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An ideal full-duplex relay doubles the achievable data rate compared to a half-duplex relay. However, in practice, the self-interference and processing delay induces an ISI channel between the source and the destination nodes. In this paper, we study the outage performance of a full-duplex relaying network with amplify-and-forward scheme. In contrast to prior work, we include the direct link from...
Limited data speaker verification has shown its significance in practical system oriented applications. The paper shows the importance of different aspects of voice source feature for limited test data scenario. A baseline speaker verification system using conventional mel frequency cepstral co-efficients (MFCC) feature is developed and performance under limited test data condition (≤10 s) is evaluated...
3-D modeling of aerial wireless coverage is an important requirement for many an applications of UAVs. Typically such model is used in communication-aware path planning of the vehicle. When the surveillance area is vast, such as that of long linear utility infrastructures e.g. power grids, oil and gas pipelines, railway corridors etc., signal coverage is quite sparse due to lack of transmitters in...
We consider a wireless channel shared by multiple transmitter-receiver pairs. Their transmissions interfere with each other. Each transmitter-receiver pair aims to maximize its long-term average transmission rate subject to an average power constraint. This scenario is modeled as a stochastic game. We then formulate the problem of finding a Nash equilibrium (NE) as an affine variational inequality...
Sniper localization has become a very critical problem in modern day land warfare. A gunshot leaves many physical signatures which can be utilized to trace the direction and origin of it. Audio signals are by far the most reliable and affordable such signatures and have been utilized for the said task. In this paper, the characteristic shape of shock-wave waveforms along with Time of Arrival (ToA)...
This work explores the effect of breathiness component on speech under stress. The breathiness component in a speech signal can be estimated using different features such as period perturbation quotient (PPQ), amplitude perturbation quotient (APQ), harmonic to noise ratio (HNR), glottal to noise excitation ratio (GNER), harmonic energy (HE), harmonic energy of residue (HER) and harmonic to signal...
The core of the global telecommunication network consists of wavelength division multiplexed (WDM) optical transmission systems. WDM is the technology of choice as it allows for a high spectral efficiency. We propose an effective way to counter the nonlinearities like Four Wave Mixing, Stimulated Raman Scattering, Stimulated Brillouin Scattering, Cross Phase Modulation to achieve high spectral efficiency...
In an antenna array the mutual coupling between the array elements affects the resultant far filed radiation pattern. This paper presents an effective solution to the problem of mutual coupling in antenna arrays by placing sub wavelength resonators like complementary split ring resonator (CSRR) and open slot split ring resonator (OSSRR) in the ground plane. A two element patch antenna array operating...
Replicating or caching popular content in memories distributed across the network is a technique to reduce peak network loads. Conventionally, the performance gain of caching was thought to result from making part of the requested data available closer to end users. Recently, it has been shown that by using a carefully designed technique to store the contents in the cache and coding across data streams...
Hidden Markov Models (HMM) are used in handwritten strokes recognition task. The two design parameters of HMM are the number of states and number of mixtures in each state. There are two approaches for finding the number of states, namely, equal number of states and variable number of states. Since the shape of strokes will be different, variable number of states approach should be beneficial. This...
Multiple description coding has emerged as an attractive framework for robust transmission of multimedia information over packet loss and fading wireless channels. Forward error correction (FEC) based multiple description coding enables generation of an arbitrary number of descriptions from a progressive image bitstream. These descriptions are formed using erasure protection properties of Reed-Solomon...
In this paper, we obtain the maximum likelihood (ML) decision for a decode and forward (DF) cooperative system in Nakagami-m fading in the presence of co-channel interference at the relay as well as the destination. Through simulation results, we first show that conventional ML designed for interference free systems fails to combat the deleterious effect of interference. An optimum ML decision for...
We propose a distributed algorithm for tracking dynamic boundaries in a ranging sensor network. The main aim here is to minimize the number of data pushes to the sink by the observing sensors. Contour is modeled as correlated Brownian motion with drift. Sensors continuously sample the data. Neighboring sensors communicate and exploit the spatio-temporal correlation and using the parameters of the...
This paper presents an analytical model, based on a semi-Markov process, for determining the power savings achieved in a User Equipment (UE) device of a Long Term Evolution (LTE) network using the Discontinuous Reception (DRX) mechanism. Systems with and without packet buffers and the UE and enodeB are presented in this paper. Using the models, it is possible to determine the savings in power attainable...
In this paper, an array of 7 × 7 novel compact metamaterial unit cells is used as superstrate to improve the broadside gain of a microstrip patch antenna operating at the WLAN band. The proposed unit cell is obtained by suitably adding extra metal strips to the conventional mirrored S like structures. The unit cell cell analysis and parameter extraction using periodic boundary condition confirms the...
The cross polar power resulting due to illumination of an offset reflector by a linearly polarized circular feed operating in TE11 mode can be suppressed considerably by employing TE21 and TM11 modes having proper mode coefficients and relative phases. This paper presents the design and performance evaluation of such a smooth walled circular tri-mode matched feed. Using an analytical pattern for the...
Viterbi detector is widely used in communication systems for signal detection. The exact performance of the detector is of research interest ever since the algorithm was proposed. Traditional methods to characterize the performance bound the bit error rate (BER) of the detector using error event analysis and minimum distance bounds. A Markovian approach was proposed to exactly characterize the performance...
The radio channel is a critical but independent element affecting a wireless communication system. It is highly time-varying and exhibits behaviors such as path loss, shadowing, multi-path fading and Doppler spread. In this paper, we discuss the design and implementation of a real-time Multi-Terminal Channel Emulator on an SDR (Software Defined Radio) platform for providing controlled variability...
Accumulation of blood and its constituents over fovea of the retina lead to irreversible vision degradation in Diabetic Retinopathy (DR). Thus, fovea location contains very vital information in automated analysis. In this study, we have developed a simple approach for identification of fovea location. The main advantage of the method is that it does not require prior knowledge of the spatial relationship...
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