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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...
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 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 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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