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In this paper, we propose a non-orthogonal multiple access scheme based on multiuser orthogonal frequency division multiplexing system to reduce the total transmit power. In this system, each subcarrier can be assigned to two users for data transmission and transmits data with a lower order of a modulation mode. Because the system is based on orthogonal frequency division multiple access, a primary...
In this paper, we propose a new setup for a cooperative multi-relay non-orthogonal multiple access scheme (CMR-NOMA) to enhance the downlink performance of non-orthogonal multiple access, while operating in severe fading. We compare the performance of the proposed scheme to an existing cooperative non-orthogonal multiple access scheme (CNOMA) in terms of the user-average bit error rate, the ergodic...
The non-orthogonal multiple access (NOMA) allows one subcarrier to be allocated to more than one user at the same time in an orthogonal frequency division multiplexing (OFDM) system. NOMA is a promising technique to provide high throughput due to frequency reuse within a cell. In this paper, a novel interference cancellation (IC) technique is proposed for asynchronous NOMA systems. The proposed IC...
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