Research On Resource Allocation Algorithm Of OFDMA System Based On Energy Efficiency

Orthogonal frequency division multiple access(OFDMA), has been extensively studied as key technique for the next generation wireless communication systems, such as WiMAX and the 3GPP LTE. With the improvement of the network’s performance and the rapid growth of communication energy consumption, how to reasonably allocate the resources, reduce the waste, with the guarantee of Quality of Services, which has gradually become the focus of the wireless communication system’s research. So it is indispensable to study algorithms about the energy-efficient resource allocation in OFDMA systems.The paper studies the energy-efficient resource allocation in downlink cellular networks with OFDMA, formulates the module of downlink case, and introduces the optimal solution. The sub-optimal but low-complexity approaches with the assistant with the energy efficiency, the power or the mean channel gain, are been deducted and analyzed, which is partly been improved in PM’s complexity and MPDF’s performance. Then, the module of uplink cellular network is built, from the angle of the maxming energy efficiency of jointing assignment of power and sub-carriers, we discuss the EE-assistant MUSA, combining minimum power algorithm with the foundation of previous study of energy- and spectral- efficiency trade-off, BMTP_ME is been proposed; In the layers-separated part, we modify MPDF as MPD_ME for the uplink case, which is processed by power’s assistant; The scenario with discrete rate constraint is investigated, the module of the spectral efficiency is been built, the analysis of DRSCA is made. At last, based on the rational estimation of power consumption, the metric in Miao is revised which has better energy efficiency performance than the proportional fair scheduling algorithm with the assertion of simulation.