针对正交频分复用定时同步实际应用问题,利用循环前缀的统计能量差和统计相关特性.提出了一种改进的TD—LTE下行定时同步算法,减小了计算复杂度,同时能检测循环前缀类型。仿真结果表明,算法在多径衰落信道下,特别是小信噪比条件下,定时同步性能优越,并对归一化频偏和多普勒频移变化具有较强的适应能力。
Aimed at the application problem of timing synchronization algorithm in orthogonal frequency division multiplexing system, an improved algorithm for TD-LTE downlink time synchronization was proposed. It utilizes statistical energy difference and correlation of cyclic prefix to improve the system performance, which reduces the computational complexity, and can detect the cyclic prefix types. The simulation results demonstrate that the performance of the new method is excellent in multi-path fading channels, especially in the case of small SNR. And it is robust against the normalized frequency offset and Doppler shift.