TD-SCDMA系统中信道估计算法的性能分析及改进

Performance Analysis and Improvement of the Channel Estimation Algorithm in the TD-SCDMA System

TD-SCDMA系统中普遍采用Steiner信道估计算法,但是由于信道估计器受背景噪声的影响,会造成信道冲激响应的幅度和时延比真实值大。该文提出了两种对Steiner信道估计的改进方法,它们分别设定了一定的门限。仿真结果表明,通过这种处理,系统的输出性能得到明显改进。

The adoption of B. Steiner channel estimation algorithm is prevalent in TD-SCDMA system. However, the estimated channel impulse responses are affected by the noise in the channel, therefore their amplitudes and delays are larger than the real channel impulse responses. Two improved algorithms are proposed, both of which set gates for the channel impulse responses. The simulation results show that both the outputs of channel estimator and the system performance are improved by adopting the gate method.