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研究了LDPC编码在MIMO-OFDM系统中的应用,提出了基于LDPC编码的MIMO-OFDM系统的一种改进判决反馈信道估计算法,该算法一方面利用多步预测和干扰对消技术改进了判决反馈算法的精度,另一方面利用空时解码后的序列和LDPC译码后的序列进行了两级反馈信道估计。该算法在利用LDPC码优异的低误码性能改善信道估计精度的同时,有效地改进了LDPC帧过长导致时变信道条件下的信道估计不精确的问题。
The application of LDPC coding in MIMO-OFDM system is studied. An improved decision feedback channel estimation algorithm for MIMO-OFDM system based on LDPC coding is proposed. On the one hand, the algorithm improves the decision feedback by using multi-step prediction and interference cancellation The accuracy of the algorithm, on the other hand, two-stage feedback channel estimation is performed by using the space-time decoded sequence and the LDPC decoded sequence. This algorithm improves the channel estimation accuracy by utilizing the excellent low bit error performance of LDPC codes and effectively improves the inaccuracy of channel estimation under the condition of time-varying channel due to the long LDPC frame.