MIMO-OFDM系统下新型联合载波频偏估计方法

A Joint Carrier Offset Estimation Algorithm Based on MIMO-OFDM System

为了降低多输入多输出正交频分复用(MIMO-OFDM)无线通信系统的符号间干扰并改善系统对频率偏移和定时的敏感,提出一种联合载波频偏估计算法.采用灵活分割相关及最小均方误差准则改进传统载波频率估计算法,实现了基于MIMO-OFDM无线通信系统的精确频偏估计.分析和仿真结果表明,本算法能在信道状况较差情况下实现均方误差估计性能10-6以下,适用于MIMO-OFDM无线通信系统.

A joint carrier offset estimation algorithm is proposed to combat the severe inter-symbol inter- ference and sensitivity to the frequency and timing offset of multiple input multiple output （MIMO） or- thogonal frequency division multiplexing （OFDM）wireless communication system. The proposed algo- rithm of carrier offset using flexible correlation and minimum mean square error （MMSE） rule improves the traditional carrier synchronization effects dramatically and has achieved precise estimation performance in the wireless MIMO-OFDM system structure. Analysis and simulations show that, the mean-square error estimation performance of the proposed algorithm can achieve 10-6 under a poor channel circumstance, which reveals that the joint estimation carrier frequency algorithm is suitable for the frequency bias esti- mation of wireless MIMO-OFDM communication system.