Title :
Power Allocation for OFDM Transmission with DF Relaying
Author :
Vandendorpe, Luc ; Durán, Rodolfo Torrea ; Louveaux, âJérome ; Zaidi, Abdellatif
Author_Institution :
Commun. & Remote Sensing Lab., Univ. Catholique de Louvain, Louvain-la-Neuve
Abstract :
We consider OFDM (orthogonal frequency division multiplexing) transmission helped by a relay. Symbols sent by the source may or may not be retransmitted by a relay during a second time slot. The relay is supposed to operate in Decode-and-Forward (DF) mode. For each carrier the destination implements maximum ratio combining. Assuming perfect CSI (channel state information) knowledge the paper investigates the power allocation problem for rate maximization of the scheme. Both cases of a sum power constraint, and of individual power constraints at the source and at the relay are tackled. The theoretical analysis is illustrated by numerical results for both types of constraints.
Keywords :
OFDM modulation; radio links; DF relaying; OFDM transmission; channel state information; decode-and-forward mode; orthogonal frequency division multiplexing; point to point link; power allocation problem; rate maximization; sum power constraint; Channel state information; Communications Society; Constraint theory; Costs; Decoding; Laboratories; OFDM; Power system relaying; Relays; Remote sensing;
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
DOI :
10.1109/ICC.2008.713
