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文章针对盲多用户检测中信道阶数与在线用户个数未知的问题,提出一种仅利用单路观测信号的盲信道阶数与在线用户个数估计算法。首先利用串并变换将单路观测信号转换为多路观测信号,然后利用多路观测信号协方差矩阵的信号子空间个数与信道阶数以及在线用户个数之间的关系估计得到信道阶数以及在线用户个数。仿真结果表明该算法在低信噪比条件下具有较好的性能,但其性能随着信道阶数的增加逐步恶化。
In order to solve the problem of unknown channel number and number of online users in blind multiuser detection, this paper proposes an algorithm to estimate the number of blind channels and the number of users on a single channel. Firstly, the single observation signal is converted into multiple observation signals by using the serial-parallel transform. Then, the channel order is estimated by using the relationship between the number of signal subspaces of the multiple observation signal covariance matrix and the channel order and the number of online users As well as the number of online users. The simulation results show that the proposed algorithm has better performance under low signal-to-noise ratio, but its performance deteriorates gradually with the increase of channel order.