本文研究了基于IEEE802.11a协议的无线局域网络系统的频偏估计问题，介绍了IEEE802.11按系统中前导序列的特点和作用，阐述了传统频偏估计算法并改进，仿真结果表明改进的算法优于传统算法。-In this paper, based on the IEEE802.11a wireless LAN protocol system frequency offset estimation problem, introduce the IEEE802.11 system leader sequen