Resource allocation for downlink two-user OFDMA systems with wireless network coding

Author

Tarasak, Poramate ; Sun, Sumei

Author_Institution

Inst. for Infocomm Res., Agency for Sci. Technol. & Res. (A*STAR), Singapore, Singapore

fYear

2011

fDate

26-29 June 2011

Firstpage

261

Lastpage

265

Abstract

We first address a sum-rate maximization problem under a sum-power constraint. By introducing the concept of virtual user, we solve the problem by using the Lagrange dual method. We then look into a sum-power minimization problem under sum-rate constraints. The Lagrange dual method and an exhaustive search method are proposed, which achieve similar performance, but the former has a lower complexity. Our simulation shows about 3-dB power saving of our scheme over an OFDMA system without network coding.

Keywords

OFDM modulation; channel allocation; frequency division multiple access; network coding; optimisation; radio networks; Lagrange dual method; OFDMA; exhaustive search method; resource allocation; sum-power constraint; sum-power minimization; sum-rate maximization problem; virtual user; wireless network coding; Encoding; Minimization; Network coding; Resource management; Search methods; Signal to noise ratio; Wireless networks;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Advances in Wireless Communications (SPAWC), 2011 IEEE 12th International Workshop on

Conference_Location

San Francisco, CA

ISSN

1948-3244

Print_ISBN

978-1-4244-9333-3

Electronic_ISBN

1948-3244

Type

conf

DOI

10.1109/SPAWC.2011.5990408

Filename

5990408