比特谱相关改进循环谱的单通道混合信号参数估计快速算法

Parameter Estimation of Mixed Signals in Single-Channel on Modification Fast Cyclic Spectral Estimation Algorithm with One-Bit Spectral-Correlation

为了应对复杂环境下非合作通信、电磁频谱监管等宽带接收中存在的先验信息缺失,针对单通道混合信号的参数盲估计问题,提出了一种基于比特谱相关算法改进循环谱估计的快速算法。针对信号集{BPSK、QPSK、OQPSK、8PSK、8QAM、16QAM、16APSK、32APSK、CPM},系统给出整套参数估计算法流程,通过高阶累积量以及功率中心方法确定信号个数以及载波频率,然后利用改进循环谱提取符号速率谱线,完成单通道混合信号参数估计。论文对改进算法的统计特性进行了理论推导。理论和实验表明:算法不需要同步码等先验信息,适用于高斯噪声信道和多径平坦衰落信道,同时降低了计算复杂度、存储空间、估计方差以及数据量的需求,当混合信号等功率混合时,且信噪比分别为-4 d B和-1 d B时,算法对载波频率和符号速率的估计正确率可以达到90%,验证了算法的有效性和可行性。

In response to the challenge of the complex environment such as non-cooperative communication and wideband electromagnetic spectrum regulation,where existing missing priori information,in view of blind parameters estimation problem of mixed signal in the single channel,this paper presents an algorithm based on improved fast cyclic spectrum estimation with one bit spectral correlation. Aiming at signal set { BPSK、QPSK、OQPSK、8PSK、8QAM、16QAM、16APSK、32APSK、CPM},we propose complete algorithm flow of parameter estimation,which computing high cyclic cumulant and center of power spectrum so as to decide number and carrier frequency of mixed signals,then extracting the peak of symbol rate with proposed cyclic spectrum,finally accomplishing parameter estimation of mixed signals in single channel. Paper proves the statistical features of improved algorithm theoretically. The theoretical analysis and simulation results prove that：The algorithm does not require a priori information such as synchronization code,and suit for Gaussian noise and multi path flat fading channel,even reduce the computer complexity,storage space,estimation variance and data quantity requirement. when the mixed signals are same power,carrier frequency and symbol rate estimation correct rate are both more than90% when the SNR is- 4 d B or- 1 d B respectively,verifying the feasibility and effectiveness of the algorithm.