一种OFDM系统中叠加导频的信道估计方法

摘要

要提出了一种新的基于叠加导频的信道估计算法。利用循环序列频域能量集中在某些频点上的特点，消除未知传输数据对导频的影响，将导频完全从接收数据中分离出来。在此基础之上，结合PN序列的自相关特性，在时域进行信道估计，进一步降低了噪声对导频的影响。仿真结果表明，与传统方法相比，该方法不但误码率和均方误差更低，而且还具有计算复杂度低、频带利用率高的特点。%In this paper a novel superimposed pilot channel estimation method is proposed, which extracts the pilot from unknown data completely according to the character that the energy of periodic sequence mainly concen- trates on a few frequency points. Based on the auto-correlation of PN sequence, the impact of noise on pilot is further reduced in time domain, which increases the accuracy of channel estimation efficiently. The extensive experiment re- sults show that proposed algorithm has the＇high bandwidth efficiency, the performance of which is superior to other existing algorithms.