Performance Analysis, Characteristics, and Simulation of Digital QAM



Abstract Views
699

Downloads
1439

Citations

Share

##plugins.themes.bootstrap3.article.sidebar##

10.24018/ejece.2017.1.1.3

Abstract viewed = 699 times

Table of Contents

##plugins.themes.bootstrap3.article.main##

Quadrature Amplitude Modulation or QAM is a form of modulation which is widely used for modulating data signals onto a carrier used for radio communications. QAM, when used for digital transmission for radio communications applications is able to carry higher data rates than ordinary amplitude modulated schemes and phase modulated schemes. This paper presents the various fields where QAM can be implemented, describes modulator/demodulator block diagrams for transmitters as well as receivers, provides an introduction of certain performance indicators of modulation and a list of applications using alternative implementations of QAM. Also the paper presents a simulation of QAM using Simulink (example of 16-QAM signal) with signal trajectors and constellation plots. It is compared the theoretical and simulated Bit Error Rate (BER) for 16-QAM with Gray coding in an AWGN channel. Some general conclusions are also cited.
Keywords: Quadrature Amplitude Modulation (QAM) Constellation diagram Modulator/Demodulator Simulation Bit error rate (BER) Signal to noise ratio (SNR).

Downloads

Download data is not yet available.

References

  1. J. G. Proakis, Digital Communications, New York, NY, McGraw-Hill, 2001.
     Google Scholar
  2. B. Sklar, Digital Communications - Fundamentals and Applications, Prentice Hall, New Jersey, 2001.
     Google Scholar
  3. D. Silage, Digital Communications Systems using Matlab and Simulink, , Bookstand Publishing, 2009.
     Google Scholar
  4. W. T. Webb and L. Hanzo, Modern Quadrature Amplitude Modulation, New York, IEEE Press, 1994.
     Google Scholar
  5. Schindler P. C. et al. “Monolithic GaAs electro-optic IQ modulator demonstrated at 150 Gbit/s with 64QAM.” J. Lightwave Technol. 32, 760–765, 2014.
     Google Scholar
  6. Chiba A. et al. “16-level QAM by monolithic quad-parallel Mach-Zehnder optical modualator”, Elctron. Lett. 46, 220–221, 2010.
     Google Scholar