Joint Allocation of Power and Subcarriers for OFDMA Relay Network

In this paper, an effective joint allocation of power and subcarriers is proposed under the total power constraint, aiming to maximize the capacity of OFDMA relaying network. In DF (decode and forward) scheme, an equivalent transmit rate formulation is developed, optimal power allocation is obtained by linear optimization and Lagrange multiplier method. By using this optimal power allocation, an efficient heuristic subcarrier pairing algorithm is proposed, the joint allocation of them is presented to further improve capacity. Simulation result ensures that the proposed joint allocation enhances capacity significantly with low computing complexity.