Recent advances on wireless energy transfer (WET) make it a promising solution for powering future Internet-of-Things (IoT) devices enabled by the upcoming sixth-generation (6G) era. The main architectures, challenges and techniques efficient scalable are overviewed in this article. Candidates enablers, such as beamforming (EB), distributed antenna systems (DASs), devices' hardware programmable medium, new spectrum opportunities, resource scheduling, ledger technology outlined. Special...

This paper proposes two solutions based on angle diversity receivers (ADRs) to mitigate inter-cell interference (ICI) in underground mining visible light communication (VLC) systems, one of them is a novel approach. A realistic VLC system scenarios, termed as roadway and mine working face, developed modeled. channel model the direct component line-of-sight (LoS) reflections non-line-of-sight (NLoS) links considered, well thermal shot noises. The design mathematical models pyramid...

Wireless energy transfer (WET) is emerging as a potential solution for powering small energy-efficient devices. We propose strategies that use multiple antennas at power station, which wirelessly charges large set of single-antenna The proposed operate without channel state information (CSI), and we attain the distribution main statistics harvested under Rician fading channels with sensitivity saturation energy-harvesting (EH) impairments. A switching antenna strategy, where single full...

Low Power Wide Area Networks (LPWAN) are wireless connectivity solutions for Internet-of-Things (IoT) applications, including industrial automation. Among the several LPWAN technologies, LoRaWAN has been extensively addressed by research community and industry. However, reliability scalability of still uncertain. One techniques to increase is message replication, which exploits time diversity. This paper proposes a novel hybrid coded replication scheme that interleaves simple repetition...

The exponential growth of Internet Things (IoT) applications led to the deployment IoT devices in remote areas beyond reach terrestrial networks, calling for satellite network solutions. Indeed, Low-Earth Orbit (LEO) satellites can provide global connectivity direct-to-satellite (DtS)-IoT applications, with remarkable impact several areas, as environmental monitoring, precision agriculture, and disaster prevention. One key challenges DtS-IoT is supporting energy spectral efficient multiple...

Reducing energy consumption is a pressing issue in low-power machine-type communication (MTC) networks. In this regard, the Wake-up Signal (WuS) technology, which aims to minimize consumed by radio interface of devices (MTDs), stands as promising solution. However, state-of-the-art WuS mechanisms use static operational parameters, so they cannot efficiently adapt system dynamics. To overcome this, we design simple but efficient neural network predict MTC traffic patterns and configure...

Location awareness allows to define a concurrent transmission region where primary and secondary networks can coexist. We investigate the impact of joint rate power control on performance cognitive radio ad hoc network overlaying system. The proposed strategies adequately adjust user transmit increase probability while respecting given constraint achievable rate. Two are described: Rate-Efficient Power Control maximize capacity, Energy-Efficient minimize energy consumption. Numerical results...

This study examines the dynamics of limnological parameters a South American lake located in southern Chile with objective predicting chlorophyll-a levels, which are key indicator algal biomass and water quality, by integrating combined remote sensing machine learning techniques. Employing four advanced models, research focuses on estimation concentrations at three sampling stations within Lake Ranco. The data span from 1987 to 2020 used different cases: using only situ (Case 1),...

This paper investigates the outage behavior and power allocation problem in a two-user network-coded cooperative cognitive radio network over Rayleigh fading channels. First, we derive an exact expression for probability of secondary transmissions, then propose approximate whose validity limits are later evaluated. To improve efficiency network, two schemes proposed. In first scheme, transmit is adjusted as function average channel gains control formulated convex optimization where objective...

Radio-frequency wireless energy transfer (RF-WET) is emerging as a potential green enabler for massive Internet of Things (IoT). Herein, we analyze channel state information (CSI)free multiantenna strategies powering wirelessly large set single-antenna IoT devices. The CSI-free schemes are AASS (AA-IS), where all antennas transmit the same (independent) signal(s), and SA, just one antenna transmits at time such that utilized during coherence block. We characterize distribution provided under...

This paper considers the use of successive interference cancellation (SIC) to decode superposed signals in Long Range (LoRa) networks. We build over a known stochastic geometry model for LoRa networks and include effect recovering colliding packets through SIC. derive closed-form expressions successful decoding using SIC taking path loss, fading, noise, into account, while we validate by means Monte Carlo simulations. Results show that SIC-enabled improve worst-case reliability up 34%. that,...

Prolonging the lifetime of massive machine-type communication (MTC) networks is key to realizing a sustainable digitized society. Great energy savings can be achieved by accurately predicting MTC traffic followed properly designed resource allocation mechanisms. However, selecting proper predictor not straightforward and depends on accuracy/complexity trade-offs specific applications network characteristics. Remarkably, related state-of-the-art literature still lacks such debates. Herein, we...

Wireless energy transfer (WET) is emerging as an enabling green technology for Internet-of-Things (IoT) networks. WET allows the IoT devices to wirelessly recharge their batteries with from external sources such dedicated radio-frequency transmitters called power beacons (PBs). In this article, we investigate optimal deployment of PBs that guarantees a network-wide outage constraint. Optimal positions are determined by maximizing average incident worst location in service area since no...

In this paper, the application and benefits of several combining schemes to create diversity at optical receiver are analyzed compared in a multi-cell indoor Visible Light Communication (VLC) system. The implementation pyramidal Angle Diversity Receiver (ADR) mitigate Intercell Interference (ICI) system is also analyzed. Thus, three side investigated: Select Best Combining (SBC), Equal Gain (EGC), Maximum Ratio (MRC), which conjunction with presented ADR, configure an that optimizes...

Radio-frequency (RF) wireless energy transfer (WET) is a key technology that may allow seamlessly powering future massive low-energy Internet of Things (IoT) networks. To enable efficient WET, channel state information (CSI)-limited/free multiantenna transmit schemes have been recently proposed in the literature. The idea to reduce/null costs be paid by harvesting (EH) IoT nodes from participating large-scale time/power-consuming CSI training, but still some spatial gains. In this article,...

Machine-type communications (MTC) should account for half the connections to internet by 2030. The use case massive MTC (mMTC) allows applications connect a number of low-power and low-complexity devices, leading challenges in resource allocation. Not only that, mMTC networks suffer under rigid random access schemes due ultra-dense nature resulting poor performance. In this sense, paper proposes <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Wireless energy transfer (WET) technology is key for future wireless networks as it can enable uninterrupted and maintenance-free operation of Internet Things (IoT) networks, which will be composed billions sensors. Although, perfect channel state information (PCSI) appealing beamforming design at the power beacon (PB). Such knowledge unavailable in most practical WET systems mostly theoretical interest. In this paper, we propose a novel approach to minimize total recharging time devices...