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Rule based filter is a set of ordered filtering rules. Each rule is formed of a condition and an action. Condition is a set of network fields and can be seen as points in a topological space. Consequently each firewall rule can be seen as a region within the space of filtering fields. Anomalies are relations between rules that hint at possible misconfiguration of firewalls. In this paper, we put forward...
Optical networks are now evolving due to the high bit rate demands of multimedia applications and internet services. These applications demand high bandwidth and the current fixed grid network can no longer work for data rate of 400Gbps or higher. This paper focuses on Link Margin (LM) and its effect on the spectrum saving for the demand of 100Gbps and 1000Gbps in a point to point optical link. Optical...
We study the impact of heterogeneity of energy in hierarchically clustered wireless sensor networks. Heterogeneity in energy of the sensor nodes can be because of (i) differences in transmission levels of sensor nodes, (ii) differences in initial energies, or (iii) due to introduction of high energy sensor nodes within the sensor network to revitalize it [11]. Clustering protocols divide sensor nodes...
Wireless Sensor Networks (WSN's) are resource constrained networks, demanding energy efficient cryptographic algorithms in order to extend security to them. When compared with the popular RSA algorithm, Elliptic Curve Cryptography (ECC) offers similar level of security with smaller key size requirements. An efficient implementation of ECC heavily relies on the scalar multiplication operation. An efficient...
In this paper we present the performance of 4×4 optical data vortex optical interconnection network in view of BER characteristics. Cascading of SOA based switching nodes is simulated.
When the maximum frequency offset to be acquired is a small fraction of the symbol-rate, a DFT-pair based carrier acquisition method (a frequency-domain analog of the early-late gate synchronizer) provides low-complexity frequency-offset acquisition using a modest number of symbols. Several new modulation and coding standards (e.g., DVB-S2, allowing receivers to operate at lower Eb/N0's) require that...
A spectral subtraction technique is presented for real-time speech enhancement in the aids used by hearing impaired listeners. For reducing computational complexity and memory requirement, it uses a cascaded-median based estimation of the noise spectrum without voice activity detection. The technique is implemented and tested for satisfactory real-time operation, with sampling frequency of 12 kHz,...
In this paper, epoch and spectral features are explored for classifying infant cries. Different types of infant cries considered in this work are hunger, pain and wet-diaper. In this work, mel-frequency cepstral coefficients (MFCC), epoch interval contour (EIC) features are used for representing the infant cry specific information from the acoustic signal. The information contributed by the excitation...
Recognition of expressions from speech has emerged as an important research area in the recent past. However, the scientific community still faces problems in differentiating between angry and lombard speech. The objective of this work is to analyze the differences between the Lombard and angry speech using the features representing the excitation source of speech production. The instantaneous fundamental...
This paper proposes a modified pitch markers generation method that can be used for both pitch and duration modification. Except for changing some input parameters, the method remains common for both. The original pitch markers, modification and scaling factors are the input to the method. The modified pitch markers will be the output, generated according to the given modification and scaling factors...
An unrestricted text-to-speech system is expected to produce a speech signal, corresponding to the given text in a language, that is highly intelligible to a human listener. Presently, unit selection-based synthesis (USS) and statistical parametric synthesis techniques are the state-of-art techniques for this task. Earlier, in [3], a concatenative synthesizer was developed for the language, Tamil,...
Adaptive identification of sparse systems is one of the popular adaptive signal processing topics due to its application in acoustic and network echo cancellation, adaptive channel estimation and several other areas. It has been observed that sometimes the amount of sparseness in the identifiable system impulse response can vary greatly depending on the nonstationary nature of the system. The compressive...
Switch and Stay combiner (SSC) is a diversity combiner which can be used in practice as it offers less switching transition compared to popular selection diversity combiner. Performance of a dual Switch and Stay combining diversity receiver is analyzed in correlated generalized-K (KG) fading channels. Mathematical expressions for a number of performance measures such as the probability density function...
Parallel concatenated Gallager codes (PCGC) is a class of concatenated codes based on LDPC component codes. Conventional attempts for concatenating LDPC in parallel using the well known ‘Turbo code structure’ without interleavers have not been widely successful, because of its performance limitation and decoding delay. In this paper we present an efficient methodology for parallel concatenation of...
In recent years Green technologies are emerging as important research efforts to develop strategies to reduce the energy consumption in the network and also to develop energy efficient architecture for the optical networks. In this work we have considered typical optical backbone network architecture, and have minimized the operational power primarily for provisioning techniques. Typically, operational...
On behalf of the organizers of the 2013 National Conference on Communications (NCC), we thank all the authors and delegates of the conference for making it a success.
Cooperative diversity is a viable technique to improve the communication reliability and the system throughput. We consider a system comprising of a source (S), a relay (R) and a destination (D). Relay cooperation is achieved through decode and forward protocol. A realistic scenario which considers correlation between SD and RD links is a hardly dealt topic in the literature. Hence, in this paper,...
In this paper we have proposed Noise Induced HSI model based noisy and blurred colour image segmentation technique. This approach uses additive noise to suppress the effect of internal noise present in an image for proper detection of objects from such images. In this algorithm we decompose a given image in Hue, Saturation and Intensity (HSI) components and then apply processing on intensity component...
In this paper, a dynamic texture based compression scheme is devised for videos. Correspondence analysis is explored for the analysis of motion patterns in a video on the basis of optic flow data and then clusters of different motion patterns are created. Dynamic textures tend to disobey Horn and Schunck's assumption of brightness constancy and hence, optic flow residual is used as an indicator of...
In this paper, we propose a novel pilot-aided joint carrier frequency offset (CFO) and channel estimation method for orthogonal frequency division multiple access (OFDMA) uplink systems operating in doubly-selective fading environments. The method makes use of Bernstein basis polynomials (BBP) for capturing the time variations of the channel. By representing the channel in terms of basis functions,...
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