【摘要】 对正交频分复用(OFDM)系统中的两种导频辅助信道估计方法,即最大似然估计(MLE)和贝叶斯最小均方误差估计(MMSEE),在估计误差性能方面的特性进行了详尽的比较研究。理论分析及计算机仿真试验表明,当信道噪比较低时,MMSEE有比MLE更好的估计误差性能,但有比MLE复杂得多的计算复杂度。而当信道信噪比较高或插入导引符号序列数目足够多时,MMSEE与MLE误差估计性能基本一致。更多还原

【Abstract】 Two pilot-aided channel estimation methods in orthogonal frequeney division multiplexed(OFDM) systems,i.e.,the maximum likelihood estimator(MLE) and the Bayesian minimum mean square error estimator(MMSEE),are analyzed in detail in this paper.We focus on the performance in the error estimation of the two schemes.Theoretical analysis and computer simulations show that,at high SNR of practice interest,MMSEE and MLE have nearly equal error performances in channel estimation,provided that the number of pilots is sufficiently greater than the channel impulse response(CIR)length.Otherwise,the MMSEE is superior.In any case,MMSEE is more complex to implement.更多还原