一种新型改进的B.Steiner信道估计算法

A NEW IMPROVED B.STEINER CHANNEL ESTIMATION ALGORITHM

为了克服目前改进的B.Steiner信道估计法受加性噪声的影响,理论上分析了改进的B.Steiner信道估计方法能够去除噪声径的原因,提出一种新型改进的B.Steiner信道估计方法。该方法通过设定适当的门限值,对B.Steiner信道估计结果进行修正。首先去除上述估计结果中的噪声径,然后消除保留径中噪声的影响,得到最终信道估计结果;与原改进方法相比,所提出的方法能有效地去除保留径中的噪声。在TD-SCDMA系统专用测试模型case 3的条件下进行仿真实验,结果表明:信号误码率一定时,系统所需的输入信号信噪比降低1 dB;并且该方法并不明显增加运算量,在门限处理的基础上主要增加了减法运算,并且减法运算的次数不超过KW次(其中K为用户数,W为信道冲击响应窗长)。

We propose a new improved B. Steiner channel estimation method to overcome the additive noise influence on existing improved B. Steiner channel estimation method by analysing on theory the cause of this method being able to remove the noise path. By setting appropriate threshold value, we correct the B. Steiner channel estimation results, first we discard the noise path in above estimation results, and then clear up the influence of noise in reserved path, what obtained is the final channel estimation result. Comparing with the original improved methods, the proposed method can effectively remove the noise in reserved path. Simulation experiment is carried out under the condition of specific test model case 3 of TD-SCDMA system, the results demonstrate that when there is certain signal error rate, the signal-noise ratio of the input signal the system required reduces 1 riB. In addition, this proposed method does not noticeably increase the computation load, it just adds the subtraction operation based on threshold processing main!y, and the times of subtraction operation does not exceed KW （where K is users number, while W is the window length of channel impulse respondenee）.