EXIT Chart Analysis and PerformanceEvaluation of Cooperative NOMA Systems

Volume: 11 | Issue: 02 | Year 2025 | Subscription
International Journal of Broadband Cellular Communication
Received Date: 08/27/2025
Acceptance Date: 09/03/2025
Published On: 2025-12-30
First Page: 21
Last Page: 30

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By: Gazal Sinha, Sandeep Ojha, and Alok Kumar Mishra.

Student, Department of Electronics and Communication Engineering, Rameshwaram Institute of Technology and Management, Lucknow, India
Assistant Professor, Department of Electronics and Communication Engineering, Rameshwaram Institute of Technology and Management, Lucknow, India

Abstract

This paper conducts a comprehensive performance analysis of Cooperative Non-Orthogonal Multiple Access (NOMA) systems through the application of Extrinsic Information Transfer (EXIT) chart analysis, a tool widely used for visualizing the iterative decoding process in communication systems. The proposed system integrates Successive Interference Cancellation (SIC), Multi-User Detection (MUD), and spreading techniques to enhance the reliability and efficiency of data transmission. In this cooperative framework, the near user (NU), having stronger channel conditions, assists the far user (FU) by acting as a decode-and-forward relay. This cooperation significantly mitigates the limitations of traditional power-domain NOMA, such as unfair power distribution and high bit error rates for weak users. Simulation results highlight the superiority of the cooperative model over non-cooperative NOMA in terms of Bit Error Rate (BER) and system throughput, especially in low Signal-to-Noise Ratio (SNR) scenarios. The EXIT chart analysis is employed to assess the mutual information exchange between the MUD and channel decoders during iterative processing. The results demonstrate clear convergence behaviour, with the EXIT curves forming an open tunnel that reaches the optimal [1,1] point without intersection. This indicates error-free transmission and optimal performance. The findings confirm that cooperative NOMA, when analysed through EXIT charts, provides improved user fairness and effective power allocation.

Keywords : Cooperative NOMA, SIC, EXIT Chart, Multi-User Detection, Throughput Analysis, BER, User Fairness, Spreading Factor

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Citation:

How to cite this article: Gazal Sinha, Sandeep Ojha, and Alok Kumar Mishra EXIT Chart Analysis and PerformanceEvaluation of Cooperative NOMA Systems. International Journal of Broadband Cellular Communication. 2025; 11(02): 21-30p.

How to cite this URL: Gazal Sinha, Sandeep Ojha, and Alok Kumar Mishra, EXIT Chart Analysis and PerformanceEvaluation of Cooperative NOMA Systems. International Journal of Broadband Cellular Communication. 2025; 11(02): 21-30p. Available from:https://journalspub.com/publication/ijbcc/article=22567

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