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Research Paper

Enhancement channel estimation techniques for OFDM systems with realistic indoor fading channels

This paper deals with the channel estimation techniques for orthogonal frequency division multiplexing (OFDM) systems such as in IEEE 802.11. Although there has been a great amount of research in this area, characterization of typical wireless indoor environments and design of channel estimation schemes that are both robust and practical for such channel conditions have not been thoroughly investigated. It is well known that the minimum mean-square-error (MMSE) estimator provides the best mean-square-error (MSE) performance given a priori knowledge of channel statistics and operating signal-to-noise ratio (SNR). However, the channel statistics are usually unknown and the MMSE estimator has the too much computational complexity to be realized in practical systems. In this work, we propose two simple channel estimation techniques: one that is based on modifying the channel correlation matrix from the MMSE estimator and the other one with averaging window based on the LS estimates. We also study the characteristics of several realistic indoor channel models that are of potential use for wireless local area networks (LANs). The first method, namely MMSE-exponential-Rhh, does not depend heavily on the channel statistics and yet offer performance improvement compared to that of the LS estimator. The simulation results also show that the second method, namely averaging window (AW) estimator, provides the best performance at moderate SNR range.

Published by: Amrita Tiwari, Manish Jain

Author: Amrita Tiwari

Paper ID: V4I2-2185

Paper Status: published

Published: April 26, 2018

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Review Paper

Analysis of triaxiality stress behavior in three dimensional simulation of Al 2024 aluminum alloy extrusion by using finite element method

Extrusion is an extremely flexible manufacturing process, as a single press can be used to extrude various materials and a large number of profiles by simply changing the die and the associated tooling with it. Extrusion Process is highly influenced by the process parameters required for determining the quality of process and extrude. The process parameters such as billet pre-heating temperature, container temperature, die temperature, extrusion ratio, ram speed, die pre-heating temperature, the number of cavities in the die and triaxiality stresses etc. control the process, which ultimately affects the productivity and quality of the extrude. This paper deals with an extensive literature review of the effect of process parameters on the extrusion of various Al 2024 aluminum alloys.

Published by: Kamlesh Sahu, Dharmendra Tyagi

Author: Kamlesh Sahu

Paper ID: V4I2-2184

Paper Status: published

Published: April 26, 2018

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Research Paper

An experimental investigation of use of industrial waste and sewage sludge for the production of bricks

In many countries, sludge is a serious problem due to its high treatment costs and the risks to the environment and human health. The sludge presents an increasingly difficult problem to cities of all sizes because of the scarcity of suitable disposal sites, increasing labour costs, and environmental concerns. The study investigated the use of sludge incorporated with clay. In this study, bricks were produced with sewage sludge additions ranging from 10, 20, 30, 40 and 50 % by dry weight respectively and compare produce brick with regular brick. After the testing of all the brick samples for the compressive strength it comes to know that bricks made up of sludge up to 10 percent can be used for the construction of all the structures as it has the satisfactory results in the form of the hardness. Also from this investigation, we can solve disposal problem completely and also construct and economical structure with easy designing.

Published by: Ritu Daheriya, V V Singh

Author: Ritu Daheriya

Paper ID: V4I2-2179

Paper Status: published

Published: April 26, 2018

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Review Paper

A review of use of industrial waste and sewage sludge for the production of bricks

The most basic building material for construction of houses is the conventional brick. The rapid growth in today’s construction industry has obliged the civil engineers in searching for more efficient and durable alternatives far beyond the limitations of the conventional brick production. A number of studies had taken serious steps in manufacturing bricks from several of waste materials. However, the traditional mean of bricks production which has brought hazardous impacts to the context has not yet been changed or replaced by more efficient and sustainable one. This paper aims to compile this state of the artwork of manufacturing bricks in the past and the current trend in the bricks industry with respect to the raw materials, ways of manufacturing and the outcomings. Moreover, the hazardous impacts of the conventional brick manufacturing will be wholly covered as well as the attempts of the previous researchers in treating the problem properly.

Published by: Ritu Daheriya, V V Singh

Author: Ritu Daheriya

Paper ID: V4I2-2178

Paper Status: published

Published: April 26, 2018

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Research Paper

Calculation of volume flow rate required for air conditioners using software

Automation is the present trend which is going on in industries. From cleaning of dishes to preparation of latest equipment everything is prepared by automation technology. So, in this paper, we have concentrated on an important part of Air conditioning Industry which is the calculation of heat loads for a city building plan. In this paper, we have used E-Quest software by the action of which Calculation of volumetric flow required for an air conditioner along with the summer heat load is being found out easily accurately and in a precise manner. We will get accurate load calculations within the shortest time.

Published by: J. Siddhartha Yadav, N. Ravisankar, Ch. Manikanteswar Rao

Author: J. Siddhartha Yadav

Paper ID: V4I2-1879

Paper Status: published

Published: April 26, 2018

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Research Paper

Specialized data Analysis of stack overflow

This research paper analyzes and recommends a Question & Answer site for programmers, Stack Overflow, that dramatically improves on the utility and performance of Q&A systems for technical domains. It would be very difficult to analyze the real-time data collected by the users by using traditional techniques. Using a mixed methods approach that combines statistical data analysis with user interviews, we seek to understand this success. Our main focus is to develop a system that provides recommendations and statistical analysis on the basis of data of thousands of users.

Published by: Akash Tyagi, Agam Tiwari, Abhisheke, Vivek Jain

Author: Akash Tyagi

Paper ID: V4I2-1743

Paper Status: published

Published: April 26, 2018

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