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A telecommunication system requires anti-tapping procedure for the security purposes. One of the procedures is an embedded universal audio scrambler by using OFDM technique. The technique uses multicarrier and orthogonal frequencies in modulating data signal through IFFT/FFT process and digital mapping, PSK and QAM. OFDM simulation had been done by simulink (MATLAB) using parameters based on experiment in DSP board, TMS320C6713. The result showed that the best performance (smallest data error) was obtained by using 16QAM with 64 IFFT/FFT lengths.
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