基于AF-OFDM协作通信系统中的时间同步

Timing Synchronization for AF-OFDM Cooperative Communication System

针对AF-OFDM协作通信系统的时间同步问题,提出了一种充分利用Zadoff-Chu(ZC)序列及信道多径衰落特性的新算法。该算法在信道长度已知的情况下,在一个OFDM符号内实现多个时间偏移估计。此外,无需花费额外开销,就能同时实现多个信道估计。仿真结果表明,与不同周期同步模式(UPSPs)方法相比,在任何信噪比情形下,本文算法准确性更高。

For the timing syl,chronization problem of OFDM - based cooperative communication sys- tem in amplify and forward protocol, a new algorithm is proposed by making full use of Zadoff - Chu （ZC） sequences and multipath fading channel. With the knowledge of channel length, both the multiple timing offsets and channel estimation can be estimated by our proposed algorithm within on- ly one OFDM block. Simulation results show that our proposed algorithm can achieve better system accuracy than unequal period synchronization patterns （UPSPs） approach under the condition of any signal - to - noise ratio.