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Orthogonal Frequency division multiplexing is the modulation technique used for the fourth generation wireless communication system. In OFDM, Signals can be modulated by multiple carriers. OFDM uses the bandwidth of the spectrum efficiently. But the limitation of the OFDM system is the high Peak to Average Power Ratio (PAPR) which results in the degradation of the signal quality. Hence reducing the...
One of the attributes to be developed in the graduating engineer, is the ability to use ‘Modern Engineering Tool’. In this work, we present a method of introducing the Engineering Tool. The proposed method can be introduced in any semester, and when introduced in a number of semesters, it leads to an overall development of the competency in a graduate. The focus of the work is to suggest a method,...
Outcomes Based Education (OBE), is penetrating the Engineering Education system at an increasing pace. Today, every activity, every course, is measured by the Outcomes being addressed. The outcomes of a program are the set of competencies acquired by the student at the time of completion of the program. The broad guidelines for desired competencies are defined by the accreditation bodies. The focus...
This paper proposes a new orthogonal frequency division multiplexing (OFDM) system, based on discrete cosine harmonic wavelet (DCHWT) for PSK and 16-QAM modulated signals. This system uses energy compaction property of discrete cosine transform (DCT) that provides low leakage in subcarriers. DCHWT based OFDM system provides improved performance in terms of bit error rate (BER) and reduction in the...
An OFDM based on Analytic Discrete Cosine Harmonic Wavelet Transform (ADCHWT_OFDM) has been proposed in this paper. Analytic DCHWT has been realized by applying DCHWT to the original signal and to its Hilbert transform. ADCHWT has been found to be computationally efficient and very effective in improving Bit Error Rate (BER) and Peak to Average Power Ratio (PAPR) performance. Improvement compared...
The Program Educational Objectives (PEOs) are a set of broad statements that describe the purpose of floating a program. The PEOs help stakeholders select a program: it helps students choose the program in an Institution, it helps industries choose the graduates of a program, it helps parents select guide their ward. Hence, PEOs form an essential constitute of a program. In this work we present the...
Ubiquitous connectivity to the internet coupled with Gen Z preferences to connect and share their learning experience anytime, anywhere, presents an opportunity for academic institutions to promote social learning practices amongst the students and to engage with them in a better way to improve learning outcomes. Technology enablement for capture of student interactions presents rich analytics to...
Implementation of Outcomes Based Education (OBE) has become essential to ensure the quality of Graduates from a program. The accreditation norms emphasize the need to: (i) develop the ability to apply knowledge of sciences and engineering to solve, design, develop, implement, test, analyze systems/sub-systems related to the engineering domain, (ii) develop the ability to perform in diverse teams through...
Massive Open Online Courses (MOOC) offer web-based learning to a global audience. While we have so many institutions offering online courses, not many of them focus on laboratory courseware that would inculcate hands-on learning. Engineering is all about hands-on learning of concepts and needs an effective online laboratory courseware to complement the theoretical courses offered by MOOC. Unlike many...
Medical imaging and computer aided diagnosis traditionally focus on organ or disease based applications. CAD is used by radiologists as a second opinion in detecting tumors, accessing the extent of diseases and making diagnostic decision. Automatic segmentation of tumor from CT images is difficult due to size, shape, position and presence of other objects with the same intensity present in the image...
In this work we present laboratory implementation of some experiments in the domain of Analog and Digital Communication. Usually different circuits are used for each experiment, and sometimes, ‘plug-in’ modules are used to connect and observe waveforms at different stages of the modulator. The single circuit proposed can be used to generate the three forms of amplitude modulation: standard amplitude...
In this work it is proposed to demonstrate usage of LABVIEW simulation platform to help comprehend concepts in the Under Graduate course on ‘Digital Communication’. We begin with topics covered in the course and discuss topics that can be introduced using the LabVIEW platform. Some concepts introduced are: sampling theorem, base band transmission, digital modulation, PRBS generator. The course concludes...
This paper proposes a new OFDM systems based on A Discrete Cosine Harmonic Wavelet (DCHWT), for BPSK and QPSK signals. This has been realized by proposing new separate structures for BPSK and QPSK signals. This enables to utilize the energy compaction of DCT and the computational simplicity of DCHWT for OFDM systems. The proposed OFDM systems provide improved performance in terms of BER and PAPR compared...
In today's communication scenario, high data rate single-carrier transmission may not be feasible due to too much complexity of the equalizer in the receiver. To overcome the frequency selectivity of the wideband channel experienced by single-carrier transmission, multiple carriers can be used for high rate data transmission. Orthogonal frequency division multiplexing (OFDM) , is multicarrier system...
In this work it is proposed to introduce signals and systems concepts through the first course on analog signal processing, with an integrated laboratory component. The course structure, the associated experiments, and experimental results for some experiments conducted is presented. The experiments include addition, multiplication of two signals, observing the impulse and step response of LTI systems,...
Laboratory implementation of analog and digital communication experiments is presented in this work. The electronic circuit and the observed results for experiments such as: AM, DSB-SC, SSB, PAM, natural sampling, flat top sampling, sample and hold, ASK, BPSK, FSK, QPSK, PAM-TDM, is implemented using two ICs LF 398 and LM 741 as against conventional transistor based methods. In addition all these...
The 'switching-modulator' or the 'square-law' modulator can be used for generating amplitude modulation (AM/DSB), while the 'ring-modulator' or the balanced modulator can be used to generate double-side-band-suppressed-carrier (DSB-SC) in the laboratory. For decades it has been accepted that different circuits are required for generating these two forms of AM, which differ only in the presence or...
There has been an accepted fact that the double-side-band-suppresssed-carrier (DSB-SC) waveform is always accompanied by a 'phase-reversal', whenever the message goes through zero. In this work, we demonstrate that for 'phase-reversal' to exist in the DSB-SC modulated waveform, the zero-crossing of the message has to be accompanied by the zero-crossing of the carrier. This observation though small...
Light transmission data collected around the object show large variation with source-detector separation owing to the presence of single- or multiple inhomogeneous regions in the object. This variation in the measured intensity is made use of to reconstruct regions of the inhomogeneous inclusions. The reconstructed region is found to always contain the inhomogeneity and is of size approximately 140%...
The laboratory implementation of amplitude modulation (AM) uses either the dasiaswitching-modulatorpsila or the dasiasquare-lawpsila modulator; both of which use an active device along with transformers, and have specific operating conditions. In this paper we demonstrate a new method of AM generation without using any transformers, and with an additional advantage of eliminating the difficult to...
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