变换域通信系统信号基函数的盲同步估计方法

Approach to blind synchronization estimation of the basis local function in transform domain communication system signals

为了解决当收发两端频谱环境不一致时,变换域通信系统(TDCS)基函数序列的盲同步估计问题,文章提出了一种TDCS信号盲同步的改进算法。相比于传统的基于F_范数盲同步法系统性能明显改善。将接收到的TDCS信号进行周期分段以形成连续多个观察向量,分段向量通过改进算法估计采样延时。同步后将接收信号按基函数周期分段得到分段向量,求协方差矩阵并累加平均,最后通过特征值分解法得到最大特征向量即估计的基函数序列。仿真结果表明:估计的基函数相关解调接收信号得到的误码率与收发两端基函数一致条件下的误码率基本一致。

In order to solve the problem of local basis function sequence synchronization estimation blindly when spectrum environment of sending and receiving ends is inconsistent in transform domain communication system（TDCS）. In this paper, an improved algorithm for blind synchronization of TDCS signals is proposed. Compared with the traditional F_ norm based blind synchronization method, the performance of the system is significantly improved. The received TDCS signals were divided into continuous multiple observation vectors based on the cycle of basis local function, segmented vectors by cross-correlation method to estimate the sampling time delay. The received TDCS signals were divided into vectors according to the cycle of basis local function after the synchronization, and then the covariance matrix of the signal vectors was analyzed using the eigenvalue decomposition method to get the largest eigenvector which was the estimated basis function sequence. The simulation results show that estimated basis function correlation demodulation receiving signals to get the bit error rate is consistent with bit error rate of the sending and receiving ends basis function under the same condition.