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William Stallings Data and Computer Communications 7th Edition



Frequency Domain Concepts

Signal usually made up of many frequencies

Components are sine waves

Can be shown (Fourier analysis) that any signal is made up of component sine waves

Can plot frequency domain functions

Spectrum & Bandwidth

.Spectrum
range of frequencies contained in signal
.Absolute bandwidth
width of spectrum
.Effective bandwidth
Often just bandwidth
Narrow band of f ....etc

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To get full information or details of quality of services in ad hoc wireless networks please have a look on the pages

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http://seminarsprojects.net/Thread-Adaptive-Quality-of-Service-for-Wireless-Ad-hoc-Networks?pid=93910#pid93910

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REAL TIME PERSONALIZED COMMERCIAL SERVICES USING DATA WAREHOUSING AND RFID TECHNOLOGY.

ABSTRACT: In this work, we present a system architecture based on a data warehouse coupled with Data Mining functionality, which, by mean of the RFID technology, is capable of sending personalized offers to customers in the area of interest in real-time. The offer personalization process is performed by mean of a clustering technique based on a fuzzy extension of the SQL language. ....etc

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To get full information or details of wireless security for personalised and mobile healthcare services ppt please have a look on the pages

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Presented By:
Al-Sakib Khan Pathan1, Humayun Kadir Islam2, Sabit Anjum Sayeed3, Farruk Ahmed2, Choong Seon Hong1
Abstract-
In recent years, the proliferation of mobile computing devices has driven a revolutionary change in the computing world. The nature of ubiquitous devices makes wireless networks the easiest solution for their interconnection. This has led to the rapid growth of several wireless systems like wireless ad hoc networks, wireless sensor networks etc. In this paper we have proposed a framework for rural development b ....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 digital transfer r ....etc

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Summary
The vision of Intelligent Wireless Web (IWW) goes beyond just connecting mobile devices to the Internet. It includes the creation of a pervasive, user centred mobile environment, which has the ability to provide highly specific data and services to users on asneeded basis, by intelligent interpretation of the user context. IWW services could provide mobile tourists highly precise data and services on an as-needed basis, with flexibility of use for the user. With the emergence of high-speed wireless networks, such as Wi-Fi, Bluetooth a ....etc

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