Mepco Schlenk Engineering College

About: Mepco Schlenk Engineering College is a based out in . It is known for research contribution in the topics: Wavelet & Wavelet transform. The organization has 1307 authors who have published 1665 publications receiving 18690 citations.

Design of optimum physical layer architecture for a high data rate LTE uplink transceiver

Abstract: The Third Generation Partnership Project (3GPP) provides the Long Term Evolution (LTE) standards for the fourth generation (4G) wireless communication systems. Single Carrier Frequency Division Multiple Access (SC-FDMA) and Orthogonal Division Multiple Access (OFDMA) are the two major techniques used in LTE. The main drawback of OFDMA over SC-FDMA is its high peak to average power ratio (PAPR). Hence OFDMA is used in the downlink of the fourth generation (4G) wireless communication systems for its high spectral efficiency and high PAPR. SC-FDMA is used in the uplink of the fourth generation (4G) wireless communication systems since it is more power efficient. The main objective of this paper is to design optimum physical layer architecture of a high data rate LTE uplink transceiver using SC-FDMA multiple access scheme with error correction mechanism using Low dense parity check codes (LDPC) to provide lesser Bit Error Rate (BER) and avoiding packet loss by Interleaving. The optimum physical layer architecture for the fourth generation (4G) wireless communication systems is chosen by comparing the LDPC coded SC-FDMA with the LDPC coded OFDMA. The chosen architecture must be more power efficient and support high data rates, which is the main prerequisite for the mobile user.

Combined PAPR reduction and frequency offset estimation using precoded Zadoff-Chu OFDM in WLAN system

Abstract: The main objective of this paper is to implement a precoded Zadoff-Chu OFDM to reduce the Peak to Average Power Ratio (PAPR) and for frequency offset estimation in Wireless Local Area Networks High PAPR and Carrier Frequency Offset are major disadvantages to the Orthogonal Frequency Division Multiplexing (OFDM) systems and can significantly degrade the power efficiency at the transmitter and performance of the system respectively From the simulation results in MATLAB, it can be proved that using this method a PAPR of 25dB less than that of PTS technique can be achieved and the range of frequency estimation of N/2 subcarrier spacing can be obtained

Gabor wavelet based blood vessel segmentation in retinal images using kernel classifiers

Abstract: The retina is an important field in the medical treatment of pathologies. Segmentation of the vasculature in retinal fundus images plays an important role in the diagnosis of many eye diseases such as hypertension, arteriosclerosis and blindness caused by diabetes. Comparison of kernel classifiers for the vessel segmentation is presented in this work. Kernel based classifier such as Support Vector Machine and Relevance Vector Machine is used to segment the vessels by classifying each pixel as vessel or nonvessel, based on the pixel's feature vector. The feature vectors are composed of the pixel's intensity and the Gabor wavelet responses measured at different scales. The method's performance is evaluated on publicly available databases of color fundus images with reference to the ground truth image provided in the database. The performance of the Segmentation is analyzed in terms of Specificity, Sensitivity and Segmentation Accuracy.

Exterior beam-column joint study with non-conventional reinforcement detailing using mechanical anchorage under reversal loading

Abstract: Reinforced concrete structures beam-column joints are the most critical regions in seismic prone areas. Proper reinforcement anchorage is essential to enhance the performance of the joints. An attempt has been made to appraise the performance of the anchorages and joints. The anchorages are detailed as per ACI-352 (mechanical anchorages), ACI-318 (conventional bent hooks) and IS-456 (conventional full anchorage). The joints are detailed without confinement in group-I and with additional X-cross bar in group-II. To assess the seismic performance, the specimens are assembled into two groups of three specimens each and were tested under reversal loading, The specimen with T-type mechanical anchorage (Headed bar) and T-type mechanical anchorage combination with X-cross bar exhibited significant improvement in seismic performance: load-displacement capacity, displacement ductility, stiffness degradation, controlled crack capacity in the joint shear panel and also reduced congestion of reinforcement in joint core.

Influence of calcination temperature on sol–gel synthesized single-phase bismuth titanate for high dielectric capacitor applications

Abstract: An inexpensive sol–gel combustion method using citric acid as fuel has been used to synthesize bismuth titanate, Bi4Ti3O12 nanopowders. Thermogravimetric analysis proved that a calcination temperature of 900 °C is sufficient for the preparation of single-phase bismuth titanate. X-ray diffraction and Fourier transform infrared spectroscopy are used to examine the influence of calcination temperature on the structural growth of the Bi4Ti3O12 nanopowder. The average crystallite size estimated by using the Scherrer method and the Williamson–Hall method was found to increase with calcination temperature. Photoluminescence behavior as a function of calcination temperature was observed at two different excitation wavelengths of 300 nm and 420 nm. The morphology of the particles analyzed using images obtained from field emission scanning electron microscopy displayed irregular, random sized, and spherical-shaped structures. The stoichiometry and purity of the nanopowder are confirmed by energy-dispersive...