Abstract
Machine-type communications (MTC) is an important standardized technology in the fifth generation (5G) cellular networks, where a vast number of MTC devices communicate on the limited band. Due to the large number of MTC devices in MTC systems, the traditional OMA method seems very weak to provide enough connection for MTC devices. Thus a joint subcarriers and power allocation problem using power-domain non-orthogonal multiple access (NOMA) is formulated to allow multiple MTC devices to share the same subcarrier in this paper. And the problem is decomposed into two sub-problems so that it can be easy to solve. And two algorithms are proposed for these sub-problems to maximize the number of successfully connected MTC devices. The simulation results show that our proposed scheme can effectively improve the access opportunity of MTC devices compared to the existing schemes.
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