Calibration of Transmitter I/Q Imbalance Based on Digital Pre-distortion
CHEN Lei①② YUE Guangrong① TANG Junlin① LI Shaoqian① SONG Zhiqun② ZENG Yuan③
①(National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China) ②(Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory, The 54th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang 050081, China) ③(Shanghai Institute of Aerospace System Engineering, Shanghai 201108, China)
The in-phase (I) and quadrature (Q) imbalance, carrier leakage and in-band distortion may lead to severe performance degradation, especially in direct-conversion radio architecture. An adaptive pre-distortion scheme is proposed to calibrate I/Q imbalance, carrier leakage and in-band distortion. In the proposed scheme, the inverse filter of each branch is estimated directly which avoids redundant computation. Moreover, an iterative scheme is proposed to track the parameters variation due to temperature in an online manner. By complexity analysis, the proposed scheme is efficient. The effectiveness of the scheme is testified by simulation.
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