eprintid: 1546230
rev_number: 29
eprint_status: archive
userid: 608
dir: disk0/01/54/62/30
datestamp: 2017-03-29 09:35:50
lastmod: 2021-12-13 03:13:21
status_changed: 2017-03-29 09:35:50
type: article
metadata_visibility: show
creators_name: Li, A
creators_name: Masouros, C
title: Exploiting Constructive Mutual Coupling in P2P MIMO by Analog-Digital Phase Alignment
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F46
keywords: Science & Technology, Technology, Engineering, Electrical & Electronic, Telecommunications, Engineering, MIMO, mutual coupling, constructive interference, optimization, Green Signal Power, Spatial Correlation, Precoding Scheme, Wireless Systems, Fading Channels, Performance, Interference, Compensation, Downlink, Antennas
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abstract: In this paper, we propose a joint analog-digital (A/D) beamforming scheme for the point-to-point multiple-input-multiple-output system, where we exploit mutual coupling by optimizing the load impedances of the transmit antennas. Contrary to the common conception that mutual coupling strictly harms the system performance, we show that mutual coupling can be beneficial by exploiting the concept of constructive interference. By changing the value of each load impedance for the antenna array based on convex optimization, the mutual coupling effect can be manipulated so that the resulting interference aligns constructively to the useful signal vector. We first prove that the full elimination of mutual coupling effect is not achievable solely by tuning the values of the antenna load impedances. We then introduce the proposed A/D scheme for both PSK and QAM modulations, where performance gains with respect to conventional techniques are obtained. The implementation of the proposed schemes is also discussed, where a lookup table can be built to efficiently apply the calculated load impedances. The numerical results show that the proposed schemes can achieve an improved performance compared to systems with fixed mutual coupling, especially when the antenna spacing is small.
date: 2017-01-24
date_type: published
publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
official_url: http://doi.org/10.1109/TWC.2017.2657631
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
article_type_text: Article
verified: verified_manual
elements_id: 1276958
doi: 10.1109/TWC.2017.2657631
lyricists_name: Li, Ang
lyricists_name: Masouros, Christos
lyricists_id: ALIAX43
lyricists_id: CMASO14
actors_name: Masouros, Christos
actors_id: CMASO14
actors_role: owner
full_text_status: public
publication: IEEE Transactions on Wireless Communications
volume: 16
number: 3
pagerange: 1948-1962
pages: 15
issn: 1558-2248
citation:        Li, A;    Masouros, C;      (2017)    Exploiting Constructive Mutual Coupling in P2P MIMO by Analog-Digital Phase Alignment.                   IEEE Transactions on Wireless Communications , 16  (3)   pp. 1948-1962.    10.1109/TWC.2017.2657631 <https://doi.org/10.1109/TWC.2017.2657631>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1546230/1/Masouros_Exploiting%20Mutual%20Coupling%20for%20P2P%20MIMO_vor.pdf