一种快速的OFDM定时同步算法研究及其实现  

A Fast OFDM Time Synchronization Algorithm and its Implementation

作　　者：李加升[1] 常洪明[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2009年第2期101-104,共4页Journal of Guilin University of Electronic Technology

摘　　要：同步对于OFDM系统来说是很重要的一个环节。一种基于IEEE 802.11a标准的数据帧结构的双延时自相关算法,通过M ATLAB仿真,在高信噪比环境下可以快速而准确地完成定时同步,而无需进行符号定时同步能准确找到OFDM系统的解调窗,同时给出定时同步算法的具体FPGA设计方案。通过采用状态机、复用等设计方法,设计的系统在资源和速度上都得到优化,可便于工程应用。Synchronization is a very important aspect for OFDM systems. This paper discusses the principle of double auto-correlation algorithms based on the data frame structure of IEEE802.11a standard. The result of MAT- LAB simulation shows that the algorithm can achieve synchronization fast and accurate in high signal-to-noise environment, without the need for accurate symbol timing synchronization in OFDM systems to find demodulation window. At the same time, a scheme of the hardware implementation based on FPGA for timing synchronization algorithm was given. It optimizes the system in resources and the speed of operation by using state machine and multiplexing technology. The design is convenient for engineering application.

关 键 词：OFDM 定时同步 自相关 FPGA 

分 类 号：TN919.64[电子电信—通信与信息系统]