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This paper presents a hybrid-powered wireless sensor node using enhanced triboelectric nanogenerator (TENG) as both energy harvester and air-flow sensor and two 11 cm2 solar panels as extra power supply. A low budget commercial RF microcontroller is included for data conversion, signal processing and wireless transmission. The method of flow-rate detection depends on the vibration frequency of the...
We have reported a prototype of wireless sensor node with ultra-low power consumption which has promising application on the temperature monitoring in central air conditioning system. Air-flow driven nanogenerators are utilized to harvest electric energy directly from the wind tunnel in a building. Using a microcontroller unit with event-driven strategy, the wireless sensor nodes can send out a temperature...
Train ground communication systems for different applications are deployed and managed independently in current urban rail transit systems with Wireless Local Area Network (WLAN) technology. Investing and constructing communication infrastructures repeatedly not only waste substantial social resources but also bring many difficulties to maintain all these infrastructures. In this paper, we design...
This paper considers applying simultaneous wireless information and power transfer (SWIPT) technique to cooperative clustered wireless sensor networks, where energy-constrained relay nodes harvest the ambient radio-frequency (RF) signal and use the harvested energy to forward the packets from sources to destinations. To this end, we first formulate the energy-efficient cooperative transmission (eCotrans)...
In this paper, a novel compact high isolation Wireless local area network (WLAN) multiple-input-multiple-output (MIMO) antenna based on composite right-/left-handed (CRLH) is proposed. The antenna performance and field distribution are studied through simulation. The results prove that this new method can realize high isolation between antenna elements with nearly no influence on its radiation performance...
Simultaneously transport multi-band ultra-wideband (MB-UWB) wireless signal and multi-level wired signal over single wavelength in wavelength-division multiplexing passive optical network (WDM-PON) is proposed, which can greatly improve spectrum efficiency and transmission ability of optical infrastructure.
In this paper, an X-band negative resistance oscillator based on the active substrate integrated waveguide (ASIW) is proposed. The ASIW is connected to the series feedback circuit to compensate the electromagnetic energy consumed by the resonator. This method is an effective way to improve the quality factor of the resonator and to suppress the phase noise of the oscillator. The proposed oscillator...
In this paper, we put forward a coupled electromechanical model with differential equation arrays for an electret-based energy harvester with out-of-the plane gap closing scheme. The model is numerically solved for output voltage and displacement of the moveable electrode with given parameters by Matlab/Simulink software. Furthermore, system optimization is carried out using the coupled model to find...
In this paper, we propose a novel ultra-wideband planar inverse-F antenna (PIFA) using periodic metal patches ground plane. By applying the capacitive compensation for the input impedance of the PIFA in higher frequencies, the proposed PIFA has a working frequency band from 2.3 GHz to 9.0 GHz. The effect of geometric parameters of the periodic metal patches and antenna height on antenna performance...
This paper studies the resource allocation problem for spectrum-sharing femtocell networks. An auction-based algorithm, VCG auction, is proposed to ensure femtocell users submit their utilities truthfully despite the selfish nature of them, so that the resource allocation scheme works efficiently and fairly. We investigate the uplink transmission in a sparsely deployed scenario of Femto-network. By...
Electricity-stealing defense is one of the chief steps in distribution network reconstruction. The electronic energy meter is an important invention for measurement energy power system, which is an effective measures for the electricity-stealing defense. And one-time seal technology makes stealing ways reduced to the limited several specific ways that are undercurrent tecnology, undervoltage teconology...
Localization is always a critical technology of wireless network. This paper introduces the theory of RSS-base localization, sets up a new localization algorithm and analyzes excellence of this algorithm. This paper compares it with other algorithms and compares their localization accuracy and directional judgement accuracy by indoor experiments. The result indicates that analysis of the noises and...
This paper describes how to carry out functions of RFID device, how to enhance RFID technology, and how to use Wi-Fi technology to follow real-time tracks so as to definite location. Also, this paper lists some produce newly developed using 802.11 technology. And after being inspired from this technology, we propose some ideas, which would be helpful to RFID technology in future.
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