Analysis of large MIMO DS-CDMA systems with imperfect CSI and spatial correlation
Analysis of large MIMO DS-CDMA systems with imperfect CSI and spatial correlation
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DOI：
10.1109/isit.2010.5513401
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
Mikko Vehkaperä;K. Takeuchi;R. Müller;Toshiyuki TANAKA
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文献类型：
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作者：
Mikko Vehkaperä;K. Takeuchi;R. Müller;Toshiyuki TANAKA
对随机扩频MIMO DS-CDMA系统进行了大系统分析。相关瑞利衰落MIMO信道假设为所有用户。采用线性多用户检测和导频辅助信道估计。结果表明，随着发射天线之间的相关性增加，信道估计的性能可以显着改善。在发射机处不需要信道信息，但是信道估计器需要预先知道长期发射相关性。数值结果表明，在4 × 4 MIMO DS-CDMA系统中，当发射端天线具有较高的相关性时，系统的各态历经频谱效率比发射端天线不相关时提高了一倍。
The large system analysis of randomly spread MIMO DS-CDMA systems is provided. Correlated Rayleigh fading MIMO channels are assumed for all users. Linear multiuser detection with separate decoding and pilot-aided channel estimation are used. The results imply that with channel estimation, the performance can improve significantly as the correlation between the transmit antennas increases. No channel information at the transmitter is required, but the channel estimator needs knowlegde of the long term transmit correlation in advance. The numerical results demonstrate that in a 4 × 4 MIMO DS-CDMA system with two users per chip, high antenna correlation at the transmitter can double the ergodic spectral efficiency compared to the case of uncorrelated transmit antennas.