Performance evaluation of Non‐Orthogonal multiple access system based on outage probability and power consumption

• Published in: International journal of communication systems Vol. 37; no. 11
• Main Authors: Chandra, Kothapalli Ramesh, Borugadda, Somasekhar
• Format: Journal Article
• Language: English
• Published: Chichester Wiley Subscription Services, Inc 25.07.2024
• Subjects: 5G mobile communication; Communication; encoding and decoding; Gaussian noise; Interference; Nonorthogonal multiple access; outage probability; Outages; Performance evaluation; power allocation; Power consumption; Power transfer; successive interference cancelation; superposition coding
• ISSN: 1074-5351; 1099-1131
• DOI: 10.1002/dac.5792

Summary In this growing world, the field of communication is developing quickly. The research community's attention is shifting to the design of networks beyond fifth generation (5G) and the sixth generation (6G) due to the rapid spread of the 5G mobile networks. Due to that, there will be a lot of traffic in the area, which will interfere with the channels and maybe produce noise. Nonorthogonal multiple access (NOMA) contributes to streamlined communication and a decrease in the possibility of interference. The communication will be encoded and decoded from transmitter to receiver utilizing the superposition coding (SC) and successive interference cancelation (SIC) approaches, ensuring the message's secrecy. This paper considers a simultaneous wireless information and power transfer (SWIPT)‐based cooperative NOMA system, where the nearby user to the source node acts as a relay to assist the far user. To further enhance the system performance, an improved golden search optimization (IGSO) is used to determine the best power allocation and power splitting coefficients by decreasing the outage probability. The existing models are compared with the proposed model in the results section regarding outage probability and throughput, where the proposed model outperformed all other existing models. Highlights The analytical representations of the outage probabilities are derived for far and nearby users of simultaneous wireless information and power transfer (SWIPT)‐based cooperative nonorthogonal multiple access (NOMA) system. A new lightweight algorithm is introduced to reduce the outage probabilities over optimal time switching factor and power allocation factors, and it maintains user fairness. A new two‐stage enhanced golden search optimization (IGSO) algorithm is proposed for the joint optimization of the time division factor and the power allocation factor without the need for complicated derivative calculation. It evaluates all solutions in the solution set using the objective function alone. According to the numerical results, the proposed technique significantly improves the performance of the nearby user and significantly increases the system throughput.