CDMA Control Channel Traffic Analyzer

by Russell Ryan, Zackary Anderson



We propose to build a system that will use software radio to inspect reverse control channel traffic of a cellular CDMA system. The system will communicate serially to an RF front-end called the USRP. The USRP will relay the appropriate CDMA control channel, and then the FPGA will process the data to discover current calls on the network. The proposed system will demodulate and filter the signal, automatically discover the pseudonoise sequence and Walsh code unique to a particular call, perform error correction with a Viterbi filter, and then relay the processed data to a computer for reporting back to a user. Since carrier-specific implementation details are difficult to obtain, the system may be tested with sample CDMA data generated using Matlab.


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