Antenna calibration technique based on channel prediction in time-varying TDD-MIMO system |
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| Institution: | 1. Chengdu University of Information Technology, Chengdu 610225, PR China;2. University of Electronic Science and Technology of China, Chengdu 610054, PR China;3. Business School of Sichuan University, Chengdu 610065, PRChina;1. Bussiness School, Sichuan University, Chengdu, 610064, P.R. China;2. College of Management Science, Chengdu University of Technology, Chengdu, 610059, P.R. China;1. School Of Internet Of Things Engineering, Jiangnan University, Wuxi 214122, China;2. Key Laboratory of Advanced Process Control for Light Industry Ministry of Education, Jiangnan University, Wuxi 214122, China;1. School of Economics & Management, Yanshan University, Qinhuangdao 066004, PR China;2. Gannan Normal University, Ganzhou 341000, PR China;3. Research Center of Hubei Logistics development, Hubei University of Economics, Wuhan 430205, PR China;1. School of information engineering, Guangdong Mechanical & Electrical College, Guangzhou 510550, PR China;2. Department of Information Science and Technology, Guangdong University of Foreign Studies South China Business College, Guangzhou 510545, PR China |
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| Abstract: | The traditional antenna calibration for time division duplex multiple input multiple output (TDD-MIMO) systems assume that free-space channel keeps constant during calibration, which is unreasonable under the high-speed rail and other time-varying channel scenarios for time variability can cause calibration error. This paper analyzes the performance of traditional antenna calibration methods, and then proposes an antenna calibration method based on Wiener channel prediction for time-varying TDD-MIMO system. Through theoretical derivation, we get the capacity formula of the TDD-MIMO system using traditional antenna calibration and antenna calibration based on channel prediction. The theoretical analysis and simulation results both indicate that the performance degradation of antenna calibration can be caused by time-varying channel and the prediction algorithm proposed in the paper can well compensate for the performance loss and significantly improve the antenna calibration performance for time-varying TDD-MIMO system. |
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