Application of Multi-Frequency Modulation (MFM) for High-Speed Data Communications to a Voice Frequency Channel

Abstract

Multi-Frequency Modulation (MFM) has been developed at NPS using both differential quadrature-phase-shift-keying (DQPSK) and differential-quadrature- amplitude-modulation (DQAM) encoding formats. Previous applications of these encoding formats were on industry standard computers (PC) over a 16-20 kHz channel. This report discusses the implementation of MFM to a voice frequency channel of 200-3400 Hz, for possible future use with high-speed modems over switched telephone networks. Research and testing for this report included the DQPSK and differential 16-quadrature-amplitude-modulation (D16-QAM) encoding formats implemented on PCs. Experimental results of the implemented MFM signal were comparable to theory with acceptable bit error rates for input signal-to-noise ratios (SNR) of 15 dB and higher.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1990
Accession Number
ADA238019

Entities

People

  • Charles P. Salsman

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Amplitude Modulation
  • Coding
  • Communication Equipment
  • Computer Programming
  • Computer Programs
  • Computers
  • Data Transmission
  • Decoding
  • Demodulation
  • Digital Communications
  • Frequency
  • Frequency Modulation
  • Modulation
  • Packet Switching
  • Phase Shift
  • Standards
  • Telephone Lines

Readers

  • Radio communications and signal processing.