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Wide area ubiquitous networks should have the capability to handle more than 10,000 wireless terminals in a large wireless cell with the radius of several kilometers. However, the functions of wireless terminal are severely limited due to low power consumption and low cost requirements. Therefore, there is a need for a sophisticated wireless access system that employs smart wireless signal processing...
The location estimation in sensor networks is of great current interest. A general approach to location estimation is to gather Time-of- Arrival (TOA) measurements from a number of nodes and to estimate a target location. The two major sources of range measurement errors in geolocation techniques are measurement error and Non-Line-of-Sight (NLOS) error. NLOS errors caused by blocking of direct paths...
A new wireless network for the wide area ubiquitous network (WAUN), which is used for transmitting and receiving information for sensors and actuators, is studied. The wireless network for the WAUN needs to have wide cell coverage with a low transmission rate to support new applications economically using low-end wireless terminals. The transmission power of the wireless terminal of the WAUN must...
This study describes a human activity monitoring system that uses microelectromechanical systems (MEMS) sensors. The prototype system contains four sensors for ambient monitoring: 3-axis acceleration, barometric pressure, temperature, and relative humidity. The peripheral circuitry for each sensor is connected to a one-chip microprocessor. The measured data is stored in memory and transferred via...
Likelihood ratio test (LRT) and best linear unbiased estimator (BLUE) have been researched as estimation methods of observation event in sensor network. LRT and BLUE can estimate the observation event with high accuracy at the fusion center (FC) when the FC has a perfect knowledge of observation statistics of each sensor node. However, all the sensor nodes' observation statistics are not always available...
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