Data Transmission at 12kb/s over 32kb/s ADPCM
Keywords:
QAM modem, 32kb/s ADPCM.Abstract
This paper presents new modified QAM modem
that operates at data rate of 12kb/s to be transmitted over 32kb/s Adaptive Differential Pulse Code Modulation (ADPCM). The purpose of this modified QAM modem is to reduce the nonlinear distortion introduced by ADPCM. The performance of ADPCM is studied considering the standard QAM modem and modified QAM modem with different constellations. The simulation results show that the performance of ADPCM with modified QAM modem is better than its performance with standard QAM modem. Also, the performance with circular constellation is better than rectangular one.
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