MIMO-OFDM信道估计仿真实现

Simulation Realization of MIMO-OFDM Channel Estimation

正交频分复用(OFDM)可以有效地将频率选择性衰落信道转化成多个并行平坦衰落信道,从而大大提高传输效率。多输入多输出正交频分复用(MIMO-OFDM)技术可以大幅度地提高无线通信系统的信道容量与传输速率,其信道估计精度对系统性能有着直接的影响。研究了基于导频插入的SISO-OFDM和MIMO-OFDM最小二乘法估计(LS)信道估计方法。采用广义平稳非相关散射下的多径时变瑞利信道模型,对各个算法进行了仿真试验,得出不同算法下信道估计的误比特曲线,比较了各个算法的性能。仿真结果表明:MIMO-OFDMLS算法在误码率性能上优于SISO-OFDM。

With the parallel modulation,orthogonal frequency-division multiplexing（OFDM） could effectively change the frequency selective fading channel into multiple parallel flat fading channels,thus greatly improving the transmission efficiency.Multiple input multiple output-orthogonal frequency division multiplexing（MIMO-OFDM） technology could tremendously raise the transmission rate and the capacity of wireless communication system,and the accuracy of channel estimation has a direct influence on the performance of MIMO-OFDM systems.This paper describes SISO-OFDM and MIMO-OFDM LS（least square） channel estimation algorithms based on block-type pilot assignment.With the time-varying Rayleigh multipath channel model under the broad-sense uncorrelated scattering,those algorithms are simulated.And the simulation results show that the BER（bit error rate） performance of MIMO-OFDM is better than that of SISO-OFDM.