Energy-recycling full-duplex radios for next-generation networks

Abstract

In this work, a novel energy-recycling single-antenna full-duplex (FD) radio is designed, in which a new 3-port element including a power divider and an energy harvester is added between the circulator and the receiver (RX) chain. The presence of this new element brings advantages over the state of the art in terms of both spectral efficiency and energy consumption. In particular, it provides the means of performing both an arbitrary attenuation of the incoming signal, which in turn increases the effectiveness of the state-of-the-art self-interference cancellation strategies subsequently adopted in the RX chain, and the recycling of a non-negligible portion of the energy leaked through the non-ideal circulator. The performance of this architecture is analyzed in a practically relevant 4-node scenario in which 2 nodes operate in FD and 2 nodes in half-duplex (HD). Analytical approximations are derived for both the achievable rates of the transmissions performed by the FD and HD radios and the energy recycled by the FD radios. The accuracy of these derivations is confirmed by numerical simulations. Quantitatively, achievable rate gains up to 40% over the state-of-the-art alternatives, in the considered scenario, are highlighted. Furthermore, up to 50% of the leaked energy at the circulator, i.e., 5% of the energy of the transmitted signal, can be recycled

Cache-aided full-duplex small cells

“…Proof: See Appendix II. 4 Without loss of generality, we consider the same SIR threshold for both UL and DL communications. Path-loss exponent II α2 4…”

Accumulate and Jam: Towards Secure Communication via A Wireless-Powered Full-Duplex Jammer

“…• N J RF chains for energy harvesting and jamming transmission, • N J rectifiers for rectifying the received RF signals into direct currents (DC) [22], • a primary energy storage (PES), i.e. a chemical rechargeable battery with high energy density, • a secondary energy storage (SES), i.e.…”

Is Self-Interference in Full-Duplex Communications a Foe or a Friend?

“…The system throughput is maximized in [5], whereas the signal-to-noise ratio (SNR) is maximized in [6]. In [7], the authors introduce a three-port circuit for recycling the SI and show significant improvement in the EE.…”

“…Very recently, FD has been combined with SWIPT to boost both the spectral efficency and energy efficiency (EE) of the system [3], [4]. Furthermore, the idea of self-energy (SEg) recycling from the SI is conceptualized in [5]- [7]. Both in [5] and [6], FD is used at the relay terminal and the time-splitting protocol is applied for the SEg harvesting.…”

“…The system throughput is maximized in [5], whereas the signal-to-noise ratio (SNR) is maximized in [6]. In [7], the authors introduce a three-port circuit for recycling the SI and show significant improvement in the EE.Since the SI carries high energy, it could potentially be harvested for some fraction of a total transmission time. Inspired from this idea, in this paper, we consider the SEg harvesting by the SI at a small cell base station (SBS).…”