无线移动通信系统中提高信道估计精度盲方法

Blind scheme for channel estimation with high accuracy

基于多载波正交频分复用(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。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,克服了常规递归最小二乘(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,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 least mean square （LMS） scheme was proposed. The new scheme could trace the channel characteristic adaptively through time-variance gain design. And the decision information function in receiver was also adopted to correct the gain. Simulation shows that the new scheme has better performances with high accuracy and fast convergence than that of the LMS method, in terms of different time delay spread, time and signal noise rate （SNR）.