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The MANETs and UAV networks would soon replace existing Wireless technology due to its ease to deploy and bare minimum infrastructure requirement and dynamic topology. Emergence of vast high speed hand-held mobile devices, mail delivery drones, drone camera footage of a live cricket match etc, have reserved MANETs/UAVs in the reach of a common man. Therefore, it is imperative to address ubiquitous...
Now-a-days many unauthorized users try to get the protected information and therefore it is necessary to secure our data. Besides, there are also scenarios that data hiding needs to be done in the encrypted domain or combined with the encryption, especially in the age of big data and cloud computing. In previous method first encryption was done and then the room was vacated to hide the data. But there...
This paper analyses a multiplexing technique based on duty cycle division, known as duty cycle division multiplexing (DCDM). This new technique is studied for various perspectives of theoretical and simulation analysis on the basis of signal energy and symbol error rate (SER) taken as its performance measure. A wireless channel based on free space propagation model is considered for simulation studies...
This paper first briefly introduces the basic model of the FH/QPSK (Frequency-hopped Quadrature Phase Shift Keying) communication system and the interference noise model under the partial-band interference. Then it decomposes the receiver signal into direct signal component and diffuse signal component, analysis of partial-band interference effects on performance of FH/QFSK receiver under Rician Fading...
This paper focuses on performance enhancement for stand-alone Global Navigation Satellite System (GNSS) positioning. To speed up the realization of satellite position, a novel technique is proposed for GNSS satellite orbit fast fitting, which contributes to the acquisition of GNSS satellite signal deeply. The ephemeris orbit model is imminent by different fitting algorithms and polynomial interpolation...
In single constellation, such as GPS, BDS, Galileo or GLONASS, the tracked signals are susceptible under the obstruction with many high buildings or city canyon around. In this case, faulty satellite is just able to be detected by conventional Receiver Autonomous Integrity Monitoring (RAIM), while we cannot identify it with only one redundancy satellite. In this paper, we propose a novel RAIM scheme...
A Viterbi algorithm for decoding of the convolutional code is a powerful method for controlling errors in data transmission over a noisy channel. It is based on maximum likelihood algorithm for decoding the data. However, the hardware implementation of Viterbi algorithm become crucial as it consumes large resources due to its complexity. This paper discussed the implementation of ½ rate convolutional...
A cognitive radio system requires the QoS of the primary user maintained while the spectrum allocated to the primary user is used by the Secondary user. The primary user in such cognitive radio system may use a queue to store packet during transmission. In such a system the stability of the queue has to be ensured. This sharing of available spectrum may happen through any of the modes of operation...
With increased demand of high data rates with mobility, broadband wireless services have seen tremendous growth in recent past years. The mobile Worldwide Interoperability for Microwave Access (WiMAX) is based on IEEE 802.16 standard and is used for wireless Metropolitan Area Network (MAN). The IEEE 802.16 standard supports high data rate and high capacity in mobile Broadband Wireless Access (BWA)...
More number of accidents are reported on railway level crossing in recent years. The major causes for these accidents are inaccurate detection of track occupancy. The objective of the proposed work is to develop a "Wheel Detection based level crossing safety system" that detects the railway track occupancy status accurately. The existing techniques such as Imaging, Localization, Axle counters,...
In wireless networks, demand of communication of multimedia data is increasing day by day. Multicast networks help to improve network performance by transmitting data to multiple receivers at single instance in terms of bandwidth consumption, node energy and network congestion. Due to high mobility in Mobile Ad-hoc networks (MANETs), link failure occurring more frequently. In this paper, we are trying...
In this paper, we propose a scalable hybrid-medium access control (MAC) protocol for inter-M2M communications, which combines the benefits of both contention-based and reservation-based medium access schemes. This protocol facilitates concurrent transmissions through spatial reuse. We assume that the contention and reservation portion of M2M devices is a frame structure, which is comprised of two...
This paper deals with the application of H-ARQ techniques to reliable end-to-end data communications with adaptive adjustment of parameters according to the type of business in aerospace information network, whose applications have to cope with accurate Quality-of-Service (QoS) requirements. In the adaptive H-ARQ strategy, we adopt cell-level RS code as Forward Error Correction (FEC) coding scheme...
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