Cooperative protocols for multiple-source multiple-relay wireless networks
Jun Zhang, Tat-Ming Lok · International Journal of Sensor Networks · 2008
In this paper, we study the cooperative communications in wireless systems with ns source nodes, nr relay nodes and single destination node. We propose cooperative protocols and analyse the system performance of the cooperation systems. For ns = 1, nr > 1, the nodes cooperate in a repetition way. The impact of the detection error at the relay node on the system performance is analysed, and then a relay selection protocol is proposed to compensate for such effect. For ns > 1, nr > 1, we propose a cooperative coding protocol, in which the relay nodes not only decode and forward the symbols from the source nodes, but also encode the incoming symbols according to the pre-assigned cooperative code. This brings higher efficiency and flexibility compared with the repetition-coded cooperation system with single source node. The analysis and the simulation results demonstrate that the proposed system achieves full diversity order.