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Ultra Wide-Band (UWB) Antennas offer large frequency bandwidth which is beneficial for various wireless communication standards. In UWB antenna systems, the transformation from input impedance to impedance of the free space is very crucial. Hence, this paper presents a distinctive impedance coupling technique known as Coplanar Waveguide (CPW) to feed the antenna. This helps in achieving low dispersion,...
The Meta-Material (MM) encompasses various unique properties viz. negative index of refraction, -∊ & -μ, backward wave propagation which embellish the performance of antenna. The paper emphasizes on the incorporating MM lens with dual band antenna for enhancing its performance parameters viz. gain, directivity, main lobe level, bandwidth, radiating power and maximum power per unit area. The coaxial...
This paper emphasizes on improving the efficacy of patch antennas with meta-material lens embedding. Antenna performance is described in terms of various performance metrics viz. efficiency, gain, directivity, main lobe and power radiation level and bandwidth. For enhancing these parameters Metamaterials (MMs) are used as an uniform flat lens along with the antenna. For analysis purpose, a patch antenna...
Coplanar waveguide (CPW) fed slot antennas are attractive due to low dispersion and ease of integration with active and passive devices. In this paper, design of slot antenna fed by CPW through capacitive coupling with finite ground plane is presented. The propose antenna exhibit perfect impedance matching, unidirectional radiation patterns, and low cross polarization. Analysis of the effects of various...
The MetaMaterial (MM) encompasses various unique properties viz. negative index of refraction, − ε & −μ, backward wave propagation which embellish the performance of antenna. The paper describes the properties of MM and designing of the MM lens. It emphasizes on the incorporating MM lens with antenna for enhancing its performance parameters viz. gain, directivity, main lobe level, bandwidth, radiating...
The paper aims at improving the radiation efficiency and enhancing the gain of a Conformal Patch Antenna (CPA). It evaluates the performance of the CPA in terms of various metrics viz. efficiency, gain, directivity, main lobe level, power radiation level and bandwidth. In order to enhance these parameters, Metamaterial (MMs) is used as a uniform flat lens in front of designed CPAs. The paper demonstrates...
One of the application in satellite communication is to capture and transmit high quality and hyper-spectral images back to the ground station. These images require very high bandwidth, more transmission time and large storage memory. Moreover, the link used for communication is susceptible to various noises. Hence, need for image compression with high compression ratio and channel encoding technique...
The demand for secure communication over the link has augmented the need for robust algorithms. In order to ensure confidentiality, authenticity and integrity of the messages transmitted, the algorithms must facilitate high efficacy. In this paper, we have implemented a method for sharing secret messages encrypting them in gray-scale images, that are processed with Discrete Wavelet Transform (DWT)...
High quality color images transmitted wirelessly should exploit minimum resources. Hence designing algorithms that are adaptive in nature has become imperative, in order to achieve the growing demands of multi-media communication. This paper implements a unique image compression technique known as ‘Cognitive Sub-Band Replacement Discrete Wavelet Transform (CSR-DWT)’. The designed algorithm performs...
Communication technologies have superseded X10systems in automation industry. Various high performance wireless technologies are implemented for remote monitoring and controlling of loads. This has resulted in revolutionizing automation systems in industrial, commercial and residential sectors. Depending upon the application spectrum, network range, power consumption constraints etc. A competent communication...
Due to the Human Visual System (HVS) the response to well brightened images is frequency dependent. The Discrete Cosine Transform (DCT) - based compression schemes are capable of separating the perceptually significant information in an image from the information that the eye cannot perceive. Hence in image compression, DCT is most widely used transform. In this paper, an algorithm for compressing...
Satellite images are multi-spectral in nature that operate over wavelengths of wide range frequencies known as bands. Hence, they need to be processed cautiously. This paper presents a 4-Level DWT based Sub-Band Replacement (SR-DWT) Image Compression scheme, for LANDSAT satellite images. The algorithm is designed to compress various color band images captured by the satellite payload. By performing...
Images with texture patterns have embedded feature of offering visual patterns, that have the property of homogeneity. They provide cardinal information pertaining to the structural arrangement of the surfaces. Huge databases containing such images require highly competent compression schemes. This paper proposes a compression scheme for gray-scale texture images based on a unique Discrete Wavelet...
In the image processing domain, researchers all over the world aim at designing algorithms which posses the feature of facilitating multiple advantages amalgamated in one scheme viz. compression, fusion, enhancement, security etc. In various classified applications such as military, medical, forensics etc, the image databases are huge and contain a lot of information. Hence, compression of these high-quality...
The potential ability of Global Positioning System (GPS) to assist navigating and tracking application facilitates in determining precise object positioning on earth. In order to efficiently execute tracking operation, GPS is dependent on various parameters viz. reliability of RF communication link, satellite geometry, GPS antenna placement, parameters to decode NMEA (National Marine Electronics Association)...
Images pertaining to any application area can embrace all the information that is visualized by Human Visual System (HVS). In order to perceive this complete information and to extract better features from the image, various image enhancement techniques have been developed. In multi-spectral satellite imagery, the images captured by the payload comprise of wide range of wavelengths, known as bands...
The increasing growth of communication has fostered research on various methods to obviate noise from affecting the data transmitted over the link. Low Density Parity Check (LDPC) has gained popularity because of its property of exhibiting near Shannon limit performance when interpreted via iterative probabilistic algorithm. This paper presents a high performance and an enhanced LDPC based algorithm,...
The area of image processing has offered remarkable ideas and competent compression algorithms in the past few decades. The accretion of data generated by applications validate the use of different image compression schemes to decrease the storage space and time for transferring the images over the link. Each of the compression schemes provide different image quality metrics viz. PSNR, MSE, Compression...
The area of image processing has offered remarkable ideas and competent compression algorithms in the past few decades. The accretion of data generated by applications validate the use of different image compression schemes to decrease the storage space and time for transferring the images over the link. Each of the compression schemes provide different image quality metrics viz. PSNR, MSE, Compression...
Transmission of critical data over the link, in the presence of an attacker has augmented the demand for secure communication. Particularly in the military field, exchange of classified images has to be executed with extreme caution. Advanced digital technologies require encryption, authentication and key distribution techniques to facilitate reliable and secure communication. In this paper, Discrete...
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