Unfiltered FQPSK: Another Interpretation and Further Enhancements

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Author information
Dr. Marvin K. Simon is a Senior Research Engineer at
the Jet Propulsion Laboratory (JPL), California
Institute of Technology, Pasadena, CA. For the last 31
years, he has performed research as applied to the
design of NASA’s deep-space and near-earth missions,
resulting in the issuance of 9 patents and 23 NASA Tech
Briefs. Dr. Simon is particularly well-versed in the subject
of digital communications, with emphasis in several
disciplines of modulation and demodulation, synchronization
techniques for space, and satellite and radio
communications. He has published more than 140
papers on the above subjects and is co-author of several
textbooks. He is a Fellow of the IEEE and of the IAE,
winner of a NASA Exceptional Service Medal and a
NASA Exception Engineering Achievement Medal, and
most recently winner of the IEEE Edwin H. Armstrong
Achievement Award. Dr. Simon may be reached via e-
mail at marvin.k.simon@jpl.nasa.gov.
Dr. Tsun-Yee Yan is the Technical Group Supervisor of
the Digital Signal Processing Research Group,
Communications Systems Research Section, at the Jet
Propulsion Laboratory, Pasadena, CA. He is also the
area program manager for Spacecraft Communications
of the Technology and Applications Program Office at
JPL, managing a sizable research and development
effort in the high rate data communications area. He
received the B.Sc. degree in electronics from the Chinese
University of Hong Kong, and the M.Sc. and Ph.D.
degrees in Electrical Engineering from the University of
California, Los Angeles. Dr. Yan has published more
than 60 journal and conference papers.
Appendix 1. Trellis state transitions.
current state input output next state
0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 1 1 12 0 0 1 0
0 0 0 0 1 0 0 1 1 0 0 0
0 0 0 0 1 1 1 13 1 0 1 0
0 0 1 0 0 0 3 4 0 0 0 1
0 0 1 0 0 1 2 8 0 0 1 1
0 0 1 0 1 0 3 5 1 0 0 1
0 0 1 0 1 1 2 9 1 0 1 1
1 0 0 0 0 0 12 3 0 1 0 0
1 0 0 0 0 1 13 15 0 1 1 0
1 0 0 0 1 0 12 2 1 1 0 0
1 0 0 0 1 1 13 14 1 1 1 0
1 0 1 0 0 0 15 7 0 1 0 1
1 0 1 0 0 1 14 11 0 1 1 1
1 0 1 0 1 0 15 6 1 1 0 1
1 0 1 0 1 1 14 10 1 1 1 1
0 0 0 1 0 0 2 0 0 0 0 0
0 0 0 1 0 1 3 12 0 0 1 0
0 0 0 1 1 0 2 1 1 0 0 0
0 0 0 1 1 1 3 13 1 0 1 0
0 0 1 1 0 0 1 4 0 0 0 1
0 0 1 1 0 1 0 8 0 0 1 1
0 0 1 1 1 0 1 5 1 0 0 1
0 0 1 1 1 1 0 9 1 0 1 1
1 0 0 1 0 0 14 3 0 1 0 0
1 0 0 1 0 1 15 15 0 1 1 0
1 0 0 1 1 0 14 2 1 1 0 0
1 0 0 1 1 1 15 14 1 1 1 0
1 0 1 1 0 0 13 7 0 1 0 1
1 0 1 1 0 1 12 11 0 1 1 1
1 0 1 1 1 0 13 6 1 1 0 1
1 0 1 1 1 1 12 10 1 1 1 1
current state input output next state
0 1 0 0 0 0 4 2 0 0 0 0
0 1 0 0 0 1 5 14 0 0 1 0
0 1 0 0 1 0 4 3 1 0 0 0
0 1 0 0 1 1 5 15 1 0 1 0
0 1 1 0 0 0 7 6 0 0 0 1
0 1 1 0 0 1 6 10 0 0 1 1
0 1 1 0 1 0 7 7 1 0 0 1
0 1 1 0 1 1 6 11 1 0 1 1
1 1 0 0 0 0 8 1 0 1 0 0
1 1 0 0 0 1 9 13 0 1 1 0
1 1 0 0 1 0 8 0 1 1 0 0
1 1 0 0 1 1 9 12 1 1 1 0
1 1 1 0 0 0 11 5 0 1 0 1
1 1 1 0 0 1 10 9 0 1 1 1
1 1 1 0 1 0 11 4 1 1 0 1
1 1 1 0 1 1 10 8 1 1 1 1
0 1 0 1 0 0 6 2 0 0 0 0
0 1 0 1 0 1 7 14 0 0 1 0
0 1 0 1 1 0 6 3 1 0 0 0
0 1 0 1 1 1 7 15 1 0 1 0
0 1 1 1 0 0 5 6 0 0 0 1
0 1 1 1 0 1 4 10 0 0 1 1
0 1 1 1 1 0 5 7 1 0 0 1
0 1 1 1 1 1 4 11 1 0 1 1
1 1 0 1 0 0 10 1 0 1 0 0
1 1 0 1 0 1 11 13 0 1 1 0
1 1 0 1 1 0 10 0 1 1 0 0
1 1 0 1 1 1 11 12 1 1 1 0
1 1 1 1 0 0 9 5 0 1 0 1
1 1 1 1 0 1 8 9 0 1 1 1
1 1 1 1 1 0 9 4 1 1 0 1
1 1 1 1 1 1 8 8 1 1 1 1
96 · APPLIED MICROWAVE & WIRELESS