A centralized iterative water filling algorithm in coordinated multipoint OFDMA network

In the wireless mobile communication system, the performance of system throughput is seriously affected by the interference, which can be divided into intra-cell and inter-cell interference. Intra-cell interference could be refrained by orthogonal frequency-division multiple-access (OFDMA). Coordinated multipoint (CoMP) transmission is an effect way to decrease inter-cell interference. A CIWF algorithm is proposed to maximize the system throughput subjected to per-BS power constraint (PBPC) in the downlink OFDMA cellular network supporting CoMP transmission. In this algorithm, co-channel users are selected and the power allocated by per resource block is computed with the confirmation of an analytical derivation. Simulation results demonstrate that the proposed algorithm outperforms traditional ones from the aspect of throughput.