基于IEEE 802.15.3c的OFDM-UWB系统定时同步算法的研究

Timing Synchronization Algorithm Based on IEEE 802.15.3c for OFDM-UWB Systems

针对IEEE 802.15.3c标准规定的60GHz OFDM-UWB系统,分析前导格雷互补序列的特点,研究可抗多径干扰的定时同步方案.采用归一化自相关法,找下降沿进行帧检测和粗定时,利用格雷互补序列的自相关特性,找出多个峰值求平均来进行细定时.仿真表明,该方案能把残余的定时偏差控制在较小的范围内,同时算法复杂度低,定时精度高,而且在低信噪比的CM1多径信道下,细定时的MSRE能达到10-3数量级,能很好的抗多径干扰.

A complete scheme of timing synchronization is presented for the 60 GHz Multi-Band OFDM（MB-OFDM）Ultra Wide Band（UWB）system adopted by IEEE 802.15.3cproposal.This scheme is proved to be capable to eliminate the multipath interference by analyzing the features of Golay complementary sequences.Frame detection and coarse timing are implemented with the normalized autocorrelation method through finding the falling edge.Fine timing is achieved with the autocorrelation of Golay complementary sequences by identifying the multiple peaks and averaging.Simulations show that the residual timing error can be remain at a small scale,and the scheme has a low complexity and high timing accuracy.It is also shown that the MSRE magnitude of fine timing can reach 10-3 in the multipath channel CM1,which is proved a good Anti-multipath interference.