基于OFDM无线通信系统的线性回归频偏估计算法  

Linear regression frequency offset estimation algorithm based on OFDM wireless communication system

作　　者：陈坤[1,2] 吴虹[1,2] 刘勇[1,2] 王琦琦[1,2] 向坤[1,2] 

机构地区：[1]南开大学电子信息与光学工程学院,天津300071 [2]南开大学天津市信息光子材料与技术重点实验室,天津300071

出　　处：《光电子．激光》2014年第10期1919-1925,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(60872026);高等学校博士学科点专项科研基金(20110031110028);天津市应用基础与前沿技术研究计划(13JCZDJC26000;13JCQNJC01000)资助项目

摘　　要：为了适应60GHz新型WiFi对频偏同步的要求,提出了一种基于IEEE802.11ad-2012修正案系统的线性回归频偏估计(LROE)算法。算法将接收到的前导序列与本地序列进行互相关运算,然后提取互相关值的相位角进行线性回归计算,估计出频偏值。从理论推导了算法在高斯信道和多径信道下的抗噪声和抗多径性能。在多径信道仿真中,本算法的频偏估计精度优于传统自相关算法3个数量级,满足了系统对高精度频偏估计的要求。在全系统仿真中,对比研究了本算法和自相关算法对系统误比特率(BER)性能的影响,并与无频偏对照组仿真进行对比。LROE算法的BER明显优于自相关算法。仿真研究表明,LROE算法基本消除了频偏对系统BER的影响,其性能达到了无频偏系统的效果,达到了60GHz系统对频偏同步的要求。In order to adapt to the new 60 GHz WiFi on frequency synchronization requirements,this paper presents a linear regression offset estimation（LROE）algorithm based on IEEE802.11ad-2012-amendment system.The algorithm cross-correlates the received preamble sequences with the local sequences,and then extracts the phase angle of the cross-correlation value to estimate the frequency offset by using the linear regression calculation.In the Gaussian channel and multipath channel,the algorithm performance of anti-noise and anti-multipath is analyzed in theory.In the multipath channel simulation,its accuracy of the estimation is beyond the traditional auto-correlation algorithm by three orders of magnitude,and it satisfies the accurate requirements in the frequency estimation system.In the whole system simulation,compared with the traditional auto-correlation algorithm and the LROE algorithm,the performance of the BER is studied,and a no frequency offset control group simulation is set up for comparison.The bit error rate of the LROE algorithm is obviously better than the traditional auto-correlation algorithm.Simulation results show that the LROE algorithm eliminates the frequency offset of the bit error rate of the system,and its performance has achieved no frequency offset.The frequency offset synchronization requirement of the whole 60 GHz system is realized by the LROE algorithm.

关 键 词：线性回归 频偏估计 OFDM 60GHz无线通信 

分 类 号：TN92[电子电信—通信与信息系统]