平坦瑞利衰落環(huán)境下CDMA系統(tǒng)的多用戶(hù)檢測(cè)性能
PERFORMANCE OF MULTIUSER DETECTION FOR CDMA SYSTEM IN FLAT RAYLEIGH FADING ENVIRONMENT
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摘要: 在采用傳統(tǒng)信號(hào)檢測(cè)方式的CDMA無(wú)線通信網(wǎng)中,多址干擾限制了系統(tǒng)的容量和性能。多用戶(hù)信號(hào)檢測(cè)利用擴(kuò)頻碼互相關(guān)信息在高斯信道中可以減小或消除多址干擾,緩解遠(yuǎn)近效應(yīng),增加系統(tǒng)容量。本文將多用戶(hù)檢測(cè)器直接用于平坦瑞利衰落的CDMA環(huán)境中,用分析與仿真相結(jié)合的方法討論了典型多用戶(hù)算法的誤碼性能。結(jié)果表明,平坦瑞利衰落信道中多用戶(hù)檢測(cè)算法的性能仍然優(yōu)于傳統(tǒng)檢測(cè)算法。
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關(guān)鍵詞:
- 碼分多址; 瑞利衰落; 多用戶(hù)檢測(cè)
Abstract: In a CDMA wireless conmunication network using the conventional signal detection, the capacity of the system is limited and the performance is degraded by the multi-access interference (MAI). The multiuser signal detection, which make use of cross-correlation information between two spread spectrum codes, can reduce or eliminate the MAI in a Gaussian channel so as to mitigate the near-far effects and increase the system capacity. This paper extends the multiuser detector to the flat Rayleigh fading CDMA environment and discusses the bit error rate of typical multiuser detection algorithms in such a environment by combining analysis and simulation. It is concluded that the multiuser detection is superior to conventional detections in the flat Rayleigh fading channels. -
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