基于联合检测的TD-SCDMA系统的频偏估计算法

摘要

对于在已经投入运行的高铁列车环境下，TD-SCDMA系统通过midamble码进行频偏估计的方法已经无法实现信号的正确解调的问题，提出了一种TD-SCDMA系统的多普勒频偏估计方法。该方法基于联合检测，在用训练序列进行频偏估计补偿的基础上再利用联合检测得到的检测数据进行二次频偏估计。通过仿真对比，在相同信噪比的条件下，该算法比传统的只利用训练序列进行估计补偿的算法有更低的误码率。%Already been put into operation for high-speed rail train environment, TD-SCDMA system, through the midamble codes shift estimation approach has been unable to achieve the correct signal demodulation problem. This paper proposes a method based on combination of detection using data ifelds of td-scdma system of doppler frequency shift estimation method,, using the training in frequency estimation sequences of compensation based on joint detection test data for secondary frequency estimation compensation. Through simulation, in the same SNR conditions, this algorithm has low probable of error than the traditional algorithm using the training sequences to estimate.