摘要
本文介绍了基于导频的OFDM系统信道估计的基本方法,并给出在不同估计准则、不同导频图案下,信道估计性能的对比分析。采用广义平非相关散射下的多径时变瑞利信道模型,对各个算法进行仿真,得出不同算下信道估计的均方误差曲线。仿真结果表明:在快变信道中,梳状导频较块导频有更好的性能;基于MMSE准则的信道估计比基于LS准则的估计有更的性能,但前者复杂度较高。
In this paper, pilot- aided channel estimation methods in OFDM systems under different rules and distributions are presented. We analyzed and simulated the methods in the time -raring muhipath Rayleigh - fading model, and compared their performance according to mean square error. The result showed that when in fast fading channel, comber pilot is better than block pilot; method based on MMSE is better than LS method, although former one will take complexity.
出处
《中山大学研究生学刊（自然科学与医学版）》
2007年第2期83-90,共8页
Journal of the Graduates Sun YAT-SEN University(Natural Sciences.Medicine)
