Simulation of Third Generation CDMA Systems - Virginia Tech
Simulation of Third Generation CDMA Systems - Virginia Tech
Simulation of Third Generation CDMA Systems - Virginia Tech
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1.3 <strong>Third</strong> <strong>Generation</strong> Cellular <strong>Systems</strong><strong>Third</strong> generation cellular systems are being designed to support wideband serviceslike high speed Internet access, video and high quality image transmission with the samequality as the fixed networks. The primary requirements <strong>of</strong> the next generation cellularsystems are [1]:• Voice quality comparable to Public Switched Telephone Network (PSTN).• Support <strong>of</strong> high data rate. The following table shows the data rate requirement <strong>of</strong>the 3G systemsTable 1.1: 3G Data Rate RequirementsMobility NeedsVehicularOutdoor to indoor and pedestrianIndoor OfficeMinimum Data Rate144 kbps384 kbps2 Mbps• Support <strong>of</strong> both packet-switched and circuit-switched data services.• More efficient usage <strong>of</strong> the available radio spectrum• Support <strong>of</strong> a wide variety <strong>of</strong> mobile equipment• Backward Compatibility with pre-existing networks and flexible introduction <strong>of</strong>new services and technology• An adaptive radio interface suited to the highly asymmetric nature <strong>of</strong> mostInternet communications: a much greater bandwidth for the downlink than the uplink.3
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