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In Vehicular Delay Tolerant Networks (VDTN) connection from source to destination at any required period is not necessarily available. Therefore, the node with the message, save it in its own buffer and carry it until an opportunity comes across for forwarding. Fix nodes enhances the performance of VDTN. It helps in message storage and relaying messages. Due to mobility the bit error rate is high...
Here we present a new algorithm for the separation of convolutive speech observations using recordings from 2 microphones. This method is the union of independent vector analysis (IVA) and ideal binary mask (IBM), in conjunction with a post-filtering process in the cepstral domain. The proposed algorithm comprises of 3 steps. In the first step, an IVA algorithm is applied for the separation of the...
This work presents new least significant bits based steganography technique to embed secret information in the five least significant bits of single channel out of three primary channels of RGB color image, at a time. The 5 least significant bits (5LSB) substitution technique make use of these individual channels as cover media and hide secret information in either red (R), green (G) or blue (B) channels...
Nonlinearities play an imperative role in performance of wireless communication systems. In this paper, High Power Amplifiers (HPA) have been used to check the performance of the proposed system by analyzing its amplitude, phase and their joint distortions using Multiple-Input Multiple-Output (MIMO) wireless communication system. This paper takes-in account the overall effects of HPA that provokes...
Internet is one of the basic requirements of the current age. Rural areas, particularly in the developing countries, do not have access to internet. Infrastructure based communication is very expensive, which makes it infeasible for the inhabitants of the backward areas. The presence of sparse nodes in the rural areas compared with urban areas decreases the chances of interaction among nodes. This...
This paper proposes the modifications in the Least Square (LS) estimator for the Orthogonal Frequency Division Multiplexing (OFDM) over fast fading Rayleigh channels in the presence of the Additive White Gaussian Noise (AWGN) to optimize its performance. The LS estimation has an inherent channel noise that degrades its performance. In our work, modifications in the LS estimator were proposed to reduce...
With the rapid introduction of new and innovative applications for handheld and On-board navigation devices and evolution in their hardware capabilities, the need for efficient and convenient resource provision for users arises. We propose user preferred optimal path route selection algorithm incorporating POIs or point of interests (POIs) that the user intends to traverse. Geographic area has been...
The use of the efficient interpolation technique with low estimation error is imperative for estimating the channel impulse response at data subcarriers for pilot assisted channel estimation techniques in the Orthogonal Frequency Division Multiplexing (OFDM) systems. In this paper, a novel interpolation technique based on one dimensional interpolation is presented. The proposed interpolation technique...
In this paper, the performance of the Least Squares (LS) estimator along with turbo codes in OFDM is evaluated for the SUI channel models in the presence of AWGN. Turbo codes are used in this paper because of its BER performance close to Shannon limit. The iterative turbo decoder exchanges soft information between the component decoders. Maximum A Posteriori (MAP) and its simplified version Max-Log-MAP...
The Ad Hoc On-demand Distance Vector (AODV) routing scheme is a widely used routing technique in ad hoc networks due to its low routing traffic overhead. However, the performance of the minimum hop routing used by AODV degrades significantly when the underlying system has routes that have high throughput and hop count. In this paper, we propose modifications to the routing metric and the route discovery...
Nonlinearities in wireless communication channels foil the performance of the communication systems either at the transmitter or receiver end. This paper explains the concept of the transmitter-side nonlinearities that are induced by the High Power Amplifiers (HPA), the final stage at the transmitter side of the communication system. HPA nonlinearities create in-band and out-of-band distortions in...
This work explores developmental plasticity in neural networks for forecasting the trends in the daily foreign currency exchange rates. With this work we achieved an efficient artificial neural network (ANN) based dynamic prediction model that make use of the trends in the historical daily prices of the foreign currency to predict the future daily rates while modifying its structure with the trends...
The modern communication system has made the world a “Global Village” in true sense. However, as the number of users of this communication system is increasing, the challenges are mounting as well. The users send different types of traffic to the network, however it is necessary that the traffic must conform to the specified network parameters otherwise it will be troublesome. In case the sent traffic...
Nowadays, Wireless Sensor Networks (WSN's) has become progressively more attractive and has found its way into a wide variety of applications and systems because of its low-cost, self-organizing behavior and sensing ability in harsh environments. A WSN is a set of nodes arranged into a network. Routing is a vital technology in WSNs. It can be split into two groups namely flat routing and hierarchical...
Researchers are showing more and more interest in the Vehicular Ad Hoc Networks (VANETs) as it is found the most suitable mean for road safety, effective monitoring and control of traffic and global connectivity at all times as desired currently and in the future ahead. VANETs do not face the energy resource constraint which makes them suitable for larger coverage and network life time. However, due...
Acoustic sensors or sensor networks can be efficiently used to spot and observe targets of interest and have the ability to conclude the exact location of an object or event within the sensor network's coverage range. For the detection and spot estimation of shooter, the schemes of gunshot localization require one or more sensing technologies. In current situation the importance of counter sniper...
Most on-demand Mobile Ad Hoc Network (MANET) routing schemes typically assume operation over symmetrical and bidirectional routing paths, both of which are not feasible due to the inherent heterogeneous properties of wireless devices. Radio links between a set of wireless devices may be asymmetrical and unidirectional as a result of factors such as high mobility, packet collisions due to interference...
High Data Rate (HDR) Meshed Wireless Personal Area Networks (MWPANs) primarily use TDMA as the medium access mechanism. The Mesh Piconet Coordinators (MPNCs) need to reserve channel time slots for inter cluster and intra cluster communication in a superframe shared by MPNCs in the transmission vicinity of each other. In case of distributed channel reservation schemes for single flows, the issues of...
Mobile ad hoc networks (MANETs) are rapidly evolving and the notion of ad hoc networking has become one of the most challenging research areas of wireless communications. The rising popularity of real-time applications among end users in MANETs has stimulated a surge of research in routing and providing quality of service (QoS) support in such networks. Capacity estimation is a key component of any...
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