Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Power Allocation Scheme to Enhance Data-Rate Fairness for Non-orthogonal Multiple Access Systems in the Presence of Interference

간섭이 존재하는 비직교 다중접속 시스템에서 데이터 전송률 공정성 개선을 위한 전력 할당 기법

  • Lee, In-Ho (Department of Electrical, Electronic and Control Engineering, Hankyong National University)
  • Received : 2019.07.18
  • Accepted : 2019.09.07
  • Published : 2019.11.30
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Abstract

In this paper, we assume that another transmitter can transmit its data signal in the same frequency band in order to maximize the frequency efficiency of non-orthogonal multiple access(NOMA) systems. We also focus on the improvement in fairness performance of receiver's data rates, not the maximization of sum data rate for NOMA systems. Thus, in this paper, we propose a power allocation scheme to enhance the fairness performance of average data rates of receivers considering the NOMA systems in the presence of interference. Assuming Rayleigh fading channels, the average data rates of receivers are defined, and the power allocation coefficients to improve the data-rate fairness are derived by using high signal-to-noise power ratio approximation. In addition, through simulations, it is shown that the proposed power allocation scheme can improve the data-rate fairness in the NOMA system with interference.

본 논문에서는 비직교 다중접속 시스템의 주파수 효율성 최대화를 위하여 다른 송신기가 동일한 주파수 대역에서 신호를 전송할 수 있다고 가정한다. 그리고 비직교 다중접속 시스템의 총 데이터 전송률의 최대화가 아닌 수신기의 데이터 전송률의 공정성 성능 개선에 집중한다. 따라서 본 논문에서는 간섭이 존재하는 비직교 다중접속 시스템을 고려하여 수신기의 평균 데이터 전송률에 대한 공정성 성능을 개선하기 위한 전력 할당 기법을 제안한다. 레일레이 페이딩 채널을 가정하여 수신기의 평균 데이터 전송률을 정의하고, 높은 신호 대 잡음비의 근사법을 이용하여 평균 데이터 전송률의 공정성 성능을 개선하기 위한 전력 할당 계수를 유도한다. 또한, 시뮬레이션을 통해 제안하는 전력 할당 기법이 간섭을 갖는 비직교 다중접속 시스템에서 데이터 전송률의 공정성 성능을 개선할 수 있음을 보인다.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (Grant number: NRF-2018R1D1A1B07042499).

References

  1. Z. Ding, Z. Yang, P. Fan, and H. V. Poor, "On the performance of non-orthogonal multiple access in 5G systems with randomly deployed users," IEEE Signal Processing Letters, vol. 21, no. 12, pp. 1501-1505, Dec. 2014. https://doi.org/10.1109/LSP.2014.2343971
  2. I.-H. Lee, "Symbol error rate analysis for fixed multi-user superposition transmission in Rayleigh fading channels," Journal of the Korea Institute of Information and Communication Engineering, vol. 22, no. 10, pp. 1379-1385, Oct. 2018. https://doi.org/10.6109/JKIICE.2018.22.10.1379
  3. Y. Yu, H. Chen, Y. Li, Z. Ding, L. Song, and B. Vucetic, "Antenna selection for MIMO non-orthogonal multiple access systems," IEEE Transactions on Vehicular Technology, vol. 67, no. 4, pp. 3158-3171, Apr. 2018. https://doi.org/10.1109/TVT.2017.2777540
  4. Z. Yang, Z. Ding, Y. Wu, and P. Fan, "Novel relay selection strategies for cooperative NOMA," IEEE Transactions on Vehicular Technology, vol. 66, no. 11, pp. 10114-10123, Nov. 2017. https://doi.org/10.1109/TVT.2017.2752264
  5. Y. Liu, Z. Qin, M. Elkashlan, A. Nallanathan, and J. A. McCann, "Non-orthogonal multiple access in large-scale heterogeneous networks," IEEE Journal on Selected Areas in Communications, vol. 35, no. 12, pp. 2667-2680, Dec. 2017 https://doi.org/10.1109/JSAC.2017.2726718
  6. T. M. Nguyen, W. Ajib, and C. Assi, "A novel cooperative NOMA for designing UAV-assisted wireless backhaul networks," IEEE Journal on Selected Areas in Communications, vol. 36, no. 11, pp. 2497-2807, Nov. 2018. https://doi.org/10.1109/JSAC.2018.2874136
  7. I.-H. Lee, "Power allocation to improve data-rate fairness of non-orthogonal multiple access users," accepted in Journal of the Korea Institute of Information and Communication Engineering, 2019.
  8. X. Wang, H. Zhang, Y. Tian, and K. J. Kim, "Performance analysis of aerial base station assisted cooperative communication systems," in Proceeding of IEEE Vehicular Technology Conference, Kuala Lumpur, Malaysia, pp. 1-5, 2019.
  9. I. S. Gradshteyn, and I. M. Ryzhik, Table of Integrals, Series, and Products, 7th ed. New York, Academic Press, 2007.