Adaptive resource allocation in multiuser cooperative networks with proportional rate constraints

In this paper, the uplink scenario of multi-user cooperative network is considered, in which the resource is allocated to the users with the balance of the trade-off between system capacity and user fairness. Proportional fairness was considered, which imposed a set of nonlinear constraints into the optimisation problem. We show that the optimisation problem is formulated as a mixed binary integer programming problem, which is hard to find the global optimum in terms of computational complexity. For practise implementation, we decomposed the optimisation problem into two sub-problems of opportunistic relaying strategy and power allocation. First, the opportunistic relay selection strategy is given by making use of the equivalent channel power gain. Second, a low-complexity power allocation scheme is proposed. The simulation result shows that the proposed scheme can both improve the system throughput and ensure the fairness.