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This paper proposes a new medium access control (MAC) protocol for Internetof Things (IoT) applications incorporating pure ALOHA with power domainnon-orthogonal multiple access (NOMA) in which the number of transmitters arenot known as a priori information and estimated with multi-hypothesis testing.The proposed protocol referred to as ALOHA-NOMA is not only scalable, energyefficient and matched to the low complexity requirements of IoT devices, but italso significantly increases the throughput. Specifically, throughput isincreased to 1.27 with ALOHA-NOMA when 5 users can be separated via a SIC(Successive Interference Cancellation) receiver in comparison to the classicalresult of 0.18 in pure ALOHA. The results further show that there is a greaterthan linear increase in throughput as the number of active IoT devicesincreases.

ALOHA-NOMA for Massive Machine-to-Machine IoT Communication