基于频域均衡的CP-SC-CDMA下行链路性能分析

Performance Analysis for CP-SC-CDMA Downlink Transmission Based on Frequency Domain Equalization

基于循环前缀的单载波频域均衡码分多址系统CP-SC-CDMA能够消除多径信道引起的数据块之间的干扰,同时利用简单的单抽头频域均衡代替传统的复杂度较高的RAKE接收机和时域均衡器弥补时间弥散带来的频率选择性衰落。从理论上分析CP-SC-CDMA系统中固有的残余码间干扰问题,并针对多用户下行链路对各种合并分集方案进行比较,从理论分析和仿真结果两方面给出最小均方误差合并方案是折中残余码间干扰和信噪比的最佳合并方案。

The CP-SC-CDMA system based on Cyclic Prefix(CP) can remove the inter-block-interference(IBI) due to the multipath channel and meanwhile equalize the frequency-selective fading channel with simple one-tap frequency domain equalization(one-tap FDE) rather than the conventional RAKE receiver and time domain equalizer which possess high complexity.In this paper the theoretical analysis of the residual inter-code-interference(ICI) is presented and also some kinds of combining techniques are compared based on the multi-user downlink transmission.Results show that MMSEC is the best combining technique which gives a good trade off between residual ICI and signal to noise ratio(SNR).