多徑衰落下多天線CDMA系統(tǒng)信道容量研究
Capacity of Multi-antenna CDMA System under Multipath Fading Channels
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摘要: 該文對(duì)準(zhǔn)靜態(tài)Rayleigh衰落下MIMO-CDMA系統(tǒng)信道容量進(jìn)行了研究，分析了擴(kuò)頻碼為Walsh函數(shù)，基于多碼檢測的極大似然檢測器(MLD)和解相關(guān)檢測器的性能，并和MMSE多用戶檢測器(MUD)進(jìn)行了比較；分析了對(duì)不同檢測器在一定的信噪比下系統(tǒng)天線數(shù)目和信道容量的關(guān)系。仿真結(jié)果表明：在相同的情況下，基于Walsh碼CDMA系統(tǒng)容量按MUD、干擾方差已知的MLD，干擾方差未知的MLD和解相關(guān)檢測器遞減，并且后面的3種檢測器在大信噪比的時(shí)候均有漸進(jìn)的平臺(tái)效應(yīng)；在信噪比較大且一定時(shí)，CDMA系統(tǒng)信道容量與天線數(shù)目呈線性關(guān)系。
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關(guān)鍵詞:
- MIMO信道容量;多徑衰落;Walsh函數(shù)
Abstract: The performance of Maximum Likelihood Detector (MLD), decorrelating detector which based on multi-code detections and MMSE Multi-User Detector(MUD) of MIMO CDMA system under Rayleigh fading channels were analyzed in the paper. The relation between the number of antennas and system capacity at a given SNR was also analyzed. The numerical results present that the capacity is degressive for MMSE MUD, MLD with interference covariance known, MLD with interference covariance unknown, and decorrelating detector, furthermore the three latter detectors all have platform as SNR is large; at a given SNR, the relation of system capacity and the number of antenna is linear for a NN system. -
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