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Respiration rate plays an important role in human health monitoring. Traditional respiration rate monitoring techniques usually require users to wear some special equipment, which is not convenient for the elderly and the baby. Recently, Wi-Fi based respiration detection technique has attracted much attention due to its device-free and low-deployment-cost. However, most existing studies focus on respiration...
Most of IoT applications include large number of distributed sensors which are interesting in specific geographical area. A large number of IoT entities have multiple relations and dynamic connections with each other. And there are many group communication requirements. Flexible multicast mechanism will be essential in such environments but it is difficult to satisfy verious requirements by means...
Energy efficient cognitive radio networks can simultaneously improve spectrum efficiency (SE) and energy efficiency (EE) of wireless communication networks. This paper studies energy efficient spectrum sensing interval, spectrum sensing energy and transmit power allocation scheme of the secondary user (SU) in CR networks. The EE maximization problem subject to the transmit power constraint and average...
In this paper we consider the broadband-narrowband coexistence scenario where the unused spectral gaps in the professional mobile radio (PMR) frequency band are used for broadband data communications. Spectrally confined filter bank based multicarrier (FBMC) waveform is applied for broadband transmission in order to minimize the interference leakage between the new broadband system and the legacy...
Considering a small-scale fading environment in a dense random wireless network, we investigate the impact of the carrier-sensing threshold on the link performance under the premise of a fixed carrier-sensing range. At first, we assume a close transmitter-receiver distance and model the network nodes as a homogeneous Poisson point process (PPP). Then we present a simple analysis model of the conditional...
As a step toward sustainable wireless sensing, we present a proof of concept system that uses a Plant Microbial Fuel Cells (PMFC) as a power source. To match the very low power production capabilities of the PMFC, we couple it with an ultra-low power wake-up receiver used as a trigger for sampling and transmission of the sensed value. We demonstrate that this combination, with a new, receiver initiated...
This paper presents a tightly-coupled INS/GNSS integration for personal navigation systems using foot-mounted sensors. Our precise relative positioning INS based on high accurate Zero-Velocity-Updates (ZUPTs) is fused with GNSS pseudo-range and doppler measurements for absolute position and heading estimation. Unique is the decision depending on the classified motion state if doppler measurements...
This paper presents a solution to the problem of tracking multiple targets from multistatic Doppler measurements. To the best of our knowledge our solution is the first principled multitarget tracker for multistatic Doppler radar. The tracker is based on a closed form solution to the labeled multitarget Bayes filter, which can be implemented with linear complexity in the number of measurements. Numerical...
In this paper, we investigate the impact of the carrier-sensing range on the link performance in a dense wireless network. Considering small-scale fading effects, we fix the carrier-sensing threshold and adaptively adjust the carrier-sensing range. At first, we assume a close transmitter-receiver distance and model the network nodes as a homogeneous Poisson point process (PPP). Then we obtain the...
Radio-on-demand wireless sensor networks (WSN) are expected to be expanded the lifetime of sensor nodes because the receiver effectively utilizes the sleep/wake-up control function. The multi-carrier code division multiple access (MC-CDMA) using modified pseudo orthogonal M-sequence sets (MPOMS) codes have been proposed for radio-on-demand WSN systems. In this paper, the rigorous communication success...
Wireless Power Transfer (WPT) technologies aim at getting rid of cables used by consumer devices for energy provision. As long distance WPT is becoming mature, the health impact of WPT becomes increasingly important to consider. In this paper we look at how to maximize the wireless power transfer to remote devices, while maintaining a safe level of electromagnetic radiation (EMR) for humans that are...
With the constant advances in wireless technology, radio spectrum has become a very scarce resource. Cognitive Radio (CR) has emerged as a viable way to deal with our inefficient use of the radio spectrum by utilizing unused spectrum holes or white spaces, as they are referred to. Using Software Defined Radio (SDR) we are able to realize CRs and their unique properties. Most of the research that has...
This paper presents a digital communication system based on Orthogonal Frequency Division Multiplexing (OFDM) and MHz-range ultrasound, for transmission of data through solid materials and liquids. The system is tested on experiments using a off-the-shelf ultrasound transducers with a center frequency of 3.5 MHz as transmitter and receiver, respectively. The propagation medium in the experiment was...
Internet of Things (loT) aims at collecting data from billions of devices connected altogether. Despite there is no one technology able to cope with all possible scenarios, LPWAN solutions are emerging as viable technologies for implementing private, low-cost cellular like wireless networks. Distributed systems could leverage this approach as a driving technology for services as smart environment...
Reflection radio principles, used in RFID systems, have been recently exploited in wireless sensor networking, due to their inherent low-power requirements. This work offers a complete batteryless analog sensor design, implemented and tested in real-world conditions, able to backscatter its sensed information, without any type of analog-to-digital converter (ADC), digital logic or dedicated illuminator,...
In this paper, we propose a distributed spectrum sensing technique for a finite source of Secondary Users (SUs) in the presence of M Primary Users (PUs) where individual SUs perform spectrum sensing using an Enhanced Blindly Combined Energy Detection (EBCED) technique according to the geometric distribution. We apply graph theory in order to facilitate signal detection using statistical learning and...
In this study, changes in the pulse direction and flight path of bats during an obstacle-avoiding flight were experimentally investigated. While flying in unfamiliar space, bats often produced pairs of emissions (double pulses) and shifted the pulse direction between immediate obstacles and their intended flight direction. To confirm the practical effectiveness of the bats' behaviour, the observed...
Automation Technologies are on a rise today as their use has reduced the efforts of humans manifold. The concept of automation has its roots today from industrial to consumer grade applications. Smart Home Automation is one such concept evolved from a broader category of Building Automation. The advancement of many wireless technologies today like Bluetooth, Wi-Fi, RF, Zigbee, WiMAX, Zwave, etc paved...
Most underwater deployments rely on acoustics for enabling communication. The equipment for underwater communication is usually very expensive. Simulations of underwater systems are insufficient for many researchers. An open source platform built with commercially available hardware at low rates along with customizable software modules may prove to be very useful for researcher. This paper particularly...
A circuit for simultaneous optical data reception and energy harvesting using a photovoltaic cell is presented. This circuit is based on a DC-Dc boost converter modified to also work as an optical communications receiver. The circuit is able to boost the low voltage of a typical silicon photovoltaic cell to a level that can be used to drive an electronic circuit. The data receiver portion of the circuit...
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