非精确信道信息下的自适应MIMO-OFDM系统性能分析
Performance Analysis of Adaptive MIMO-OFDM System with Imperfect Channel Information
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摘要: 由于自适应多入多出正交频分复用系统(MIMO-OFDM)可以大大提高系统的频谱效率，已经成为人们研究的热点，该文分析并讨论了自适应MIMO-OFDM系统中导致非精确信道信息的两个主要因素信道估计误差和信道信息时延对系统的频谱效率和误码率性能的影响。仿真结果表明，在22 MIMO-OFDM系统中，当信道估计误差小于-12dB时，系统频谱效率损失很小。此外信道预测可以大大降低系统对信道信息时延的敏感程度。
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关键词:
- 正交频分复用;自适应;多入多出;频谱效率
Abstract: As adaptive MIMO-OFDM system can greatly improve the spectral efficiency, many people are studying it. The imperfect Channel State Information (CSI), which is caused by two major factorschannel estimation error and CSI delay, and their impacts on the system frequency efficiency are studied. Simulation results show that the spectral efficiency loss due to channel estimation error is relatively small when the channel estimation error is less than-12dB and the system will be less sensitive to CSI delay when channel prediction is used. -
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