基于fpga的频偏估计算法实现.pdfVIP

第41卷　 第5期 　 计 算 机 工 程 2015年5月 　 　 Vol.41　 No.5 　 Computer Engineering May2015 ·移动互联与通信技术 · 文章编号:1000-3428(2015)05-0111-07　 　 　 文献标识码:A　 　 　 中图分类号:TP393 基于FPGA 的频偏估计算法实现 曹亚桃,冷　 文,王安国,刘立红 (天津大学电子信息工程学院,天津300072) 摘　 要:在OQPSK调制的数字无线通信系统中,利用时域自相关算法进行频偏估计时需要进行大量自相关运算, 导致运算复杂度较高。 针对该问题,对基于相邻接收信号自相关函数相位差的频偏估计算法进行优化,提出一种 适合现场可编程门阵列(FPGA)实现的硬件方案。 通过对三口RAM读地址的控制进行数据连接实现串行运算, 节省了大量硬件资源。 使用加减运算对滑动自相关运算进行改进,降低了运算复杂度。 对整个系统进行时序仿真 验证,结果表明,FPGA实现的频偏估计结果接近于真实值,证明了方案的可行性及算法的正确性。 关键词:频偏估计;OQPSK调制;现场可编程门阵列实现;复杂度;自相关;硬件资源 中文引用格式:曹亚桃,冷　 文,王安国,等.基于FPGA的频偏估计算法实现[J].计算机工程,2015,41(5):111-117,124. 英文引用格式:Cao Yatao,Leng Wen,Wang Anguo,et al.Implementation of Frequency Offset Estimation Algorithm Based on FPGA[J].Computer Engineering,2015,41(5):111-117,124. Implementation of Frequency Offset Estimation Algorithm Based on FPGA CAO Yatao,LENG Wen,WANG Anguo,LIU Lihong (School of Electronic Information Engineering,Tianjin University,Tianjin300072,China) 【Abstract】 In the digital wireless communication system of OQPSK modulation,a large amount of autocorrelation is required for frequency offset estimation based on time domain autocorrelation,which leads to high computational complexity.To overcome this drawback,an optimization algorithm being suitable for Field Programmable Gate Array (FPGA) implementation of the frequency offset estimation is proposed,which is based on the phase difference of the adjacent received signals autocorrelation.In this paper,the serial computation is realized by controlling the three-port RAM’sread address to achieve data connection,which saves a number of hardware resources.In terms of algorithms, addition and subtraction are ut