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Abstract Code Division Multiple Access CDMA is the ultimate in inside communications technology It is fastest growing wireless technology CDMA already has tens of millions of users throughout the world The reasons for this are simple CDMA supports current voice and data needs while providing a quick cost-efficient evolutionary path to tomorrows systems CDMA has greater voice quality and call clarity than other technologies because it filters out background noise cross-talk and interference CDMA has fewer dropped calls because it increases voice and date transmission reliability CDMA has greater spectral efficiency because it packs more transmissions into the same space resulting in fewer cell sites which lowers operators costs It also has increased capacity enhanced privacy and improved coverage Since the first cellular mobile telephone networks opened for business in the early 1980s growth in numbers of subscribers has consistently exceeded even the most optimistic forecasts Even in the most advanced markets this growth shows little sign of abating and meanwhile new markets are accelerating rapidly Cellular phone technology was developed by ATT American Telephone and Telegraph in its Bell laboratories Cells are linked to a mobile communications telephone exchange which in turn communicates with other cells other networks or the national and international telephone systems These exchanges are central to the operation of a mobile telephone network The first mobile cellular network operators in the UK Cellnet and Vodaphone began using analogue technology for their first networks because it was the only available and prevailing technology of that time Analogue technology is based upon the transmission of sound by way of radio waves through an Analogue Mobile Phone System AMPS and conforms to the relevant Total Access Communication System TACS standards of operation in countries such as Italy Spain Austria and Eire Unfortunately analogue networks are limited in that they suffer from severe capacity constraints There are reception and interference problems they are also less secure to prying ears
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