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학술지 An Efficient Calibration of MIMO Channel Sounders With Internal Crosstalk
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김준석, 이은애, 김청섭, 정영준, 조준호
IEEE Transactions on Vehicular Technology, v.69 no.9, pp.9445-9458
20HH1700, 선제적 주파수 이용을 위한 시·공간적 스펙트럼 엔지니어링 기술 개발, 정영준
In this paper, a calibration of multiple-input multiple-output (MIMO) channel sounders with internal crosstalk is considered.The objective is to minimize the number of back-to-back (B2B) connections required to estimate the transmitter (Tx) and receiver (Rx) response matrices that convey the information about linear distortion and internal crosstalk. A signal and system model is developed for the B2B measurements, where only some pairs of the Tx and Rx ports of the sounder are utilized among all pairs of the ports. Using the measurement model, a least-square estimation problem is then formulated and converted in the frequency domain to weighted rank-one approximation problems. The notion of system identifiability of a MIMO channel sounder is introduced and some optimal sets of B2B connections are proposed. Given a proposed optimal set of B2B connections, the alternate convex search (ACS) algorithm with a proper initialization is also proposed to solve the weighted rank-one approximation problems. Finally, it is shown how to calibrate field measurement data by using the estimated response matrices. Numerical results show that, only after a couple of iterations, the ACS algorithm with the proposed initialization achieves a comparable identification and calibration performance to the conventional method that requires the B2B connections of all port pairs.
KSP 제안 키워드
Channel Sounder, Conventional methods, Field measurement data, Least Square Estimation(LSE), Least Squares(LS), Linear distortion, Numerical results, back-to-back, frequency domain(FD), measurement model, multiple-input multiple-output (MIMO) channel