Improved OFDM transmission with DF relaying and power allocation for a sum power constraint

Author

Vandendorpe, Luc ; Louveaux, Jerome ; Oguz, Onur ; Zaidi, Abdellatif

Author_Institution

Commun. & Remote Sensing Lab., Univ. Catholique de Louvain, Louvain-la-Neuve

fYear

2008

fDate

7-9 May 2008

Firstpage

665

Lastpage

669

Abstract

In this paper we consider an OFDM (orthogonal frequency division multiplexing) transmission scheme with a relay. Symbols sent by the source may or may not be retransmitted during a second time slot by the relay, which is assumed to be of the decode-and-forward (DF) type. For each relayed carrier the destination implements maximum ratio combining. Assuming perfect CSI (channel state information) knowledge the paper investigates the power allocation problem in order to maximize the rate offered by the scheme. Compared to [VDLZ08], the second time slot is better used. The source is allowed to transmit a new symbol during this second time slot when the relay is inactive. The optimization is performed for a sum power constraint. The theoretical analysis is illustrated by numerical results.

Keywords

OFDM modulation; channel allocation; decoding; diversity reception; optimisation; OFDM transmission; channel state information; decode-forward relaying; maximum ratio combining; optimization; orthogonal frequency division multiplexing; power allocation; sum power constraint; Channel state information; Constraint optimization; Decoding; Frequency modulation; Laboratories; OFDM; Power system relaying; Protocols; Relays; Remote sensing;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Pervasive Computing, 2008. ISWPC 2008. 3rd International Symposium on

Conference_Location

Santorini

Print_ISBN

978-1-4244-1652-3

Electronic_ISBN

978-1-4244-1653-0

Type

conf

DOI

10.1109/ISWPC.2008.4556293

Filename

4556293