A Detection Scheme for Integrated SWIPT Receivers With Rectenna Arrays

Abstract

Smart devices and their applications led to a rapid evolution of the Internet of Things. As a result, there is an emerging need on energizing those low-power devices, while at the same time achieving information transfer. In this context, simultaneous wireless information and power transfer (SWIPT) is considered as an appealing technology, since it can power wirelessly and remotely such devices, simultaneously with information transfer. Motivated by this, we herein propose a system model with an integrated SWIPT receiver, succeeding enhanced performance in terms of information decoding (ID) and energy harvested (EH). Specifically, we adopt a single input multiple output topology, where at the receiver's side we examine two antenna architectures, one based on the direct-current (DC) combining and the other on the radio-frequency (RF) combining. For both schemes, we consider multiple receive antennas and rectifiers, comparing their performances. Furthermore, we adopt a piece-wise linear EH model, which takes into account the sensitivity and saturation effects of the rectifiers. By using a maximum likelihood-based soft decoding, a non-coherent energy detection is achieved. Finally, an asymptotic analysis is conducted, providing upper and lower bounds for ID and EH, respectively. Simulation results along with theoretical analysis, validate the enhanced performance both in terms of ID and EH.

Energy Harvesting From Jamming Attacks in Multi-User Massive MIMO Networks

“…3, the average achievable user data rate at the basestation in the finite antenna regime is plotted against the jamming power by considering different numbers of active jammers (N). The analytical uplink rate curves are plotted by using (22), and are compared to the Monte-Carlo simulations of the uplink rate expression in (14) while employing the non-linear harvesting model in (8). Obviously, the achievable rate gradually increases when the jammers transmit higher power levels because the more jamming power, the greater energy will be harvested by the user nodes until a saturation point.…”

“…Towards this end, smart antennas technologies such as massive MIMO that can enhance the performance of energy harvesting and then boost the overall energy efficiency and achievable data rate [7]. Specifically, the large antenna arrays in massive MIMO systems can be used for increasing the lifetime of energy constrained wireless networks where the transmitted RF energy can be focused towards the nodes that need to be charged wirelessly, leading to an energy efficient solution compared to a single-antenna transmitter [8]. Furthermore, massive MIMO resource allocation can be formulated as an optimization problem in which the degrees of freedom in the antenna arrays and time are optimized for enhancing of the energy harvesting performance [9].…”