Influence of Modulation Rate on Energy Efficiency for Relay-aided Transmission: Decode-and-forward Protocol

DOI

10.2991/ifeea-15.2016.25How to use a DOI?

Keywords

Energy Efficiency; Decode-and-forward; Relaying Systems; Modulation Rate

Abstract

In this paper, we investigate the effect of modulation rate on the energy efficiency of a two-hop communication system with the assistance of a half-duplex decode-and-forward (DF) relay, considering the given bit error rate (BER) and using the M-QAM modulation. First, we formulate the optimum model of transmission power, subject to the given BER. Then the minimum transmission power under the constraint of the given BER is obtained. For energy efficiency problem, the circuit power consumption of devices can not be ignored, so with the circuit power consumption considered, we derive and analyze the expression of energy efficiency based on the modulation rate. According to convex optimization theory, energy efficiency is a quasi-concave function of modulation rate has been proved. We find that when the modulation rate increases, the energy efficiency will be first increases and then decreases. Finally, the theoretical analysis is corroborated by simulation results. Moreover, it is shown that the location of relay node has effect on system energy efficiency.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Rui Sun
AU  - Tao Wang
AU  - Fangfang Chen
AU  - QingHua Huang
PY  - 2016/01
DA  - 2016/01
TI  - Influence of Modulation Rate on Energy Efficiency for Relay-aided Transmission: Decode-and-forward Protocol
BT  - Proceedings of the 2015 2nd International Forum on Electrical Engineering and Automation (IFEEA 2015)
PB  - Atlantis Press
SP  - 121
EP  - 127
SN  - 2352-5401
UR  - https://doi.org/10.2991/ifeea-15.2016.25
DO  - 10.2991/ifeea-15.2016.25
ID  - Sun2016/01
ER  -