MB-OFDM UWB接收机IQ不平衡和载波频偏的联合估计与补偿  

Joint Estimation and Compensation of IQ Imbalance and Carrier Frequency Offset in MB-OFDM UWB Receiver

作　　者：任世杰[1,2] 安建平[1] 徐湛[3] 卜祥元[1] REN Shi-jie;AN Jian-ping;XU Zhan;BU Xiang-yuan(School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;Shandong Provincial Key Laboratory of Optical Communication Science and Technology,Liaocheng University,Liaocheng,Shandong 252000,Chinal;School of Information and Communication Engineering,Beijing Information Science and Technology University,Beijing 100192,China)

机构地区：[1]北京理工大学信息与电子学院,北京100081 [2]聊城大学山东省光通信科学与技术重点实验室,山东聊城252000 [3]北京信息科技大学信息与通信工程学院,北京100192

出　　处：《北京理工大学学报》2018年第7期739-743,765,共6页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(61402044;61501214);国家自然科学基金国际合作项目(61620106001);北京市科技新星计划资助项目(Z161100004916086);北京市优秀人才资助计划青年拔尖项目(2016000026833ZK08);北京市属高校高水平教师队伍建设支持计划"青年拔尖人才培养计划"(CIT&TCD201704065);北京信息科技大学科技创新服务能力建设项目资助(71F1810921)

摘　　要：研究多频带正交频分复用超宽带(MB-OFDM UWB)接收机的IQ不平衡和载波频偏对系统性能的影响,提出一种时频域结合的IQ不平衡和载波频偏参数估计和补偿方法.接收机利用同一频带上的3个重复前导符号在时域作载波频偏估计和IQ不平衡估计,对数据单元预补偿;接收机利用数据单元的导频在频域进行残余IQ不平衡的逐段估计和补偿.仿真结果表明,这种时频域结合的参数估计和补偿方法能够克服IQ不平衡和载波频偏所带来的影响,当归一化CFO设定为40PPM时,可以实现幅度不平衡因子g=1.1和相位不平衡因子θ=10°以内的有效补偿.所设计方法具有较高的精度,并且适用于长符号MB-OFDM UWB系统.Studying the influence of IQ imbalance and carrier frequency offset（CFO）on the system performance in multi-band orthogonal frequency division multiplexing ultra wideband（MB-OFDM UWB）receiver,ajoint estimation and compensation method of IQ imbalance and CFO was proposed in time domain and frequency domain.First,three repeat preambles were used to estimate and compensate the CFO and IQ imbalance in time domain.Second,pilots of data unit were used to estimate and compensate the residual IQ imbalance in frequency domain.The simulation results show that the method can overcome the influence of IQ imbalance and CFO,when CFO is 40 PPM,IQ imbalance factor is g=1.1 andθ=10°,the IQ imbalance and CFO can be compensated.The design method is of high accuracy,and is suitable for long symbol MB-OFDM UWB system.

关 键 词：MB-OFDM UWB IQ不平衡 载波频偏 导频 

分 类 号：TN911.22[电子电信—通信与信息系统]