Relaying Protocols for Wireless Energy Harvesting and Information Processing

This paper considers amplify-and-forward (AF) two-way relay networks, where an energy constrained relay node harvests energy from the received radio-frequency signal. Based on time switching (TS) receiver, we separate the energy harvesting (EH) phase and the information processing (IP) phase in time. In the EH phase, three practical wireless power transfer policies are proposed: 1) dual-source (DS) power transfer, where both sources transfer power to the relay; 2) single-fixed-source (SFS) power transfer, where a fixed source transfers power to the relay; and 3) single-best-source (SBS) power transfer, where a source with strongest channel transfers power to the relay. In the IP phase, a new comparative framework of the proposed wireless power transfer policies is presented in two bi-directional relaying protocols, known as multiple access broadcast (MABC) and time division broadcast (TDBC).To characterize the performance of the proposed policies, new analytical expressions are derived for the outage probability, the throughput, and the system energy efficiency. Numerical results corroborate our analysis and show: 1) the DS policy performs the best in terms of both outage probability and throughput among the proposed policies, 2) the TDBC protocol achieves lower outage probability than the MABC protocol, and 3) there exits an optimal value of energy harvesting time fraction to maximize the throughput. A pivotal conclusion is reached that the SBS policy offers an optimal tradeoff between performance and power consumption since SBS consumes the least power but offers a comparable performance to that of DS. Index TermsMultiple access broadcast, time division broadcast, two-way relay networks, wireless power transfer.

show abstract

“…Substituting (11) into (4), we obtain a tight high SNR approximation for the end-to-end SNR at S i as [10,18] …”

Section: ) End-to-end Snrmentioning

confidence: 99%

Two‐way relay networks with wireless power transfer: design and performance analysis

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Also, the relay is assumed to have no other energy supply but only the energy harvested from the source [15]. For separating between information transferring and energy harvesting processes at relay node, we adopt the time-switching relaying protocol (TSR) [6]. Here, the total symbol duration T is divided into two intervals with the lengths of T α and (1 )T α − , respectively.…”

Section: System Modelmentioning

confidence: 99%

“…Let 2 1 R z = − be the lower threshold for SINR. Here, the average throughput can be computed as [6] ( ) (1 ) (1 )…”

Section: Outage Probability and System Throughputmentioning

confidence: 99%

“…The throughput performance of amplify-and-forward (AF) and decode-and-forward (DF) relaying systems for both time-switching (TSR) and power-splitting (PSR) protocols was studied rigorously in [6] and [7]. In these papers, Nasir et al have provided 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 either AF or DF relay nodes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Time Switching for Wireless Communications with Full-Duplex Relaying in Imperfect CSI Condition

2016

KSII TIIS

View full text Add to dashboard Cite

In this paper, we consider an amplify-and-forward (AF) full-duplex relay network (FDRN) using simultaneous wireless information and power transfer, where a battery-free relay node harvests energy from the received radio frequency (RF) signals from a source node and uses the harvested energy to forward the source information to destination node. The time-switching relaying (TSR) protocol is studied, with the assumption that the channel state information (CSI) at the relay node is imperfect. We deliver a rigorous analysis of the outage probability of the proposed system. Based on the outage probability expressions, the optimal time switching factor are obtained via the numerical search method. The simulation and numerical results provide practical insights into the effect of various system parameters, such as the time switching factor, the noise power, the energy harvesting efficiency, and the channel estimation error on the performance of this network. It is also observed that for the imperfect CSI case, the proposed scheme still can provide acceptable outage performance given that the channel estimation error is bounded in a permissible interval.

show abstract

“…However, it is difficult for a receiver, in practice, to simultaneously decode the information and harvest energy from the received RF signals. Thus, two practical policies are proposed to harvest energy and decode information separately [9]- [11]. One is the time switching policy, where the time is switched between the energy harvesting and information decoding; while the second policy is based on the power splitting, where a part of the received power is used to harvest energy and the rest for information decoding.…”

Section: Introductionmentioning

confidence: 99%

Interference-Assisted Wireless Energy Harvesting in Cognitive Relay Network with Multiple Primary Transceivers

Kalamkar

Banerjee

2015

2015 IEEE Global Communications Conference (GLOBECOM)

View full text Add to dashboard Cite

Abstract-We consider a spectrum sharing scenario, where a secondary network coexists with a primary network of multiple transceivers. The secondary network consists of an energyconstrained decode-and-forward secondary relay which assists the communication between a secondary transmitter and a destination in the presence of the interference from multiple primary transmitters. The secondary relay harvests energy from the received radiofrequency signals, which include the information signal from the secondary transmitter and the primary interference. The harvested energy is then used to decode the secondary information and forward it to the secondary destination. At the relay, we adopt a time switching policy due to its simplicity that switches between the energy harvesting and information decoding over time. Specifically, we derive a closed-form expression for the secondary outage probability under the primary outage constraint and the peak power constraint at both secondary transmitter and relay. In addition, we investigate the effect of the number of primary transceivers on the optimal energy harvesting duration that minimizes the secondary outage probability. By utilizing the primary interference as a useful energy source in the energy harvesting phase, the secondary network achieves a better outage performance.

show abstract

Relaying Protocols for Wireless Energy Harvesting and Information Processing

Cited by 1,779 publications

References 17 publications

Two‐way relay networks with wireless power transfer: design and performance analysis

Two‐way relay networks with wireless power transfer: design and performance analysis

Time Switching for Wireless Communications with Full-Duplex Relaying in Imperfect CSI Condition

Interference-Assisted Wireless Energy Harvesting in Cognitive Relay Network with Multiple Primary Transceivers

Contact Info

Product

Resources

About