TY - JOUR
T1 - Feedback Enhances Simultaneous Wireless Information and Energy Transmission in Multiple Access Channels
AU - Amor, Selma Belhadj
AU - Perlaza, Samir M.
AU - Krikidis, Ioannis
AU - Poor, H. Vincent
N1 - Funding Information:
Manuscript received November 15, 2015; revised August 21, 2016 and February 27, 2017; accepted March 3, 2017. Date of publication March 15, 2017; date of current version July 12, 2017. This research is supported in part by the European Commission under the Marie Skłodowska-Curie Individual Fellowship under Grant 659316, and in part by the U.S. National Science Foundation under Grant CNS-1456793 and Grant ECCS-1343210. This paper was presented in part at the Fifth International Conference on Communications and Networking [1], and in part at the 2016 IEEE International Symposium on Information Theory [2].
Publisher Copyright:
© 1963-2012 IEEE.
PY - 2017/8
Y1 - 2017/8
N2 - In this paper, the fundamental limits of simultaneous information and energy transmission in the two-user Gaussian multiple access channel with feedback (G-MAC-F) and without feedback (G-MAC) are fully characterized. More specifically, all the achievable information and energy transmission rates (in bits per channel use and energy-units per channel use, respectively) are identified. Furthermore, the fundamental limits on the individual and sum-rates given a minimum-energy rate ensured at an energy harvester are also characterized. In the case without feedback, an achievability scheme based on power-splitting and successive interference cancellation is shown to be optimal. Alternatively, in the G-MAC-F case, a simple yet optimal achievability scheme based on power-splitting and Ozarow's capacity achieving scheme is presented. Finally, the energy transmission enhancement induced by the use of feedback is quantified. Feedback can at most double the energy transmission rate at high SNRs when the information transmission sum-rate is kept fixed at the sum-capacity of the G-MAC, but it has no effect at very low SNRs.
AB - In this paper, the fundamental limits of simultaneous information and energy transmission in the two-user Gaussian multiple access channel with feedback (G-MAC-F) and without feedback (G-MAC) are fully characterized. More specifically, all the achievable information and energy transmission rates (in bits per channel use and energy-units per channel use, respectively) are identified. Furthermore, the fundamental limits on the individual and sum-rates given a minimum-energy rate ensured at an energy harvester are also characterized. In the case without feedback, an achievability scheme based on power-splitting and successive interference cancellation is shown to be optimal. Alternatively, in the G-MAC-F case, a simple yet optimal achievability scheme based on power-splitting and Ozarow's capacity achieving scheme is presented. Finally, the energy transmission enhancement induced by the use of feedback is quantified. Feedback can at most double the energy transmission rate at high SNRs when the information transmission sum-rate is kept fixed at the sum-capacity of the G-MAC, but it has no effect at very low SNRs.
KW - Feedback
KW - Gaussian multiple access channel
KW - RF harvesting
KW - information-energy capacity region
KW - simultaneous information and energy transmission
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U2 - 10.1109/TIT.2017.2682166
DO - 10.1109/TIT.2017.2682166
M3 - Article
AN - SCOPUS:85028966150
SN - 0018-9448
VL - 63
SP - 5244
EP - 5265
JO - IEEE Transactions on Information Theory
JF - IEEE Transactions on Information Theory
IS - 8
M1 - 7879357
ER -