Journal
IEEE COMMUNICATIONS LETTERS
Volume 24, Issue 12, Pages 2705-2709Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2020.3020161
Keywords
NOMA; Quadrature amplitude modulation; Bit error rate; Manganese; Silicon carbide; Lead; Non-orthogonal multiple access (NOMA); bit error rate (BER); joint detection; multiuser detection; successive interference cancellation (SIC); quadrature amplitude modulation (QAM)
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Funding
- Khalifa University under the flagship project entitled MUSES: Multiuse Space Energy Systems [8474000026]
- KU Center for CyberPhysical Systems [C2PS-T2]
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This letter considers the exact bit error rate (BER) analysis of a two-user non-orthogonal multiple access (NOMA) system using square quadrature amplitude modulation (QAM). Unlike existing work, no constraints are imposed on the modulation order of the QAM symbols for any user. Closed-form expressions are derived for the BER of the successive interference cancellation (SIC) receiver in Raleigh fading channels. The analytical BER results corroborated by Mote Carlo simulation show that the power control becomes challenging for high order QAM. Moreover, the BER of each user is approximately independent of the modulation scheme used by the other user for certain power settings.
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