An Angular Soft Forwarding Scheme for Wireless Cooperative Relay Networks

Abstract

In this paper, we propose a new methodology for soft forwarding which is based on a novel technique known as soft angular modulation (SAM). This is effective even under poor source-relay link conditions. The new treatment presented here allows a more flexible system design. This makes soft forwarding, which is not practical with current infrastructure, a feasible approach. In this work, we convert soft information from the soft domain into the angular domain. We then forward unity amplitude symbols using wireless fading channels. Due to the analogue nature of the probabilistic content (or soft information), the soft information relaying (SIR) scheme is not treated as a practically feasible relay protocol. We offer a remedy to this by forwarding unity amplitude symbols from the relay. Using the expression of soft noise variance, we deduct an approximate log likelihood ratio (LLR) expression for a parallel relay network employing SAM scheme. It is shown that the derived BER of SAM and numerical BER are closely aligned. The proposed scheme yields improved BER performance as compared to other conventional schemes.

Original language	English
Title of host publication	2018 IEEE 87th Vehicular Technology Conference, VTC Spring 2018 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1-6
Number of pages	6
Volume	2018-June
ISBN (Electronic)	9781538663554
DOIs	https://doi.org/10.1109/VTCSpring.2018.8417566
Publication status	Published - 20 Jul 2018
Event	87th IEEE Vehicular Technology Conference, VTC Spring 2018 - Porto, Portugal Duration: 3 Jun 2018 → 6 Jun 2018

Conference

Conference	87th IEEE Vehicular Technology Conference, VTC Spring 2018
Country	Portugal
City	Porto
Period	3.6.18 → 6.6.18

Keywords

and soft symbols
relay channel
soft angular modulation

ASJC Scopus subject areas

Computer Science Applications
Electrical and Electronic Engineering
Applied Mathematics

Access to Document

10.1109/VTCSpring.2018.8417566

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An Angular Soft Forwarding Scheme for Wireless Cooperative Relay Networks. / Jayakody, Dushantha Nalin K.; Qaraqe, Marwa; Dinis, Rui.

2018 IEEE 87th Vehicular Technology Conference, VTC Spring 2018 - Proceedings. Vol. 2018-June Institute of Electrical and Electronics Engineers Inc., 2018. p. 1-6.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Jayakody, DNK, Qaraqe, M & Dinis, R 2018, An Angular Soft Forwarding Scheme for Wireless Cooperative Relay Networks. in 2018 IEEE 87th Vehicular Technology Conference, VTC Spring 2018 - Proceedings. vol. 2018-June, Institute of Electrical and Electronics Engineers Inc., pp. 1-6, 87th IEEE Vehicular Technology Conference, VTC Spring 2018, Porto, Portugal, 3.6.18. https://doi.org/10.1109/VTCSpring.2018.8417566

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