NDLI: Channel reciprocity of compact antenna array and the calibration

Content Provider	IEEE Xplore Digital Library
Author	Jing Shi Qinglin Luo Huan Sun
Copyright Year	2011
Description	Author affiliation: Alcatel-Lucent Bell Labs (China), Research and Innovation Center, Alcatel-Lucent Shanghai Bell Co., Ltd., China (Jing Shi; Qinglin Luo; Huan Sun)
Abstract	Channel reciprocity is regarded as one of the most important advantages of TDD systems. However, the uplink (UL) and downlink (DL) channels are not actually reciprocal because of different characteristics of transmitters (TXs) and receivers (RXs). When the antenna elements are placed with large distance, the Radio Frequency (RF) gain mismatch of TXs and RXs is the dominant un-reciprocal factor, but if the antenna elements are placed close, such as compact antenna array, mutual coupling (MC) should be considered. In general, the MC effects for a transmitting and receiving array are different, even if the physical geometry of the array remains unchanged. Conventional reciprocity calibration methods mainly target at compensating RF gain mismatch and regard reciprocity error as diagonal matrix. However, the reciprocity error is no longer diagonal for compact antenna array due to the un-reciprocal MC of TXs and RXs, and thus the conventional calibration methods do not work in this scenario. In this paper, a comprehensive reciprocity error model is proposed firstly, and a combined MMSE and dot-division calibration scheme is then presented for calibrating MC and RF mismatch at the same time. Link level simulation results demonstrate the efficiency of the proposed scheme. The calibration method can well calibrate the UL and DL channel reciprocity, and the performance can be boosted up to around 1dB∼2dB less than the ideal reciprocal case.
Starting Page	1953
Ending Page	1957
File Size	489797
Page Count	5
File Format	PDF
ISBN	9781457713460
e-ISBN	9781457713484
e-ISBN	9781457713477
DOI	10.1109/PIMRC.2011.6139852
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-11
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Calibration Arrays Mutual coupling Antenna arrays Radio frequency Transmitting antennas Channel Re Mutual Coupling
Content Type	Text
Resource Type	Article

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