Open AccessEnergy-Efficient Power Allocation in Energy Harvesting Two-Way AF Relay Systems
Author(s) -
Chensi Zhang,
Haoyu Du,
Jianhua Ge
Publication year - 2017
Publication title -
ieee access
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 127
ISSN - 2169-3536
DOI - 10.1109/access.2017.2670641
Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation
In this paper, we focus on the issue of energy efficiency (EE) optimization of amplify-and-forward-based energy harvesting two-way relaying systems. Utilizing the statistical channel state information, we first build a statistical EE model, which is applicable to practical environments under fast fading channels. Then, a power allocation problem is formulated to maximize the EE under the constraints of total power and sum rate. Particularly, we have taken the asymmetric traffic requirements into account in our design, considering that the two sources may have different data rates. With the help of nonlinear fractional programming and Karush-Kuhn-Tuchker conditions, closed-form solution is achieved, thus providing valuable guidelines into practical system designs. For wider applications, we have shown that our results can be extended to multi-relay multi-user scenarios. Simulation results highlight the effect of our analytical results.
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