突发OFDM系统中同步算法的FPGA实现

FPGA Implementation of Synchronization Algorithm in Burst OFDM System

根据突发OFDM系统的特点,提出了一种具有实用价值的同步实现方法。具体分析了突发OFDM系统中利用PN序列联合实现符号定时同步和小数频偏同步的算法,并阐述基于FPGA的实现过程。由Verilog HDL语言描述的同步模块由复数乘法模块,求和累加模块,比较判断模块和CORDIC模块等构成。系统采用Xilinx ISE 10.1来完成开发,同时给出了其在ModelSim SE 6.2b下的仿真结果,结果表明该方案是完全可行的。

According to the characteristics of burst OFDM system,this paper presents an implementation method for synchronization in the OFDM system.The joint algorithm of symbol timing synchronization and fractional frequency offset estimation based on PN sequences is analyzed in detail,and the process of FPGA implementation is illustrated.The synchronization module described in Verilog HDL includes four components：complex multiplication module,addition module,comparison module and CORDIC module.Xilinx ISE 10.1 is used in the system development.Finally,the simulation results under ModelSim SE 6.2b indicate that the proposed scheme is applicable to the burst OFDM system.