Author: Dong-Hahk Lee Anna Choi Jun-Mo Koo Jin-Ick Lee Byung Moo Kim
Central Res. & Dev. Lab., SK Telecom, Sungnam City, South Korea;


Abstract:

This paper presents the design, implementation and test results of a complete wideband CDMA modem with a modulator and a demodulator for use in next-generation mobile stations. The modem is based on NTT DoCoMo's proposal for the next generation W-CDMA air interface. The modulator supports multicode transmission capability, which enables three dedicated physical channels to be t ....etc

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sms based wireless electronic notice board ....etc

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BackGround
A CDMA (Code Division Multiple Access) based communication system allows the users to share an available frequency spectrum. The users are allocated different codes that are recognizable for the preferred receivers. This solution has several advantages, among other it gives increased robustness to interference. The CDMA project will investigate the benefits and losses of using CDMA communication system on an acoustic channel between two computers. The focus of the project will be to study how a higher data rate will affect ....etc

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DS-CDMA in Wireless Handset Communication Using MATLAB.
code
....etc

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SMS Based Wireless Electronic Notice Board using GSM/CDMA/3G Mobile Phone
ABSTRACT
Notice Board is primary thing in any institution / organization or public utility places like bus stations, railway stations and parks. But sticking various notices day-to-day is a difficult process. A separate person is required to take care of this notices display. This project deals about an advanced hi-tech wireless notice board.
The project is built around the ATMEGA8L micro controller from Atmel. This micro ....etc

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please send me circuit diagram of sms based wireless electronic notice board using gsm cdma 3g mobile phone
please send me circuit diagram of sms based wireless electronic notice board using gsm cdma 3g mobile phone information ....etc

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CDMA Mobile Communication & IS-95
 Most of the slides are stolen from Prof. Abhay Karandikar’s lecture
 Spread Spectrum Priniciples
 Does not attempt to allocate disjoint frequency or time slot resources
– Instead, this approach allocates all resources to simultaneous users, controlling the power transmitted by each user to the minimum required to maintain a given SNR
 Each user employs a noise-like wideband signal occupying the entire frequency allocation
 Each user contributes to the back ....etc

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CDMA Communication System ....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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1. INTRODUCTION
As more and more attention is paid to the ocean, the requirement of exploration and exploitation to it grows increasingly. In order to realize some tasks in the ocean such as collection of the information, monitoring of the environment, exploration of energy sources, forecast of natural disaster, assistant navigation, underwater communication technique has become a very important scientific research field. Because acoustic wave is adopted to actualize communication in the water instead of electromagne ....etc

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