RAKE Receiver. Tommi Heikkilä S Postgraduate Course in Radio Communications, Autumn II.
|
|
- Maud Hampton
- 6 years ago
- Views:
Transcription
1 S Postgraduate Course in Radio Counications, Autun RAKE Receiver Toi Heikkilä toiheikkila@teliasoneraco Abstract RAKE receiver is used in CDMA-based (Code Division Multiple Access) systes and can cobine ultipath coponents, which are tie-delayed versions of the original signal transission Cobining is done in order to iprove the signal to noise ration at the receiver RAKE receiver attepts to collect the tie-shifted versions of the original signal by providing a separate correlation receiver for each of the ultipath signals This can be done due to ultipath coponents are practically uncorrelated fro another when their relative propagation delay exceeds a chip period This paper presents the basics of RAKE receiver technique, ipleentation, and design in cellular systes Also the usage of RAKE receiver is introduced in CDMA-based systes such as S-95 and WCDMA (Wideband Code Division Multiple Access) ndex Ters RAKE receiver, CDMA, ultipath, receiver, axial-ratio cobining RAKE RECEVER Due to reflections fro obstacles a radio channel can consist of any copies of originally transitted signals having different aplitudes, phases, and delays f the signal coponents arrive ore than duration of one chip apart fro each other, a RAKE receiver can be used to resolve and cobine the The RAKE receiver uses a ultipath diversity principle t is like a rake that rakes the energy fro the ultipath propagated signal coponents [2] A Multipath Channel Model Multipath can occur in radio channel in various ways such as, reflection and diffraction fro buildings, and scattering fro trees presented in Figure 1 NTRODUCTON n CDMA (Code Division Multiple Access) spread spectru systes, the chip rate is typically uch greater than the flat fading bandwidth of the channel Where as conventional odulation techniques require an equalizer to undo the intersybol interference (S) between adjacent sybols, CDMA spreading codes are designed to provide very low correlation between successive chips Thus, propagation delay spread in the radio channel erely provides ultiple versions of the transitted signal at the receiver f these ultipath coponents are delayed in tie by ore than one chip duration, they appear like uncorrelated noise at a CDMA receiver, and equalization is not required RAKE receiver, used specially in CDMA cellular systes, can cobine ultipath coponents, which are tie-delayed versions of the original signal transission This cobining is done in order to iprove the signal to noise ratio (SNR) at the receiver RAKE receiver attepts to collect the tieshifted versions of the original signal by providing a separate correlation receiver for each of the ultipath signals This can be done due to ultipath coponents are practically uncorrelated fro another when their relative propagation delay exceeds a chip period The basic idea of A RAKE receiver was first proposed by Price and Green These fellows also filed the RAKE receiver patent in 1956 [1] Figure 1 Propagation echaniss An M-ray ultipath odel is shown in Figure 4, which is an extension to the ultipath channel odel presented in [3] Each of the M paths has an independent delay,, and an independent coplex tie-variant gain, G
2 S Postgraduate Course in Radio Counications, Autun t(t) Delay 1 Delay 2 Delay M G 1 (t) G 2 (t) G M (t) Figure 2 Multipath channel odel B M-finger RAKE Receiver Additive Gaussian Noise r(t) Multiple Access nterference A RAKE receiver utilizes ultiple correlators to separately detect M strongest ultipath coponents The outputs of each correlator are weighted to provide better estiate of the transitted signal than is provided by a single coponent Deodulation and bit decisions are then based on the weighted outputs of the M correlators [1] r(t) 1 (t) 2 (t) M (t) Correlator 1 Correlator 2 Correlator M Z 1 Z 2 Z M 1 2 Z Z T > ()dt M Figure 3 An M-branch RAKE receiver ipleentation o < (t) Each correlator detects a tie-shifted version of the original CDMA transission, and each finger of the RAKE correlates to a portion of the signal, which is delayed by at least one chip in tie fro the other fingers Assue M correlators are used in a CDMA receiver to capture M strongest ultipath coponents A weighting network is used to provide a linear cobination of the correlator output for bit decision Correlator 1 is synchronized to the strongest ultipath 1 Multipath coponent 2 arrived t 1 later than 1 but has low correlation with 1 The M decision statistics are weighted to for an overall decision statistic as shown in Figure 3 The outputs of the M correlators are denoted as Z 1, Z 2,, and Z M They are weighted by 1, 2,, and M, respectively The weighting coefficients are based on the power or the SNR (Signal-to- Noise Ratio) fro each correlator output f the power or SNR is sall out of a particular correlator, it will be assigned a sall weighting factor, f axial-ratio cobining is used, following equation 1 can be written for Z M Z' Z (1) 1 The weighting coefficients,, are noralized to the output signal power of the correlator in such a way that the coefficients su to unity, as shown in following equation 2 2 Z Z (2) M 2 1 As in the case of adaptive equalizers and diversity cobining, there are any ways to generate the weighting coefficients However, due to Multiple Access nterference (MA), RAKE fingers with strong ultipath aplitudes will not necessarily provide strong output after correlation Choosing weighting coefficients based on the actual outputs of the correlator yields better RAKE perforance [1] C RAKE Receiver Block Diagra When a signal is received in a atched filter over a ultipath channel, the ultiple delays appear at the receiver, as depicted in Figure 4 The RAKE receiver uses several baseband correlators to individually process several signal ultipath coponents The correlator outputs are cobined to achieve iproved counications reliability and perforance [2] Bit decisions based only a single correlation ay produce a large bit error rate as the ultipath coponent processed in that correlator can be corrupted by fading n a RAKE receiver, if the output fro one correlator is corrupted by fading, the others ay not be, and the corrupted signal ay be discounted through the weighting process [1] nput RF signal Correlator Code generators Matched filter Q Tiing and finger allocation Channel estiators Phase rotator Delay equalizer Finger 1 Finger 2 Finger 3 Figure 4 Block diagra of a RAKE receiver Q Cobiner Output pulse response easureents of the ultipath channel profile are executed through a atched filter to ake a successful de-spreading t reveals ultipath channel peaks and gives tiing and RAKE finger allocations to different receiver blocks Later it tracks and onitors these peaks with a easureent rate depending on speeds of obile station and on propagation environent The nuber of available RAKE fingers depends on the channel profile and the chip rate The higher the chip rate, the ore resolvable paths there are, but higher chip rate will cause wider bandwidth To catch all the energy fro the channel ore RAKE fingers are needed A very large nuber of fingers lead to cobining losses and practical ipleentation probles
3 S Postgraduate Course in Radio Counications, Autun RAKE RECEVER N S-95 SYSTEM n the ipleentation of the S-95 syste, the obile receiver eploys a searcher receiver and three digital data receivers that act as fingers of a RAKE in that they ay be assigned to track and isolate particular ultipath coponents of a single cell site, a single base station in softer handover and ultiple base stations in soft handover The PN chip rate of 1,2288 MHz allows for resolution of ultipaths at tie intervals of 1,2288 x 10-6 s = 0,814 s, which eans that ultipath difference in eters can be around 244 [4] A Downlink The searcher receiver scans the tie doain about the desired signal s expected tie of arrival for ultipath pilot signals fro the sae cell site and pilot signals and their ultipaths fro other cell sites Searching the tie doain on the downlink signals is siplified because the pilot channel perits the coherent detection of signals The search receiver indicates to the obile phone s control processor where, in tie, the strongest replicas of the signal can be found, and their respective signal strengths n turn, the control processor provides tiing and PN code inforation to the tree digital data receivers, enabling each of the to track and deodulate a different signal [4] f a another cell site pilot signal becoes significantly stronger than the current pilot signal, the control processor initiates handover procedures during which the downlinks of both cell sites transit at the sae call data on all their traffic channels When both sites handle the call, additional space diversity or acro diversity is obtained [4] The data fro all three digital receivers are cobined for iproved resistance to fading Different base stations or sectors are distinguished by different short PN code offsets The downlink perfors coherent post-detection cobining after ensuring that the data streas are tie-aligned; perforance is not coproised by using post-detection cobining because the odulation technique is linear Coherent cobining is possible because the pilot signal fro each base station provides a coherent phase reference that can be tracked by the digital data receivers [4] B Uplink On the uplink, the base station receiver uses two antennas for space diversity reception, and there are four digital data receivers available for tracking up to four ultipath coponents of a particular subscriber s signal The searcher receiver at the base station can distinguish the desired obile signal by eans of its unique scrabling long PN code offset, acquired before voice or data transission begins on the link, using s special preable for that purpose [4] During soft handover fro one base station site to another, the voice data that are selected could result fro cobining up to eight ultipath coponents, four at each site The uplink transission, not having a coherent phase reference like the downlink s pilot signal, ust be deodulated and cobined non-coherently; axial-ratio cobining can be done by weighting each path s sybol statistics in proportion to the path s relative power prior to deodulation and decoding decision [4] V RAKE RECEVER N WCDMA SYSTEM A basic ipleentation of RAKE receiver presented in Figure 5 despreads data fro different ultipath coponents, cobines the ultipath coponents, and detects cobined data to soft bits A WCDMA base station RAKE receiver contains the following functions to enable the receiving of CDMA type of ultipath signals [5] 1 Channel delay estiation for ultipath coponents This can also called as pulse Response (R) Measureent 2 RAKE receiver finger allocation based on the channel delay estiation 3 RAKE receiver fingers to perfor the descrabling and despreading operations 4 Adaptive channel estiation 5 Maxial-Ratio Cobining (MRC) ANT A/D pulse Response easureent Matched Filters Chiprate Fin ger Allocation Co rrelator f inger 2 finger n Sybol Rat e Sybol Rate Rate f inger 1 Cob iner C hannel Estiation Figure 5 RAKE receiver in WCDMA A Channel Delay Estiation Soft Decision User Datarate The channel pulse Response Measureent (RM) is perfored by using Matched Filter (MF) type of correlators that correlate the received signal with known reference code sequence such as pilot channel code The MF resources contain shorter filters (length of 64 chips tie period for RACH and 32 chips tie period for DPCCH), which can be concatenated in tie doain to enable the proper delay estiation also in large cells with large delay spreads (eg hilly terrain environents) [5] To iprove the delay estiation perforance and to increase signal to noise ratio the results of MFs are further processed by coherent and non-coherent averaging The length of the coherent R averaging is typically one tie slot while the noncoherent averaging is typically done over radio fraes The length of the averaging operations can be selected by paraetrization The accuracy of the R easureent is ¼ chip (65,1 ns) [5]
4 S Postgraduate Course in Radio Counications, Autun B RAKE Receiver Finger Allocation The purpose of the RAKE finger allocation procedure is to define the optial finger delay positions that axiize the receiver perforance The allocation procedure defines the correct delay positions for despreading (in RAKE fingers) the received wideband signal to sybol level inforation n the case of receiver antenna diversity the finger allocation procedure cobines inforation fro separate receiver antennas n softer handover the allocation procedure defines the optial finger delay positions by taking into account the inforation fro all the sectors involved in the handover situation [5] The finger allocation procedure contains algoriths, which eliinate the unnecessary changes in the finger tie positions between successive allocations Thus the despreading of a certain ultipath coponent is kept on the sae RAKE finger as long as possible to axiize the perforance of channel estiation and axial-ratio cobining [5] n the finger allocation procedure also the shape of the channel ipulse response is taken into account when defining the optiu finger delay positions t has been confired that the allocation ust be done differently for the channels where the taps are very close to each others (so called "fat finger") than for channels with clearly separate taps [5] Typically the allocation frequency in noral operation ode is one allocation for a code channel in every 25 s (accuracy of ¼ chip), which is enough for all the practical situations Code tracking with accuracy of 1/8 chip is further used in RAKE fingers to track and copensate sall delay deviations in ultipath coponent tiing The change in the tiing can be caused by the oveent of the UE or by the transission tiing adjustent of the UE [5] C RAKE Receiver Finger Descrabling and Despreading The despreading operation for DPDCH (Dedicated Physical Data Channel) and DPCCH (Dedicated Physical Control Channel) is perfored in RAKE fingers to recover the receiver wideband signal to sybol level inforation - ultiplying of incoing signal by coplex conjugate of scrabling code and channelization code and accuulating the results over sybol periods n the base station receiver 8 fingers are allocated for each code channel (ie 8 ultipath coponents can be despread for a single user) [5] Code tracking is used to track and copensate sall deviations in ultipath coponent delays ie the Code tracking perfors the fine adjustent of the delay used in the despreading The tracking is done for every finger and the accuracy is 1/8 chip Like in the ain finger allocation procedure the shape of the channel ipulse response is taken into account when defining the despreading tiings [5] Typically the delay updating by code tracking is perfored once in each or every second 10 s radio frae [5] D Adaptive Channel Estiation The goal adaptive channel estiation is to estiate the characteristics of the tie-variant channel n WCDMA the solution is Pilot Sybol Aided plus adaptive filtering [5] The channel estiation is used to reove distortion caused by radio channel and it is based on the known pilot sybols on DPCCH The channel estiator filter adapts to the Doppler power spectru (both frequency and the shape of the spectru) The estiation is done for each finger separately The use of adaptive filter ensures good perforance in all kind of propagation conditions The advantage of adaptive filter coefficients copared to use of fixed coefficient is evident since the solution with fixed coefficients would perfor well only in a constricted set of propagation conditions [5] n the case of ultiple receiver antennas the perforance of channel estiation is further iproved by cobining the power spectru inforation available fro different receiver antennas [5] The cobining process is based on axial-ratio cobining, which decreases the effect of additive noise, which can further be decreased by channel decoding[5] E Maxial-Ratio Cobining (MRC) Maxial-Ratio Cobining, first discussed by Brennan, is the optial for of diversity cobining because it yields the axial SNR achievable t requires the exact knowledge of SNRs as well as the phases of the diversity signals [4] Figure 6 Maxial Ratio Cobining in RAKE After despreading the received sybol fro transitter via radio channel the sybols fro allocated fingers are axial-ratio-cobined to construct the cobined sybol The output sybols fro different fingers are ultiplied with coplex conjugate of the channel estiate and the result of ultiplication is sued together into the cobined sybol This is illustrated in Figure 6 and Figure 7 [5]
5 S Postgraduate Course in Radio Counications, Autun Finger Allocation Delay estiations 1 2 n [4] Sauel C Yang, CDMA RF Syste Engineering, Norwood MA, USA, Artech House nc, 1998, 280 pp [5] Mikko Järvelä, RAKE training slides by Nokia, , Oulu RAKE finger bank Finger 1 r 1 MRC cobiner HOMEWORK RX RF ADC Finger 2 r 2 w1 + Output 1 Explain shortly the basic functions in a RAKE receiver Finger n r n w2 w n Channel estiator Figure 7 RAKE receiver using MRC F Practical RAKE Receiver Requireents High bandwidth (5 MHz in WCDMA) and dynaic interference inherent to WCDMA requires that RF and F parts have to operate linearly with large dynaic range n practical RAKE receivers synchronization sets soe requireents Autoatic Gain Control (AGC) loop is needed to keep the receiver at the dynaic range of the A/D converter AGC ust be fast and accurate enough to keep receiver at the linear range Frae-by-frae data range change ay set higher AGC and A/D (Analog-to-Digital) converter requireents The high sapling rates of few tens of MHz and high dynaics of the input signal (80 db) require fast A/D converters and high resolution [5] Autoatic Frequency Control (AFC) loop copensates for drift of the local oscillator and possibly copensates the Doppler shifts Synchronization is required for channel ipulse response easureents and scanning for RAKE finger allocation Also channel delay tracking needs synchronization for fine-adjustent and tracking of ultipath coponents [5] Pilots 2 How any fingers can a Mobile Station RAKE receiver s atched filter or searcher allocate fro a following ultipath tapped delay line channel in WCDMA and S-95 systes? Don t guess! Tap Avg 0-1,5-6,0-4,5-9,0-15,5 power (db) Relative delay (ns) V CONCLUSON This paper has introduced the basic operation and requireents of RAKE receiver used in CDMA based systes such as S-95 and WCDMA RAKE receiver attepts to collect the tie-shifted versions of the original signal by providing a separate correlation receiver for each of the ultipath signals The RAKE receiver uses several baseband correlators to individually process several signal ultipath coponents The correlator outputs are cobined to achieve iproved counications reliability and perforance The basic functions of RAKE receiver are Channel delay estiation for ultipath coponents, RAKE receiver finger allocation, descrabling and despreading operations, adaptive channel estiation, and Maxial-Ratio Cobining REFERENCES [1] Rappaport, Wireless Counications Principles and Practice, Prentice Hall, New Jersey, 1996, pp [2] Tero Ojanperä, Rajee Prasad, Wideband CDMA for Third Generation Mobile Counications, Norwood MA, USA, Artect House nc, 1998, 439 pp [3] Sion Haykin, Michael Moher: Modern Wireless Counications, Prentice Hall 2005, pp
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 informationMulticarrier 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 informationNotes on Orthogonal Frequency Division Multiplexing (OFDM)
Notes on Orthogonal Frequency Division Multiplexing (OFDM). Discrete Fourier ransfor As a reinder, the analytic fors of Fourier and inverse Fourier transfors are X f x t t, f dt x t exp j2 ft dt (.) where
More informationELEC2202 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 informationRelation 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 informationDSI3 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 informationDesign of Adjustable Reconfigurable Wireless Single Core
IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735. Volume 6, Issue 2 (May. - Jun. 2013), PP 51-55 Design of Adjustable Reconfigurable Wireless Single
More informationModel 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 informationLETTER 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 informationIterative 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 informationOverlapped 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 informationSNR Performance Analysis of Rake Receiver for WCDMA
International Journal of Computational Engineering & Management, Vol. 15 Issue 2, March 2012 www..org SNR Performance Analysis of Rake Receiver for WCDMA 62 Nikhil B. Patel 1 and K. R. Parmar 2 1 Electronics
More informationTransmit 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 informationVHDL-AMS Behavioral Modeling and Simulation of M-QAM transceiver system
SETT 7 th nternational Conference: Sciences Of Electronic, Technologies Of nforation And Telecounications March 5-9, 7 TUNSA VHDL-AMS Behavioral Modeling and Siulation of M-AM transceiver syste Kari JABER,
More informationImplementation of Adaptive Viterbi Decoder
Ipleentation of Adaptive Viterbi Decoder Devendra Made #1 VIII Se B.E.(Etrx) K.D.K.College of Engineering, Nagpur, Maharashtra(I) Asst. Prof. R.B. Khule *2 M.Tech V.L.S.I. K.D.K.College of Engineering,
More informationCellular Network Planning and Optimization Part VI: WCDMA Basics. Jyri Hämäläinen, Communications and Networking Department, TKK, 24.1.
Cellular Network Planning and Optimization Part VI: WCDMA Basics Jyri Hämäläinen, Communications and Networking Department, TKK, 24.1.2008 Outline Network elements Physical layer Radio resource management
More informationA 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 informationCOMBINED 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 informationEFFECTS 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 informationECE 6560 Multirate Signal Processing Analysis & Synthesis Notes
Multirate Signal Processing Analysis & Synthesis Notes Dr. Bradley J. Bazuin Western Michigan University College of Engineering and Applied Sciences Departent of Electrical and Coputer Engineering 1903
More informationBlock Diagram of FM Receiver
FM Receivers FM receivers, like AM receivers, utilize the superheterodyne principle, but they operate at uch higher frequencies (88-108 MHz). A liiter is often used to ensure the received signal is constant
More informationAdaptive 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 informationAllocation of Multiple Services in Multi-Access Wireless Systems
Allocation of Multiple Serices in Multi-Access Wireless Systes Anders Furuskär Wireless@KTH, Royal Institute of Technology, Sweden and Ericsson Research anders.furuskar@era.ericsson.se Abstract This paper
More informationPerformance 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 informationAn 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 informationInternational Journal of Electronics and Electrical Engineering Vol. 1, No. 3, September, 2013 MC-DS-CDMA
International Journal of Electronics and Electrical Engineering Vol. 1, No. 3, Septeber, 2013 Analysis of Carrier Frequency Selective Offset Estiation - Using Zero-IF and ZCZ In MC-DS-CDMA Venkatachala.
More informationResearch Letter Chip-Level HARQ Chase Combining for HSUPA
Research Letters in Counications Volue 29, Article ID 23276, 4 pages doi:11155/29/23276 Research Letter Chip-Level HARQ Chase Cobining for HSUPA Mohaed Et Tolba, 1, 2 Sair Saoudi, 1, 2 Raphaël Visoz, 3
More informationExperiment 7: Frequency Modulation and Phase Locked Loops October 11, 2006
Experient 7: Frequency Modulation and Phase ocked oops October 11, 2006 Frequency Modulation Norally, we consider a voltage wave for with a fixed frequency of the for v(t) = V sin(ω c t + θ), (1) where
More informationHIGH FREQUENCY LASER BASED ACOUSTIC MICROSCOPY USING A CW GENERATION SOURCE
HIGH FREQUENCY LASER BASED ACOUSTIC MICROSCOPY USING A CW GENERATION SOURCE T.W. Murray, O. Balogun, and N. Pratt Departent of Aerospace and Mechanical Engineering, Boston University, Boston MA 0225 Abstract:
More informationAdditive Synthesis, Amplitude Modulation and Frequency Modulation
Additive Synthesis, Aplitude Modulation and Frequency Modulation Pro Eduardo R Miranda Varèse-Gastproessor eduardo.iranda@btinternet.co Electronic Music Studio TU Berlin Institute o Counications Research
More informationA 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 informationDIGITAL 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 informationA 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 informationPerformance 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 informationOTC Statistics of High- and Low-Frequency Motions of a Moored Tanker. sensitive to lateral loading such as the SAL5 and
OTC 61 78 Statistics of High- and Low-Frequency Motions of a Moored Tanker by J.A..Pinkster, Maritie Research Inst. Netherlands Copyright 1989, Offshore Technology Conference This paper was presented at
More informationCharacterization and Modeling of Underwater Acoustic Communications Channels for Frequency-Shift-Keying Signals
Characterization and Modeling of Underwater Acoustic Counications Channels for Frequency-Shift-Keying Signals Wen-Bin Yang and T.C. Yang Naval Research Laboratory Washington, DC 375 USA Abstract In a fading
More informationEQUALIZED 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 informationKalman 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 informationEnergy-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 informationTransmit Beamforming and Iterative Water-Filling Based on SLNR for OFDMA Systems
Transit Beaforing and Iterative Water-Filling Based on SLNR for OFDMA Systes Kazunori Hayashi, Megui Kaneko, Takeshi Fui, Hideaki Sakai Graduate School of Inforatics, Kyoto University, Yoshida Honachi
More informationUsing 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 informationTESTING OF ADCS BY FREQUENCY-DOMAIN ANALYSIS IN MULTI-TONE MODE
THE PUBLISHING HOUSE PROCEEDINGS OF THE ROMANIAN ACADEMY, Series A, OF THE ROMANIAN ACADEMY Volue 5, Nuber /004, pp.000-000 TESTING OF ADCS BY FREQUENCY-DOMAIN ANALYSIS IN MULTI-TONE MODE Daniel BELEGA
More informationPerformance of RAKE receiver over different UWB channel
Advances in Wireless and Mobile Communications. ISSN 0973-6972 Volume 10, Number 5 (2017), pp. 1097-1105 Research India Publications http://www.ripublication.com Performance of RAKE receiver over different
More informationLOW COST PRODUCTION PHASE NOISE MEASUREMENTS ON MICROWAVE AND MILLIMETRE WAVE FREQUENCY SOURCES
Page 1 of 10 LOW COST PRODUCTION PHASE NOISE MEASUREMENTS ON MICROWAVE AND MILLIMETRE WAVE FREQUENCY SOURCES Hugh McPherson Spectral Line Systes Ltd, Units 1,2&3 Scott Road, Tarbert, Isle of Harris. www.spectral-line-systes.co.uk
More informationPhase 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 informationDIRECT 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 informationModeling 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 informationORTHOGONAL frequency division multiplexing (OFDM) has become the most popular multicarrier
IEEE SIGNAL PROCESSING LETTERS 1 MultipleInput MultipleOutput OFDM with Index Modulation Ertuğrul Başar, Meber, IEEE Abstract arxiv:1510.06141v1 [cs.it] 1 Oct 015 Orthogonal frequency division ultiplexing
More informationReceiver Design for Downlink MIMO MC-CDMA in Cognitive Radio Systems
1st Annual IEEE International Syposiu on Personal, Indoor and Mobile Radio Counications Receiver Design for Downlink MIMO MC-CDMA in Cognitive Radio Systes M. Raabzadeh 1, and. hoshbin 1 1 Electrical Engineering
More informationKeywords: International Mobile Telecommunication (IMT) Systems, evaluating the usage of frequency bands, evaluation indicators
2nd International Conference on Advances in Mechanical Engineering and Industrial Inforatics (AMEII 206) Entropy Method based Evaluation for Spectru Usage Efficiency of International Mobile Telecounication
More informationA Frequency Domain Approach to Design Constrained Amplitude Spreading Sequences for DS-CDMA Systems for Frequency Selective Fading Channels
A Frequency Doain Approach to Design Constrained Aplitude Spreading Sequences for DS-CDMA Systes for Frequency Selective Fading Channels B.J.Peiris, K.R.Narayanan and S.L. Miller Dept. of Electrical Engineering
More informationPARAMETER OPTIMIZATION OF THE ADAPTIVE MVDR QR-BASED BEAMFORMER FOR JAMMING AND MULTIPATH SUPRESSION IN GPS/GLONASS RECEIVERS
PARAMETER OPTIMIZATION OF THE ADAPTIVE MVDR QR-BASED BEAMFORMER FOR JAMMING AND MULTIPATH SUPRESSION IN GPS/GLONASS RECEIVERS V. Behar 1, Ch. Kabakchiev 2, G. Gaydadjiev 3, G.Kuzanov 4, P. Ganchosov 5
More informationACCURATE DISPLACEMENT MEASUREMENT BASED ON THE FREQUENCY VARIATION MONITORING OF ULTRASONIC SIGNALS
XVII IMEKO World Congress Metrology in 3rd Millenniu June 22 27, 2003, Dubrovnik, Croatia ACCURATE DISPLACEMENT MEASUREMENT BASED ON THE FREQUENCY VARIATION MONITORING OF ULTRASONIC SIGNALS Ch. Papageorgiou
More informationWaveform Design and Receive Processing for Nonrecurrent Nonlinear FMCW Radar
Wavefor Design and Receive Processing for Nonrecurrent Nonlinear FMCW Radar John Jakabosky and Shannon D. Blunt Radar Systes Lab University of Kansas Lawrence, KS Braha Hied Sensors Directorate Air Force
More informationIntroduction 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 informationTransmit Diversity Schemes for CDMA-2000
1 of 5 Transmit Diversity Schemes for CDMA-2000 Dinesh Rajan Rice University 6100 Main St. Houston, TX 77005 dinesh@rice.edu Steven D. Gray Nokia Research Center 6000, Connection Dr. Irving, TX 75240 steven.gray@nokia.com
More informationMOBILE 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 informationCDMA & WCDMA (UMTS) AIR INTERFACE. ECE 2526-WIRELESS & CELLULAR COMMUNICATION SYSTEMS Monday, June 25, 2018
CDMA & WCDMA (UMTS) AIR INTERFACE ECE 2526-WIRELESS & CELLULAR COMMUNICATION SYSTEMS Monday, June 25, 2018 SPREAD SPECTRUM OPTIONS (1) Fast Frequency Hopping (FFSH) Advantages: Has higher anti-jamming
More informationAccuBridge TOWARDS THE DEVELOPMENT OF A DC CURRENT COMPARATOR RATIO STANDARD
AccuBridge TOWARD THE DEVELOPMENT OF A DC CURRENT COMPARATOR RATO TANDARD Duane Brown,Andrew Wachowicz, Dr. hiping Huang 3 Measureents nternational, Prescott Canada duanebrown@intl.co, Measureents nternational,
More information4G Communication Resource Analysis with Adaptive Physical Layer Technique
International Journal of Engineering Trends and Technology (IJETT) Volue 33 uber - March 206 4G Counication Resource Analysis with Adaptive Physical Layer Technique Mubinul Haque, Dr. Md. Abu Bakar Siddiqui
More informationWCDMA Basics Chapter 2 OBJECTIVES:
WCDMA Basics Chapter 2 This chapter is designed to give the students a brief review of the WCDMA basics of the WCDMA Experimental System. This is meant as a review only as the WCDMA basics have already
More informationSpread Spectrum Basics Spreading Codes IS-95 Features- Transmitter/Receiver Power Control Diversity Techniques RAKE Receiver Soft Handoff
CDMA Mobile Communication & IS-95 1 Outline Spread Spectrum Basics Spreading Codes IS-95 Features- Transmitter/Receiver Power Control Diversity Techniques RAKE Receiver Soft Handoff 2 Spread Spectrum A
More informationUWB System for Time-Domain Near-Field Antenna Measurement
UWB Syste for Tie-Doain Near-Field Antenna Measureent B. Levitas #, M. Drozdov #, I. Naidionova #, S. Jefreov #, S. Malyshev *2, A. Chizh *3 www.geozondas.co # Geozondas Ltd., 6, Shevchenko Str., LT-3,
More informationA Pre-FFT OFDM Adaptive Antenna Array with Eigenvector Combining
A Pre- OFDM Adaptive Antenna Array ith Eigenvector Cobining Shinsuke Hara y, Montree Budsabathon y, and Yoshitaka Hara y Departent of Electronic, Inforation and Energy Engineering, Graduate School of Engineering,
More informationCDMA Spread Spectrum in Communications Systems
Muhaad Ali Jinnah University, Islaabad Capus, akistan in Counications Systes ORIGIAL SIGAL BI Lecturer: Assoc. rof. Dr oor M Khan Departent of Electronic Engineering, Muhaad Ali Jinnah University, Islaabad
More informationCross-correlation tracking for Maximum Length Sequence based acoustic localisation
Cross-correlation tracking for Maxiu Length Sequence based acoustic localisation Navinda Kottege Research School of Inforation Sciences and Engineering The Australian National University, ACT, Australia
More informationCOMPARISON OF TOKEN HOLDING TIME STRATEGIES FOR A STATIC TOKEN PASSING BUS. M.E. Ulug
COMPARISON OF TOKEN HOLDING TIME STRATEGIES FOR A STATIC TOKEN PASSING BUS M.E. Ulug General Electric Corporate Research and Developent Schenectady, New York 1245 ABSTRACT Waiting ties have been calculated
More informationES 442 Homework #8 Solutions (Spring 2018 Due April 16, 2018 ) Print out homework and do work on the printed pages.. Problem 1 ASCII Code (20 points)
Hoework 8 NAME olutions E 44 Hoework #8 olutions (pring 018 Due April 16, 018 ) Print out hoework and do work on the printed pages.. Proble 1 ACII Code (0 points) he Aerican tandard Code for Inforation
More informationIndoor Multiple-Antenna Channel Characterization from 2 to 8 GHz
Indoor Multiple-Antenna Channel Characterization fro to 8 GHz Ada S Y Poon and Minnie Ho Counications and Interconnect Lab, Intel Corporation Abstract In ultiple-antenna channels, e optiality of a transission
More informationLevel 6 Graduate Diploma in Engineering Wireless and mobile communications
9210-119 Level 6 Graduate Diploma in Engineering Wireless and mobile communications Sample Paper You should have the following for this examination one answer book non-programmable calculator pen, pencil,
More informationSECURITY 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 informationEfficient Non-linear Changed Mel-filter Bank VAD Algorithm
Matheatical Models and Methods in Modern Science Efficient on-linear Changed Mel-filter Bank VAD Algorith DAMJA VLAJ, ZDRAVKO KAČIČ, MARKO KOS Faculty of Electrical Engineering and Coputer Science University
More informationOn the Reverse Link Capacity of cdma2000 High Rate Packet Data Systems
On the Reverse Link Capacity of cda High Rate Packet Data Systes Eduardo Esteves QUALCOMM Incorporated 5775 Morehouse Drive San Diego, CA 911-1714 Abstract cda high rate packet data standard, also known
More informationDESIGN AND IMPLEMENTATION OF WCDMA RAKE RECEIVER USED IN 3G WIRELESS COMMUNICATION
http:// DESIGN AND IMPLEMENTATION OF WCDMA RAKE RECEIVER USED IN 3G WIRELESS COMMUNICATION Kapil Sahu 1, Sarita Boolchandani 2, Brijesh Kumar 3 1,2,3 E & C Dept., Vivekananda Institute of Technology-East,
More informationcdma2000 1x Rev. E Forward Link Voice Capacity
cdma2 1x Rev. E Forward Link Voice Capacity Yucheun Jou, Peter Black, Qiang Wu, Rashid Attar, Wanlun Zhao, Bharat Ahuja, Junsheng Han Qualcomm Inc, San Diego, CA 92121, USA Abstract The forward link capacity
More informationREPORT ITU-R SA Telecommunication characteristics and requirements for space VLBI systems
Rep. ITU-R SA.2132 1 REPORT ITU-R SA.2132 Telecounication characteristics and requireents for space VLBI systes (2008) This Report describes the characteristics of the space VLBI systes. These characteristics
More informationSmarter Balanced Assessment Consortium Claims, Targets, and Standard Alignment for Math
Sarter Balanced Assessent Consortiu Clais, s, Stard Alignent for Math The Sarter Balanced Assessent Consortiu (SBAC) has created a hierarchy coprised of clais targets that together can be used to ake stateents
More informationFundamental study for measuring microflow with Michelson interferometer enhanced by external random signal
Bulletin of the JSME Journal of Advanced Mechanical Design, Systes, and Manufacturing Vol.8, No.4, 2014 Fundaental study for easuring icroflow with Michelson interferoeter enhanced by external rando signal
More informationSIG: Signal-Processing
TH Köln - Technology, Arts, Sciences Prof. Dr. Rainer Bartz SIG: Signal-Processing Copendiu (6) Prof. Dr.-Ing. Rainer Bartz rainer.bartz@th-koeln.de Contact: eail: website: office: rainer.bartz@th-koeln.de
More informationW-CDMA for UMTS Principles
W-CDMA for UMTS Principles Introduction CDMA Background/ History Code Division Multiple Access (CDMA) Why CDMA? CDMA Principles / Spreading Codes Multi-path Radio Channel and Rake Receiver Problems to
More informationStudy and Implementation of Complementary Golay Sequences for PAR reduction in OFDM signals
Study and Ipleentation of Copleentary Golay Sequences for PAR reduction in OFDM signals Abstract In this paper soe results of PAR reduction in OFDM signals and error correction capabilities by using Copleentary
More informationOutage 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 informationA 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 informationDesign and Implementation of Block Based Transpose Form FIR Filter
Design and Ipleentation of Bloc Based Transpose For FIR Filter O. Venata rishna 1, Dr. C. Venata Narasihulu 2, Dr.. Satya Prasad 3 1 (ECE, CVR College of Engineering, Hyderabad, India) 2 (ECE, Geethanjali
More informationA Selection Region Based Routing Protocol for Random Mobile ad hoc Networks with Directional Antennas
A Selection Region Based Routing Protocol for Rando Mobile ad hoc Networks with Directional Antennas arxiv:1011.6017v1 cs.it] 8 Nov 010 Di Li, Changchuan Yin, and Changhai Chen Key Laboratory of Universal
More informationExam 3 is two weeks from today. Today s is the final lecture that will be included on the exam.
ECE 5325/6325: Wireless Communication Systems Lecture Notes, Spring 2010 Lecture 19 Today: (1) Diversity Exam 3 is two weeks from today. Today s is the final lecture that will be included on the exam.
More informationThe 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 informationNon-Linear Weighting Function for Non-stationary Signal Denoising
Non-Linear Weighting Function for Non-stationary Signal Denoising Farès Abda, David Brie, Radu Ranta To cite this version: Farès Abda, David Brie, Radu Ranta. Non-Linear Weighting Function for Non-stationary
More informationSimplified 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 informationSpeech 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 informationInterference Mitigation by CDMA RAKE Receiver With Walsh-Hadamard Sequence
Interference Mitigation by CDMA RAKE Receiver With Walsh-adamard Sequence Braj Bhooshan Pandey Research Scholar, M.E. R.K.D.F. Institute of Science & Technology, Bhopal Bhopal, INDIA pandey_023brajbhooshan@yahoo.com
More informationSNS COLLEGE OF ENGINEERING COIMBATORE DEPARTMENT OF INFORMATION TECHNOLOGY QUESTION BANK
SNS COLLEGE OF ENGINEERING COIMBATORE 641107 DEPARTMENT OF INFORMATION TECHNOLOGY QUESTION BANK EC6801 WIRELESS COMMUNICATION UNIT-I WIRELESS CHANNELS PART-A 1. What is propagation model? 2. What are the
More informationINTERNATIONAL TELECOMMUNICATION UNION
INTERNATIONAL TELECOMMUNICATION UNION ITU-T J.133 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2002) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA
More informationCH 5. Air Interface of the IS-95A CDMA System
CH 5. Air Interface of the IS-95A CDMA System 1 Contents Summary of IS-95A Physical Layer Parameters Forward Link Structure Pilot, Sync, Paging, and Traffic Channels Channel Coding, Interleaving, Data
More informationNONLINEAR WAVELET PACKET DENOISING OF IMPULSIVE VIBRATION SIGNALS NIKOLAOS G. NIKOLAOU, IOANNIS A. ANTONIADIS
NONLINEAR WAVELET PACKET DENOISING OF IMPULSIVE VIBRATION SIGNALS NIKOLAOS G. NIKOLAOU, IOANNIS A. ANTONIADIS Departent of Mechanical Engineering, Machine Design and Control Systes Section National Technical
More informationSecondary-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 informationCapacity Enhancement of MIMO-OFDM System in Rayleigh Fading Channel
IOSR Journal of Electronics and Counication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735. Volue 6, Issue 1 (May. - Jun. 2013), PP 49-58 Capacity Enhanceent of MIMO-OFDM Syste in Rayleigh
More informationInvestigating Multiple Alternating Cooperative Broadcasts to Enhance Network Longevity
Investigating Multiple Alternating Cooperative Broadcasts to Enhance Network Longevity Aravind Kailas School of Electrical and Coputer Engineering Georgia Institute of Technology Atlanta, Georgia 3033-050,
More informationDistributed Resource Allocation Assisted by Intercell Interference Mitigation in Downlink Multicell MC DS-CDMA Systems
1 Distributed Resource Allocation Assisted by Intercell Interference Mitigation in Downlin Multicell MC DS-CDMA Systes Jia Shi, Zhengyu Song, IEEE Meber, and Qiang Ni, IEEE Senior Meber Abstract This paper
More informationPower Optimal Signaling for Fading Multi-access Channel in Presence of Coding Gap
Power Optial Signaling for Fading Multi-access Channel in Presence of Coding Gap Ankit Sethi, Prasanna Chaporkar, and Abhay Karandikar Abstract In a ulti-access fading channel, dynaic allocation of bandwidth,
More information