On the Energy Efficiency Optimality of OFDMA for SISO-OFDM Downlink System

Author

Qingjiang Shi ; Weiqiang Xu ; Dapeng Li ; Yaming Wang ; Xiaowei Gu ; Wenshu Li

Author_Institution

Sch. of Inf. Sci. & Tech., Zhejiang Sci-Tech Univ. (ZSTU), Hangzhou, China

Volume

17

Issue

3

fYear

2013

fDate

Mar-13

Firstpage

541

Lastpage

544

Abstract

This letter considers energy-efficient resource allocation for a general SISO-OFDM downlink system. A fundamental result is proven that OFDMA is optimal for achieving the maximum energy efficiency measured by bits per joule. Using the OFDMA solution structure, we turn the nonconvex energy-efficient power allocation problem into a quasi-convex optimization problem and propose an efficient power allocation algorithm which requires solving at most two simple subproblems. The achieved energy efficiency performance of the proposed power allocation algorithm is verified via simulations.

Keywords

OFDM modulation; frequency division multiple access; resource allocation; OFDMA; SISO-OFDM downlink system; energy-efficient resource allocation; nonconvex energy-efficient power allocation; quasi-convex optimization; Downlink; OFDM; Optimization; Resource management; System analysis and design; Throughput; Wireless communication; Energy—efficient resource allocation; OFDMA; SISO—OFDM downlink system;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2013.020413.122898

Filename

6459491