Accession Number:

ADA261788

Title:

Trellis Coded CPFSK

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1992-12-10

Pagination or Media Count:

55.0

Abstract:

Continuous Phase Frequency Shift Keying CPFSK is a potentially attractive modulation scheme with constant envelope and good spectral characteristics for energy constrained and band-limited satellite channels. This research deals with Orthogonal Frequency Shift Keying FSK, Minimum Shift Keying MSK which is a special case of CPFSK, uncoded quaternary CPFSK and finally coded quaternary CPFSK. Orthogonal FSK is simulated by making the modulation index h equal to one, and all the other simulations are performed with h12. A rate 12 convolutional encoder with constraint lengths k, k2, 3, and 4 are used in coded quaternary CPFSK simulations. Good coding gains are obtained with only a slight increase in receiver complexity. Soft decision with the Viterbi Algorithm was applied to all CPFSK and one MSK application. Hard decision was applied to Orthogonal FSK and another MSK application.

Subject Categories:

  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE