Low overhead NOMA receiver with automatic modulation classification techniques

• Published in: IET communications Vol. 14; no. 5; pp. 768 - 774
• Main Authors: Naderpour, Masoud, Khaleghi Bizaki, Hossein
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 17.03.2020
• Subjects: 5G cellular networks; 5G mobile communication; AMC algorithm error probability; automatic modulation classification algorithm; automatic modulation classification techniques; cellular radio; conventional receiver; error statistics; high overhead signalling; interference suppression; low overhead NOMA receiver; modulation; multi‐access systems; nonorthogonal multiple access technique; predefined number; radiofrequency interference; Research Article; serial interference cancellation; spectral efficiencies; symbol detection; transmitter maps; TU‐NOMA case; two‐user NOMA scheme; user symbols; interference suppression; 5G mobile communication; modulation; predefined number; 5G cellular networks; transmitter maps; conventional receiver; two-user NOMA scheme; serial interference cancellation; spectral efficiencies; high overhead signalling; automatic modulation classification algorithm; radiofrequency interference; AMC algorithm error probability; automatic modulation classification techniques; symbol detection; nonorthogonal multiple access technique; multi-access systems; TU-NOMA case; low overhead NOMA receiver; user symbols; cellular radio; error statistics
• ISSN: 1751-8628; 1751-8636; 1751-8636
• DOI: 10.1049/iet-com.2018.5099

Recently non-orthogonal multiple access (NOMA) technique has been proposed for boosting spectral efficiencies in 5G cellular networks. In NOMA the transmitter maps a predefined number of user symbols on to the same resources. The conventional receiver for NOMA is the well-known serial interference cancellation. To overcome the problem of high overhead signalling, a receiver with an automatic modulation classification (AMC) algorithm for a K-user NOMA which identifies the modulation scheme of users before symbol detection is proposed. First, a two-user NOMA (TU-NOMA) scheme is treated and the receiver is extended to more general cases. For evaluating the performance of the proposed receiver its bit error rate (BER) for TU-NOMA case has been driven and shown that this can be approximated as the sum of the demodulator BER and the AMC algorithm error probability. The simulation results show the BER degradation can be neglected if an enough number of symbols with sufficiently large SNR values are available.