In this letter, we propose a practical non-linear energy harvesting model and design resource allocation algorithm for simultaneous wireless information power transfer (SWIPT) systems. The is formulated as non-convex optimization problem the maximization of total harvested at receivers subject to minimum required signal-to-interference-plus-noise ratios (SINRs) multiple receivers. We transform considered objective function from sum-of-ratios form into an equivalent in subtractive form, which...

In this paper, we consider a multiple-input multiple-output wireless powered communication network, where multiple users harvest energy from dedicated power station in order to be able transmit their information signals an receiving station. Employing practical non-linear harvesting (EH) model, propose joint time allocation and control scheme, which takes into account the uncertainty regarding channel state (CSI) provides robustness against imperfect CSI knowledge. particular, formulate two...

In this paper, we consider a simple network consisting of source, half-duplex decode-and-forward relay, and destination. We propose new relaying protocol employing adaptive link selection, i.e., in any given time slot, based on the channel state information source-relay relay-destination decision is made whether source or relay transmits. order to avoid data loss at selection requires be equipped with buffer such that can queued until selected for transmission. study both delay-constrained...

Cooperative communication can increase the throughput and/or extend coverage of wireless networks. However, in conventional cooperative networks, half-duplex relays transmit and receive under a prefixed schedule, which does not allow them to exploit best receiving transmitting channels, thus limiting performance. Recently, new protocols have been proposed that circumvent this problem by making use additional flexibility offered with buffers. Compared relaying protocols, these buffer-aided...

We consider a simple network consisting of source, half-duplex DF relay with buffer, and destination. assume that the direct source-destination link is not available all links undergo fading. propose two new buffer-aided relaying schemes. In first scheme, neither source nor have CSIT, consequently, both nodes are forced to transmit fixed rates. contrast, in second does CSIT transmits rate but has adapts its transmission accordingly. absence delay constraints, for mixed transmission, we...

In this letter, we propose a non-orthogonal multiple access (NOMA) scheme for the uplink of wireless powered communication networks (WPCNs). order to tackle doubly near-far effect in WPCNs, decoding compound information signal received at base station (BS) is set be an inverse distances between energy harvesting users (EHU) and BS. For proposed scheme, derive jointly optimal allocations BS transmit power durations transmission phases, such that rate region maximized. Compared NOMA schemes...

In this paper, we consider a simple network consisting of source, half-duplex decode-and- forward relay, and destination. contrast to most the existing literature, assume that relay is equipped with buffer show can lead substantial performance gains. We propose protocol which chooses either source-relay or relay-destination link for transmission depending on instantaneous channel state information. For protocol, derive throughput adaptive rate outage probability fixed transmission. Our...

This is the second part of a two-part paper considering bidirectional relay networks with half-duplex nodes and block fading where transmit fixed transmission rate. In Part I, it was shown that considerable gain in terms sum throughput can be obtained by optimally selecting modes or, equivalently, states nodes, i.e., transmit, receive, silent states, based on qualities involved links. To enable adaptive mode selection, has to equipped two buffers for storage data received from users. The...

For a general energy harvesting (EH) communication network, i.e., network where the nodes generate their transmit power through EH, we derive asymptotically optimal online allocation solution that optimizes utility function when number of time slots, N, and battery capacities EH nodes, B <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> , satisfy N → ∞ ∞. The considered family functions is enough to include most important performance...

In this paper, we investigate the two-hop full-duplex (FD) relay channel with self-interference and fading, which is comprised of a source, an FD relay, destination, where direct source-destination link does not exist impaired by self-interference. For channel, propose three buffer-aided relaying schemes adaptive reception-transmission at for cases when source both perform adaptive-power allocation, fixed-power fixed-rate transmission, respectively. The proposed significantly improve...

In this paper, we investigate the capacity of Gaussian two-hop full-duplex (FD) relay channel with residual self-interference. This is comprised a source, an FD relay, and destination, where direct source-destination link does not exist impaired by We adopt worst case linear self-interference model respect to capacity, as random variable whose variance depends on amplitude transmit symbol relay. For channel, derive propose explicit capacity-achieving coding scheme. Thereby, show that optimal...

Majority voting is a simple mathematical function that returns the most frequently occurring value within given set. As popular decision fusion technique (DFT), majority (MVF) finds applications in resolving conflicts, where several independent voters report their opinions on classification problem. Despite its importance and various ensemble learning, data crowdsourcing, remote sensing, oracles for blockchains, accuracy of MVF general multiclass problem has remained unknown. In this...

Second order statistics provides a dynamic representation of fading channel and plays an important role in the evaluation design wireless communication systems. In this paper, we present novel analytical framework for second statistical parameters, as level crossing rate (LCR) average fade duration (AFD) amplify-and-forward multihop Rayleigh channel. More specifically, motivated by fact that is cascaded one can be modeled product N amplitudes, derive expressions LCR AFD envelopes (or...

We present novel exact expressions and accurate closed-form approximations for the level crossing rate (LCR) average fade duration (AFD) of double Nakagami-m random process. These results are used to study second order statistics multiple input output (MIMO) keyhole fading channels with space-time block coding. Numerical computer simulation examples validate accuracy presented mathematical analysis show tightness proposed approximations.

We optimize resource allocation to enable com- munication security in simultaneous wireless information and power transfer (SWIPT) for internet-of-things (IoT) networks. The algorithm design is formulated as a non-convex optimization problem. aim at maximizing the total harvested energy harvesting (EH) receivers via joint of transmit beamforming vectors covariance matrix artificial noise injected facilitate secrecy provisioning. proposed problem formulation takes into account non-linearity...

In the half-duplex single relay selection network, comprised of a source, M relays, and destination, only one is active at any given time, i.e., receives or transmits, other relays are inactive, they do not receive nor transmit. The capacity this when all links affected by independent slow time-continuous fading additive white Gaussian noise (AWGN) , still unknown, achievable average rates have been reported in literature so far. paper, we present new for which larger than best known rates....

The bidirectional relay channel, in which two users communicate with each other through a node, is simple but fundamental and practical network architecture. In this paper, we consider the block fading channel propose efficient transmission strategies that exploit property of channel. Thereby, decode-and-forward assume direct link between not present. Our aim to characterize long-term achievable rate region develop protocols achieve all points obtained region. Specifically, there exist six...

We consider a three-node decode-and-forward (DF) half-duplex relaying system, where the source first harvests RF energy from relay, and then uses this to transmit information destination via relay. assume that transfer wireless power phases alternate over time in same frequency band, their {\it fraction} (TF) may change or be fixed one transmission epoch (fading state) next. For we maximize achievable average data rate. Thereby, propose two schemes: (1) jointly optimal TF allocation, (2)...

This paper investigates resource allocation for simultaneous wireless information and power transfer (SWIPT) downlink systems based on a non-linear energy harvesting model. The algorithm design is formulated as non-convex optimization problem the maximization of total harvested power. proposed formulation not only takes into account imperfect channel state (CSI) but also guarantees quality-of-service (QoS) transfer. A novel iterative to obtain globally optimal solution considered problem. In...

Holographic massive multiple-input multiple-output (MIMO), in which a spatially continuous surface is being used for signal transmission and reception, has emerged as promising solution improving the coverage data rate of wireless communication systems. To realize these objectives, acquisition accurate channel state information holographic MIMO systems crucial. This paper proposes estimation scheme based on parametric physical model line-of-sight (LoS) dominated millimeter terahertz wave...

In this paper, we consider bidirectional relay networks in which two users exchange information only via a node, i.e., direct link between both is not present. We assume that channel state at the transmitter available and/or one coding and modulation scheme used due to complexity constraints. Thus, nodes transmit with fixed predefined rate regardless of state. general, network can three possible states each time slot, namely, transmit, receive, silent Most existing relaying protocols...

The half-duplex (HD) multi-hop relay channel consists of a source, multiple HD relays connected in series, and destination where links are present only between adjacent nodes. In this paper, we focus on decode-and-forward assume that the impaired by block fading additive white Gaussian noise. We design new protocol which, unlike conventional protocols for channel, does not adhere to fixed predefined pattern using transmit, receive, silent states particular, proposed selects optimal nodes...

A simple diamond half-duplex relay network composed of a source, two decode-and-forward relays, and destination is considered, where direct link between the source does not exist. For this network, we study case buffer-aided relays are equipped with buffers. Each can receive data from store it in buffer, forward to destination, when channel conditions advantageous. Thereby, buffering enables adaptive scheduling transmissions receptions over time, which allows exploit diversity offered by...

In this paper, we investigate the resource allocation algorithm design for full-duplex simultaneous wireless information and power transfer (FD-SWIPT) systems. The considered system comprises a FD radio base station, multiple single-antenna half-duplex (HD) users, energy harvesters equipped with antennas. We propose multi-objective optimization framework to study trade-off between uplink transmit minimization, downlink total harvested maximization. takes into account heterogeneous quality of...