TY  - JOUR
Y1  - 2019/06//
N2  - 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.
JF  - IEEE Transactions on Wireless Communications
N1  - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions.
ID  - discovery10077918
VL  - 18
UR  - https://doi.org/10.1109/TWC.2019.2911497
PB  - IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
TI  - Efficient Downlink Channel Reconstruction for FDD Multi-Antenna Systems
AV  - public
A1  - Han, Y
A1  - Hsu, T-H
A1  - Wen, C-K
A1  - Wong, K-K
A1  - Jin, S
SP  - 3161
SN  - 1558-2248
EP  - 3176
IS  - 6
KW  - MIMO antenna system
KW  -  frequency division duplex
KW  -  downlink channel reconstruction
KW  -  over-the-air test.
ER  -