OFDM系统中同步偏差的联合估计算法

Joint Estimation Algorithm of Synchronization Offset in OFDM System

研究基于IEEE 802.11a的正交频分复用(OFDM)系统,分析同步偏差对该系统的影响,提出一种联合估计算法。利用导频序列估计频域中OFDM系统的同步偏差,包括符号定时偏差、载波频率偏差和采样时钟频率偏差。仿真结果证明,该算法的误包率较低,能较好地应用于OFDM系统。

This paper investigates the synchronization offset effects in Orthogonal Frequency Division Multiplexing（OFDM） based on IEEE 802.11a system,and proposes a joint estimation algorithm.The joint estimation algorithm comprehensive estimates the synchronization offset only in the frequency domain.When the OFDM system has Symbol Timing Offset（STO）,Carrier Frequency Offset（CFO） and Sampling clock Frequency Offset（SFO）,the algorithm can obtain the accurate offset information.Simulation results show that the proposed joint estimation algorithm has good performance of Packet Error Rate（PER）,and it is well competent in OFDM system.