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TDD reciprocity calibration for multi-user massive MIMO systems with iterative coordinate descent

Science China(Information Sciences) 2016年第10期59卷 93-102页

作者： Hao WEI Dongming WANG Jiangzhou WANG Xiaohu YOU National Mobile Communications Research Laboratory Southeast University School of Engineering and Digital Arts University of Kent

For massive multiple-input multiple-output(MIMO) antenna systems, time division duplexing(TDD) is preferred since the downlink precoding matrix can be obtained through the uplink channel estimation,thanks to the channel reciprocity. However, the mismatches of the transceiver radio frequency(RF) circuits at both sides of the link make the whole communication channel non-symmetric. This paper extends the total least square(TLS) method to the case of self-calibration, where only the antennas of the access points(APs) are involved to exchange the calibration signals with each other and the feedback from the user equipments(UEs)is not required. Then, the proof of the equivalence between the TLS method and the least square(LS) method is presented. Furthermore, to avoid the eigenvalue decomposition required by these two methods to obtain the calibration coefficients, a novel algorithm named as iterative coordinate descent(ICD) method is *** analysis and simulation results show that the ICD method significantly reduces the complexity and achieves almost the same performance of the LS method.

关键词： TDD reciprocity calibration total least squares coordinate descent large-scale MIMO

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Cooperative TDD reciprocity calibration with diversity combining for distributed large-scale MIMO systems

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Journal of Communications and Information Networks 2017年第3期2卷 61-67页

作者： Hao Wei Dongming Wang Jingyu Hua Junhui Zhao National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China Zhongxing Telecommunication Equipment Corporation Shanghai 201203China Zhejiang University of Technology Hangzhou 310023China School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China

Thanks to channel reciprocity,the time-division duplexing operation is typically used for distributed large-scale multiple-input multiple-output *** the knowledge of uplink channel state,APs(Access Points)perform the downlink precoding to cooperatively communicate with multiple UEs(User Equipments).Unfortunately,the channel reciprocity is often jeopardized by the non-symmetric transceiver RF(Radio Frequency)circuits at both sides of the *** excluding UEs from the calibration procedure,the TLS(Total Least Squares)method is extended to the case of partial calibration,where only the APs are involved to exchange calibration signals to compensate for RF ***,channel fluctuations between APs significantly degrade system ***,we propose a scheme to obtain the diversity gain,by performing a calibration with the combination of the calibration signals of different channel coherent *** results confirm the effective performance and robustness of our scheme.

关键词： reciprocity calibration RF mismatch large-scale MIMO diversity combining time-division duplexing

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