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Performance analysis of coded space-time adaptive detection in DS/CDMA systems over Rayleigh fading channels

机译：DS / CDMA系统中瑞利衰落信道上编码时空自适应检测的性能分析

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摘要

In this paper, we study the use of channel coding in a direct-sequence code-division multiple-access (DS-CDMA) system that employs space-time adaptive minimum-mean square-error (MMSE) interference suppression over Rayleigh fading channels. It is shown that the employment of adaptive antenna arrays at the receiver can assist in attenuating multiuser interference and at the same time speeds-up the convergence rate of the adaptive receiver. In this work, we assess the accuracy of the theoretical results developed for the uncoded and convolutionally coded space-time multiuser detector when applied to the adaptive case. It is found that the use of antenna arrays brings the receiver performance very close to its multiuser counterpart. Using performance error bounds, we show that a user-capacity gain of approximately 200% can easily be achieved for the space-time adaptive detector when used with a rate 1/2 convolutional code (CC) and a practical channel interleaver. This capacity gain is only 10% less than the gain achieved for the more complicated multiuser-based receiver. Finally, we perform a comparison between convolutional and turbo coding where we find that the latter outperforms the former at all practical bit-error rates (BER).
机译：在本文中，我们研究了信道编码在直接序列码分多址（DS-CDMA）系统中的使用，该系统在瑞利衰落信道上采用时空自适应最小均方误差（MMSE）干扰抑制。结果表明，在接收器处采用自适应天线阵列可以帮助衰减多用户干扰，并同时加快自适应接收器的收敛速度。在这项工作中，我们评估了适用于自适应情况时为未编码和卷积编码的时空多用户检测器开发的理论结果的准确性。发现天线阵列的使用使接收机性能非常接近其多用户同类产品。使用性能误差界限，我们表明，与比率1/2卷积码（CC）和实用的信道交织器配合使用时，时空自适应检测器可以轻松实现约200％的用户容量增益。该容量增益仅比更复杂的基于多用户的接收器所获得的增益小10％。最后，我们在卷积编码和turbo编码之间进行比较，发现在所有实际误码率（BER）下，后者都优于前者。

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