Simulation of Third Generation CDMA Systems - Virginia Tech

Simulation of Third Generation CDMA SystemsFakhrul AlamABSTRACTThe goal for the next generation of mobile communications system is to seamlessly integratea wide variety of communication services such as high speed data, video and multimediatraffic as well as voice signals. The technology needed to tackle the challenges to make theseservices available is popularly known as the Third Generation (3G) Cellular Systems. One ofthe most promising approaches to 3G is to combine a Wideband Code Division MultipleAccess (WCDMA) air interface with the fixed network of Global System for Mobilecommunications (GSM). In this thesis a signal simulator was implemented according to thephysical layer specification of the IMT-2000 WCDMA system. The data is transmitted in aframe by frame basis through a time varying channel. The transmitted signal is corrupted bymultiple access interference which is generated in a structured way rather than treating it asAdditive White Gaussian Noise (AWGN). The signal is further corrupted by AWGN at thefront end of the receiver. Simple rake diversity combining is employed at the receiver. Weinvestigate the bit error rate at both uplink and downlink for different channel conditions.Performance improvement due to error correction coding scheme is shown. The simulatordeveloped can be an invaluable tool for investigating the design and implementation ofWCDMA systems.