Accession Number:

ADA209737

Title:

Theory of Multi-Frequency Modulation (MFM) Digital Communications

Descriptive Note:

Interim rept. Oct 1988-Mar 1989

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1989-05-05

Pagination or Media Count:

44.0

Abstract:

Multi-frequency modulation MFM is a new digital signal processing DSP oriented communications signal developed at NPS specifically for computer- to-computer communications links and information exchange networks. MFM utilizes the hardware and software of the host computers to generate and to demodulate coherent communications discrete time signals. In this report, the theory behind MFM generation and reception is presented. Auto-correlation functions and power spectral densities of MFM signals are derived and examples presented for lowpass and bandpass white MFM sequences. The bit error rates are computed for three types of MFM MFBPSK, MFQPSK and MF16-QAM. These modulation formats provide one, two and four bits per Hz of channel bandwidth respectively. Optimization arguments show that best system performance is obtained by using the maximum possible number of tones with the limit on the number of tones being set either by the packet length or the coherence time of the channel, whichever is shorter.

Subject Categories:

  • Command, Control and Communications Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE