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Cubic metric (CM) is being recognized as a better alternative to determine the power de-rating of radio frequency power amplifiers (PAs) than peak-to-average power ratio (PAPR). However, in this letter our analysis shows that actually the CM is still inaccurate to predict the required PA power de-rating that satisfies the out-of-band radiation (OBR) requirement of a communication system. Further,...
In wireless radio frequency injection location, the observation vector and observation matrix are both noisy. The typical least squares (LS) or recursive least squares (RLS) algorithm will lead to the location estimation biased. So total least squares (TLS) algorithm was considered. However, its exact solution is rather complicated and it failure to reach the real-time requirement of wireless RF injection...
In this paper we present a numerical evaluation of a RF localization system to determine the position of a functional radio capsule released in the ventricular system of the brain. The concept is based on an AoA estimation using short UWB pulses. Although first results are quite stimulating, the initial localization accuracy is too poor for practical applications. It has been shown that this is mainly...
A new range-free solution based on simple RSSI measurements is presented herein. The proposed method includes a two-stage algorithm and is able to incorporate fingerprints of specific locations, when available, in order to enhance localization accuracy. The proposed algorithm requires a strategic placement of nodes in each room while being easily scalable to a large number of rooms and adaptable to...
This paper is mainly to investigate the positioning technology. We use RFID and ZigBee to increase positioning accuracy in house or interior space. ZigBee technologies have low-cost, low power consumption, small size, easy to fabric construction, etc. Ideally, it suited for short-range wireless transmission of leaving. There are two-way communication is superlative for indoor positioning system. RFID...
This paper describes locating systems in indoors half-manufactured environments using wireless communications framework. Such framework is available through existing communications hardware as is the case of ZigBee standard. Using this framework as locating system can provide trilateration scheme using receiver signal strength indication (RSSI) measurements. An experiment shows RSSI measurement errors...
Prediction, assessment, and mitigation of surface-affecting natural hazard processes such as landslides, avalanches, earthquakes, and floods call upon geoscientists to rapidly deploy instruments and accurately characterize these earth processes, often with little lead time and under dangerous working conditions. Affected areas may have heavy tree canopies, or high atmospheric dust loads (volcanic...
A study on robustness of location determination techniques using wireless sensor network (WSN) is presented in this manuscript. The location estimation technique used by the wireless sensor network is based on location fingerprinting technique. Theoretically, the robustness of the location estimation depends on the availability of the number of sensor nodes in the system. The degradation of location...
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