Ds-cdma receivers in Rayleigh fading multipath channels: Direct vs. indirect methods

被引：0

作者：

Dahmane, AO ^{[1
]}

Massicotte, D ^{[1
]}

机构：

[1] Univ Quebec, Ecole Ingn, Lab Signal & Syst Integrat, Dept Elect & Comp Engn, Trois Rivieres, PQ G9A 5H7, Canada

来源：

PROCEEDINGS OF THE IASTED INTERNATIONAL CONFERENCE ON COMMUNICATIONS, INTERNET, AND INFORMATION TECHNOLOGY | 2002年

关键词：

multiuser detection (MUD); indirect receiver; direct receiver; DS-CDMA; wireless communication; normalized Least Square Algorithm (NLMS);

D O I：

暂无

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

In Direct-Sequence Code Division Multiple Access (DS-CDMA) systems, the performances are limited by Multiple Access Interference (MAI) and InterSymbol Interference (ISI) due to channel effects. To increase the capacity and allow high data rates, MultiUser Detection (MUD) techniques are used. In this paper, the performances of direct and indirect MUD applied to a synchronous DS-CDMA system with multipath Rayleigh channels are reported. The direct MUD is represented by an adaptive linear FIR filter using the normalized least mean square algorithm (FIR-NLMS) while the indirect method is represented by the Minimum Mean Square Error (MMSE). The simulation results show that the optimal (perfect channel identification) indirect MMSE outperforms the adaptive FIR-NLMS. However, with imperfect channel estimation, the FIR-NLMS shows better performances. The convergence speed, and a way to fasten it, is also presented in the simulations results.

引用

页码：252 / 256

页数：5

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