M. S. Ramaiah Institute of Technology

About: M. S. Ramaiah Institute of Technology is a based out in . It is known for research contribution in the topics: Feature extraction & Photoluminescence. The organization has 2853 authors who have published 2434 publications receiving 23507 citations.

Performance improvement of QPSK modem implemented in FPGA

Abstract: This paper proposes a Quadrature Phase Shift Keying (QPSK) using two different methods. QPSK is one of the forms of Phase Shift Keying (PSK) modulation scheme. Generally a conventional QPSK modulator with Direct Digital Synthesizer (DDS) and arithmetic multiplier separates base band signal into I and Q phase which consumes low throughput with complexity in hardware implementation. Hence to generate high throughput QPSK modulator, the first proposal uses an up and down accumulator for carrier generator instead of DDS and arithmetic multiplier is modified as BOOTH multiplier. The second proposed method will produce the QPSK signal, which is based on stored QPSK phase data in ROM, which eliminates completely the DDS and multiplier blocks of the modulator.

Design of a low cost signal conditioning circuit for self-compensated non contact capacitive type multi threshold liquid level sensor

Abstract: A novel technique to design a reliable signal conditioning circuit (SCC) for self-compensating capacitive sensor meant for multi threshold liquid level measurements is presented in this paper. The non-contact type sensor for the measurement and control of liquid level is the key to avoid the corrosion of contact sensors due to chemicals and the usage of compensation system. The proposed capacitive, non-contact type sensor employs self-compensation technique whose output is of the order of Pico Farads, which is difficult to process for further control action. To overcome this, it is proposed here to design a reliable and precise signal conditioning circuit. Also, an efficient SCC is developed using Linear OPAMP. Experimental results reveal that the resolution of measurement of liquid level is improved with respect to electrode dimensions and the designed SCC converts the low capacitance output in a significant manner.

Synthesis of photocatalytic zinc oxide nanoflowers using Peltophorum pterocarpum pod extract and their characterization

Abstract: Zinc oxide nanoflowers (ZnONFs) were prepared by employing the pod extract of Peltophorum pterocarpum as a green resource and characterized by various methods. UV–vis spectrum displayed a peak at 361 nm which confirmed the formation of ZnO nanoparticles. The optical band gap was calculated as 3.43 eV. FE-SEM images exposed the flower-like morphology and EDX portrayed strong signals for Zn and O. XRD studies substantiated signature peaks for the wurtzite phase of ZnONFs and the lattice parameters matched well with the literature. Mesoporous nature was confirmed by BET analysis which yielded a high specific surface area of 19.61 m2/g. FTIR bands at 420.48 and 462.92 cm−1affirmed the Zn and O bonding vibrations. The photocatalytic potential of the ZnONFs was successfully examined for the removal of methylene blue dye under natural solar light. The experimental data were fitted to Langmuir–Hinshelwood’s first-order equation and the kinetic constant was calculated as 0.0114 min–1.

Novel Digital Image Watermarking in SWT+SVD Domain

Abstract: In this paper, Digital Watermarking is carried out in the frequency domain and the technique proposed uses single level Stationary Wavelet Transform (SWT) along with Singular Value Decomposition (SVD). SWT is used over other transformations because of its non-decimation and shift invariance property. The singular values of SWT transformed watermark image is embedded into the singularly decomposed HH sub-band (sub-image) of R, G or B channel of a Host color image. The experimental results of watermarked images shows increase in Peak Signal to Noise Ratio (PSNR) and the extracted watermark image is highly correlated with the original watermark for various types attacks.