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RESEARCH AND IMPLEMENTATION OF QAM SIGNAL USING TEXAS INSTRUMENTS (TMS320C6713)

SYED ABDUR RAUF MAGRABI, Chatla Veeraiah

Abstract


During the last two decades the growth of digital communication and modulation techniques are widely considered in real time application in order to transfer reliable information with high data rate. Since digital modulation is resistible to noise people show interest in adopting it. Though there is various modulation techniques QAM is one of the most commonly used modulation. The QAM has higher efficiency power which results its application in mobile communication. QAM is the combination of both amplitude and phase modulation. The original 16-bit of data is modulated and sent through a channel. The noise was included and retrieved the original data through demodulation. As there is increment in mobile and telephone users, the bandwidth requirement for each user is mutually greater. Due to this there is spectral congestion caused and drastic development has been taken in the field of mobile communications. QAM multilevel modulation can offer an interesting solution to current bandwidth restriction in microcellular networks. The conventional method of QAM synthesis is analog. In this paper an attempt has been taken for the experimental synthesis of 16-Bit QAM by using principle of Direct Digital Synthesis (DDS) with the help of the Digital Signal Processor (DSP) TMS320C6713. The composite QAM signal has been generated by writing a program in the C language source file of Code Composer Studio (CCStudio) Integrated Development Environment (IDE). Exploratory results for 16-bit QAM modulating sequence are included.

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References


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DOI: https://doi.org/10.37628/jdcas.v2i2.329

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