基于网格搜索的同步损伤和信道联合估计算法

Joint estimation algorithm for synchronous damage and channel based on grid search

摘要:

为了实现多输入多输出(MIMO)正交频分复用(OFDM)系统中同步损伤和信道的联合估计，提出了一种基于网格搜索的联合估计算法。首先通过构建起一个以反映同步损伤和信道响应影响的系统模型，然后将各损伤参数估计的多维优化问题简化为二维网格和一维网格搜索，从而实现对载波频率偏移、采样频率偏移和符号定时误差的联合估计；数值仿真结果表明，本文提出的联合估计算法相比于非联合估计算法具有更好的估计性能。

Abstract:

A joint estimation algorithm based on grid search is proposed in order to realize the joint estimation of synchronous damage and channel in Multiple Input Multiple Output(MIMO)-Orthogonal Frequency Division Multiplexing(OFDM) system. Firstly, by constructing a system model to reflect the influence of synchronous damage and channel response, the multi-dimensional optimization problem of each damage parameter estimation is then simplified into two-dimensional grid and one-dimensional grid search, so as to realize the joint estimation of carrier frequency offset, sampling frequency offset and symbol timing error. The numerical simulation results show that the proposed joint estimation algorithm has better estimation performance than the non-joint estimation algorithm.