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In this paper, we present a new beacon recognition method for wireless sensor devices to access beacon-enabled WSN with low-power consumption. At first, we explain necessity of the low-power beacon recognition in the beacon-enabled wireless sensor networks. By realigning network resources, we catch that beacons are in the same position in each BI (beacon interval). Then, we propose how to switch operation...
This paper presents a regenerative sampling oscillator for the simultaneous regeneration of phase and amplitude, which enables highly efficient QAM schemes in the mm-wave range to reach multi-Gb/s data rates. A nonlinear model is derived to study the phase regeneration and the startup behavior of the oscillator and is simulated in CADENCE. A cross-coupled circuit is fabricated in a 0.13-μm SiGe BiCMOS...
Wireless measurement systems will provide significant benefits to industrial applications, for production facilities as well as in mobile or R&D scenarios. However, in order to exploit the improvements by flexibility, scalability and easy reconfigurability brought by wireless sensor networks (WSN), industrial use cases often require a sustainable autonomous energy supply, while providing the reliability...
A dual-band wireless neural stimulation device with high frequency (HF) wireless power transfer (WPT) at 13.56MHz and ultra high frequency (UHF) backscatter communication (BSC) at 915MHz is presented. Neural interfaces hold great promise in the development of future treatment/therapy for debilitating neurological disorders, spinal cord damage, and loss of limb function. Most state-of-the-art wireless...
There is a significant potential in saving energy of cellular networks by switching off some unloaded base stations (BSs). In this paper, we propose a BS switch-off strategy with distance constraints for reducing the energy consumption in random cellular networks. An ergodic capacity and coverage probability of the hard-core point processes (HCPP) random cellular networks are first analyzed. Furthermore,...
Networks-on-Chip (NoCs) have garnered significant interest as communication backbone for multicore processors used across a wide range of fields that demand higher computation capability. Wireless NoCs (WNoCs) by augmenting single hop, long range wireless links with wired interconnects; offer the most promising solution to reduce multi-hop long distance communication bottlenecks and opens up innumerable...
This paper presents an experimental study of a green wireless powered communication network (WPCN), where sensors with wireless power transfer (WPT) capabilities are located at known positions and an energy transmitter (ETx) is employed to wirelessly power the uplink between the sensors and the access point (AP). By monitoring and measuring the charging time that the sensors require to power their...
Recently, buttery-powered portable devices, which can use wireless LAN (WLAN), such as smart phones and tablet computers, are increasing. However, these devices consume more energy when using WLAN interfaces, and the battery lifetime is shorten. In order to reduce the power consumption of wireless stations, IEEE 802.11 specifies PSM (Power Saving Mode). However, PSM cannot save the energy optimally...
Dense heterogeneous networks are deployed for future wireless communication to meet the explosively increasing traffic demand. However, the network densification leads to a great amount of energy consumption especially the operation energy consumption. In this paper, we consider cooperative Base station (BS) operation in downlink dense heterogeneous networks consisting of one macro BS and several...
In energy efficient, present cooperative beam forming for wireless ad-hoc networks via cooperative beamforming, nodes in wireless network are able to transmit a common message over a long distance in an energy efficient manner. To improve the performance, have developed a cooperative beamforming algorithm. The idea of cooperative beamforming is to take the help of neighboring nodes to form a beam...
The power consumption of wireless access networks is becoming an important issue in the green cellular-technology. The concept of green 4G LTE system depends on enhanced design strategy of efficient LTE energy system in order to reduce greenhouse emission as well as operators energy bill. In this paper we have studied eNB sleep modes to identify the traffic awareness in LTE networks and subsequently...
A LED wireless dimming system based on the STM32 is designed in this paper. In the drive power, the single-ended flyback switching power supply topology and Boost is adopted as an LED constant current drive. A STM32 is used as the center controller. The exact timing of the timer is generated by using an adjustable PWM duty cycle which can control the intensity of the LED lights. Infrared remote control...
During recent years, Wireless Sensor Networks captured the imagination of many researchers with number of applications growing rapidly. Power consumption is (most often) the dominant constraint in designing such systems. This constraint has multi-dimensional implications such as battery type and size, energy harvester design, lifetime of the deployment, etc. Energy neutral system implementation is...
To enhance the utilization of base stations (BSs) and face the challenge of the upcoming mobile data tsunami, energy saving and traffic offloading are two important issues to address in green cellular networks. In this paper, we design an optimal green policy, called Genie, to strike a balance between energy saving and traffic offloading in the heterogeneous cellular network, so that the system can...
With the rapid growth in Internet network infrastructure, there is an urgent need to deploy energy-efficient networking technology. In particular, there is a need for energy-efficient wireless local area networks (WLANs), which are widely used due to their ease of deployment and low installation costs. To realize this, radio-on-demand (ROD) have been proposed. Access points (APs) in ROD are equipped...
The exponential increase in high rate traffic driven by a new generation of wireless devices is expected to overload cellular network capacity in the near future. Femtocells have recently been proposed as an efficient and cost-effective approach to enhance cellular network capacity and coverage. However, dense and unplanned deployment of additional Base Stations and their uncoordinated operation may...
This paper presents a flexible SAR ADC in 90nm CMOS for wireless sensor nodes. By supporting resolutions from 7 to 10bit and sample rates from DC to 2MS/s, this design can be used for a variety of applications such as sensor interfacing and receiver frontends. Flexibility is achieved by a reconfigurable comparator and a reconfigurable DAC. Compared to prior art, this work substantially improves power-efficiency...
In this paper, we present a novel hardware prototype implementation of a wireless communication system capable of automatically selecting one of several available commercial standards in order to minimize energy utilization while simultaneously achieving reasonable data rate performance. Without loss in generality, two wireless standards were employed in the prototype implementation, namely: ZigBee...
This paper presents the design and implementation of a wireless sensor communication system with a low power consumption for integration with energy harvesting technology, that can be employed in energy autonomous wireless sensor communication applications. The design and implementation focus on three levels: hardware, software and data transmission. The resulted system is able to satisfy all the...
The solid supply with electrical power in Europe needs the development of smart grids [1], [2]. To solve the control problems of these grids, smart metering devices and energy information systems (SCADA) are needed on the carrier level [3]. Considering private households and small enterprises, it is therefore required to replace plain old energy meters by modern smart metering components. Smart meters...
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