A Semi-Blind Method to Estimate the I/Q Imbalanc of THz Orthogonal Modulator  

作　　者：Juan Liu Ge Liu Qiuyu Wu Ying Wang He Yue Changxing Lin Xianjin Deng 

机构地区：[1]Microsystem and Terahertz Research Center,China Academy of Engineering Physics(CAEP),Chengdu 610200,China [2]Institute of Electronic Engineering,China Academy of Engineering Physics(CAEP),Mianyang 621900,China

出　　处：《China Communications》2021年第5期202-209,共8页中国通信（英文版）

基　　金：National Key RD Program of China Grant(2018YFB1801504);the President Funding of China Academy of Engineering Physics with No.YZJJLX2018009.

摘　　要：In terahertz communication,the direct frequency conversion structure in which orthogonal mixer is the main frequency conversion unit,makes engineers get into trouble of in-phase(I)branch and quadrature(Q)branch imbalance,carrier wave leakage,etc.These damages result in system performance tremendous degrades.We proposed a semiblind method to estimate the I/Q imbalance of THz orthogonal modulator,based on predefined preamble and pilot symbols for quadrature amplitude modulation(QAM).In this paper,a transmitter with Y band quadrature mixer and 20Gbps base-band signal has been tested.The bandwidth of the baseband signal was 7GHz,and the modulation type was 16QAM.By this method,7dB improvement of the system’s symbol Mean Square Error(MSE)has been got.That means the proposed method can be used to eliminate the I/Q imbalance effectively.

关 键 词：terahertz communication quadrature modulator I/Q imbalance correction digital signal processing 

分 类 号：TN761[电子电信—电路与系统]