Channel Estimation for OFDM System with Two Training Symbols Aided and Polynomial Fitting




INTRODUCTION

ORTHOGONAL frequency division multiplexing
(OFDM) is a high spectral efficiency transmission
scheme. It divides a wideband signal into many orthogonal
subcarriers and induces a symbol period that is much
longer than the bit duration. However, a long symbol
period is sensitive to the time-varying channel in wireless
communications. The channel respo ....etc

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The recent increase in the use of hard, high strength and temperature resistant materials in engineering necessitated the development of newer machining techniques. Conventional machining or finishing methods are not readily applicable to the new materials like hastalloy, nitralloy, waspalloy, nimonics, carbides, ceramics etc.


Conventional machining processes when applied to these newer materials:
1. Are uneconomical,
2. Produce poor degree of surface finish and accuracy,
3. Produce some stress,
4. Highly insufficient.

Newer machin ....etc

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Web Content Management Blueprint

By Ian Lurie
President, Portent Interactiv


The most expensive component of any website is content maintenance. Keeping your site up-to-date is essential: A web site with stale content is useless to customers, dropped by search engines, and an all-around bad investment. But fresh, timely content means constant updates, and that’s expensive. Do you hire outside designers to make simple updates, or send your own staff to training courses? Both opti ....etc

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The unconventional method of several specific advantages over conventional methods of machining and these promise formidable tasks to be undertaken and set a new recording in the manufacturing technology. EDM is one such machining process, which has been immense help to the manufacturing process engineers to produce intricate shapes on any conducting metal and alloy irrespective of its hardness and toughness.


CLASSIFICATION

1. Contact initiated discharge
2. Spark initiated discharge
3. Electrolytic discharge

ADVANTAGES

1. The pr ....etc

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In electron-beam machining (EBM), electrons are accelerated ..
In electron-beam machining (EBM), electrons are accelerated to a velocity nearly three-fourths that of light.

The process is performed in a vacuum chamber to reduce the scattering of electrons by gas molecules in the atmosphere.

The stream of electrons is directed against a precisely limited area of the workpiece;

on impact, the kinetic energy of the electrons is converted into thermal energy that melts and vaporizes the material to be removed, forming holes or cuts.
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