TD-LTE系统中PSS频域快速同步算法

符号定时同步作为TD-LTE(Time Division-Long Term Evolution)系统重要的部分,应该具有很好的抗频偏性和高效性。本文在已有的PSS(Primary Synchronous Signal)定时同步算法的基础上,结合主同步信号自身的良好互相关性,给出了一种具有更低时间复杂度和高抗频偏性能的PSS定时同步算法。基于快速卷积与重叠相加法的频域快速同步方法,结合预频偏处理,进行符号定时同步与粗频偏的联合估计。理论分析表明,该方案减小了PSS定时同步的计算量,从而降低了算法的时间复杂度。仿真结果显示,该方案在很好的提高了同步算法的抗频偏性能。本文算法具有高效性、鲁棒性和可行性,能够满足LTE系统对同步性能的要求。

Fast Synchronization Algorithm in PSS Frequency Domain for TD-LTE System

As the important part in TD-LTE system, the symbol timing synchronization was required to have strong the performance of anti-frequency-offset and efficiency. In this paper, based on the existed Primary Synchronous Signal (PSS) timing synchronization algorithm, we utilized the characteristics of PSS sequence to present an efficient PSS timing synchronization algorithm with lower time complexity and high anti-frequency-offset performance. Based on the fast convolution and overlap add methods, as well as the frequency offset processing, the proposed fast synchronization algorithm in frequency domain conducted the joint estimation of symbol timing synchronization and coarse frequency offset. Theoretical analysis shows that the algorithm of paper reduces the computation of PSS timing synchronization, which reduces the timing complexity. The simulation results show that the proposed scheme improves the performance of anti-frequency-offset of PSS timing synchronization to a large degree. The algorithm of paper has the high efficiency, robustness and feasibility, which can meet the requirement of the synchronous performance in LTE system.