST TO INITIAL FREQUENCY OFFSET IN WCDMA SYSTEMS

CELL SEARCH ROBUST TO INITIAL FREQUENCY OFFSET IN WCDMA SYSTEMS CELL EARCH ROBUT TO INITIAL FREQUENCY OFFET IN WCDMA YTEM June Moon and Yong-Hwan Lee chool of Electrcal Engneerng eoul Natonal Unversty an 56-, hllmdong, Kwanak-Ku, 5-74, eoul, Korea ylee@snu.ac.kr Abstract

More information

antenna antenna (4.139)

antenna antenna (4.139) .6.6 The Lmts of Usable Input Levels for LNAs The sgnal voltage level delvered to the nput of an LNA from the antenna may vary n a very wde nterval, from very weak sgnals comparable to the nose level,

More information

A Spreading Sequence Allocation Procedure for MC-CDMA Transmission Systems

A Spreading Sequence Allocation Procedure for MC-CDMA Transmission Systems A Spreadng Sequence Allocaton Procedure for MC-CDMA Transmsson Systems Davd Motter, Damen Castelan Mtsubsh Electrc ITE 80, Avenue des Buttes de Coësmes, 35700 Rennes FRAE e-mal: {motter,castelan}@tcl.te.mee.com

More information

RESOURCE CONTROL FOR HYBRID CODE AND TIME DIVISION SCHEDULING

RESOURCE CONTROL FOR HYBRID CODE AND TIME DIVISION SCHEDULING RESOURCE CONTROL FOR HYBRID CODE AND TIME DIVISION SCHEDULING Vaslos A. Srs Insttute of Computer Scence (ICS), FORTH and Department of Computer Scence, Unversty of Crete P.O. Box 385, GR 7 Heraklon, Crete,

More information

An Efficient Method for PAPR Reduction of OFDM Signal with Low Complexity

An Efficient Method for PAPR Reduction of OFDM Signal with Low Complexity An Effcent Method for PAPR Reducton of OFDM Sgnal wth Low Complety Mahesh Ingle M.E. EXTC MGMCET,Kamothe Nav Mumba-41009 Sachn Nkalje M.E. EXTC MGMCET Kamothe Nav Mumba-41009 Savta Bhosale H.o.D.(EXTC)

More information

A New Ranging Method for OFDMA Systems

A New Ranging Method for OFDMA Systems where C (m) (l) = C(m) k,d (l) =1, and {A, A k,d > } are ampltude factors. Denote the -pont untary nverse fast Fourer transform (IFFT) of (m) and (m) k,d by x(m) and, respectvely. After cyclc prefx (CP)

More information

AN ADVANCED ALGORITHM FOR IMPROVING DVB-T COVERAGE IN SFN. V. Mignone, A. Morello, M. Visintin. RAI Research Centre, Italy ABSTRACT

AN ADVANCED ALGORITHM FOR IMPROVING DVB-T COVERAGE IN SFN. V. Mignone, A. Morello, M. Visintin. RAI Research Centre, Italy ABSTRACT AN ADVANCED ALGORITHM FOR IMPROVING DVB-T COVERAGE IN SFN V. Mgnone, A. Morello, M. Vsntn RAI Research Centre, Italy ABSTRACT The paper analyses the coverage achevable n sngle frequency networks (SFN)

More information

On Channel Estimation of OFDM-BPSK and -QPSK over Generalized Alpha-Mu Fading Distribution

On Channel Estimation of OFDM-BPSK and -QPSK over Generalized Alpha-Mu Fading Distribution Int. J. Communcatons, Network and System Scences, 010, 3, 380-384 do:10.436/jcns.010.34048 Publshed Onlne Aprl 010 (http://www.scrp.org/journal/jcns/) On Channel Estmaton of OFDM-BPSK and -QPSK over Generalzed

More information

Impact of Interference Model on Capacity in CDMA Cellular Networks. Robert Akl, D.Sc. Asad Parvez University of North Texas

Impact of Interference Model on Capacity in CDMA Cellular Networks. Robert Akl, D.Sc. Asad Parvez University of North Texas Impact of Interference Model on Capacty n CDMA Cellular Networks Robert Akl, D.Sc. Asad Parvez Unversty of North Texas Outlne Introducton to CDMA networks Average nterference model Actual nterference model

More information

Error Probability of RS Code Over Wireless Channel

Error Probability of RS Code Over Wireless Channel Internatonal Journal of Electroncs Engneerng, 3 (), 11, pp. 99 33 Serals Publcatons, ISS : 973-7383 Error Probablty of RS Code Over Wreless Channel Mohammad Aftab Alam Khan 1 & Mehwash Farooq 1 1 Department

More information

Spatial Multiplexing applied to Turbo Coded Multi-Carrier CDMA

Spatial Multiplexing applied to Turbo Coded Multi-Carrier CDMA Spatal Multplexng appled to Turbo Coded Mult-Carrer CDMA Vncent Le Nr, Marylne Hélard, Rodolphe Le Gouable To cte ths verson: Vncent Le Nr, Marylne Hélard, Rodolphe Le Gouable. Spatal Multplexng appled

More information

MTBF PREDICTION REPORT

MTBF PREDICTION REPORT MTBF PREDICTION REPORT PRODUCT NAME: BLE112-A-V2 Issued date: 01-23-2015 Rev:1.0 Copyrght@2015 Bluegga Technologes. All rghts reserved. 1 MTBF PREDICTION REPORT... 1 PRODUCT NAME: BLE112-A-V2... 1 1.0

More information

Performance and Analysis of CDM-FH-OFDMA for Broadband Wireless Systems

Performance and Analysis of CDM-FH-OFDMA for Broadband Wireless Systems Performance and Analyss of CDM-FH-OFDMA for Broadband Wreless Systems Kan Zheng, Lu Han, Janfeng Wang, and Wenbo Wang Wreless Sgnal Processng Lab, Bejng Unversty of Posts & Telecomms, Bejng, Chna zkan@buptneteducn

More information

High Speed, Low Power And Area Efficient Carry-Select Adder

High Speed, Low Power And Area Efficient Carry-Select Adder Internatonal Journal of Scence, Engneerng and Technology Research (IJSETR), Volume 5, Issue 3, March 2016 Hgh Speed, Low Power And Area Effcent Carry-Select Adder Nelant Harsh M.tech.VLSI Desgn Electroncs

More information

Exponential Effective SIR Metric for LTE Downlink

Exponential Effective SIR Metric for LTE Downlink Exponental Effectve SIR Metrc for LTE Downlnk Joan Olmos, Albert Serra, Slva Ruz, Maro García-Lozano, Davd Gonzalez Sgnal Theory and Communcatons Department Unverstat Poltècnca de Catalunya (UPC) Barcelona,

More information

Two-Stage Detector for SC-FDMA Transmission over MIMO ISI Channels

Two-Stage Detector for SC-FDMA Transmission over MIMO ISI Channels Two-Stage Detector for SC-FDMA Transmsson over MIMO ISI Channels Marcel Jar Eml Matúš Esther Pérez-Adeva Eckhard Ohlmer and Gerhard Fettwes Vodafone Char Moble Communcaton Systems Technsche Unverstät Dresden

More information

BER Performances of a Differential OFDM System in Fading Channels

BER Performances of a Differential OFDM System in Fading Channels Buletnul Ştnţfc al Unverstăţ "Poltehnca" dn Tmşoara era ELECTRONICĂ ş TELECOMUNICAŢII TRANACTION on ELECTRONIC and COMMUNICATION Tom 49(63), Fasccola, 4 BER Performances of a Dfferental OFDM ystem n Fadng

More information

Walsh Function Based Synthesis Method of PWM Pattern for Full-Bridge Inverter

Walsh Function Based Synthesis Method of PWM Pattern for Full-Bridge Inverter Walsh Functon Based Synthess Method of PWM Pattern for Full-Brdge Inverter Sej Kondo and Krt Choesa Nagaoka Unversty of Technology 63-, Kamtomoka-cho, Nagaoka 9-, JAPAN Fax: +8-58-7-95, Phone: +8-58-7-957

More information

AN IMPROVED BIT LOADING TECHNIQUE FOR ENHANCED ENERGY EFFICIENCY IN NEXT GENERATION VOICE/VIDEO APPLICATIONS

AN IMPROVED BIT LOADING TECHNIQUE FOR ENHANCED ENERGY EFFICIENCY IN NEXT GENERATION VOICE/VIDEO APPLICATIONS Journal of Engneerng Scence and Technology Vol., o. 4 (6) 476-495 School of Engneerng, Taylor s Unversty A IMPROVED BIT LOADIG TECHIQUE FOR EHACED EERGY EFFICIECY I EXT GEERATIO VOICE/VIDEO APPLICATIOS

More information

Using EM algorithm as a new method for Synchronization and channel estimation of MIMO-OFDM systems

Using EM algorithm as a new method for Synchronization and channel estimation of MIMO-OFDM systems IJCSI Internatonal Journal of Computer Scence Issues, Vol. 9, Issue 3, o 2, May 2012 ISS (Onlne): 1694-0814 www.ijcsi.org 355 Usng EM algorthm as a new method for Synchronzaton and channel estmaton of

More information

AN EFFICIENT ITERATIVE DFT-BASED CHANNEL ESTIMATION FOR MIMO-OFDM SYSTEMS ON MULTIPATH CHANNELS

AN EFFICIENT ITERATIVE DFT-BASED CHANNEL ESTIMATION FOR MIMO-OFDM SYSTEMS ON MULTIPATH CHANNELS AN FFICINT ITRATIV DFT-BASD CHANNL STIMATION FOR MIMO-OFDM SYSTMS ON MULTIPATH CHANNLS Jan Hafang Graduate Unversty of the Chnese Academy of Scences Insttute of Semconductors, CAS Beng, Chna hf@sem.ac.cn

More information

DVB-T/H Digital Television Transmission and its Simulation over Ricean and Rayleigh Fading Channels

DVB-T/H Digital Television Transmission and its Simulation over Ricean and Rayleigh Fading Channels DVB-T/H Dgtal Televson Transmsson and ts Smulaton over Rcean and Raylegh Fadng Channels Ladslav Polák, Tomáš Kratochvl Department of Rado Electroncs, Brno Unversty of Technology, Purkyňova 118, 612 Brno,

More information

Performance and Analysis of CDM-FH-OFDMA for Broadband Wireless Systems

Performance and Analysis of CDM-FH-OFDMA for Broadband Wireless Systems Performance and Analyss of CDM-FH-OFDMA for Broadband Wreless Systems Kan Zheng, Lu Han, Janfeng Wang, Wenbo Wang Wreless Sgnal Processng Lab Bejng Unversty of Posts & Telecomms,Bejng, Chna Emal: zkan@buptneteducn

More information

Markov Chain Monte Carlo Detection for Underwater Acoustic Channels

Markov Chain Monte Carlo Detection for Underwater Acoustic Channels Markov Chan Monte Carlo Detecton for Underwater Acoustc Channels Hong Wan, Rong-Rong Chen, Jun Won Cho, Andrew Snger, James Presg, and Behrouz Farhang-Boroujeny Dept. of ECE, Unversty of Utah Dept. of

More information

Direct Sequence Spread Spectrum (DSSS)

Direct Sequence Spread Spectrum (DSSS) Drect Sequence Spread Spectrum (DSSS) DS-SS DS-SS uses sequences for spectrum spreadng and phase modulaton Modulaton s bnary SK (BSK) or quaternary SK (QSK) Message BSK - - - - QSK BSK Bt hase Dr. Cesar

More information

To: Professor Avitabile Date: February 4, 2003 From: Mechanical Student Subject: Experiment #1 Numerical Methods Using Excel

To: Professor Avitabile Date: February 4, 2003 From: Mechanical Student Subject: Experiment #1 Numerical Methods Using Excel To: Professor Avtable Date: February 4, 3 From: Mechancal Student Subject:.3 Experment # Numercal Methods Usng Excel Introducton Mcrosoft Excel s a spreadsheet program that can be used for data analyss,

More information

AIR FORCE INSTITUTE OF TECHNOLOGY

AIR FORCE INSTITUTE OF TECHNOLOGY MULTIPLE ACCESS INTERFERENCE CHARACTERIZATION FOR DIRECT-SEQUENCE SPREAD-SPECTRUM COMMUNICATIONS USING CHIP WAVEFORM SHAPING THESIS Matthew G. Glen, Captan, USAF AFIT/GE/ENG/04-10 DEPARTMENT OF THE AIR

More information

In-system Jitter Measurement Based on Blind Oversampling Data Recovery

In-system Jitter Measurement Based on Blind Oversampling Data Recovery RADIOENGINEERING, VOL. 1, NO. 1, APRIL 01 403 In-system Jtter Measurement Based on Blnd Oversamplng Data Recovery Mchal KUBÍČEK, Zdeněk KOLKA Dept. of Rado Electroncs, Brno Unversty of Technology, Purkyňova

More information

A Study on the Physical Layer Performance of GFDM for High Throughput Wireless Communication

A Study on the Physical Layer Performance of GFDM for High Throughput Wireless Communication 217 25th European Sgnal Processng Conference (EUSIPCO) A Study on the Physcal Layer Performance of GFDM for Hgh Throughput Wreless Communcaton Ahmad Nmr, Dan Zhang, Ana-Belen Martnez and Gerhard Fettwes

More information

Cooperative Multicast Scheduling Scheme for IPTV Service over IEEE Networks

Cooperative Multicast Scheduling Scheme for IPTV Service over IEEE Networks Cooperatve Multcast Schedulng Scheme for IPTV Servce over IEEE 802.16 Networks Fen Hou 1, Ln X. Ca 1, James She 1, Pn-Han Ho 1, Xuemn (Sherman Shen 1, and Junshan Zhang 2 Unversty of Waterloo, Waterloo,

More information

Throughput Maximization by Adaptive Threshold Adjustment for AMC Systems

Throughput Maximization by Adaptive Threshold Adjustment for AMC Systems APSIPA ASC 2011 X an Throughput Maxmzaton by Adaptve Threshold Adjustment for AMC Systems We-Shun Lao and Hsuan-Jung Su Graduate Insttute of Communcaton Engneerng Department of Electrcal Engneerng Natonal

More information

Multiuser Detection in Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing Systems by Blind Signal Separation Techniques

Multiuser Detection in Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing Systems by Blind Signal Separation Techniques Florda Internatonal Unversty FIU Dgtal Commons FIU Electronc Theses and Dssertatons Unversty Graduate School 3-6-01 Multuser Detecton n Multple Input Multple Output Orthogonal Frequency Dvson Multplexng

More information

On the Feasibility of Receive Collaboration in Wireless Sensor Networks

On the Feasibility of Receive Collaboration in Wireless Sensor Networks On the Feasblty of Receve Collaboraton n Wreless Sensor Networs B. Bantaleb, S. Sgg and M. Begl Computer Scence Department Insttute of Operatng System and Computer Networs (IBR) Braunschweg, Germany {behnam,

More information

The Stability Region of the Two-User Broadcast Channel

The Stability Region of the Two-User Broadcast Channel The Stablty Regon of the Two-User Broadcast Channel Nkolaos appas *, Maros Kountours, * Department of Scence and Technology, Lnköpng Unversty, Campus Norrköpng, 60 74, Sweden Mathematcal and Algorthmc

More information

DESIGN OF OPTIMIZED FIXED-POINT WCDMA RECEIVER

DESIGN OF OPTIMIZED FIXED-POINT WCDMA RECEIVER 7th European Sgnal Processng Conference (EUSIPCO 9) Glasgow, Scotland, August -8, 9 DESIGN OF OPTIMIZED FIXED-POINT WCDMA RECEIVER Ha-Nam Nguyen, Danel Menard, and Olver Senteys IRISA/INRIA, Unversty of

More information

Passive Filters. References: Barbow (pp ), Hayes & Horowitz (pp 32-60), Rizzoni (Chap. 6)

Passive Filters. References: Barbow (pp ), Hayes & Horowitz (pp 32-60), Rizzoni (Chap. 6) Passve Flters eferences: Barbow (pp 6575), Hayes & Horowtz (pp 360), zzon (Chap. 6) Frequencyselectve or flter crcuts pass to the output only those nput sgnals that are n a desred range of frequences (called

More information

SC-FDMA and OFDMA: An Efficient Wireless Image Transmission Schemes

SC-FDMA and OFDMA: An Efficient Wireless Image Transmission Schemes Journal of Control and Systems Engneerng 016, Vol. 4 Iss. 1, PP. 74-83 Frst onlne: 8 July 016 SC-FDMA and OFDMA: An Effcent Wreless Image Transmsson Schemes Fasal S. Al-Kamal 1, Abdullah A. Qasem, Samah

More information

Analysis of Time Delays in Synchronous and. Asynchronous Control Loops. Bj rn Wittenmark, Ben Bastian, and Johan Nilsson

Analysis of Time Delays in Synchronous and. Asynchronous Control Loops. Bj rn Wittenmark, Ben Bastian, and Johan Nilsson 37th CDC, Tampa, December 1998 Analyss of Delays n Synchronous and Asynchronous Control Loops Bj rn Wttenmark, Ben Bastan, and Johan Nlsson emal: bjorn@control.lth.se, ben@control.lth.se, and johan@control.lth.se

More information

Calculation model for SFN reception and reference receiver characteristics of ISDB-T system

Calculation model for SFN reception and reference receiver characteristics of ISDB-T system Report ITU-R BT.9-1 (5/13) Calculaton model for SFN recepton and reference recever characterstcs of ISDB-T system BT Seres Broadcastng servce (televson) Rep. ITU-R BT.9-1 Foreword The role of the Radocommuncaton

More information

Opportunistic Beamforming for Finite Horizon Multicast

Opportunistic Beamforming for Finite Horizon Multicast Opportunstc Beamformng for Fnte Horzon Multcast Gek Hong Sm, Joerg Wdmer, and Balaj Rengarajan allyson.sm@mdea.org, joerg.wdmer@mdea.org, and balaj.rengarajan@gmal.com Insttute IMDEA Networks, Madrd, Span

More information

California, 4 University of California, Berkeley

California, 4 University of California, Berkeley Dversty Processng WCDMA Cell earcher Implementaton Ahmed M. Eltawl, Eugene Grayver 2, Alreza Targhat, Jean Francos Frgon, Kambz hoarnejad, Hanl Zou 3 and Danjela Cabrc 4 Unversty of Calforna, Los Angeles,

More information

Evaluation of Downlink Performance of a Multiple-Cell, Rake Receiver Assisted CDMA Mobile System

Evaluation of Downlink Performance of a Multiple-Cell, Rake Receiver Assisted CDMA Mobile System Wreless Sensor Network,,, -6 do:.436/wsn.. Publshed Onlne January (http://www.scrp.org/journal/wsn/). Evaluaton of Downlnk Performance of a Multple-Cell, Rake Recever Asssted CDMA Moble System Ayodej J.

More information

Energy Efficiency Analysis of a Multichannel Wireless Access Protocol

Energy Efficiency Analysis of a Multichannel Wireless Access Protocol Energy Effcency Analyss of a Multchannel Wreless Access Protocol A. Chockalngam y, Wepng u, Mchele Zorz, and Laurence B. Mlsten Department of Electrcal and Computer Engneerng, Unversty of Calforna, San

More information

Effect of Time-Interleaved Analog-to-Digital Converter Mismatches on OFDM Performance

Effect of Time-Interleaved Analog-to-Digital Converter Mismatches on OFDM Performance Effect of Tme-Interleaved Analog-to-Dgtal Converter Msmatches on OFDM Performance Vo-Trung-Dung Huynh, Nele Noels, Peter Rombouts 2, Jean Armstrong 3, Hed Steendam Department of Telecommuncatons and Informaton

More information

Combined Beamforming and Scheduling for High Speed Downlink Packet Access

Combined Beamforming and Scheduling for High Speed Downlink Packet Access Combned Beamformng and Schedulng for Hgh Speed Downlnk Packet Access Alexander Seeger Informaton and Communcaton Moble Semens A.G. Hofmannstr.5, 8359 Munch, Germany Alexander.Seeger@semens.com Marcn Skora

More information

AN ALGORITHM TO COMBINE LINK ADAPTATION AND TRANSMIT POWER CONTROL IN HIPERLAN TYPE 2

AN ALGORITHM TO COMBINE LINK ADAPTATION AND TRANSMIT POWER CONTROL IN HIPERLAN TYPE 2 AN ALGORITHM TO COMBINE LINK ADAPTATION AND TRANSMIT POWER CONTROL IN HIPERLAN TYPE 2 Markus Radmrsch Inst. f. Allgem. Nachrchtentechnk, Unv. Hannover, Appelstr. 9a, 3167 Hannover, Germany Tel.: +49-511-762

More information

A NEW TRANSMISSION STRATEGY FOR SCALABLE MULTIMEDIA DATA ON OFDM SYSTEMS

A NEW TRANSMISSION STRATEGY FOR SCALABLE MULTIMEDIA DATA ON OFDM SYSTEMS 15th European Sgnal Processng Conference (EUSIPCO 27), Poznan, Poland, September 3-7, 27, copyrght by EURASIP A NEW TRANSMISSION STRATEGY FOR SCALABLE MULTIMEDIA DATA ON OFDM SYSTEMS Heykel Houas, Cléo

More information

Information-Theoretic Comparison of Channel Capacity for FDMA and DS-CDMA in a Rayleigh Fading Environment

Information-Theoretic Comparison of Channel Capacity for FDMA and DS-CDMA in a Rayleigh Fading Environment WSEAS TRANSATIONS on OMMUNIATIONS Informaton-Theoretc omparson of hannel apacty for FDMA and DS-DMA n a Raylegh Fadng Envronment PANAGIOTIS VARZAAS Department of Electroncs Technologcal Educatonal Insttute

More information

Keywords LTE, Uplink, Power Control, Fractional Power Control.

Keywords LTE, Uplink, Power Control, Fractional Power Control. Volume 3, Issue 6, June 2013 ISSN: 2277 128X Internatonal Journal of Advanced Research n Computer Scence and Software Engneerng Research Paper Avalable onlne at: www.jarcsse.com Uplnk Power Control Schemes

More information

Model mismatch and systematic errors in an optical FMCW distance measurement system

Model mismatch and systematic errors in an optical FMCW distance measurement system Model msmatch and systematc errors n an optcal FMCW dstance measurement system ROBERT GROSCHE ept. of Electrcal Engneerng Ruhr-Unverstät Bochum Unverstätsstrasse 50, -44780 Bochum GERMANY Abstract: - In

More information

PERFORMANCE EVALUATION OF A SPECTRUM-SENSING TECHNIQUE FOR LDACS AND JTIDS COEXISTENCE IN L-BAND

PERFORMANCE EVALUATION OF A SPECTRUM-SENSING TECHNIQUE FOR LDACS AND JTIDS COEXISTENCE IN L-BAND Proceedngs of SDR'1-WInnComm-Europe, 7-9 June 01 PERFORMANCE EVALUATION OF A SPECTRUM-SENSING TECHNIQUE FOR LDACS AND JTIDS COEXISTENCE IN L-BAND Gulo Bartol (Unverstà degl Stud d Frenze, Florence, Italy;

More information

Performance of Compressive Sensing Technique for Sparse Channel Estimation in Orthogonal Frequency Division Multiplexing Systems

Performance of Compressive Sensing Technique for Sparse Channel Estimation in Orthogonal Frequency Division Multiplexing Systems Performance of Compressve Sensng Technque for Sparse Channel Estmaton n Orthogonal Frequency Dvson Multplexng Systems P. Vmala 1 and G.Yamuna 1 Assstant Professor, Professor, Department of Electroncs and

More information

Resource Allocation Optimization for Device-to- Device Communication Underlaying Cellular Networks

Resource Allocation Optimization for Device-to- Device Communication Underlaying Cellular Networks Resource Allocaton Optmzaton for Devce-to- Devce Communcaton Underlayng Cellular Networks Bn Wang, L Chen, Xaohang Chen, Xn Zhang, and Dacheng Yang Wreless Theores and Technologes (WT&T) Bejng Unversty

More information

Effective SNR Based MIMO Switching in Mobile WiMAX Systems

Effective SNR Based MIMO Switching in Mobile WiMAX Systems Effectve SNR Based MIMO Swtcng n Moble WMAX Systems Myoung-Seob Km and Yong-wan Lee Scool of Electrcal Engneerng and INMC, Seoul Natonal Unversty Kwanak P. O. Box, Seoul -600 Korea Emal: mseob@ttl.snu.ac.kr

More information

A MODIFIED DIRECTIONAL FREQUENCY REUSE PLAN BASED ON CHANNEL ALTERNATION AND ROTATION

A MODIFIED DIRECTIONAL FREQUENCY REUSE PLAN BASED ON CHANNEL ALTERNATION AND ROTATION A MODIFIED DIRECTIONAL FREQUENCY REUSE PLAN BASED ON CHANNEL ALTERNATION AND ROTATION Vncent A. Nguyen Peng-Jun Wan Ophr Freder Computer Scence Department Illnos Insttute of Technology Chcago, Illnos vnguyen@t.edu,

More information

Distributed Resource Allocation and Scheduling in OFDMA Wireless Networks

Distributed Resource Allocation and Scheduling in OFDMA Wireless Networks Southern Illnos Unversty Carbondale OpenSIUC Conference Proceedngs Department of Electrcal and Computer Engneerng 11-2006 Dstrbuted Resource Allocaton and Schedulng n OFDMA Wreless Networks Xangpng Qn

More information

Ergodic Capacity of Block-Fading Gaussian Broadcast and Multi-access Channels for Single-User-Selection and Constant-Power

Ergodic Capacity of Block-Fading Gaussian Broadcast and Multi-access Channels for Single-User-Selection and Constant-Power 7th European Sgnal Processng Conference EUSIPCO 29 Glasgow, Scotland, August 24-28, 29 Ergodc Capacty of Block-Fadng Gaussan Broadcast and Mult-access Channels for Sngle-User-Selecton and Constant-Power

More information

Clustering Based Fractional Frequency Reuse and Fair Resource Allocation in Multi-cell Networks

Clustering Based Fractional Frequency Reuse and Fair Resource Allocation in Multi-cell Networks Ths full text paper was peer revewed at the drecton of IEEE Communcatons Socety subject matter experts for publcaton n the IEEE ICC 21 proceedngs Clusterng Based Fractonal Frequency Reuse and Far Resource

More information

RC Filters TEP Related Topics Principle Equipment

RC Filters TEP Related Topics Principle Equipment RC Flters TEP Related Topcs Hgh-pass, low-pass, Wen-Robnson brdge, parallel-t flters, dfferentatng network, ntegratng network, step response, square wave, transfer functon. Prncple Resstor-Capactor (RC)

More information

DESIGN OF OPTIMIZED FIXED-POINT WCDMA RECEIVER

DESIGN OF OPTIMIZED FIXED-POINT WCDMA RECEIVER DESIGN OF OPTIMIZED FIXED-POINT WCDMA RECEIVER Ha-Nam Nguyen, Danel Menard, and Olver Senteys IRISA/INRIA, Unversty of Rennes, rue de Kerampont F-3 Lannon Emal: hanguyen@rsa.fr ABSTRACT To satsfy energy

More information

CELLULAR SYSTEM CAPACITY and PERFORMANCE IMPROVEMENT with SDMA

CELLULAR SYSTEM CAPACITY and PERFORMANCE IMPROVEMENT with SDMA CELLULAR SYSTEM CAPACITY and PERFORMANCE IMPROVEMENT wth SDMA Flpe Alves, Henrque Rbero, José Fernandes 3 Escola Superor de Tecnologa, Insttuto Poltécnco de Castelo Branco, 6 Castelo Branco, Portugal Phone:+35-7-339355

More information

Performance Study of OFDMA vs. OFDM/SDMA

Performance Study of OFDMA vs. OFDM/SDMA Performance Study of OFDA vs. OFD/SDA Zhua Guo and Wenwu Zhu crosoft Research, Asa 3F, Beng Sgma Center, No. 49, Zhchun Road adan Dstrct, Beng 00080, P. R. Chna {zhguo, wwzhu}@mcrosoft.com Abstract: In

More information

An Improved Method for GPS-based Network Position Location in Forests 1

An Improved Method for GPS-based Network Position Location in Forests 1 Ths full text paper was peer revewed at the drecton of IEEE Communcatons Socety subject matter experts for publcaton n the WCNC 008 proceedngs. An Improved Method for GPS-based Network Poston Locaton n

More information

Approximating User Distributions in WCDMA Networks Using 2-D Gaussian

Approximating User Distributions in WCDMA Networks Using 2-D Gaussian CCCT 05: INTERNATIONAL CONFERENCE ON COMPUTING, COMMUNICATIONS, AND CONTROL TECHNOLOGIES 1 Approxmatng User Dstrbutons n CDMA Networks Usng 2-D Gaussan Son NGUYEN and Robert AKL Department of Computer

More information

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 13, NO. 12, DECEMBER

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 13, NO. 12, DECEMBER IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 3, NO. 2, DECEMBER 204 695 On Spatal Capacty of Wreless Ad Hoc Networks wth Threshold Based Schedulng Yue Lng Che, Student Member, IEEE, Ru Zhang, Member,

More information

A High-Sensitivity Oversampling Digital Signal Detection Technique for CMOS Image Sensors Using Non-destructive Intermediate High-Speed Readout Mode

A High-Sensitivity Oversampling Digital Signal Detection Technique for CMOS Image Sensors Using Non-destructive Intermediate High-Speed Readout Mode A Hgh-Senstvty Oversamplng Dgtal Sgnal Detecton Technque for CMOS Image Sensors Usng Non-destructve Intermedate Hgh-Speed Readout Mode Shoj Kawahto*, Nobuhro Kawa** and Yoshak Tadokoro** *Research Insttute

More information

Power Minimization Under Constant Throughput Constraint in Wireless Networks with Beamforming

Power Minimization Under Constant Throughput Constraint in Wireless Networks with Beamforming Power Mnmzaton Under Constant Throughput Constrant n Wreless etworks wth Beamformng Zhu Han and K.J. Ray Lu, Electrcal and Computer Engneer Department, Unversty of Maryland, College Park. Abstract In mult-access

More information

Secure Transmission of Sensitive data using multiple channels

Secure Transmission of Sensitive data using multiple channels Secure Transmsson of Senstve data usng multple channels Ahmed A. Belal, Ph.D. Department of computer scence and automatc control Faculty of Engneerng Unversty of Alexandra Alexandra, Egypt. aabelal@hotmal.com

More information

Hierarchical Generalized Cantor Set Modulation

Hierarchical Generalized Cantor Set Modulation 8th Internatonal Symposum on Wreless Communcaton Systems, Aachen Herarchcal Generalzed Cantor Set Modulaton Smon Görtzen, Lars Schefler, Anke Schmenk Informaton Theory and Systematc Desgn of Communcaton

More information

Joint Adaptive Modulation and Power Allocation in Cognitive Radio Networks

Joint Adaptive Modulation and Power Allocation in Cognitive Radio Networks I. J. Communcatons, etwork and System Scences, 8, 3, 7-83 Publshed Onlne August 8 n ScRes (http://www.scrp.org/journal/jcns/). Jont Adaptve Modulaton and Power Allocaton n Cogntve Rado etworks Dong LI,

More information

Chaotic Filter Bank for Computer Cryptography

Chaotic Filter Bank for Computer Cryptography Chaotc Flter Bank for Computer Cryptography Bngo Wng-uen Lng Telephone: 44 () 784894 Fax: 44 () 784893 Emal: HTwng-kuen.lng@kcl.ac.ukTH Department of Electronc Engneerng, Dvson of Engneerng, ng s College

More information