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Downlink Energy Efficiency Power Allocation for OFDM-based Aerial Systems with Limited Satellite Backhaul

Authors:
Ruijin Sun
Ying Wang
Yichun Xu

Keywords: energy efficiency; backhaul limit; power allocation

Abstract:
Emergency communications can benefit from the integrated aerial-satellite systems due to the frequent Line Of Sight (LOS) access for User Equipments (UEs) and the robust satellite backhaul. This paper addresses an energy efficiency power allocation problem for a OFDM-based aerial system with limited satellite backhaul. Due to the non-convex backhaul capacity limit, the optimization problem is solved in two steps. Firstly, a non-negative parameter is introduced to convert the objective function to an equivalent convex form according to the fractional programming. Then, the optimal parameter for maximum Energy Efficiency (EE) without total power and backhaul capacity constraints is obtained. Secondly, by proving that the derivative of R(Ptot) is equal to the above introduced parameter, which is decreasing in total power limit, Ptot, these two constraints can be transformed into a lower bound on the parameter through geometric interpretation. Thus, an energy efficiency power allocation algorithm is proposed. Finally, numerical results show that the circuit power, total power limit and backhaul capacity limit have effect on the system EE.

Pages: 58 to 62

Copyright: Copyright (c) IARIA, 2015

Publication date: April 19, 2015

Published in: conference

ISSN: 2308-4480

ISBN: 978-1-61208-397-1

Location: Barcelona, Spain

Dates: from April 19, 2015 to April 24, 2015