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提出一种多径平坦衰落信道下的盲信噪比估计方法.该算法首先利用数字通信信号的循环平稳统计特性构造接收信号的循环自相关矩阵,然后对该矩阵进行奇异值分解,由分解出的特征值信号子空间和噪声子空间,最后通过利用AIC信息准则分别估计信号子空间和噪声子空间的维数并最终估计出信道的平均信噪比.以MPSK信号为例进行了计算机仿真,结果表明了算法的有效性.
This paper proposes a blind signal-to-noise ratio estimation method under multi-path flat fading channel.The algorithm constructs the cyclic autocorrelation matrix of received signal by using the cyclostationarity statistic of digital communication signal, and then decomposes the matrix by singular value decomposition The eigenvalue signal subspace and the noise subspace are estimated.At last, the dimension of the signal subspace and the noise subspace are estimated respectively by using the AIC information criterion and the average signal-to-noise ratio of the channel is finally estimated.The MPSK signal is taken as an example to carry on the computer simulation, The results show the effectiveness of the algorithm.