多载波DS-CDMA的盲自适应逐次干扰抵消
Blind Adaptive Successive Interference Cancellation for Multicarrier DS-CDMA
摘要：
提出了一种基于连续干扰抵消（SIC）结构的多载波DS-CDMA自适应接收机设计。在MC DS-CDMA中，限制SIC性能的主要问题之一是对多址干扰（MAI）的不完全估计，从而在多径衰落信道中获得有限的频率分集增益。在本文中，我们设计了一个盲自适应SIC与新的多址干扰抑制能力，实现在解扩过程中，以改善检测和消除过程。此外，从解扩器权重导出的动态缩放因子用于干扰消除过程。在每个子载波上应用的这种方法之后是最大比或等增益组合，以充分利用多载波CDMA系统中固有的频率分集。结果表明，这种方法的MAI估计的各个子载波上提供了显着改善的性能相比，与传统的匹配滤波器（MF）和SIC技术在一个小的增加的复杂性MC DS-CDMA系统。在严重的远近效应、衰落相关和系统负载条件下进行了性能评估，以确认所提出的自适应接收机设计方法的增益。
英文摘要：
A new adaptive receiver design for the Multicarrier (MC) DS-CDMA is proposed employing successive interference cancellation (SIC) architecture. One of the main problems limiting the performance of SIC in MC DS-CDMA is the imperfect estimation of multiple access interference (MAI), and hence, the limited frequency diversity gain achieved in multipath fading channels. In this paper, we design a blind adaptive SIC with new multiple access interference suppression capability implemented within despreading process to improve both detection and cancellation processes. Furthermore, dynamic scaling factors derived from the despreader weights are used for interference cancellation process. This method applied on each subcarrier is followed by maximum ratio or equal gain combining to fully exploit the frequency diversity inherent in the multicarrier CDMA systems. It is shown that this way of MAI estimation on individual subcarrier provides significantly improved performance for a MC DS-CDMA system compared to that with conventional matched filter (MF) and SIC techniques at a little added complexity. Performance evaluation under severe nearfar, fading correlation and system loading conditions are carried out to affirm the gain of the proposed adaptive receiver design approach.
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