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Title: Spread spectrum image watermarking with digital design
Page Link: Spread spectrum image watermarking with digital design -
Posted By: seminar class
Created at: Saturday 26th of March 2011 06:51:30 PM
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1. Abstract
In recent time watermarking technique becomes a potential solution for copyright protection, authentication and integrity verification of digital media. Among the widely used watermarking techniques, spread spectrum modulation based method becomes appealing due to its inherent advantage of greater robustness and is used widely for various applications. Some watermarking applications, for example, digital television broadcasting, internet protocol television (IP-TV), etc. essentially demand development of ....etc
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Title: Introduction to cdma2000 Standards for Spread Spectrum Systems
Page Link: Introduction to cdma2000 Standards for Spread Spectrum Systems -
Posted By: computer girl
Created at: Tuesday 12th of June 2012 02:54:50 PM
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Introduction to cdma2000 Standards for Spread
Spectrum Systems
OVERVIEW
The cdma2000 Family of Standards
The cdma2000 family of standards includes core air interface, minimum performance, and
service standards (see 1.3). The cdma2000 air interface standards specify a spread
spectrum radio interface that uses Code Division Multiple Access (CDMA) technology to
meet the requirements for Third Generation (3G) wireless communication systems. The
core air interface standards in the family are [ ....etc
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Title: MSK Direct Sequence Spread Spectrum System Incorporating SAW Tapped Delay Line
Page Link: MSK Direct Sequence Spread Spectrum System Incorporating SAW Tapped Delay Line -
Posted By: seminar class
Created at: Thursday 05th of May 2011 01:14:18 PM
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MSK Direct Sequence Spread Spectrum System Incorporating SAW Tapped Delay Line and SAW Shaping Filter
Abstract
The present work deals with theIF section of an indoor wireless TDMA/CDMA(TCDMA) communication system operating inthe 2.45 GHz ISM band . Spreading anddespreading is done at the 361 MHz IF withan extremely wide bandwidth of 65 MHz whichis greater than the coherence bandwidth of theUHF indoor radio channel. For the modulationof the data we employ on o_ keying (OOK), andfor the spreading minimum shift keying (MSK).Two ty ....etc
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Title: Direct Sequence Spread Spectrum DSSS Modem Reference Design
Page Link: Direct Sequence Spread Spectrum DSSS Modem Reference Design -
Posted By: seminar class
Created at: Tuesday 03rd of May 2011 04:52:53 PM
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Much of the signal processing performed in modern wireless
communications systems—such as digital modulator/demodulator
applications—takes place in the digital domain and requires high
throughput. Dedicated hardware can provide the processing capability to
meet this requirement. The parallel processing capability of Altera®
programmable logic devices (PLDs) makes them ideal for
baseband/intermediate frequency (IF) digital signal processing
applications.
The direct sequence spread spectrum (DSSS) digital modem reference
design is ....etc
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Title: Spread Spectrum
Page Link: Spread Spectrum -
Posted By: electronics seminars
Created at: Tuesday 22nd of December 2009 05:52:34 PM
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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: spread spectrum multiple access full report
Page Link: spread spectrum multiple access full report -
Posted By: project report tiger
Created at: Tuesday 02nd of February 2010 12:39:29 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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Title: Spread-spectrum communications technology
Page Link: Spread-spectrum communications technology -
Posted By: seminar class
Created at: Monday 21st of March 2011 11:48:02 AM
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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: 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 07:03:43 PM
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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: Generation of PN Sequences for Spread Spectrum Application
Page Link: Generation of PN Sequences for Spread Spectrum Application -
Posted By: seminar class
Created at: Saturday 09th of April 2011 01:21:47 PM
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PRESENTED BY:
S ADITYA THIMMA REDDY
PUSHPAVALLI R
P VENKATA KRISHNA TEJA
S PENNA OBULAMMA
Abstract
Spread-spectrum telecommunications is a signal structuring technique that employs direct sequence, frequency hopping, or a hybrid of these, which can be used for multiple access and/or multiple functions. This technique decreases the potential interference to other receivers while achieving privacy. Frequency-hopping spread spectrum (FHSS), direct-sequence spread spectrum (DSSS ....etc
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Title: Image Watermarking Using Spread Spectrum Technique in Log-2-Spatio Domain
Page Link: Image Watermarking Using Spread Spectrum Technique in Log-2-Spatio Domain -
Posted By: seminar class
Created at: Thursday 05th of May 2011 02:25:33 PM
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Abstract
In this paper, we propose to embed the watermark
information in the log-2-spatio domain by means of
spread spectrum technique. In log-2-spatio domain,
the variance of the information is reduced
significantly. This improves the efficiency and
robustness of spread spectrum technique. Low
intensity and mid-band regions are selected to embed
the information in order to guarantee an invisible
watermark as well as the robustness to JPEG
compression. Simulation results show that the
embedded information still survive up to ....etc
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