Rate Allocation for Cooperative Transmission in Parallel Channels
Joe Cho Yiu Ng, Chi Wan Sung, Kenneth W. Shum · 2007
In this paper, we consider cooperative transmission between two source and destination pairs. Exchange of data is allowed between the two source nodes. In addition to the direct transmission link from the source to the intended destination, we have a two-hop relay link that sends the data via the neighboring source node. We partition the bandwidth into two parts, and each part is utilized by one source node, such that the transmissions from the two sources are orthogonal to each other. In this way, the cooperative interference channel is reduced to two independent broadcast channels. The bandwidth of each source node is divided into orthogonal sub-channels, and results from parallel broadcast channel is used to find the optimal allocation of power and rate to each links. We propose an iterative algorithm that maximizes the weighted sum rate, and plot the achievable rate region.