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Energy and Spectrum Efficiency Trade-off of Non-Orthogonal Multiple Access (NOMA) over OFDMA for Machine-to-Machine Communication

With the expectation of over a 1000- fold increase in the connection of devices by 2020, effective utilization of Energy and Spectrum efficiency has become ever more important in the design of mobile wireless systems. Fifth generation (5G) networks are considered as a key paradigm for the realization of future Machine-to-Machine (M2M) communications. Particularly, Nonorthogonal multiple access (NOMA) can be a suitable technology for 5G networks that can improve energy efficiency and spectral efficiency outperforming existing Orthogonal Frequency Multiple access technique (OFDMA) and can accommodate a huge count of Machine-to-Machine communication devices. In this paper, energy and spectrum efficiency (EE-SE) of NOMA and OFDMA techniques are compared with respect to variation of system bandwidth. Simulation results demonstrate that the NOMA technique outperforms the prevailing OFDMA technique with respect to energy and spectrum efficiency, thus is a promising technology in future M2M communications.