Energy-efficient Resource Allocation Based on Multi-user Massive MIMO System
Hu Ying①② Huang Yong-ming① Yu Fei① Yang Lu-xi①
①(School of Information Science and Engineering, Southeast University, Nanjing 210096, China) ②(Institute of Electronics and Information, Jiangsu University of Science and Technology, Zhenjiang 212003, China)
An energy-efficient resource allocation scheme is proposed for multi-user massive MIMO mobile communication uplink system. A mathematical formulation of optimization issue is provided with the objective of maximizing system energy efficiency lower bound under the data rate of user and tolerable interference level constraint, meanwhile the Base Station (BS) uses a Maximum-Ratio Combining (MRC) receiver. By transforming the originally fractional optimization problem into an equivalent subtractive form using the properties of fractional programming, then convex optimization is adopted to maximize the energy efficiency. Specifically, both the numbers of antenna arrays at the BS and the transmit data rate at the user are adjusted. Simulation results show that the energy-efficiency difference between the proposed algorithm and the exhaustive algorithm is less than 9%, at the same time, the performance of spectral-efficiency of the proposed algorithm is very well and the complexity is significantly reduced.
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