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Due to the unreliable nature of wireless links, sensor nodes frequently encounter degraded performance or lack of connection. This paper provides a real-time status monitoring and channel error diagnosis method in a wireless sensor network. It uses a poll and echo procedure to efficiently collect some physical layer and link layer statistics from both transmitter side and receiver side. A machine...
Short-range wireless positioning and inertial measurement unit (IMU) have been widely used in indoor positioning systems. However, wireless signals fluctuate seriously and the accuracy of low-cost IMU system suffers from gyroscope drift, magnetic interference and accumulative error. In this paper, we propose a fusion positioning system based on Wireless signal, Map information and Inertial sensors,...
Most existing works on video transmission over wireless multi-hop networks only consider routing as a network layer problem and have been decoupled from application. Traditionally, the multi-path routing protocol selects paths with lower hop counts and discards routes with higher hop counts, which are application-agnostic. However, the paths with minimum hop counts are not always the least delay ones...
To reduce the energy consumption and prolong wireless sensor networks lifetime, a code adaptation control algorithm incorporating information correlation characters and Monte Carlo method is proposed. To identify the data frame types correctly, four communication models are proposed. This approach reduced communication channel load evidently and experimentally verified on micaz.
Wireless sensor networks consist of a large number of sensor nodes with limited power and resource. To prolong network lifetime, the energy consumption must be somehow reduced. In this paper, we propose a superframe adaptation control algorithm for energy saving. The objectives are to use time division to prolong sleeping time of each sub-node and to reduce collisions of packets in MAC layer while...
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