On the Stability Region of Amplify-and-Forward Cooperative Relay Networks

Details On the Stability Region of Amplify-and-Forward Cooperative Relay Networks On the Stability Region of Amplify-and-Forward Cooperative Relay Networks

2008-12-31

arxiv.org/abs/0901.0118v2

Computer Science

Information Theory

accepted for presentation at ITW 2009, Taormina, Sicily

Scientific paper

This paper considers an amplify-and-forward relay network with fading states. Amplify-and-forward scheme (along with its variations) is the core mechanism for enabling cooperative communication in wireless networks, and hence understanding the network stability region under amplify-and-forward scheme is very important. However, in a relay network employing amplify-and-forward, the interaction between nodes is described in terms of real-valued ``packets'' (signals) instead of discrete packets (bits). This restrains the relay nodes from re-encoding the packets at desired rates. Hence, the stability analysis for relay networks employing amplify-and-forward scheme is by no means a straightforward extension of that in packet-based networks. In this paper, the stability region of a four-node relay network is characterized, and a simple throughput optimal algorithm with joint scheduling and rate allocation is proposed.

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