Hardware Implementation of a 16-QAM Modem Using Waveform Switching Technique

  • K.P.M. Bhat Electronics & Radar Development Establishment, Bangalore
  • Reena P. Nibandhe Defence Institute of Advanced Technology, Pune
  • Kathika Roy Defence Institute of Advanced Technology, Pune
DOI: https://doi.org/10.14429/dsj.56.1950
Keywords: 16-QAM, 8-PSK modulation, waveform mapping, programmable gain amplifier, digital phase detector

Abstract

A new modem circuit technique is proposed for multilevel signal transmission to utilise
the transmission bandwidth efficiently in bandwidth-constrained voice-band channels. Using
this technique, a 16-level quadrature amplitude modulated (16-QAM ) signal is generated as a
cascaded configuration of an 8-level phase-shift keying (8-PSK) and a 4-level amplitude-shift
keying ( 4-ASK) using waveform mapping rules. The data detection procedure, which is based
on the determination of each symbol one-by-one by inspection of their amplitude level and
absolute phase information, is described.
Published
2006-11-01
How to Cite
Bhat, K., Nibandhe, R., & Roy, K. (2006). Hardware Implementation of a 16-QAM Modem Using Waveform Switching Technique. Defence Science Journal, 56(5), 815-824. https://doi.org/10.14429/dsj.56.1950
Issue
Vol 56 No 5
Section
Electronics & Communication Systems
Copyright (c) 2016 Defence Science Journal

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