一种OFDM系统中叠加导频的信道估计方法

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。

Channel Estimation Using Superimposed Training for OFDM System

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 concentrates 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 results show that proposed algorithm has the high bandwidth efficiency,the performance of which is superior to other existing algorithms.