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文章针对MIMO-OFDM系统中的信道估计关键技术提出了一种信道估算方法——基于线性非冗余预编码和二阶统计量的信道盲估计算法,该算法利用预编码信号的二阶统计特性消除了调制信号的信息,然后又利用STBC(Space-Time Block Coding空时分组编码)特殊的复正交特性对参考子载波信道矩阵进行变换,将求逆过程转换成简单的线性处理过程,从而实现了低复杂度的信道估计。另外,该算法通过选取合适长度的统计数据,能够较快收敛。
Aiming at the key techniques of channel estimation in MIMO-OFDM system, a channel estimation method based on linear non-redundant precoding and second-order statistics is proposed. The algorithm uses the second-order statistics of the precoded signal Then cancels the information of the modulated signal and then transforms the reference subcarrier channel matrix by using the special complex orthogonality of STBC (Space-Time Block Coding) to convert the inversion process into a simple linear process, thereby A low complexity channel estimation is achieved. In addition, the algorithm can converge faster by selecting the appropriate length of statistical data.