Analysis of Modern Digital Modulation Techniques.

Abstract

Offset Quadriphase Shift Keyed (OQPSK) modulation, Minimum Shift Keyed (MSK) modulation and Sinusoidal Frequency Shift Keyed (SFSK) modulation are analyzed and compared within this report. First, OQPSK, MSK and SFSK are examined both graphically and mathematically, and compared to the fundamental modulation techniques of FSK, PSK and QPSK. Second, a common mathematical framework unifying the three modulation techniques is developed. Third, the theoretical spectral properties of each are calculated. The spectral properties include the autocorrelation function, power spectral density, spectral occupancy, spectral shape and roll off characteristics. Next, the practical spectral properties of the three modulation techniques are developed using a realistic bandlimited, nonlinear channel. Finally, simulated and measured performance of OQPSK and MSK are given and compared using probability of error as the figure of merit. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 15, 1978
Accession Number
ADA064363

Entities

People

  • Joseph L. Craddock

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Bandwidth
  • Carrier Waves
  • Communication Systems
  • Computer Simulations
  • Data Rate
  • Digital Data
  • Electrical Engineering
  • Engineering
  • Frequency Bands
  • Frequency Shift
  • Intersymbol Interference
  • Mathematical Models
  • Modulation
  • Modulators
  • Phase Transformations
  • Power Spectra

Readers

  • Approximation Theory.
  • Radio communications and signal processing.