Cooperative Strategies for the Half-Duplex Gaussian Parallel Relay Channel: Simultaneous Relaying versus Successive Relaying
Seyed Saeed Changiz Rezaei, Shahab Oveis Gharan, Amir Keyvan Khandani · 2008
This paper deals with the problem of cooperative communication for a network with multiple halfduplex relays. Two half-duplex relaying protocols, i.e. simultaneous and successive relaying protocols, associated with two possible relay orderings for a half-duplex parallel relay network are proposed. The optimum ordering of the relays and hence the capacity of the Gaussian half-duplex parallel relay network in high SNR scenarios is derived. Furthermore, for the simultaneous relaying protocol a combined Amplify-Forward and Decode-Forward (AF-DF) scheme is devised which gives a better achievable rate with respect to other known schemes in certain ranges of SNR.