Introduction of CDMA TECHNOLOGY


ABSTRACT

Code-Division Multiple Access, a digital cellular technology that
uses spread-spectrum techniques. Unlike competing systems, such
as GSM, that use TDMA, CDMA does not assign a specific frequency
to each user. Instead, every channel uses the full available spectrum.
Individual conversations are encoded with a pseudo-random digital
sequence.
As the term implies, CDMA is a form of multiplexing which allows
numerous signals to occupy a single transmission chann ....etc

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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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CDMA technology


INTRODUCTION :-

Code division multiple access (CDMA) is a channel access method used by various radio communication technologies. CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code) to allow multiple users to be multiplexed over the same physical channel. By contrast, time division multiple access (TDMA) divides access by time, while frequency-division multiple access (FDMA) divid ....etc

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CDMA Technology

Abstract :

CDMA was developed by QUALCOMM Incorporated, a company in San Diego, California. QUALCOMM engineers decided to do something different and applied spread spectrum techniques to a multiple access system, which ultimately became CDMA.
In spread spectrum, instead of giving each person a channel, or each group of 3 or 8 people a time slot, CDMA puts everyone in the same channel at the same time.
At first thought, it would seem to be an impossible task to make work, but it does work. The reason it works is expla ....etc

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looking for advantages and disadvantages of cdma technology pdf ? ....etc

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CDMA TECHNOLOGY



INTRODUCTION

We are moving into a new era of communications and information technology. Personal competitiveness in business in relies more and more on increase personal productivity and responsiveness. Today everybody is on the move and mobile is the only way to keep contact with that person. But now a days peoples want multimedia facilities from their mobile handset. But it requires high data rate, hi efficiency and many ....etc

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Overview
Code division multiple access (CDMA) is a modulation and multiple-access scheme based on spread-spectrum communication. In this scheme, multiple users share the same frequency band at the same time, by spreading the spectrum of their transmitted signals, so that each user's signal is pseudo-orthogonal to the signals of the other users.

CDMA Signals
In a CDMA system, each signal consists of a different pseudorandom binary sequence (called the spreading code) that modulates a carrier, spreading the spectrum of the waveform. A large ....etc

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MOBILE COMMUNICATIONS
(IMPLEMENTATION OF CDMA TECHNOLOGY IN CELLULAR
PHONES)
Presented By:
M.Vamsi Krishna
B.kiran sai phaneswar


ABSTRACT:

A wireless digital communication system is a technique that allows people to communicate each other at a distance. In this paper we tried to explain one of the latest technologies of digital wire less communication systems - The CDMA and the application of this on cellular phones.CDMA is an acronym for code division multiple ....etc

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USB EXPLAINED: AN INTRODUCTION TO USB AND ITS FUTURE


USB HISTORY
The Universal Serial Bus (USB) was introduced to the world of PC computing to solve the growing problem of how
to connect peripherals to a PC. The world of desktop computers needed a way, not only to physically connect
devices, but also allow them to be identified and categorized to enable a simple ease of use and method of discovery.
Prior to USB, many people overloaded the use of their serial and ....etc

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