一种基于卷积的OFDM定时同步算法实现

Implementation of timing synchronization based on convolution for OFDM system

针对最高传输速率为Gb/s量级的OFDM试验系统,提出一种改进的定时同步方案。基于卷积计算和自相关计算,具有较高的同步准确性及较快的帧检测速度。改进同步算法在Xilinx公司的Virtex-5 FPGA芯片中实现,其消耗的资源都能控制在总资源的20%以内。最终,该实现方案在一个实时系统中得到应用,并在这个平台上进行了性能验证。在室内无线信道环境及接收信号幅值异常情况下,该算法的实现方案都能准确、稳定地工作。

This paper proposes an improved timing synchronization method for a Gb/s OFDM trial system. It is based on the convolution and correlation calculation and has fast detection rate and high synchronization performance. The proposed algorithm is implemented on a virtex-5 FPGA of Xilinx and the hardware resource consumption is lower than 20% of the total resource. Final- ly, the implementation scheme is applied to a real-ime system and verified in this platform. In the indoor wireless environment and situation of abnormal amplitude of the received signal, the scheme can work as normal.