WiFi接收机的相位跟踪研究  

Research on Phase Tracking of WiFi Receiver

作　　者：王维 白栎旸 胡晓毅[3] WANG Wei;BAI Limin;HU Xiaoyi(The eighth Research Institute of China Shipbuilding Corporation,Nanjing 211100,China;Nanjing Ruihe Electronics Co.,Ltd.,Nanjing 210018,China;School of injormation science and technology,Xiamen University,Xiamen 361005,China)

机构地区：[1]中国船舶集团有限公司第八研究院,江苏南京211100 [2]南京睿赫电子有限公司,江苏南京210018 [3]厦门大学信息科学与技术学院,福建厦门361005

出　　处：《电视技术》2022年第3期146-148,共3页Video Engineering

摘　　要：本文对多天线WiFi OFDM通信过程中存在的相位问题,即采样频偏和载波频偏的跟踪补偿算法进行了研究。在充分分析采样频偏和载波频偏原理的基础上,建立WiFi场景的信道模型,并在此模型下对比最小二乘估计以及卡曼滤波器平滑后的相位跟踪补偿效果。研究表明,对比最小二乘估计,使用卡曼滤波后在信噪比高于30 dB的信道上会发生误差矢量幅度(Error Vector Magnitude,EVM)损失,证明了卡曼滤波在WiFi信道建模下的增益并不明显。This paper studies the phase problem in multi antenna WiFi OFDM communication,that is,the tracking compensation algorithm of sampling frequency offset and carrier frequency offset.Based on the full analysis of the principles of sampling frequency offset and carrier frequency offset,this paper establishes the channel model of WiFi scene,and compares the phase tracking compensation effects of least square estimation and Kalman filter smoothing under this model.The research shows that compared with the least square estimation,Error Vector Magnitude(EVM)loss will occur on the channel with signal-to-noise ratio higher than 30 dB after using Kalman filter,which proves that the gain of Kalman filter under WiFi channel modeling is not obvious.

关 键 词：采样频偏 载波频偏 相位跟踪 

分 类 号：TN929.5[电子电信—通信与信息系统]