Abstract
Non-orthogonal multiple access (NOMA) is a candidate multiple access scheme for the fifth-generation (5G) cellular networks. In NOMA systems, all users operate at the same frequency and time, which poses a challenge in the decoding process at the receiver side. In this work, the two most popular receiver structures, successive interference cancellation (SIC) and parallel interference cancellation (PIC) receivers, for NOMA reverse channel are implemented on a graphics processing unit (GPU) and compared. Orthogonal frequency division multiplexing (OFDM) is considered. The high computational complexity of interference cancellation receivers undermines the potential deployment of NOMA systems. GPU acceleration, however, challenges this weakness, and our numerical results show speedups of about from 75–220-times as compared to a multi-thread implementation on a central processing unit (CPU). SIC and PIC multi-thread execution time on different platforms reveals the potential of GPU in wireless communications. Furthermore, the successful decoding rates of the SIC and PIC are evaluated and compared in terms of bit error rate.
Highlights
Non-orthogonal multiple access (NOMA) in the power domain has been proposed as a promising multiple access technique for the upcoming fifth-generation cellular networks
In NOMA systems, since each user is seen as an interference to others, advanced interference cancellation is required for successful decoding [5]
Successive interference cancellation (SIC) and parallel interference cancellation (PIC) techniques are considered for NOMA
Summary
Non-orthogonal multiple access (NOMA) in the power domain has been proposed as a promising multiple access technique for the upcoming fifth-generation cellular networks. In the reverse link of a NOMA system, each user transmits at the same time and in the frequency band so that the base station receives the superimposed version of the transmitted signals by each user. This is in contrast to the multiple access methods used in conventional cellular systems where one user is allocated per time slot or frequency unit [2]. Successive interference cancellation (SIC) and parallel interference cancellation (PIC) techniques are considered for NOMA In addition to their computation performances, the reliability of the transmission with SIC and PIC receivers may differ [7].
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