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Cooperative uplink OFDMA-MIMO resource allocation with multiplexing relays

We investigate in this paper the resource allocation problem in an uplink cooperative MIMO OFDMA multiuser system. This system may be used in 5G in the context of green communications since we aim to save energy by reducing the system transmit power. We focus on multiplexing Decode and Forward (DF) relays that have their own data to transmit in addition to data to relay. Aiming to minimize the system transmit power with a required target data rate per user, the resource allocation problem is formulated as an optimization problem. The feature to optimize are relay selection, power allocation and resource block (RB) allocation. We propose a novel resolution algorithm based on dual method and Lagrangian decomposition. Moreover, at each user, Equal Power Allocation (EPA) and beamforming are studied and compared to allocate power to antennas. Simulation results show that the cooperative proposed algorithm leads to an important improvement comparing to a non-cooperative system.