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分析了基站综测仪中定时误差对EVM测量值的影响,研究了通用的平方律定时误差恢复算法和Garden算法.结合CDMA2000系统,提出了基于数据辅助联合PN同步的定时误差恢复算法(CM-DA).该算法利用PN同步的相关峰值进行误差估计,提高了相关计算值的利用率,节省了计算量,算法精度高于通用算法.通过系统仿真,该算法定时误差恢复的性能能够满足对综测仪EVM参数精度的要求.
The influence of timing errors in base station tester on the EVM measurements is analyzed and the general square-law timing error recovery algorithm and Garden algorithm are studied.With the CDMA2000 system, a timing error recovery algorithm based on data aided and PN synchronization (CM- DA) .The algorithm uses the correlation peak of PN synchronization to estimate the error, improves the utilization of the related calculation, saves the calculation and the accuracy of the algorithm is higher than that of the general algorithm.Through the system simulation, the performance of timing error recovery of the algorithm can meet the requirement of Comprehensive EVM parameter accuracy requirements.