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Fingerprint recognition refers to the automated method of verifying a match between two human fingerprints which is used to identify individuals and verify their identity. A fingerprint sensor is used to capture a digital image of the fingerprint pattern. The captured image is digitally processed to create a biometric template (a collection of extracted(More)
We consider a multi-channel cognitive radio network (CRN) where multiple secondary users share a single channel and multiple channels are simultaneously used by a single secondary user (SU) to satisfy its rate requirement. For such an environment, we develop a user-based distributed approach based on a game theoretic formulation. The overall objective is to(More)
Prior research efforts on cognitive radio networks have mainly focused on effective sensing of primary users to determine the availability of a spectrum band for opportunistic use. However, when multiple secondary users compete for a limited amount of spectrum, quality of service (QoS) for these users could degrade due to interference. In this paper, we(More)
We consider a multichannel cognitive radio network where multiple secondary users (SUs) share a single channel and where multiple channels are simultaneously used by a single SU to satisfy their rate requirements. We attempt to evaluate the optimal power and rate distribution choices that each SU has to make to maintain their quality of service (QoS). Our(More)
We consider a multi-channel cognitive radio network (CRN) where multiple secondary users share a single channel and multiple channels are simultaneously used by a single secondary user (SU) to satisfy their rate requirements. In this competitive CRN, our interest is in determining optimal power and rate distribution choices for each SU while maintaining(More)
In this paper, we attempt to evaluate the optimal power and rate distribution choices for secondary users in order to maintain their quality of service (QoS) in a multichannel cognitive radio network (CRN). We assume that multiple secondary users share a single channel and multiple channels are simultaneously used by a single secondary user (SU) to satisfy(More)
This paper illustrates the superiority of using time-frequency varying averaging factor to estimate the a priori SNR for speech enhancement using spectral subtraction rules. An expression for the smoothing parameter is derived in the DCT domain. Improvements over conventional spectral subtraction rules in terms of objective quality measures e.g.,(More)
The focus of this paper is on improving the performance of the Wiener filter in speech enhancement by formulating filter gain without neglecting the crosscorrelation between the speech signal and background noise. Comparative results with the conventional Wiener filter and other reported methods confirm the superiority of the proposed method
In this work we have theoretically analysed a bi-layer waveguide placing a magnetic metamaterial on Double Positive (DPS) material and then implemented the waveguide as substrate for microstrip patch antenna and achieved 30% size reduction. This patch antenna operates at three different bands and the radiation gain at each band is quite high with a moderate(More)