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Efficient Downlink Channel Reconstruction for FDD Multi-Antenna Systems

Han, Y; Hsu, T-H; Wen, C-K; Wong, K-K; Jin, S; (2019) Efficient Downlink Channel Reconstruction for FDD Multi-Antenna Systems. IEEE Transactions on Wireless Communications , 18 (6) pp. 3161-3176. 10.1109/TWC.2019.2911497. Green open access

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Abstract

In this paper, we propose a novel scheme to reconstruct the downlink channel of a frequency-division-duplex (FDD) multi-antenna system utilizing uplink channel state information (CSI) combined with limited feedback. Our finding is that spatial reciprocity holds among frequency-independent parameters, including the gain, delay and angle of each propagation path in a wireless channel. Based on this, we first introduce the Newtonized orthogonal matching pursuit (NOMP) algorithm to estimate these frequency-independent parameters during uplink sounding. The gains are then refined through downlink training and sent back to the base station (BS). With only a limited amount of overhead, the refinement is able to improve the accuracy of downlink channel reconstruction substantially. Utilizing the uplink-estimated delays and angles and the downlink-refined gains, the BS can reconstruct the downlink channel from the uplink estimation. We carry out both simulations and over-the-air tests to assess the performance of the proposed downlink channel reconstruction scheme. Results demonstrate that the proposed scheme is promising.

Type: Article
Title: Efficient Downlink Channel Reconstruction for FDD Multi-Antenna Systems
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TWC.2019.2911497
Publisher version: https://doi.org/10.1109/TWC.2019.2911497
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: MIMO antenna system, frequency division duplex, downlink channel reconstruction, over-the-air test.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10077918
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