A multistage multi-carrier CDMA receiver with enhanced interference suppression

2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 1900-01-01 DOI:10.1109/SPAWC.2001.923869

Juinn-Horng Deng, Ta-Sung Lee

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Abstract

A multistage multi-carrier CDMA (MSMC-CDMA) receiver with enhanced multiple access interference (MAI) suppression is proposed. MC-CDMA is based on a combination of CDMA and orthogonal frequency division multiplexing (OFDM) techniques. The design of the receiver involves the following procedure. First, a set of adaptive matched filters (MF) is constructed to collect multipath signals with different time delays. The tap weights of each MF are determined in accordance with the linearly constrained minimum variance (LCMV) criterion so that strong MAI can be effectively suppressed. Second, channel estimation and signal reconstruction are accomplished by exploiting pilot symbols, decision-directed symbols and the signal's signature. Finally, a decision-directed RAKE receiver gives the estimate of the signal, which is then subtracted from the data sent to the next stage. The proposed receiver can be used in a reverse link system with time-multiplexed pilot symbols, and achieves nearly the performance of the optimal maximum SINR (MSINR) receiver.

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一种增强干扰抑制的多级多载波CDMA接收机

提出了一种具有增强多址干扰抑制功能的多级多载波CDMA (MSMC-CDMA)接收机。MC-CDMA是基于CDMA和正交频分复用(OFDM)技术的结合。接收机的设计包括以下步骤。首先，构造一组自适应匹配滤波器(MF)来采集不同时延的多径信号。根据线性约束最小方差(LCMV)准则确定每个MF的抽头权重，从而有效抑制强MAI。其次，利用导频符号、决策导向符号和信号特征来完成信道估计和信号重构;最后，一个决策导向的RAKE接收器给出信号的估计值，然后从发送到下一阶段的数据中减去。该接收机可用于具有时复用导频符号的反向链路系统，性能接近最优最大信噪比(MSINR)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)

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