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Low‐complexity and full‐diversity parallel interference cancellation for multiuser wireless relaying networks
Author(s) -
El Astal MohammedTaha,
Ismail Amr,
Alouini MohammedSlim,
Olivier Jan Corne
Publication year - 2019
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.3580
Subject(s) - relay , single antenna interference cancellation , channel state information , computer network , node (physics) , computer science , cooperative diversity , transmission (telecommunications) , interference (communication) , decoding methods , upper and lower bounds , wireless network , topology (electrical circuits) , wireless , channel (broadcasting) , telecommunications , fading , mathematics , physics , combinatorics , power (physics) , mathematical analysis , quantum mechanics
In this paper, the multiuser interference of wireless relaying networks (WRNs) is considered. Two transmission protocols with an interference cancellation scheme are proposed, namely, the c o n c u r r e n t S − R − D ‐ P I C R , D protocol for decode‐and‐forward WRNs and the c o n c u r r e n t S − R − D ‐ P I C D protocol for amplify‐and‐forward WRNs. Unlike the existing protocols, these protocols allow the concurrent transmission in both phases of the transmission, and hence, higher spectral efficiency is offered while maintaining low decoding complexity. The c o n c u r r e n t S − R − D ‐ P I C R , D protocol achieves interference‐free diversity without imposing any condition on the node's antenna number. However and similar to most existing protocols, this protocol requires the channel state information (CSI) of the users‐relay links at the relay. In contrast, the c o n c u r r e n t S − R − D ‐ P I C D protocol achieves a better diversity order, given that the relay's antenna >8, whereas CSI is required only at the destination. Although the diversity's upper bound is not achieved, this protocol uses a simple relay as no CSI or encoding is required at the relay. In addition and unlike the existing protocols, the achievable diversity is determined by both the user's and the destination's antennas, and it is not sacrificed while the number of users is increased. This paper also establishes sufficient conditions for a space‐time block code to achieve the mentioned diversity gain of the proposed protocols.