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频偏估计是通信接收系统中的关键组成部分,它关系到OFDM接收系统的整体性能.从两个经典理论算法出发,提出一套基于FPGA的OFDM通信系统小数频偏估计的实现方案.主要描述了小数频偏估计相关算法的基本理论;如何对OFDM序列添加频偏值以及对频偏后的数据进行小数频偏估计并对数据进行补偿输出.该方案各部分模块程序皆由Verilog-HDL语言进行描述,同时在Xilinx公司EDK软件ISE环境下进行综合,然后应用Modelsim SE 6.5b软件进行仿真.实验结果表明,系统各部分模块工作良好,能够对频偏值做出准确的估计,并满足设计要求.
Frequency offset estimation is a key part of the communication receiving system and it relates to the overall performance of the OFDM receiving system.From the two classical theory algorithms, a set of FPGA-based implementation of fractional frequency offset estimation of OFDM communication system is proposed. How to add the frequency offset value to the OFDM sequence and estimate the fractional frequency offset of the data after the frequency offset and compensate the output of the data.The module programs of each part of the scheme are all implemented by the Verilog-HDL language And simulate with Xilinx EDK software ISE environment, and then use Modelsim SE 6.5b software to simulate.Experimental results show that each part of the system works well, can make accurate estimation of frequency offset value, and meet the design Claim.