OFDM系统导频信道估计算法的性能研究

Study of Pilot-based Channel Estimation in OFDM System

研究基于块状导频的最小平方(LS)信道估计、线性最小均方误差(LMMSE)和低秩LMMSE信道估计算法,并进行了算法仿真,得出不同信道估计算法下正交频分复用(OFDM)系统误比特率(BER)和信噪比(SNR)之间的变化关系,以及在不同导频符号间隔下的误比特率曲线图。仿真结果表明:LMMSE、低秩LMMSE和LS算法的性能依次变差,且导频符号间隔对误比特率性能影响较大。

This paper describes the study of LS,LMMSE and Low-rank LMMSE channel estimation algorithm based on block pilot,including the algorithm simulation with MATLAB.Thus the change relationship between bit error rate and signal to noise ratio for different channel estimation algorithms and the bit error rate curve under the different space of pilot symbol are obtained.Simulation results show that the performance of LMMSE,Low-rank LMMSE and LS is in sequential degradation,and the impact of pilot symbol space on bit error rate performance is fairly strong.