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A DSP-based DS-CDMA multiuser receiver employing partial parallel interference cancellation

N.S. Correal, R.M. Buehrer, B.D. Woerner
1999 IEEE Journal on Selected Areas in Communications  
The implementation of advanced DS-CDMA receivers based on multiuser detection principles is becoming a reality thanks to the combination of an improved understanding of the theoretical basis of multiuser  ...  In a parallel interference cancellation receiver, it is practical to use the soft outputs of a matched filter bank for amplitude estimation.  ...  Breslin for developing the multisensor testbed, and S. Nicoloso for his priceless contributions to this project.  ... 
doi:10.1109/49.761040 fatcat:hgvvtrbowvgwzkwkos3qlle3by

Reduced and differential parallel interference cancellation for CDMA systems

A. Nahler, R. Irmer, G. Fettweis
2002 IEEE Journal on Selected Areas in Communications  
It is shown that a combination of both approaches leads to a performance very close to the single-user bound whereas the complexity can be kept on the order of the conventional RAKE receiver.  ...  Index Terms-Code division multiple access, multicarrier spread spectrum, multiuser detection, parallel interference cancellation. Manuscript  ...  ACKNOWLEDGMENT The authors would like to thank the anonymous reviewers for their helpful comments to improve the quality of the paper.  ... 
doi:10.1109/49.983335 fatcat:vmbwbdxer5devd6wl2bgaidiam

Spectrally Shaped Generalized Multitone Direct Sequence Spread Spectrum

D.W. Matolak, W. Xiong
2006 IEEE Transactions on Vehicular Technology  
These channel models cannot model the real channel between the transmitter and receiver of MC-DS-CDMA systems for all cases.  ...  For instance, we can apply interference canceling (IC) schemes (e.g., [28] , [29] ) to cancel the effect of the interference from other subcarriers, and improve the BER performance of SSG-MT-DS-SS, or  ...  subcarrier decision metric are ( ) As a special case, the BER performance of "single carrier SW-SSG-MT-DS-CDMA," or DS-SS-CDMA with our sinusoidal chip waveform, for different channel conditions, is now  ... 
doi:10.1109/tvt.2006.877492 fatcat:3v4iza2nojgzzkvl2iq25vmwi4

Smart antennas: state of the art

H. Boche, A. Bourdoux, J.R. Fonollosa, T. Kaiser, A. Molisch, W. Utschick
2006 IEEE Vehicular Technology Magazine  
Aim of this contribution is to illustrate the state of the art of smart antenna research from several perspectives.  ...  The bow is drawn from transmitter issues via channel measurements and modeling, receiver signal processing, network aspects, technological challenges towards first smart antenna applications and current  ...  Ernst Bonek, and the COST 273 subworking group 2.1 for helpful discussions. Part of this work was financially supported by an INGVAR grant from the SSF and a grant from Vetenskapsradet. Thomas  ... 
doi:10.1109/mvt.2006.1663946 fatcat:dry3hooucfahbncq5vp3g2hsha

Near-Capacity Wireless Transceivers and Cooperative Communications in the MIMO Era: Evolution of Standards, Waveform Design, and Future Perspectives

Lajos Hanzo, Mohammed El-Hajjar, Osamah Alamri
2011 Proceedings of the IEEE  
By contrast, the MIMO capacity increases linearly 14 with the number of transmit antennas, provided that the num-15 ber of receive antennas is equal to the number of transmit 16 antennas.  ...  With the further proviso that the total transmit 17 power is increased proportionately to the number of trans-18  ...  A two-antenna-aided receiver 1491 was implemented for the sake of decoding the two users' 1492 data, while eliminating the interference imposed by the 1493 users on each others' data.  ... 
doi:10.1109/jproc.2011.2148150 fatcat:h5figg46rfdfngebjrbmyyekle

Packet Scheduling in Wireless Systems using MIMO Arrays and VBLAST Architecture

Constantine Floros, John S. Thompson, Steve McLaughlin
2007 2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring  
This thesis aims to examine ways of increasing the spectral efficiency of a communication system while meeting the Q0S needs of the users.  ...  Two of the key requirements in these systems are higher spectral efficiency and QoS (Quality of Service).  ...  Using symbol cancellation, interference from already-detected components of the transmitted signal are subtracted out from the received signal vector, resulting in a modifiedExploiting Multiuser Diversity  ... 
doi:10.1109/vetecs.2007.571 dblp:conf/vtc/FlorosTM07 fatcat:wnps3532nvfpzepvg4dd5ghsne

Rapid digital architecture design of orthogonal matching pursuit

Benjamin Knoop, Jochen Rust, Sebastian Schmale, Dagmar Peters-Drolshagen, Steffen Paul
2016 2016 24th European Signal Processing Conference (EUSIPCO)  
The growing availability of computing power allows for the implementation of algorithms of increasing computational complexity.  ...  For instance, a complex-valued digital architecture for the Orthogonal Matching Pursuit (OMP) algorithm with rank-1 updating has successfully been implemented and tested, which can be utilised for the  ...  DoA Direction of Arrival DS-CDMA Direct Sequence CDMA DSP Digital Signal Processor or Digital Signal Processing DSSS Direct Sequence Spread Spectrum DTA Data Type Agnosticism ERVD Element-Wise Real-Value  ... 
doi:10.1109/eusipco.2016.7760570 dblp:conf/eusipco/KnoopRSPP16 fatcat:bo3c4fo6njeo3hjjsnwo72jbwe

Ultra-wideband communications - An idea whose time has come

Liuqing Yang, G.B. Giannakis
2004 IEEE Signal Processing Magazine  
It overviews the state-of-the-art in channel modeling, transmitters, and receivers of UWB radios, and outlines research directions and challenges to be overcome.  ...  As signal processing expertise is expected to have major impact in research and development of UWB systems, emphasis is placed on DSP aspects.  ...  His general interests span the areas of communications and signal processing, estimation and detection theory, time-series analysis, and system identification, on which he has published more than 200 journal  ... 
doi:10.1109/msp.2004.1359140 fatcat:wpf7n3shlbb27kyld2xxtkvzuu

Signal processing for optical fiber based wireless access

Xavier N. Fernando, John C. Armitage
2017 Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging  
However, a directly Recently, some two-stage cancellation techniques for the multiuser interference in a wireless DS/CDMA environment have been investigated. This work was extended by W.  ...  We use a discrete time domain to ease DSP implementations.  ...  This issue is discussed in this appendix where it shown that a bandpass nonlinear system can be either represented by two real orthogonal baseband nonlinear models or by an amplitude and phase baseband  ... 
doi:10.1117/12.2283858 fatcat:yydww3ni2jchtjnxruaznhtr5m

Wireless Myths, Realities, and Futures: From 3G/4G to Optical and Quantum Wireless

L. Hanzo, H. Haas, S. Imre, D. O'Brien, M. Rupp, L. Gyongyosi
2012 Proceedings of the IEEE  
In wireless systems there is always a trade-off between reducing the transmit power and mitigating the resultant signal-degradation imposed by the transmit-power reduction with the aid of sophisticated  ...  receiver algorithms, when considering the total energy consumption.  ...  Mehlführer for their expert support of the measure-ments as well as S. Schwarz for providing LTE simulations and preparing Figs. 9-11 at the University of Technology, Vienna, Austria.  ... 
doi:10.1109/jproc.2012.2189788 fatcat:ieo4t2fwarcrjbxzfj3u7ejty4

Reconfigurable Structures for Direct Equalisation in Mobile Receivers [article]

Felip Riera-Palou
2014 arXiv   pre-print
This is especially true in the case of mobile systems, where multipath propagation causes the received signal to be seriously degraded.  ...  LE and DFE are implemented using finite impulse response (FIR) filters whose frequency spectrum approximates the inverse of the channel spectrum plus noise.  ...  Of the different types of CDMA, the one covered here is the direct sequence CDMA (DS-CDMA) which is the one selected by all forthcoming 3G systems. In DS-CDMA, each user is assigned a code.  ... 
arXiv:1401.7216v1 fatcat:z653f7gqavgltehsby4bhtb5cu

Design of large polyphase filters in the Quadratic Residue Number System

Gian Carlo Cardarilli, Alberto Nannarelli, Yann Oster, Massimo Petricca, Marco Re
2010 2010 Conference Record of the Forty Fourth Asilomar Conference on Signals, Systems and Computers  
Perfect self interference cancellation is not possible in real systems due to noise in the estimates of the signals required for cancellation.  ...  its power to partially cancel the effect of the interference so that the uninformed relay benefits from this cancellation and so the source benefits in turn.  ... 
doi:10.1109/acssc.2010.5757589 fatcat:ccxnu5owr5fyrcjcqukumerueq

Group-blind multiuser detection for CDMA systems [article]

Jae-Chon Yu, University Of Calgary, University Of Calgary, Anders Host-Madsen
2005
BiblioWque nationale du Canada uisitions and 9-Acquisitions el Bib lographic Services services bibliographiques The author has granted a nonexclusive licence allowing the National Library of Canada to  ...  L'auteur a accord6 me licence non exclusive pennettant A la Bibliothwe nationale du Canada de reproduke, pr&ery distxibuer ou vendre &s copies de cette these sous la forme de microfiche/film, de reproduction  ...  Therefore, in a real-time implementation of the group bIind multiuser detector, a reduced complexity updating algorithm for finding the eigenvalues and eigenvectors is needed.  ... 
doi:10.11575/prism/14237 fatcat:2txz7msyzvafhp52q2ripqbvrm

CODE ACQUISITION IN DS-CDMA SYSTEMS OPTIMIZATION AND DSP IMPLEMENTATION

Mayowa Aregbesola
unpublished
CCStudio delivers all of the host tools and runtime software support for your TMS320 DSP based real-time embedded application to market faster.  ...  A goal for future work should be to implement the whole system on a DSP and hardware implementation on FPGA & ASIC.  ...  The Probability of detection is only meaningful when the Mean acquisition time is considered. For the same scenario, the time to acquire the correct phase for the modified scheme is lower.  ... 
fatcat:ea2sewduozdsfogobtxg3dfbbu

Implementation Issues [chapter]

Multi-Carrier and Spread Spectrum Systems  
Today, the use of fast programmable DSP or FPGA components allows the implementation of efficient real-time multi-standard receivers.  ...  DSP or FPGA) is usually needed parallel to simulations to test in real time the performance of a given code.  ...  Interference cancellation (IC): operation of estimating and subtracting the interference in the case of multi-user signal detection.  ... 
doi:10.1002/9780470714249.ch4 fatcat:vp55g2zd2rgl5grhbyprze6cu4
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