Abstract
In Non-orthogonal multiple access (NOMA) system, different users utilize the same time and frequency resource to achieve a higher spectral efficiency. However, for conventional NOMA multiplexing in the power domain, the number of users carried in the system is very limited due to the requirement of perfect interference cancelation in the successive decoding. In this paper, we propose a novel NOMA scheme based on user grouping and multiple layer modulation with constellation scaling and rotation. Users are first grouped according to their channel conditions, and transmit power is allocated among the groups. Then multiple layer modulation is employed within each group where each user is identified by a unique rotation parameter. Simulation results in terms of bit error rate (BER) are provided. Compared to the conventional NOMA scheme, the proposed scheme can afford a larger number of users under the same power constraints, and it has clear advantages in both system throughput and BER performance.
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