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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Table 4.1: Performance Improvement due to Coding (Target BER=10 -3 )ChannelRequired SNR for Uncoded Required SNR for CodedSystemSystemIndoor 6.8 dB 2.1 dBVehicular A 11.5 dB 6.75<strong>of</strong> 9.6 kbps.It is evident that we get a coding gain <strong>of</strong> approximately 4.7 dB for the uplink service4.4 Summary <strong>of</strong> Results• Orthogonality among channels is preserved better at the downlink.• The system is interference limited at both the links for higher number <strong>of</strong> users.• As the system load approaches 50%, the performance for the uncoded systembecomes unacceptable.• Convolutional coding can provide with a gain <strong>of</strong> 4.7 dB for 9.6 kbps voiceservice at the uplink.69
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