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An outdoor air quality monitoring system based on ZigBee wireless sensor network is presented in this paper. A wireless network is formed by coordinators, routers, terminal notes, and especially PPB (part per billion) level high precision sensors. Data, sampled and processed by terminal notes, are sent to routers or the coordinator through a serial port, then displayed on a screen of a PC. The concentration...
Energy efficiency is one of the most important performances of a wireless sensor network. In this paper, we show that choosing a proper transmission scheme given the channel and network conditions can ensure a high energy performance in different transmission environments. Based on the energy models we established for both cooperative and non-cooperative communications, the efficiency in terms of...
The localization of a wireless device is important for current wireless networks, therefore this paper investigates the time-sum-of-arrival (TSOA) based localization method, where the Taylor Series algorithm is analytically derived according to the elliptical geometry, i.e., TSOA based Taylor Series method, and then the conventional time-difference-of-arrival (TDOA) based algorithm is provided as...
In wireless sensor networks where nodes are powered by batteries, it is critical to prolong the network lifetime by minimizing the energy consumption of each node. In this paper, the cooperative multiple-input-multiple-output (MIMO) and data-aggregation techniques are jointly adopted to reduce the energy consumption per bit in wireless sensor networks by reducing the amount of data for transmission...
We investigate the performance of an experimental wireless relay sensor network comprising a source node, a destination node and dedicated relay nodes. Two relaying algorithms, dynamic relaying and fixed relaying, are tested to find out to what extent the relaying algorithms could bring any benefit to a wireless sensor network. A simple scheme is applied at transmit nodes to eliminate the need for...
The complex behaviour of TCP over wireless channels has been the focus of much attention in recent years, and researchers experimenting with TCP are always keen to show the effectiveness of their enhancements by presenting results from many tests over differing network conditions, mainly through the use of popular network simulators, and occasionally through the use wireless testbeds. In this paper...
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