同相正交不平衡影响下的TDD MIMO-OFDM信道互易性补偿  

Compensation of channel non-reciprocity for TDD MIMO-OFDM system with IQ imbalance

作　　者：梁彦[1] 宋荣方[1] 李飞[1] 季薇[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《南京理工大学学报》2017年第6期765-768,791,共5页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(61501254;61471200;61603197);中国博士后科学基金(2014M561692);江苏省博士后科研资助计划(1402087C);南京邮电大学引进人才科研启动基金(NY213063)

摘　　要：为了弥补同相与正交(IQ)支路不平衡造成的时分双工(TDD)系统信道互易性损失,研究了接收机IQ不平衡影响下的TDD多输入多输出正交频分复用(MIMO-OFDM)系统的信道互易性补偿问题。通过建立时域信道互易性补偿模型,提出了基于补偿矩阵的信道互易性补偿方法。通过设计导频符号并采用高斯消元法,提出了基于导频辅助的补偿矩阵估计方法。仿真结果表明,该方法能够有效地补偿TDD MIMO-OFDM系统的信道互易性,所获得的系统性能与具有理想IQ支路的系统相近。The compensation of channel non-reciprocity for time-division duplex （ TDD ） multiple input multiple output orthogonal frequency-division multiplexing （ MIM0-0FDM ） system with receiver in-phase and quadrature- phase（IQ） imbalance is investigated to mitigate the loss of non- re-ciprocity channel. A channel compensation scheme based on a compensation matrix is proposed by building a time-domain channel non-recijDrocity compensation model . An estimation scheme of the compensation matrix aided by pilots is proposed by designing the pilot symbols and utilizing Gaussian elimination method . Simulation results show that , this scheme can compensate the channel non -reciprocity of the TDDMIMO-OFDM system effectively,and the system performance is similar to the system witli ideal IQ branches .

关 键 词：同相与正交支路不平衡 时分双工 多输入多输出 正交频分复用 信道互易性补偿 高斯消元法 补偿矩阵 

分 类 号：TN929.5[电子电信—通信与信息系统]