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Power allocation in the energy harvesting full-duplex Gaussian relay channels

Feghhi, M. M ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1002/dac.2903
  3. Publisher: John Wiley and Sons Ltd , 2017
  4. Abstract:
  5. In this paper, we propose a general model to study the full-duplex non-coherent (NC) decode-and-forward Gaussian relay channel (RC) with energy harvesting (EH) nodes, called NC-EH-RC, in three cases: (i) no energy transfer (ET), (ii) one-way ET from the source (S) to the relay (R), and (iii) two-way ET. We consider the problem of optimal power allocation in NC-EH-RC in order to maximize the total transmitted bits from S to the destination in a given time duration. General stochastic energy arrivals at S and R with known EH times and values are assumed. In NC-EH-RC with no ET, the complicated min-max optimization form along with its constraints make the problem intractable. It is shown that this problem can be transformed to a solvable convex form; however, convex optimization solution does not provide the structural properties of the optimal solution. Therefore, following an alternative perspective, we investigate conditions on harvesting process of S and R where we find optimal algorithmic solution. Further, we propose some suboptimal algorithms and provide some examples, in which the algorithms are optimal. Moreover, we find a class of problems for NC-EH-RC with one-way ET from S to R, where the optimal algorithmic solution is devised. For NC-EH-RC with two-way ET, we propose general optimal algorithmic solution. Furthermore, the performance of the proposed algorithms are evaluated numerically and compared with optimal numerical convex optimization tools. Copyright © 2014 John Wiley & Sons, Ltd. Copyright © 2014 John Wiley & Sons, Ltd
  6. Keywords:
  7. Full duplex ; Gaussian relay channel ; Power allocation ; Algorithms ; Electric relays ; Energy harvesting ; Energy transfer ; Gaussian distribution ; Stochastic systems ; Algorithmic solutions ; Decode - and - forwards ; Full-duplex ; Gaussian relays ; Optimal power allocation ; Optimization solution ; Power allocations ; Sub-optimal algorithms ; Convex optimization
  8. Source: International Journal of Communication Systems ; Volume 30, Issue 2 , 2017 ; 10745351 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/dac.2903