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Title: Spread Spectrum
Page Link: Spread Spectrum -
Posted By: electronics seminars
Created at: Tuesday 22nd of December 2009 03:52:34 AM
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Abstract:
Spread spectrum is a form of wireless communications in which the frequency of the transmitted signal is deliberately varied. This result in a much greater bandwidth than the signal would have if its frequency were not varied.A conventional wireless signal has a frequency, and are methods by which electromagnetic energy generated in a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth usually specified in megahertz (MHz) or gigahertz gigahertz), that doe ....etc

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Title: Electromagnetic Interference EMI Electromagnetic Compatibility EMC
Page Link: Electromagnetic Interference EMI Electromagnetic Compatibility EMC -
Posted By: computer science crazy
Created at: Friday 17th of April 2009 08:10:42 AM
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Electromagnetic Interference (EMI) & Electromagnetic Compatibility (EMC)

INTRODUCTION

¢ EMI-

It consists of any unwanted conducted or radiated signals of electric origin that can cause degradation in system or equipment performance.

¢ EMC-

It is the ability of the system to function as designed without any degradation in performance due to EMI with in the operational environment


Classification of EMI

¢ INTRASYSTEM EMI-

EMI problems with in the system one is dealing with.

¢ INTERSYSTEM EMI-

EMI problem ....etc

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Title: Implementation Issues in Spectrum Sensing for Cognitive Radios
Page Link: Implementation Issues in Spectrum Sensing for Cognitive Radios -
Posted By: seminar surveyer
Created at: Wednesday 20th of October 2010 06:39:59 AM
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Abstract
There are new system implementation challenges involved in the design of cognitive radios, which have both the ability to sense the spectral environment and the flexibility to adapt transmission parameters to maximize system capacity while co-existing with legacy wireless networks. The critical design problem is the need to process multi-gigahertz wide bandwidth and reliably detect presence of primary users. This places severe requirements on sensitivity, linearity, and dynamic range of the circuitry in the RF front-en ....etc

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Title: Digital Invisible Ink Data Hiding Based on Spread-Spectrum
Page Link: Digital Invisible Ink Data Hiding Based on Spread-Spectrum -
Posted By: seminar class
Created at: Tuesday 15th of March 2011 06:03:43 AM
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ABSTRACT

A novel data-hiding methodology, denoted as digital invisible ink (DII), is proposed to implement secure steganography systems. Like the real-world invisible ink, secret messages will be correctly revealed only after the marked works undergo certain prenegotiated manipulations, such as lossy compression and processing. Different from conventional data-hiding schemes where content processing or compression operations are undesirable, distortions caused by prenegotiated manipulations in DII-based schemes are indispensable steps for ....etc

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Title: Spread-spectrum communications technology
Page Link: Spread-spectrum communications technology -
Posted By: seminar class
Created at: Sunday 20th of March 2011 10:48:02 PM
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1.1WHAT IS SPREAD SPECTRUM?
Spread-spectrum techniques are methods by which a signal (e.g. an electrical,electromagnetic, or acoustic signal) generated in a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. These techniques are used for a variety of reasons, including the establishment of securecommunications, increasing resistance to natural interference and jamming, topreventdetection, and to limit power flux density (e.g. in satellite downlinks).
S ....etc

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Title: A PIPELINE FAST FOURIER TRANSFORM FOR DIGITAL SPECTRUM ANALYSIS
Page Link: A PIPELINE FAST FOURIER TRANSFORM FOR DIGITAL SPECTRUM ANALYSIS -
Posted By: computer science crazy
Created at: Thursday 17th of September 2009 11:25:22 AM
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A PIPELINE FAST FOURIER TRANSFORM FOR DIGITAL SPECTRUM ANALYSIS

Abstract:- This paper describes a novel structure for a hardwired fast Fourier transform (FFT) signal processor that promises to permit digital spectrum analysis to achieve throughput rates consistent with extremely wide-band radars. The technique is based on the use of serial storage for data and intermediate results and multiple arithmetic units each of which carries out a sparse Fourier transform. Details of the system are described for data sample sizes that are binary multi ....etc

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Title: Indian Telecom Scene- CDMA-vs-GSM or Spectrum technology
Page Link: Indian Telecom Scene- CDMA-vs-GSM or Spectrum technology -
Posted By: project report helper
Created at: Saturday 25th of September 2010 05:24:46 AM
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Indian Telecom Scene- CDMA-vs-GSM or Spectrum technology

presented by:
b.b anand
president
Reliance Infocomm Ltd.
Vijaya Building, 13th Floor,17, Barakhamba Road,
New Delhi



Indian telecoms at current value

-India – a dynamic & vibrant economy - about 7 to 8 % GDP growth
-Tele density : Risen from less than 2% in 2000 to 8.80 %by Jan’2005
-Total subscribers base in India 94.92 million by the end of Jan’05.
-Wireless subscribers at the end of Jan’05 is ....etc

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Title: Grouping Technique for Cooperative Spectrum Sensing in Cognitive Radios
Page Link: Grouping Technique for Cooperative Spectrum Sensing in Cognitive Radios -
Posted By: project report helper
Created at: Friday 22nd of October 2010 07:00:30 AM
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Grouping Technique for Cooperative Spectrum Sensing in Cognitive Radios




Rizwan Akhtar, Adnan Rashdi and Abdul Ghafoor
Electrical Engineering Department, College of Signals, National University of Science & Technology, Pakistan


Abstract—

Cognitive networks can potentially solve the
problems of spectrum scarcity by accommodating unlicensed
(secondary) users in under-utilized segments of the spectrum.
Spectrum sensing serves as the primary stimulus for a cognitive
radio an ....etc

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Title: Zoom-FFT Spectrum Analyzer full report
Page Link: Zoom-FFT Spectrum Analyzer full report -
Posted By: seminar presentation
Created at: Tuesday 18th of May 2010 10:51:07 AM
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Zoom-FFT Spectrum Analyzer
Presented By:
Ling Feng
s020983
Jinxu Huang
s021102

1. Introduction
Nowadays we contact with various signals everyday. We need to analysis and utilize these signals. In many situations there ....etc

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Title: spread spectrum multiple access full report
Page Link: spread spectrum multiple access full report -
Posted By: project report tiger
Created at: Monday 01st of February 2010 10:39:29 PM
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1. INTRODUCTION
Code Division Spread Spectrum is one form of CDMA communication technique optimized for the cost conscious, high volume and short cycle consumer electronics market. Its primary application is in digital cordless telephony today. Meanwhile, it is being applied to wireless devices for the last 100-meter connection to the Internet, and in the wireless local loop to provide sub-$20 handset cost, tariff free mobile voice services in some third world countries.
Why is CD/SS technology suitable for consumer e ....etc

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