TD-SCDMA系统频偏估计算法

文章从估计范围、估计精度和运算复杂度等方面,对现有的5种频偏估计算法进行研究和仿真,给出了算法的选择依据和详细的分析结果.在此基础上,研究了利用差分相关法、基于TS0的Midamble码与SYNC-DL码的联合频偏估计算法,分析了估计范围和运算复杂度.通过仿真发现,该算法可以将频偏控制在±0.05×10-6之内,较好地实现了精确的频偏估计,解决了频偏估计精度不易提高的难题.

Frequency offset estimation algorithm for TD-SCDMA systems

From aspects of estimation range, estimation accuracy and calculation complexity, five existing frequency offset estimation algorithms are studies and emulated, and the basis of their selection and detailed analytical results given. On this basis, the joint frequency offset estimation algorithm for TSO-based Midamble code and SYNC-DL code is studied by using the differential correlation method and the estimation range and calculation complexity analyzed. It is found from emulation that frequency offset can be controlled within ±0.05×10-6 by using this algorithm and accurate estimation in the signal acquisition system well achieved.