电光与控制, 2016, 23 (4): 85, 网络出版: 2016-09-12
同频同调制通信信号的卷积混合单通道盲分离
A Single-Channel Convolutive Blind Separation Algorithm to Communication Signals with Same Carrier Frequency and Modulation
摘要
针对单通道的同调制方式、同调制参数的时频重叠信号的盲分离问题,提出了一种新的卷积混合盲分离算法。首先,基于时间分集的过采样技术的信道多样性性质,将单通道混叠的MISO模型转化为多通道混叠的MIMO模型进行研究。然后,结合MIMO模型混叠矩阵的结构特点,讨论了混叠信号分量的时延差对MIMO模型混叠矩阵结构和混叠矩阵秩的影响。最后,数学推导证明:当信号分量时延差为符号速率的整数倍时,从信号时延的角度来讲混叠信号不具有盲可分离性,并通过仿真实例予以验证。
Abstract
Considering the blind signal separation problem of the convolutive mixture communication signals with same carrier frequency and modulation by a single channel,a new algorithm was presented for convolutive blind signal separation.Firstly,a single channel mixing signal model of MISO was transformed into a multi-channel mixing signal model of MIMO,based on the characteristics of oversampling.Then,the influence of the time-delay differences between mixing signal components to the structure and rank of mixing matrix of MIMO was studied.Finally,mathematical derivation proved that:if the time-delay difference between mixing signal components was the integral multiples of symbol velocity,the mixing signal is not blindly separable.And simulation results showed the validation of the algorithm.
吴芳, 高青伟, 吴铭, 芮国胜. 同频同调制通信信号的卷积混合单通道盲分离[J]. 电光与控制, 2016, 23(4): 85. WU Fang, GAO Qing-wei, WU Ming, RUI Guo-sheng. A Single-Channel Convolutive Blind Separation Algorithm to Communication Signals with Same Carrier Frequency and Modulation[J]. Electronics Optics & Control, 2016, 23(4): 85.