基于IEEE802.15.3c的OFDM超宽带系统时频同步算法

Time and Frequency Synchronization Algorithms for OFDM-UWB System Based on IEEE802.15.3c Standard

针对IEEE802.15.3c标准规定的60GHz OFDM超宽带系统,通过算法改进与仿真,给出基于前导序列及导频的完整时频同步算法方案.提出基于格雷互补序列的抗多径分离滑动相关检测方法(SSCD),并对多个相关峰位置取平均以增加定时抗噪能力.提出相位均衡结合整数倍样值偏差预修正的采样频率同步方法(PE-ISDPC),利用循环前缀的容忍性吸收整数倍样值偏差以降低实现复杂度.仿真结果表明,系统具有良好的时频同步性能,且整体方案具有较低的复杂度.

In this paper,an intact time and frequency synchronization scheme was presented based on the preamble and the pilots for the OFDM UWB system specified in the IEEE802.15.3c standard.An anti-multipath separated sliding correlation detection（SSCD）method was proposed based on the Gray complementary sequences,and the positions of the correlation peaks were averaged to increase the anti-noise capability of timing.A sampling frequency synchronization method was also presented for doing phase equalization combined with integer sampling deviation pre-correction（PE-ISDPC）,which could exploit the tolerance of the cyclic prefix to the integer sample deviation,reducing the implementation complexity.Simulation results show that the system has a better performance of time and frequency synchronization,and the complexity of overall scheme is low.