Combining coded signals with arbitrary modulations in orthogonal relay channels

Brice Djeumou (1) , Samson Lasaulce (1) , Antoine Berthet (2)

1 L2S - Laboratoire des signaux et systèmes
2 SUPELEC-Campus Gif

We consider a relay channel for which the following assumptions are made. (1) The source-destination and relay-destination channels are orthogonal (frequency division relay channel). (2) The relay implements the decode-and-forward protocol. (3) The source and relay implement the same channel encoder, namely, a onvolutional encoder. (4) They can use arbitrary and possibly different modulations. In this framework, we derive the best combiner in the sense of the maximum likelihood (ML) at the destination and the branch metrics of the trellis associated with its channel decoder for the ML combiner and also for the maximum ratio combiner (MRC), cooperative-MRC (C-MRC), and the minimum mean-square error (MMSE) combiner.

Mots clés: decode-and-forward; convolutionnal codes; minimum mean squared error (MMSE); maximum likelihood (ML).; maximum likelihood (ML)

Domaines: Théorie de l'information et codage [math.IT]

Brice Djeumou, Samson Lasaulce, Antoine Berthet. Combining coded signals with arbitrary modulations in orthogonal relay channels. EURASIP Journal on Wireless Communications and Networking, 2008, 2008 (Article ID 287320, 4 pages), ⟨10.1155/2008/287320⟩. ⟨hal-00361518⟩