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首页> 外文期刊>IEEE Transactions on Vehicular Technology >On the Transmitter-Based Preprocessing for 2-D OFDM-CDMA Forward-Link Systems Over Time-Varying Rayleigh Fading Channels
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On the Transmitter-Based Preprocessing for 2-D OFDM-CDMA Forward-Link Systems Over Time-Varying Rayleigh Fading Channels

机译:基于时变瑞利衰落信道的2-D OFDM-CDMA前向链路系统基于发射机的预处理

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摘要

Transmitter-based preprocessing is investigated for 2-D orthogonal frequency-division multiplexing code-division multiple-access (OFDM-CDMA) forward-link systems for improving performance and shifting signal processing complexity from a mobile unit to a base station. Preprocessing schemes that are based on zero forcing (ZF) with power normalization, minimum mean square error (MMSE), and ZF with multiuser water filling (ZF-MWF) criteria are jointly investigated with 2-D spreading pattern optimization and multiuser scheduling from an information-theoretic viewpoint. Numerical results show that 1) the performance of preprocessing is quite sensitive to the 2-D spreading pattern for SNRs of interest, for example, 20% degradation on the sum data rate is observed for MMSE preprocessing if the spreading pattern is not properly selected; 2) ZF-MWF may substantially outperform the other two criteria depending on the SNRs; and 3) multiuser scheduling provides a significant performance improvement on the system sum data rate.
机译:针对2-D正交频分复用码分多址(OFDM-CDMA)前向链路系统,研究了基于发射机的预处理,以改善性能并将信号处理复杂性从移动单元转移到基站。结合二维扩展模式优化和多用户调度,联合研究了基于零归零(ZF)和功率归一化,最小均方误差(MMSE)和多用户注水(ZF-MWF)标准的ZF预处理方案。信息理论观点。数值结果表明:1)对于感兴趣的SNR,预处理的性能对2-D扩展模式非常敏感,例如,如果扩展模式选择不当,则MMSE预处理的总数据速率会降​​低20%; 2)根据SNR,ZF-MWF可能明显优于其他两个标准; 3)多用户调度可显着提高系统总数据速率的性能。

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