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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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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ppt of wireless video servicess in cdms system ....etc

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The Internet and Mobile Wireless are the defining technologies of our times. Today, they are converging and promising to dramatically reshape society. Mobile Internet services will help people work, entertain, and communicate anytime, anywhere-using a variety of devices such as cell phones, Personal Digital Assistants (PDAs), and laptops. Driven by the Wireless Internet?s enormous potential and reacting to declining Mobile voice revenues per subscriber, operators are pegging their future growth on Wireless Internet services.

While operators ....etc

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MTNL services

Basic landline services
Dolphin mobile services
Garuda mobile sevices
Jadoo mobile services
Broadband services

Difference b/w CDMA & GSM

CDMA stands code division multiple access
Both data & voice are separated from signal s using codes and then transmitted using wide frequency range.
in CDMA more space is left in channel for data transfer.
14%of worldwide market goes to CDMA
In CDMA all user share same 1250 kHz wide carrier.

In CDMA has dig ....etc

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HI Sir
PLEASE ANY ONE UPLOAD FULL REPORT OF APPLYING CDMA TECHNIQUE TO NETWORK-ON-CHIP HELP ME OUT AS SOON AS POSSIBLE .. I WILL BE VERY THANK FULL TO YOU.....FULL REPORT.PLZ....PLZ MAIL ME IF U CAN TO [email protected] ....etc

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MOBILE COMMUNICATION 3G CDMA


ABSTRACT

Cellular technology
Developed by Quamcomm
Originally known as IS-95
Competes with GSM
CDMAONE,CDMA2000
Variants 1XEV,1XEV-DO,MC3X

INTRODUCTION

What is CDMA
Multiple Access Comparison
FDMA - Frequency Division Multiple Access
TDMA - Time Division Multiple Access
CDMA - Code Division Multiple Access

BENEFITS Of CDMA
Cdma capacity increases
Improved call quality
Simplified system planning
Enhanced priva ....etc

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Multiple access (MA) schemes are used to simultaneously share available bandwidth in communication systems. In conventional MA applications a finite and contiguous amount of spectrum which is designated for a particular service is allocated to multiple users. Therefore, the use of designated radio spectrum is unconstrained and can be utilized in many ways to achieve maximum efficiency. Time division multiple access (TDMA), frequency division multiple access (FDMA), and code division multiple access (CDMA) are the three major MA techniques. In r ....etc

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The world is demanding more from wireless communication technologies than ever before. More people around the world are subscribing to wireless services and consumers are using their phones more frequently. Exciting Third-Generation (3G) wireless data services and applications - such as wireless email, web,digital picture taking/sending and assisted-GPS position location applications - and wireless networks have also arrived and asked to do much more than just a few years ago. This is where CDMA technology fits in. CDMA consistently provides be ....etc

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