Efficient Implementation of Synchronization in OFDM System Based on FPGA
Efficient Implementation of Synchronization in OFDM System Based on FPGA
复制标题
基于FPGA的OFDM系统同步的高效实现
DOI：
10.1109/icact.2007.358333
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Huang Wei
中科院分区：
文献类型：
--
作者：
Wang Qiang;Tao Cheng;Huang Wei
提出了一种基于FPGA的OFDM系统的符号定时同步、小数频率估计和整数频率估计的组合同步方法。基于共轭乘法、Cordic算法和伪随机码的自相关特性，提出了一种OFDM符号定时同步和小数频偏估计器。同步电路的所有子模块均采用Verilog HDL描述或由Altera提供的MegaCore构建。计算机仿真结果表明，采用该算法的OFDM系统接收端可以在保护间隔内找到正确的符号定时点，同时可以捕获小数频偏并通过前馈方法进行补偿，最后可以通过整数频偏估计模块对数据流中存在的整数频偏进行补偿。
This paper presents a combinational synchronization method including symbol timing synchronization, fractional frequency estimate and integer frequency estimate applied to an OFDM system based on FPGA. An estimator for OFDM symbol timing synchronization and fractional frequency offsets is proposed based on conjugate multiplication, Cordic algorithm and autocorrelation properties of PN (pseudo noise) codes. All the sub-modules of synchronization circuit are described in Verilog HDL or constructed by MegaCore supplied by Altera. The results of computer simulation show that the receiver of the OFDM system applying the algorithm can find the right symbol timing point in the guard interval, meanwhile the fractional frequency offset can be caught and then compensated by a feedforward method, at last, the integer frequency offset that exists in the data stream can also be compensated by integer frequency estimation module.