Abstract This paper provides an asymptotic analysis of the transmission delay experienced by SUs for dynamic spectrum access (DSA) networks. It is shown that DSA induces only light-tailed delay if both the busy time of PU channels and the message size of SUs are light tailed. On the contrary, if either the busy time or the message size is heavy tailed, then the SUs' transmission delay is heavy tailed. For this latter case, it is proven that if one of either the busy time or the message size is light tailed and the other is regularly varying wi ....etc

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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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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 and is vitally impor ....etc

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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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to get information about the topic minium distance packet forwarding for serch applications in manet full report ,ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-mdpf-minimum-distance-packet-forwarding-for-search-applications-in-mobile-ad-hoc-net ....etc

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At the most basic level, the spectrum analyzer can be described as a frequency-selective, peak-responding voltmeter calibrated to display the rms value of a sine wave. It is important to understand that the spectrum analyzer is not a power meter, even though it can be used to display power directly. As long as w know some value of a sine wav ( for example, peak or average) and know the resistance across which w measure this value, we can calibrate our voltmeter to indicate power. With the advent of digital technology, modern spectrum analyzers ....etc

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please let me knw abt this ppt it is needed for seminar presentation ....etc

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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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The traditional approach to managing radio
frequency (RF) spectrum concludes with a spectrum
management administration identifying how a band of spectrum
may be used in a region it administers and who may use it. This
approach to spectrum management is encumbered with political
process that is challenged to keep pace with the rapid advances in
technologies that exploit RF spectrum. Recognizing that this
process can stifle innovation, the FCC has proposed new
spectrum management models and the use of a measure of
interference temperatur ....etc

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Sir,
I need matlab code for spectrum sensing in cognitive radios using energy detection techinque
With Regards,
Vineetha ....etc

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