高精度无线移动通信信道盲估计方法

The blind scheme for channel estimation with high accuracy

基于多载波OFDM系统,提出了一种新的时变步长修正软加权判决递归二乘信道估计盲方法(TVCPMSDWRLS)。该法通过对常规算法步长进行自适应的科学设计以便跟踪信道特征变化,同时利用接收机判决信息函数修正权系数,解决了常规RLS盲方法收敛速度慢、信道估计性能不高的缺点。仿真证明:对于不同的时延扩展、时间以及信噪比(SNR),该法均表现出比常规方法更优的性能。同时,该法亦可用于估计通信、雷达、航天等领域的其他特征参数。

A blind channel estimation scheme, named as time-variance convergence parameter and correct soft decision weight RLS （TVCPMSDWRLS） method, based on orthogonal frequency division multiple （OFDM） systems was proposed. The novel scheme could trace adaptively the channel characteristic through special time-variance gain design. And the decision information function in receiver was also adapted to correct the gain. Simulation showed that the novel scheme had better performances with high accuracy and fast converges than that of the RLS method, especially via different time delay spread, time and SNR. Furthermore, the scheme can also suitable in the other areas such as communication, Radar, spaceflight to estimate the other characteristic parameters.