Minimum probability of error for asynchronous Gaussian multiple-access channels
IEEE Transactions on Information Theory
CDMA: principles of spread spectrum communication
CDMA: principles of spread spectrum communication
Multiuser Detection
Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
The LMMSE Estimate-Based Multiuser Detector: Performance Analyses and Adaptive Implementation
ICASSP '97 Proceedings of the 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP '97) -Volume 1 - Volume 1
Blind equalization in antenna array CDMA systems
IEEE Transactions on Signal Processing
IEEE Transactions on Information Theory
Optimum near-far resistance for dual-rate DS/CDMA signals: random signature sequence analysis
IEEE Transactions on Information Theory
A new receiver structure for asynchronous CDMA: STAR-the spatio-temporal array-receiver
IEEE Journal on Selected Areas in Communications
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This work proposed the linear minimum mean square error (LMMSE) space-timereceivers for synchronous multi-rate direct sequence code devision multipleaccess (DS/CDMA) systems. The performance of the proposed receivers isanalyzed. The high-rate (HR) LMMSE space-time receiver with combiningtechnique can provide essentially the same performance for low-rate (LR) usersas LR LMMSE space-time receiver while eliminate the time delay for the HRusers. The performance of the proposed multi-rate LMMSE space-time receiversare studied in the context of two multi-rate access methods: multi-code (MC)access where high data rate users multiplex their information streams ontomultiple codes, and variable spreading length (VSL) access where signaturesequences of different lengths are assigned to users with different datarates.Through the simulation results, we show that: (a) the proposed multi-rateLMMSE space-time receivers are optimum near-far resistant; (b) the proposedmulti-rate LMMSE space-time receivers have a clear performance improvementcompared to the time only LMMSE dual rate receiver; (c) there is a performancegain of the proposed multi-rate LMMSE space-time receivers compared to themulti-rate decorrelating space-time receiver when near-far ratio (NFR) is low;(d) The performance difference between MMSE combining and MRC in multi-ratesystem is much more pronounced than in single-rate system. Simulations alsoshow that the VSL access method is more robust than MC access methodconsidering changing rate-ratio in multi-rate systems.