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.
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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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