Abstract
As a green wireless network access framework, cloud radio access network (C-RAN) has the advantages of reducing energy consumption and improving spectral efficiency. In this paper, we propose to maximize the energy efficiency (EE) in the downlink of the C-RAN. We propose a design of beamforming and rate allocation based on generalized nonorthogonal multiple access (G-NOMA) by using the central cooperation and local coordination across the base transceiver stations (BTSs) in the C-RAN downlink. Our aim is to maximize the EE with the constraints of each BTS power consumption and the minimum quality of service (QoS) requirements, which we propose to solve by an efficient and low complexity successive convex approximation (SCA) algorithm. Simulation results demonstrate that the G-NOMA scheme can effectively achieve the best energy efficiency.
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