Monday, February 18, 2008

Introduction to CDMA


Cellular networks are wireless WANs that establish a connections between cellular users. The cellular network is comprised of many "cells". The users communicate within a cell through wireless communications. A Base Transceiver Station (BTS) is used by the mobile units in each cell by using wireless communications. One BTS is assigned to each cell. Regular cable communication channels can be used to connect the BTSs to the Mobile Switching Center (MSC). The MSC determines the destination of the call received from a BTS and routes it to a proper destination either by sending it to another BTS or to a regular telephone network. Keep in mind that the communications is wireless within a cell only.
The words "code" and "division" are important parts of how CDMA works. CDMA uses codes to convert between analog voice signals and digital signals. CDMA also uses codes to separate (or divide) voice and control data into data streams called "channels." These digital data stream channels should not be confused with frequency channels.


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