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Wireless Personal Communications

, Volume 109, Issue 3, pp 1541–1556 | Cite as

Cross Layer Power Control and User Pairing for DL Multi-antenna NOMA

  • Shu-Ming TsengEmail author
  • Yung-Fang Chen
  • Kuan-Cheng Liu
Article
  • 27 Downloads

Abstract

In a previous study, Kim et al. proposed a suboptimal user pairing and optimal power control algorithm for maximizing sum capacity in downlink multi-antenna non-orthogonal multiple access (NOMA) systems. First, Kim et al. calculate the correlation between all users. If the channel correlation is greater than the threshold, the user’s channel gain difference is stored in the channel gain-difference set. Then, the first and second large channel gain-differences of the user pairs are selected from the set. Based on the user pairing of Kim et al. in the physical layer, we propose novel iterative user substitution algorithm where a user is substituted if the peak signal-to-noise ratio (PSNR), the video quality, in the application layer increases after substitution. And we propose an optimal power control that minimizes the sum video distortion to maximize PSNR in the application layer. The numerical results show that the proposed cross layer optimal power control and user substitution outperforms Kim et al. by 1.4 dB in PSNR and only 1 dB away from exhaustive upper bound, when SNR = 15 dB and the number of users is 16.

Keywords

Mean square error (MSE) Downlink non-orthogonal multiple access (NOMA) Peak signal-to-noise ratio (PSNR) Power control User pairing 

Notes

Acknowledgements

This work was supported in part by the Ministry of Science and Technology, Taiwan, under Grant MOST 108-2221-E-027-033.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Electronic EngineeringNational Taipei University of TechnologyTaipeiTaiwan
  2. 2.Department of Communication EngineeringNational Central UniversityTaoyuanTaiwan

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