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首页> 美国政府科技报告 >Transmitter-Based Multiple Access Interference Rejection and Diversity Techniques for Code-Division Multiple Access Systems
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Transmitter-Based Multiple Access Interference Rejection and Diversity Techniques for Code-Division Multiple Access Systems

机译：基于发射机的多址干扰抑制和码分多址系统的分集技术

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摘要

For the downlink of direct sequence code-division multiple access (DS-CDMA) systems, transmitter (Tx)-based multiple access interference (MAI) cancellation techniques, termed multiuser precoding, and Tx-based diversity techniques can significantly increase system capacity while remaining low complexity at mobile stations (MS). We have proposed novel linear and nonlinear decorrelating precoding algorithms. Hybrid transmitter designs were developed to combine MAI cancellation and diversity techniques. We have also analyzed the important duality between Tx-based multiuser precoding and receiver (Rx)-based multiuser detection. The class of decorrelating precoding techniques is simple, efficient and satisfies the minimum mean square error (MMSE) criterion. The nonlinear decorrelating Tomlinson-Harashima precoding (THP) inherently outperforms linear MAI cancellation methods. For frequency-selective fading channels, we developed the THP with Pre-RAKE combiner (PreRAKETHP) and Multipath Decorrelating THP (MDTHP) designs. While the PreRAKETHP is the optimal THP design by both ZF and MMSE criteria, it is computationally complex because the MAI cancellation filters depend on the instantaneous channel gain coefficients and therefore need to be updated frequently. In the MDTHP, the precoding filter is independent of the channel state information (CSI). The MDTHP is simpler than PreRAKETHP at the expense of moderate performance loss.

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