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首页> 美国政府科技报告 >Performance of DS/SSMA (Direct-Sequence Spread-Spectrum Multiple-Access) Communications in Impulse Channels. Part 2. Hard-Limiting Correlation Receivers
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Performance of DS/SSMA (Direct-Sequence Spread-Spectrum Multiple-Access) Communications in Impulse Channels. Part 2. Hard-Limiting Correlation Receivers

机译：脉冲信道中Ds / ssma（直接序列扩频多址）通信的性能。第2部分。硬限制相关接收器

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In Part I of this paper, it was demonstrated that impulsive channel noise can be a serious detriment to the performance of direct-sequence spread-spectrum multiple-access (DS/SSMA) communications when conventional linear correlation reception is used. In this paper, we consider a hard-limiting correlator as an alternative for reception of multiple-access transmissions in impulsive channels. As with the previous study, we consider K asynchronous binary PSK DS/SSMA users sharing a linear channel corrupted by impulsive noise that is modeled at the output of the front-end filter of the receiver. We develop techniques for analyzing bit error probabilities of this hard-limiting receiver by exact computation for short spreading sequences, by approximation for longer spreading sequences, and by asymptotic limits for infinitely long spreading sequences. Performance is compared to that of the linear correlator under a variety of conditions, and it is seen that hard-limiting correlation reception can offer substantial improvement over conventional systems in impulsive channels. However, the linear receiver is more effective against multiple-access noise only, and so a tradeoff emerges in this problem between rejection of impulsive noise and rejection of multiple-access interference.

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