TD-SCDMA系统中的载波频率估计方法

Carrier frequency offset estimation algorithm for TD-SCDMA systems

提出了一种用于TD-SCDMA系统的频率估计方法,该算法利用TD-SCDMA系统中的导频序列,通过最大似然函数进行数值估计,并且利用一系列的频率自动调整策略使估计值较为准确、较为收敛。在AWGN和多径条件下的仿真结果均表明,该算法具有比较理想的估计准确度和稳定性,尤其是结合使用自动调整策略算法后,该算法具有更优的估计性能,这说明该算法十分适合应用于TD-SCDMA通信系统中。

A frequency offset estimation algorithm was proposed for TD-SCDMA systems, which exploited the Sync_DL codes and the maximum likehood （ML） algorithm to get the estimation value, and used a series of methods for automatic adjusting of the value and obtained the more accurate and convergent frequency offset value. Simulations proves that this algorithm have performed well both in additive white Gaussian noise （AWGN） and multi--path fade channel in TD-SCDMA systems.