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文中分析了MC-CDMA下行传输系统在非理想信道估计下MMSE预均衡性能恶化的原因,提出一种改进的MMSE预均衡方法。相对于传统MMSE预均衡,改进的MMSE预均衡方法可以抑制信道估计误差对MC-CDMA下行传输的性能影响。研究结果表明,这种改进的预均衡可以消除信道估计误差带来的误比特率信噪比增加而增加的反常现象。
In this paper, we analyze the reason why MMSE pre-equalization performance is deteriorated under the non-ideal channel estimation in MC-CDMA downlink transmission system and propose an improved MMSE pre-equalization method. Compared with the traditional MMSE pre-equalization, the improved MMSE pre-equalization method can restrain the performance impact of the channel estimation error on the MC-CDMA downlink transmission. The results show that this improved pre-equalization can eliminate the anomalous phenomenon caused by the increase of signal-to-noise ratio of bit error rate caused by channel estimation error.