Multipath combining/cancelling DS spread spectrum detection

Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI:10.1109/ACSSC.1997.680556

P. Flikkema

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引用次数: 1

Abstract

The additional dimensionality and bandwidth of direct-sequence spread spectrum signaling can be used to provide multiple access and exploit multipath in wireless communication. However, the severely spread channels that will be encountered in broadband wireless applications, combined with bandwidth limitations, motivates the use of additional receiver processing to provide improved performance at moderate spreading gains. Spread spectrum with simultaneous RAKE combining and ISI cancellation is explored. A received signal model is presented that captures the general time-varying multipath/multi-user case. Linear detectors are studied; in particular, results are shown for a correlation detector supplying tentative decisions to a RAKE detector working in tandem with a decision feedforward/feedback structure. The performance of this method is compared with both classical RAKE detection and a RAKE performance bound. The results show significant gains for typical multipath channels and suggest directions for further study of joint spread-spectrum and symbol-rate receiver processing.

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多径合并/对消DS扩频检测

利用直接序列扩频信令的额外维数和带宽，可以在无线通信中提供多址和利用多径。然而，在宽带无线应用中会遇到严重的扩频信道，再加上带宽限制，促使使用额外的接收器处理，以在适度的扩频增益下提供改进的性能。探讨了同时进行RAKE合并和ISI抵消的扩频。提出了一种捕获一般时变多径/多用户情况的接收信号模型。研究了线性检测器;特别地，给出了向与决策前馈/反馈结构协同工作的RAKE检测器提供试探性决策的相关检测器的结果。将该方法的性能与经典的RAKE检测和RAKE性能边界进行了比较。结果表明，在典型的多径信道上取得了显著的增益，并为进一步研究联合扩频和符号速率接收器处理提供了方向。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)

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