Generating and Demodulating M-ary FSK-PSK Using the FFT.

Abstract

This paper discusses a technique for modulating and demodulating M-ary FSK using an FFT based modem typical of Coded Orthogonal Frequency Division Modulation (COFDM) systems. COFDM is one of the more promising spectrally efficient, high data rate modulation techniques for line-of-sight communications between mobile platforms. This paper will show that legacy FSK radios like the AN/MRC-142 (binary FSK modulation at 144, 288, 576 kbps) used by the U.S. Marine Corps could be easily implemented in a COFDM modem originally designed for higher data rates and better spectral efficiency than the legacy radio. In addition, the performance of such an implementation is analyzed in detail and shown to result in negligible performance degradation (0.05 dB or less). Digital processing speed requirements are analyzed and shown to be similar to digital implementation of conventional FSK receivers. MATLAB code is included that simulates the modem.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1997
Accession Number
ADA324086

Entities

People

  • Paul H. Moose

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Algorithms
  • Carrier Frequencies
  • Computations
  • Computers
  • Correlators
  • Data Rate
  • Efficiency
  • Engineering
  • Frequency
  • Frequency Domain
  • Modulation
  • Modulators
  • Orthogonal Frequency Division Multiplexing
  • Phase Modulation
  • Time Domain
  • Transmitters
  • United States Government

Readers

  • Radio communications and signal processing.