Pulse or digital communications – Repeaters – Testing
Patent
1982-02-25
1985-08-27
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 42, 375 43, 329135, 332 17, H03C 500
Patent
active
045382840
ABSTRACT:
Locations of a desired number of signal points for a double side band-quadrature carrier modulation system occupy the inner intersections of a multiplicity of concentric rings with a triangular grid. The signal point locations of the desired number on the outer partially occupied ring are provided with additional signal points at positions selected to provide that the centroid of the set of locations is at the center of the rings.
REFERENCES:
patent: 3805191 (1974-04-01), Kawai et al.
patent: 3818135 (1974-06-01), Tannhauser
patent: 3955141 (1976-05-01), Lyon et al.
patent: 3982077 (1976-09-01), Clark et al.
patent: 3988539 (1976-10-01), Motley et al.
patent: 4024342 (1977-05-01), Croisier et al.
patent: 4035767 (1977-07-01), Chen et al.
patent: 4495477 (1985-01-01), Weber
D. L. Lyon, "Practical Signal Space Coding for the Telephone Channel," Proceedings of the Nat. Electr. Conference, vol. 29, No. 29, Oct. 1974, pp. 290-294.
Marvin K. Simon and Joel G. Smith, "Hexagonal Multiple Phase-and-Amplitude-Shift-Keyed Signal Sets," IEEE Transactions on Communications, vol. 21, No. 10, Oct. 1973, pp. 1108-1115.
Forney, Jr. George D.
Lang Gordon R.
Lee Chi H.
Longstaff Fred M.
Qureshi Shahid
Ese Limited
Glenny Raymond C.
Griffin Robert L.
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