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该文对基于802.16d/e实现的MIMO-OFDMA系统模型的信道估计算法进行了研究,提出了已知信道估计设计的一种基于时-频域分析法的实现方案。在该方案下的性能可以作为衡量其它信道估计算法性能的一个参考基准,并根据OFDMA系统上行链路的导频分布特点,利用导频进行线性插值信道估计的LSE信道估计,测试结果表明无论对于何种情况,已知信道估计的都优于线性插值信道估计,SUI-1情况中当SNR大于7dB后,线性插值信道估计与已知信道估计的性能差距超过2dB,其它SUI情况性能差距不超过2dB。
In this paper, the channel estimation algorithm of MIMO-OFDMA system based on 802.16d / e is studied, and a scheme based on time-frequency analysis of channel estimation is proposed. The performance under this scheme can be used as a reference to measure the performance of other channel estimation algorithms. According to the pilot distribution characteristics of uplink in OFDMA system, LSE channel estimation using pilot channel for linear interpolation is performed. The test results show that, In any case, the known channel estimation is better than linear interpolation channel estimation. When the SNR is greater than 7dB in SUI-1 case, the performance difference between the linear interpolation channel estimation and the known channel estimation exceeds 2dB, and the performance gap of other SUI cases does not exceed 2dB.