非精確信道信息下的自適應(yīng)MIMO-OFDM系統(tǒng)性能分析
Performance Analysis of Adaptive MIMO-OFDM System with Imperfect Channel Information
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摘要: 由于自適應(yīng)多入多出正交頻分復(fù)用系統(tǒng)(MIMO-OFDM)可以大大提高系統(tǒng)的頻譜效率，已經(jīng)成為人們研究的熱點，該文分析并討論了自適應(yīng)MIMO-OFDM系統(tǒng)中導(dǎo)致非精確信道信息的兩個主要因素信道估計誤差和信道信息時延對系統(tǒng)的頻譜效率和誤碼率性能的影響。仿真結(jié)果表明，在22 MIMO-OFDM系統(tǒng)中，當(dāng)信道估計誤差小于-12dB時，系統(tǒng)頻譜效率損失很小。此外信道預(yù)測可以大大降低系統(tǒng)對信道信息時延的敏感程度。
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關(guān)鍵詞:
- 正交頻分復(fù)用;自適應(yīng);多入多出;頻譜效率
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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