DEVELOPMENT OFAPROTOTYPE DIRECTDIGITALSYNTHESIZEDQAM MODULATOR USINGCODE COMPOSER STUDIOFORAPPLICATIONIN MOBILECOMMUNICATIONSYSTEMS
Sunil Prasad · 2006
Withtheincrease inthespectral congestion and dramatic enhancement inthenumbers ofmobile telephone users, many approaches arebeing considered toreduce thebandwidth requirement of eachuser. Oneapproach istheuseofQuadrature Amplitude Modulation (QAM)formobileradio applications. QAM multilevel modulation canoffer anattractive solution tocurrent bandwidth restriction inmicrocellular networks. Theconventional method ofQAM synthesis isanalog andquite cumbersome. Inthispaperanattempt hasbeentakenforthe experimental synthesis of8-QAMusing theprinciple ofDirect Digital Synthesis (DDS)withthehelpof Digital Signal Processor (DSP)TMS320VC5416. Thesynthesized QAM signal hasbeengenerated by writing a program intheC-source file ofCode Composer Studio(CCStudio)Integrated Development Environment (IDE).Experimental results fortwosets oftri-bit modulating sequence are included.