Wireless-powered cooperative multi-relay networks with relay selection

Li, Qiang; Feng, Shangjie; Pandharipande, Ashish; Ni, Qiang; Zhang, Jing

doi:10.1109/iccw.2017.7962629

Cited by 3 publications

(4 citation statements)

References 26 publications

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“…where τ (1) = γ p,0 σ 2 P p |h p,s (1)| 2 and γ p,0 = 2 R p − 1 is defined as the signal-to-noise ratio (SNR) threshold required for successfully decoding x p . With perfect CSI at the receiver side, which is a widely adopted assumption in existing works and can be achieved by using conventional training sequences [7], [47], [48], ST is able to dynamically determine a suitable power splitting factor λ(1) in advance. To be specific, if τ (1) ≤ 1, it means that x p can be successfully decoded right after the first transmission.…”

Section: A Proposed Retransmission Scheme With Energy Accumulation At Stmentioning

confidence: 99%

“…is transmitted by the ST with all energy harvested, as given in (7). The corresponding received signal at the PR and the SR at the end of the second phase is thus given as…”

Section: A Proposed Retransmission Scheme With Energy Accumulation At Stmentioning

confidence: 99%

“…To characterize the performance upper bound, we consider a conservative scenario where a received signal y s (t) at the ST can be either used for ID or EH, but cannot be split for ID and EH simultaneously. Then conditioned on the event E 1 that x p is successfully decoded by the ST at the tth time slot for t ∈ {1, • • • , N − 1}, only the subsequently received signals y s (t + 1), • • • , y s (N ) are used for EH at the ST. By contrast to (7), the corresponding energy available at the ST can be expressed as…”

Section: ) Upper Bound Analysismentioning

confidence: 99%

“…In order to extend IoT device lifetime in a sustainable manner, energy harvesting (EH) has been considered as a promising solution [4]. Given that harvested energy can vary depending on the ambient environment, supplemental technologies like wireless power transfer have been proposed in [5]- [7]. By using dedicated RF transmitters or wireless power beacons in addition to EH, relatively stable power supplies may be provided to IoT devices.…”

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confidence: 99%

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Cooperative Spectrum Sharing on SWIPT-Based DF Relay: An Energy-Aware Retransmission Approach

Zhang

Pandharipande

et al. 2019

IEEE Access

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In this paper, cooperative cognitive radio networks are considered, in which a primary user (PU) and an off-the-grid secondary user (SU) co-exist by exploiting simultaneous wireless information and power transfer. Based on a two-phase relaying model, adaptive power splitting is performed at the SU for information decoding while collecting the energy remaining in the first phase. The energy harvested is then used to forward the decoded primary signal, with the secondary signal superimposed in the second phase. To enhance the utilization of both the spectrum and energy, an energy-aware retransmission approach is proposed for enabling successful decoding at the SU while collecting a reasonable amount of energy for relaying. The outage probability and throughput are theoretically analyzed for both the PU and the SU. To provide more analytical insights, tight performance upper and lower bounds are obtained in closed forms. Our results demonstrate that a mutually beneficial relationship can be built between the PU and the SU under proper parameter configurations. Furthermore, a performance tradeoff with respect to the number of retransmissions is demonstrated, where additional performance gains can be achieved by the proposed retransmission approach under unfavorable conditions of high rate, low power, and weak channels.INDEX TERMS Cooperative cognitive radio networks, simultaneous wireless information and power transfer, adaptive power splitting, decode-and-forward, energy-aware retransmission.

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Section: A Proposed Retransmission Scheme With Energy Accumulation At Stmentioning

confidence: 99%

“…is transmitted by the ST with all energy harvested, as given in (7). The corresponding received signal at the PR and the SR at the end of the second phase is thus given as…”

Section: A Proposed Retransmission Scheme With Energy Accumulation At Stmentioning

confidence: 99%

Section: ) Upper Bound Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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