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首页> 外文期刊>IEICE Transactions on Communications >Performance Comparison of Delay Transmit Diversity and Frequency-Domain Space-Time Coded Transmit Diversity for Orthogonal Multicode DS-CDMA Signal Reception Using Frequency-Domain Equalization
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Performance Comparison of Delay Transmit Diversity and Frequency-Domain Space-Time Coded Transmit Diversity for Orthogonal Multicode DS-CDMA Signal Reception Using Frequency-Domain Equalization

机译：使用频域均衡的正交多码DS-CDMA信号接收时延发射分集和频域空时编码发射分集的性能比较

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摘要

In a severe frequency-selective fading channel, the bit error rate (BER) performance of orthogonal multicode DS-CDMA is severely degraded since the orthogonality property of spreading codes is partially lost. The frequency-selectivity of a fading channel can be exploited by using frequency-domain equalization to improve the BER performance. Further performance improvement can be obtained by using transmit diversity. In this paper, joint transmit diversity and frequency-domain equalization is presented for the reception of orthogonal multicode DS-CDMA signals in a frequency-selective fading channel. As for transmit diversity, delay transmit diversity (DTD) and frequency-domain space-time transmit diversity (STTD) are considered. The achievable BER performance of multicode DS-CDMA in a frequency-selective Rayleigh fading channel is evaluated by computer simulation. It is shown that the frequency-domain STTD significantly improves the BER performance irrespective of the degree of the channel frequency-selectivity while DTD is useful only for a weak frequency-selective channel.
机译：在严重的频率选择衰落信道中，由于扩展码的正交性部分丢失，正交多码DS-CDMA的误码率（BER）性能严重降低。衰落信道的频率选择性可以通过使用频域均衡来改善BER性能。通过使用发射分集可以进一步提高性能。在本文中，提出了联合发射分集和频域均衡，用于在频率选择衰落信道中接收正交多码DS-CDMA信号。关于发送分集，考虑了延迟发送分集（DTD）和频域空时发送分集（STTD）。通过计算机仿真评估了频率选择瑞利衰落信道中多码DS-CDMA可获得的BER性能。结果表明，与信道频率选择性的程度无关，频域STTD显着提高了BER性能，而DTD仅对弱频率选择性信道有用。

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