一种OFDM剩余载波频偏估计算法的FPGA实现

FPGA Implementation of an OFDM Residual Carrier Frequency Offset Estimation Algorithm

分析了正交频分复用(OFDM)系统中剩余载波频偏在FFT之后对解调数据的影响,利用OFDM符号中插入的离散导频符号,对剩余频偏进行估计。在对算法进行仿真分析的基础上,提出了算法的现场可编程门阵列(FPGA)实现方案。整个设计过程在QuartusⅡ平台下进行,包括VHDL语言编程、逻辑综合和时序仿真,结果和理论分析相一致,可以用来对剩余频率偏差进行有效的纠正。

After FFT, the impact of residual carrier frequency offset to the demodulated data is analyzed in the Orthogonal frequency division multiplexing（OFDM）system. Using the scattered pilots inserted in OFDM symbols, the residual frequency offset is estimated. On the basis of simulation and analysis to the algorithm ,the implementation scheme using Field Programmable Gate Array （FPGA） is presented. The whole design process runs on the platform of Quartus Ⅱ, which includes VHDL programming, logic synthesis and timing simulation. The result is consistent with the one analyzed in theory and can be used to correct the residual frequency offset effectively.