Optimum power allocation for LDPC coded soft forwarding scheme in wireless networks

Abstract

This paper proposes a new power efficient multilevel threshold based soft quantization (MLT- SQ+PA) scheme for a multiple access relay system (MARS). In the proposed MLTSQ+ PA protocol, the relay computes the reliabilities, expressed as log-likelihood ratios (LLRs), of the received signals from the two sources. We provide an analytical closed form expression for the optimized power allocation factor at the relay. The relay evaluates the LLRs of the network-coded packet, quantizes and scales these using the optimum power allocation factor, forwarding the resulting »quantized soft symbols» to the destination. Compared to competing schemes, the performance of our system is superior in terms of BER when the same amount of channel state information (CSI) is exploited.

Original language	English
Title of host publication	2015 IEEE 81st Vehicular Technology Conference, VTC Spring 2015 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
Volume	2015
ISBN (Electronic)	9781479980888
DOIs	https://doi.org/10.1109/VTCSpring.2015.7145988
Publication status	Published - 1 Jul 2015
Externally published	Yes
Event	81st IEEE Vehicular Technology Conference, VTC Spring 2015 - Glasgow, United Kingdom Duration: 11 May 2015 → 14 May 2015

Conference

Conference	81st IEEE Vehicular Technology Conference, VTC Spring 2015
Country	United Kingdom
City	Glasgow
Period	11.5.15 → 14.5.15

ASJC Scopus subject areas

Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1109/VTCSpring.2015.7145988

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Optimum power allocation for LDPC coded soft forwarding scheme in wireless networks. / Jayakody, Dushantha N.K.; Li, Jun.

2015 IEEE 81st Vehicular Technology Conference, VTC Spring 2015 - Proceedings. Vol. 2015 Institute of Electrical and Electronics Engineers Inc., 2015. 7145988.

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

Jayakody, DNK & Li, J 2015, Optimum power allocation for LDPC coded soft forwarding scheme in wireless networks. in 2015 IEEE 81st Vehicular Technology Conference, VTC Spring 2015 - Proceedings. vol. 2015, 7145988, Institute of Electrical and Electronics Engineers Inc., 81st IEEE Vehicular Technology Conference, VTC Spring 2015, Glasgow, United Kingdom, 11.5.15. https://doi.org/10.1109/VTCSpring.2015.7145988

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AB - This paper proposes a new power efficient multilevel threshold based soft quantization (MLT- SQ+PA) scheme for a multiple access relay system (MARS). In the proposed MLTSQ+ PA protocol, the relay computes the reliabilities, expressed as log-likelihood ratios (LLRs), of the received signals from the two sources. We provide an analytical closed form expression for the optimized power allocation factor at the relay. The relay evaluates the LLRs of the network-coded packet, quantizes and scales these using the optimum power allocation factor, forwarding the resulting »quantized soft symbols» to the destination. Compared to competing schemes, the performance of our system is superior in terms of BER when the same amount of channel state information (CSI) is exploited.

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