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A Range-Division User Relay Selection Scheme and Performance Analysis in NOMA-based Cooperative Opportunistic Multicast Systems

1
Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts and Telecommunication(BUPT), Beijing 100876, China
2
State Key Laboratory of Aerospace Dynamics, Xi’an 710043, Shaanxi, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(5), 544; https://doi.org/10.3390/electronics8050544
Received: 19 April 2019 / Revised: 8 May 2019 / Accepted: 9 May 2019 / Published: 15 May 2019
(This article belongs to the Special Issue Cooperative Communications for Future Wireless Systems)
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Abstract

The original user relay (UR) selection scheme of non-orthogonal multiple access-based cooperative opportunistic multicast scheme, which realizes inter-group cooperation between two multicast groups, ignores the distribution trend of candidate UR in the cell and adopts fixed efficient relay selection range (ERSR) to select UR. It results in high UR selection ratio. Then the coverage efficiency, defined as the ratio of successfully received users to URs, is low. To tackle this problem, a range-division user relay (RDUR) selection scheme is proposed in this paper. Firstly, it divides the circular coverage range of base station into several continuous annular areas (AAs). Secondly, different ERSRs are assigned to unsuccessfully received users in different AAs. Under different ERSR assignments, the performances of UR selection ratio and coverage ratio are analyzed. Lastly, the radius set of ERSR that optimizes system coverage efficiency is used to perform UR selection. From simulation results, with different radius sets, analytical results of UR selection ratio and coverage ratio match well with their simulated ones. It is proved that ERSR allocation affects UR selection ratio and coverage ratio. With RDUR scheme, coverage efficiency increases by at least 14% and capacity efficiency has also been improved. View Full-Text
Keywords: coverage efficiency; cooperative multicast; NOMA; path loss; relay selection scheme coverage efficiency; cooperative multicast; NOMA; path loss; relay selection scheme
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Zhang, Y.; Wang, X.; Wang, D.; Zhao, Q.; Zhang, Y. A Range-Division User Relay Selection Scheme and Performance Analysis in NOMA-based Cooperative Opportunistic Multicast Systems. Electronics 2019, 8, 544.

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