Paper Info
Title
A linear MMSE receiver for multipath asynchronous random-CDMA with chip pulse shaping
Abstract
This paper studies the design and implementation of a linear minimum mean-square error (LMMSE) receiver in asynchronous direct-sequence code-division multiple-access (DS-CDMA) systems that employ long-code pseudonoise (PN) sequences and operate in multipath environments. The receiver is shown to be capable of multiple-access interference (MAI) suppression and multipath diversity combining without the knowledge of other users' signature sequences. It maximizes output signal-to-noise ratio (SNR) with the aid of a new chip filter which exploits the cyclostationarity of the received signal and combines all paths of the desired user that fall within its supported time span. The performance of the LMMSE receiver is compared with that of the coherent selective RAKE receiver. The achieved gain is on the order of 0.6-1.8 dB in dense multipath environments of current narrow-band settings and nonuniform power distribution scenarios of next-generation CDMA systems. An example of adaptive implementation of the LMMSE receiver is presented and accompanied by complexity analysis, training curves, and quantitative performance comparisons illustrating the convergence rate and steady-state performance of the adaptive algorithms.
Year
DOI
Venue
2002
10.1109/TVT.2002.801746
Vehicular Technology, IEEE Transactions  
Keywords
Field
DocType
code division multiple access,computational complexity,convergence of numerical methods,diversity reception,filtering theory,interference suppression,land mobile radio,least mean squares methods,multipath channels,multiuser channels,pseudonoise codes,radio receivers,radiofrequency interference,sequences,spread spectrum communication,LMMSE filtering,LMMSE receiver,PN sequences,SNR,adaptive algorithms,adaptive receiver,asynchronous DS-CDMA systems,chip filter,chip pulse shaping,coherent selective RAKE receiver,complexity analysis,computational complexity,convergence rate,direct-sequence code-division multiple-access,interference suppression,linear MMSE receiver,linear minimum mean-square error,long-code pseudonoise sequences,mobile radio,multipath asynchronous random-CDMA,multipath diversity combining,multipath environments,multiple-access interference suppression,nonuniform power distribution,output signal-to-noise ratio,received signal cyclostationarity,steady-state performance,training curves
Multipath propagation,Asynchronous communication,Rake receiver,Radio receiver design,Equalization (audio),Computer science,Adaptive equalizer,Electronic engineering,Code division multiple access,Spread spectrum
Journal
Volume
Issue
ISSN
51
5
0018-9545
Citations 
PageRank 
References 
8
0.66
18
Authors
2
Name
Order
Citations
PageRank
A. Mirbagheri1141.42
Y. C. Yoon220324.14