基于酉差分空时码的信道估计性能研究

Unitary Differential Space-time Codes Based on the Channel Estimation Performance Study

介绍MMSE和LS算法的基本原理同时给出酉空时码的编解码原理,对基于OFDM的非盲信道估计与基于酉差分空时码的盲信道估计进行性能的仿真对比。其中非盲信道估计采用MMSE和LS算法,盲信道估计采用极大似然算法,通过误码率仿真曲线对比可以看出采用酉空时码的误比特率在大信噪比的环境下要明显好于采用MMSE和LS;而在小信噪比环境下,酉空时码的误码率与采用LS的信道估计的误码率基本一致。

The MMSE and the LS algorithm,are firstly introduced and given the basic principle of unitary space-time codes decoding principles,and then OFDM-based non-blind channel estimation and unitary differential space-time codes based on blind channel estimation are used to compare the simulation.One non-blind channel estimation using the MMSE and the LS algorithm,blind channel estimation using maximum likelihood algorithm,BER simulation curves can see that use of unitary space-time codes bit error rate environment in large signal to noise ratio is significantly better than the use of MMSE and the LS,while in low SNR environment,the unitary space-time codes using bit error rate and the LS channel estimation error rate basically the same.