216 research outputs found
Relaying protocols for wireless energy harvesting and information processing
An emerging solution for prolonging the lifetime of energy constrained relay nodes in wireless networks is to avail the ambient radio-frequency (RF) signal and to simultaneously harvest energy and process information. In this paper, an amplify-and-forward (AF) relaying network is considered, where an energy constrained relay node harvests energy from the received RF signal and uses that harvested energy to forward the source information to the destination. Based on the time switching and power splitting receiver architectures, two relaying protocols, namely, i) time switching-based relaying (TSR) protocol and ii) power splitting-based relaying (PSR) protocol are proposed to enable energy harvesting and information processing at the relay. In order to determine the throughput, analytical expressions for the outage probability and the ergodic capacity are derived for delay-limited and delay-tolerant transmission modes, respectively. The numerical analysis provides practical insights into the effect of various system parameters, such as energy harvesting time, power splitting ratio, source transmission rate, source to relay distance, noise power, and energy harvesting efficiency, on the performance of wireless energy harvesting and information processing using AF relay nodes. In particular, the TSR protocol outperforms the PSR protocol in terms of throughput at relatively low signal-to-noise-ratios and high transmission rates.ARC Discovery Projects Grant DP11010254
Hybrid protocol for wireless EH network over weibull fading channel: performance analysis
In this paper, the hybrid TSR-PSR protocol for wireless energy harvesting (EH) relaying network over the Weibull fading channel is investigated. The system network is working in half-duplex (HD) mode. For evaluating the system performance, the closed-form and integral-form expressions of the outage probability (OP) are investigated and derived. After that, numerical results convinced that our derived analytical results are the same with the simulation results by using Monte Carlo simulation. This paper provides a novel recommendation for the wireless EH relaying network
Distributed Beamforming with Wirelessly Powered Relay Nodes
This paper studies a system where a set of relay nodes harvest energy
from the signal received from a source to later utilize it when forwarding the
source's data to a destination node via distributed beamforming. To this end,
we derive (approximate) analytical expressions for the mean SNR at destination
node when relays employ: i) time-switching based energy harvesting policy, ii)
power-splitting based energy harvesting policy. The obtained results facilitate
the study of the interplay between the energy harvesting parameters and the
synchronization error, and their combined impact on mean SNR. Simulation
results indicate that i) the derived approximate expressions are very accurate
even for small (e.g., ), ii) time-switching policy by the relays
outperforms power-splitting policy by at least dB.Comment: 4 pages, 3 figures, accepted for presentation at IEEE VTC 2017 Spring
conferenc
Cooperative Energy Harvesting Networks with Spatially Random Users
This paper considers a cooperative network with multiple source-destination
pairs and one energy harvesting relay. The outage probability experienced by
users in this network is characterized by taking the spatial randomness of user
locations into consideration. In addition, the cooperation among users is
modeled as a canonical coalitional game and the grand coalition is shown to be
stable in the addressed scenario. Simulation results are provided to
demonstrate the accuracy of the developed analytical results
Rate Maximization of Decode-and-Forward Relaying Systems with RF Energy Harvesting
We consider a three-node decode-and-forward (DF) half-duplex relaying system,
where the source first harvests RF energy from the relay, and then uses this
energy to transmit information to the destination via the relay. We assume that
the information transfer and wireless power transfer phases alternate over time
in the same frequency band, and their {\it time fraction} (TF) may change or be
fixed from one transmission epoch (fading state) to the next. For this system,
we maximize the achievable average data rate. Thereby, we propose two schemes:
(1) jointly optimal power and TF allocation, and (2) optimal power allocation
with fixed TF. Due to the small amounts of harvested power at the source, the
two schemes achieve similar information rates, but yield significant
performance gains compared to a benchmark system with fixed power and fixed TF
allocation.Comment: 4 pages, 1 figur
- …