Wireless sensor networks(WSN) is an emerging network that self-organization, dynamic networking, high fault tolerance, etc., making it an extremely wide range of applications, not only can be applied to a variety of civilian areas and commercial areas, such as medical Health, environment, disaster relief, etc., can also be used in military field. In many applications
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Wireless sensor networks(WSN) is an emerging network that self-organization, dynamic networking, high fault tolerance, etc., making it an extremely wide range of applications, not only can be applied to a variety of civilian areas and commercial areas, such as medical Health, environment, disaster relief, etc., can also be used in military field. In many applications
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In China, according to statistics of building energy consumption to the total energy consumption by 27.8%, while residents of the northern winter heating energy consumption accounts for about 65% of building energy consumption, thus saving heating energy is building as an integral part. Studies have shown that, at this stage of the heating system in
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The sensor nodes of wireless sensor network have small size and use battery-powered. Thus the processing and storage capacity, the communication range, energy and other issues of a single node is limited. However, the adjacent nodes in the shared channel can easily cause collision in data transmission, this not only leads to increase packet loss
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With the transition of TV signal from analog SD to digital HD, flat-panel TV will inevitably replace CRT TV. The sheer number of sharply increasing flat-panel TV has imposed unprecedented pressure on domestic electric power and energy capacity. The technology of energy-saving is the solution to the energy shortage dilemma.What this thesis discusses is a
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Routing protocol is a major function of network layer, a base for communication among network nodes and a hot research question in Wireless Sensor Network (WSN).This paper focuses on routing protocols of WSN. Firstly, it introduces WSN’s conception, architecture, application prospect and status, analyzes the characteristics, performance index, key technology of routing protocols and some
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A wireless sensor networks (WSNs) has important applications such as remote environmental monitoring and target tracking. This has been enabled by the availability, particularly in recent years, of sensors that are smaller, cheaper, and intelligent. These sensors are equipped with wireless interfaces with which they can communicate with one another to form a network. The
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There exist two major problems in a multi-channel ultrasonic ranging system, one is the crosstalk phenomenon, and the other is contradiction between effective ranging distance and ranging resolution. To solve the two problems, spread-spectrum technology and coding method are applied to the ultrasonic ranging field. The pulse-code-modulation sequences are used to drive the ultrasonic transmitting
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With the wireless network construction step by step and the number of users is growing, the number of mobile communication base stations increasing, which means that the base station power demand is growing. According to statistics in recent years of operation, mobile communication base stations and network room power consumption accounted for 60%-70% of total
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Recently, with the sharp increase of the cellular users, typical cellular networks have quickly been large-scaled systems, and the cellular networks have also emerged as one of the dominate comsumers of the world energy, which brings large pressure and great challenge to the ecological environment. Besides, larger and larger energy costs have troubled all service
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