OFDM系统中信道估计算法比较

Comparison of OFDM Channel Estimation Algorithms

对最小二乘算法和离散余弦变换算法这两种算法的原理进行详细的分析,并通过仿真对二者性能进行比较。结果表明:后者算法能较好地降低高斯白噪声的影响,相对于前者获得较大的性能增益。同时比较在不同导频数下离散余弦变换算法的性能,结果显示该算法的信道估计性能随导频数的增加得到改善,但增加运算复杂度。

Analyses the least square algorithm and Discrete Cosine Transform algorithm in details and compares their performance through the simulation. The results verify that the DCT-based LS estimator has a better performance for OFDM systems. Moreover, the effect of power limitation in terms of SNR and the number of pilots for a wireless channel is determined to compare the DCT-based LS estimator. The result indicates that the estimator with large number of pilots has better performance, but increases the computational complexity.