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In this paper, we offer a new type of vehicle detection method based on the strength of the signal transmission with adopting CC1101 wireless communication chip, and RSSI (Received Signal Strength Indication) value of the data receiving node is different when there is a car or no car on the parking space. Through a large number of nodes arranged on the parking space, the data receiving node sends...
In this paper, we present the design of the communication in a wireless sensor network. The resource limitations of a wireless sensor network, especially in terms of energy, require an integrated, and collaborative approach for the different layers of communication. In particular, energy-efficient solutions for medium access control, clusterbased routing, and multipath creation and exploitation are...
This paper proposes passive and semi-passive wireless temperature and humidity sensors based on electronic product code (EPC) global Class-1 Generation-2 UHF communication protocol. The wireless sensors consist of a sensor key chip and off-chip temperature and humidity sensors. The sensor key chip integrates RF/analog front-end circuit, digital baseband processor, nonvolatile memory, on-chip temperature...
This paper innovatively proposes an indoor wireless propagation model in WiFi radio-over-fiber network architecture for received signal strength (RSS) based localization in the Internet of Things. The proposed model adds attenuation terms of obstacles in each sub-space by dividing the room into several sub-spaces according to the obstacles' distribution. The influence of obstacles in sub-space on...
This work presents our recent progress on advanced radio-over-fiber (ROF) technologies for in-building optical-wireless access networks, including multiservice, full-duplex, and polarization diversity ROF system design, as well as the experimental delivery of uncompressed high-definition television (HDTV) signals. The novel polarization diversity technique is proposed to improve receiving sensitivity...
This paper presents our recent progress on advanced radio-over-fiber (ROF) technologies for in-building optical-wireless access networks, including multi-service, full duplex and polarization diversity ROF systems design, and experimental delivery of uncompressed HDTV signals. The novel polarization diversity technique is proposed to improve receiving sensitivity and increase anti-interference capacity...
With the development of wireless communication technology, offering wideband access for the rural and remote area has become an urgent demand of the market. IEEE 802.22 wireless regional access network is required to use the TV frequency band with no harmful interference to TV user or wireless microphone. Cognitive radio is its main technology to detect the environment and access the spectrum dynamically...
A novel scheme of 2.5 Gb/s optical PSK signals transmission and ASK wireless signals generation with 15 GHz carrier based on heterodyne detection is demonstrated, which can realize polarization diversity and provide 1.3 Gb/s HDTV applications.
The wireless sensor network is a type of the wireless ad-hoc networks. It is composed of nodes with limited battery power. One of the most critical issues in designing wireless sensor networks is to minimize the energy consumption for longevity. In this paper, we first entirely analyzes state clustering protocol and LEACH routing protocol, then present a novel clustering routing protocol for wireless...
Nodes in wireless sensor network have limited battery power. In order to gain longer lifetime, this paper proposes a new energy efficient routing protocol by enhancing cluster election and transmission method. In this improvement, we elect clusters by using the nodespsila surplus energy. Then, the message in clusters can be delivered by multi-hop. Simulation shows that the scheme is better than the...
Most of the current WSN research platforms are based on Mica nodes and TinyOS. However, it's difficult to be integrated with the obsolete mature source code and difficult to port to other platforms. The micro-controller based solution is also weak to take high performance tasks such as image processing. So we develope an ARM7 based powerful WSN research platform named OpenWSN. OpenWSN adopts layerfirst...
The wireless sensor network is a type of the wireless ad-hoc networks. It is composed of nodes with limited battery power. Energy saving, energy efficiency, energy balance are important technologies to prolong service life of wireless sensor networks. This paper entirely analyzes LEACH routing protocol, and presents the advantages of multi-hop transmission, then combines them, finally suggests a novel...
The resource limitations of wireless sensor networks (WSN), especially in terms of energy, require novel and collaborative approach for the wireless communication. In this paper we focus on the dynamic aspects and present a new reliable cost-based data-centric routing algorithm for such dynamic WSNs. Current research in this area generally assumes a rather static network, leading to a strong performance...
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