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Measurement of a physical parameter can adversely be affected by several factors like manufacturing process variations, environmental conditions etc. The measured output may non-linearly vary with many of these factors and may cause error in the parameter being measured. A precise modeling of the input-output relationship of measurement systems is indeed a necessity in order to have an accurate measurement...
This article addresses a grid-based target searching problem in a multi-searcher single-target environment. In the problem, the mobile sensors and the mobile object are the searchers and the target, respectively. The problem is described as follows — the target enters into a grid from any one of the sides and aims to exit the opposite side; the searchers try to search the target before the target...
Rapidly increasing user data base and escalating bandwidth demand has compelled Telecom Regulatory Authority of India (TRAI) to open up new spectrum bands for Long Term Evolution (LTE) access lying in TeleVision White Spaces (TVWS) for auction. But rural areas are not likely to respond to the such large bandwidths open to them. The paper proposes implementing Wireless Regional Area Network based on...
Secure indoor positioning is critical to successful adoption of location-based services in buildings. However, positioning based on off-the-air signal measurements is prone to various security threats. In this paper, we provide an overview of security threats encountered in such indoor positioning systems, and particularly focus on the relay threat. In a relay attack, a malicious entity may gain unauthorized...
Cognitive radio (CR) systems need to detect the presence of licensed primary user (PU) reliably. Cooperation among multiple CRs helps to enhance the reliability of detection of the PU in case of unreliable decision by a single CR due to channel uncertainties. In this paper, we consider cooperative spectrum sensing (CSS) based on energy detection in cognitive radio networks (CRN) which uses soft combination...
Repeated exposures to psychological stress can lead to or worsen diseases of slow accumulation such as heart diseases and cancer. The main challenge in addressing the growing epidemic of stress is a lack of robust methods to measure a person's exposure to stress in the natural environment. Periodic self-reports collect only subjective aspects, often miss stress episodes, and impose significant burden...
Although random deployment is widely used in theoretical analysis of coverage and connectivity, and evaluation of various algorithms (e.g., sleep-wakeup), it has often been considered too expensive as compared to optimal deterministic deployment patterns when deploying sensors in real-life. Roughly speaking, a factor of log n additional sensors are needed in random deployment as compared to optimal...
Tracking of movements such as that of people, animals, vehicles, or of phenomena such as fire, can be achieved by deploying a wireless sensor network. So far only prototype systems have been deployed and hence the issue of scale has not become critical. Real-life deployments, however, will be at large scale and achieving this scale will become prohibitively expensive if we require every point in the...
Future wireless services are expected to provide data-rates in the order of 1 Gbps in local area and 100 Mbps in wide area. A very wide bandwidth is required to support such high rates, in the order of 100 MHz: this wideband will not be available for each operator, thus a shared access to the spectrum among operators is needed. An holistic approach to spectrum sharing is adopted in this paper: not...
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