空时分组码参数分析

Parameter Analysis of Space-Time Block Code

在协议未知的条件下仅根据接收信号分析得到空时码的参数是MIMO系统盲接收中的重要技术.基于此应用背景对空时分组码的编码模型和接收信号模型进行研究,发现接收信号协方差矩阵的秩与空时分组码参数之间的关系,并由此利用随机矩阵理论的中噪声子空间最大特征值的概率分布求出信号协方差矩阵的秩,进而估得空时码参数.仿真结果表明,算法在未知码集的条件下不仅能够估计出空时分组码的码参数,还能够确定空时分组码的码块起点.

When the protocol of the communication system is unknown,the analysis of space-time block code parameter is a key research issue for blind receive of Multiple Input Multiple Output signals. Under the circumstance,the model of space-time block code and the receiving signal model are discussed. The relationship between the rank of covariance matrix of receiving signals and the code parameter is revealed. Making use of the distribution of maximum eigenvalue of noise subspace in random matrix theory,the rank of covariance matrix could be exactly estimated,and then the code parameter could be obtained. Simulation results showthat the proposed algorithm could not only estimate the space-time block code parameter,but also recognize the first symbol of the code under the condition of unknown code set.