In fast fading channel environment, a commonly used channel estimation method is sub - block processing in TD-SCDMA system. This method can track the fast fading channel accurately. However, it does not consider the interference caused by multi-path effests between the adjacent sub-blocks. This paper presented an improved channel estimation method. Firstly, we estimated channel with traditional sub-block processing method, and then constructed the interference between adjacent sub-blocks, removed it from the received data, and finally did channel estimation again. Simulation results show that at the same bit error rate( BER) , the average needed signal to noise ratio (SNR) in the new method is l-2dB lower than that in literature [ 4 ] , whose channel estimation did not contain interference elimination.%在快衰落信道环境下,TD-SCDMA系统中一种常用的信道估计方法是子块处理法,该方法能准确地跟踪信道的快速变化.然而这种方法并没有考虑子块之间由多径引起的干扰.本文提出一种改进的信道估计方法,首先利用传统子块处理法进行信道估计,然后构造出相邻子块之间的干扰,从接收数据里去掉这些干扰,最后重新进行信道估计.仿真结果表明,本文提出的方法比文献[4]不进行干扰消除的子块处理法在同一误码率(BER)下,平均所需信噪比(SNR)降低1～2 dB.
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