A Novel Interference Cancellation Technique for Non-Orthogonal Multiple Access (NOMA)

In this paper, a novel interference cancellation (IC) technique is proposed for asynchronous non-orthogonal multiple access (NOMA) systems. The bit error rate (BER) performance of an uplink NOMA system with the proposed IC technique is presented. Numerical and simulation results have shown that NOMA with the proposed asynchronous IC technique outperforms NOMA with a conventional-IC technique for uplink transmissions. It is also shown that employing iterative IC provides significant performance gain in NOMA and the number of required iterations depends on the modulation level and the received power ratio between users.