基于巴克码自相关特性的无线局域网同步算法

Synchronization Algorithm Based on the Auto-correlation of Barker Code for Wireless LAN

在基于IEEE 802.11b标准的无线局域网中,提出一种简单的同步算法.该算法根据帧头数据的巴克码自相关特性,通过能量累加和峰值位置比较找到帧头,实现粗同步;然后对帧头数据解调并找到SFD字段,从而实现系统的精确同步.仿真结果表明,算法在信噪比较差的情况下也能精确实现系统同步,且便于硬件实现.

A simple synchronization algorithm is proposed in IEEE 802.1 lb WLAN system. According to the auto correlative character of the frame header, the algorithm can get coarse synchronization through power summing and peak position comparing; then realize accurate synchronization by finding the SFD field from the demodulated data of the frame header. Simulation results show that the algorithm can get accurate synchronization even if the channel is very bad. It is a simple and useful algorithm and can be easily realized through hardware.