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Design And Implementation Of An On Line Medical Billing System (A Case Study Of Penults Hospital Enugu State


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  • Literature Review Online Billing System Essay

Literature Review Online Billing System Essay

2921 Words
Nov 13th, 2012
12 Pages

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Mobile communications are rapidly becoming more and more necessary for everyday activities. With so many more users to accommodate, more efficient use of bandwidth is a priority among cellular phone system operators. Equally important is the security and reliability of these calls. One solution that has been offered is a CODE DIVISION MULTIPLE ACCESS SYSTEM.

CDMA is one method for implementing a multiple access communication

…show more content…

Network components that enable wireless data services are fundamental to the next-generation network infrastructure. Wireless data services are expected to see the same explosive growth in demand that Internet service and wireless voice services have seen in recent years.

1. What is CDMA?

Code Division Multiple Access (CDMA) is a digital cellular spread-spectrum modulation technique that implements distributed voice and data networks.
CDMA works by converting speech into digital information, which is then transmitted as a radio signal over a wireless network. CDMA does not assign a specific frequency to each user, but the full available spectrum. Each signal is encoded differently using a unique code. This way CDMA enables a large number of users to share the same frequency band at the same time, without interference.
The receiving device is instructed to use the code to extract the data out of the received signal.


2.1 History
The first generation of cellular systems, which include the AMPS (Advanced Mobile Phone Systems), was introduced in the early 1980s. These systems used analog frequency modulation (FM) and have a frequency division multiple access (FDMA) based media access control (MAC) architecture.
Within a few years, market demands and capacity requirements

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