The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Positioning techniques are known in a wide variety of wireless radio access technologies. Traditionally, Global Positioning System (GPS) is the most popular outdoor positioning system. Localization also exists in mobile networks such as Global System for Mobile communications (GSM). Recently, Wireless Local Area Networks (WLAN) become widely deployed, and they are also used for localizing wireless-enabled...
Swayam cube satellite hosts a passive magnetic attitude control system (PMACS), achieving two axis stabilization and allowing the satellite to rotate about its antenna axis. As a result, power generated by the body mounted solar panels is variable and unregulated. Estimating the power budget and solar panel output for cube satellites which are passively stabilized is challenging. The solar panel output...
Due to the bandwidth efficiency and high robustness in delay dispersive multipath fading channel, the OFDM system is most widely adopted by different digital communication systems, as their main modulation technique. The major problem in the OFDM system is its sensitivity to the channel conditions, hence leads to synchronization errors. The main problems are ISI and ICI, due to delay dispersion of...
Most of the scientific operation involve floating point computations. It is necessary to implement faster multipliers occupying less area and consuming less power. Multipliers play a critical role in any digital design. Even though various multiplication algorithms have been in use, the performance of Vedic multipliers has not drawn a wider attention. Vedic mathematics involves application of 16 sutras...
Cognitive radio is an intelligent software-defined radio that solves the matter of spectrum shortage. In case of spectrum sharing network, one of the targets is to obtain balance between two contradictory goals that are to progress the performance of the secondary user and to decrease the interference to the primary users. In our paper we consider a primary and a secondary or cognitive link in a fading...
In this paper, a new set of features for addressing the problem of unsupervised query-by-example spoken term detection is proposed. The main purpose of this is to find a spoken query in large speech databases. In unsupervised audio search, language specific resources are not required. Thus this system is more appropriate in cases where enough training data is not available for creating an Automatic...
Cognitive Radio (CR) is viewed as a revolutionary potential radio technology capable of offering dynamic spectrum access. CR Networks (CRNs) with such spectrum aware devices is a hopeful solution to the spectrum scarcity issue in wireless communication sector. In this paper, an effective routing solution with a cross layer design is proposed for the multi-hop CRNs. Most of the existing work uses Ad-hoc...
In this paper a control strategy for robotic manipulator based on the coupling of the Backstepping sliding mode control (BSMC) and equivalent control approach has been presented. Initially, the Proportional Integral Derivative (PID) controller has developed for three different control strategies (IATE, ISE and ISTE) using GA. BSMC has developed for best optimal criterion by using GA. The main objectives...
The resource constrained applications in the present day communication networks demand the use of new cryptographic protocols and hardware with reduced computational and structural complexity. The use of standard, standalone cryptographic primitives are not suitable for such applications. This paper proposes the implementation of a new integrated system for both encryption and authentication based...
In this paper, Sentence level Sentiment Analysis of Malayalam movie reviews is done by classifying the polarity of opinions obtained from the user as positive, negative and neutral. Sentiment analysis is an application of Natural Language Processing and text analysis which helps to identify the emotions in a given context. In this work a hybrid approach for Sentiment Analysis is used in which Machine...
A successful approach for denoising, especially in medical applications, is Non-local means (NLM) filtering. Recently several variations of the basic NLM algorithm have been proposed. In this work we propose a modified NLM approach. NLM approach exploit redundancy in images. We have considered the basic NLM algorithm, where, in order to modify a pixel, the values of all the pixels in the image are...
In this paper a summary is given of the ongoing research work at Vikram Sarabhai Space Centre, Trivandrum on Wireless Instrumentation System (WIS) for Satellite Launch Vehicle applications. WIS is based on the physical layer (PHY) of IEEE802.15.4, Low Rate Wireless Personal Area Networks Standard (WPAN). However the researchers have pointed out the unsuitability of available 802.15.4 standard in terms...
The performance evaluation of different PPM demodulation schemes employed in PPM based IR-UWB receivers designed to meet the specifications of the IEEE 802.15.6 Standard are presented. The four different PPM demodulation schemes have been investigated for the demodulation of the standard based transmitted signal specific to the PHY layer. The performance evaluation is carried out for two different...
The recent trend of proliferation of road accidents and fatalities, calls for a methodology that can appease the burden on the drivers during certain crucial moments, requiring fast response and decision making. This paper expatiates a novel and effective procedure for determining the steering angle required to keep the vehicle in the middle of the lane. The procedure used is divided in multiple stages...
Security, reliability and hardware complexity are the main issues to be addressed in resource constrained devices such as wireless sensor networks (WSNs). Secure channel coding schemes have been developed in literature to reduce the overall processing cost while providing security and reliability. The security of a channel coding scheme against various attacks is mainly decided by the nature of intentional...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.