Modem and method for 8 dimensional trellis code modulation

Details Modem and method for 8 dimensional trellis code modulation Modem and method for 8 dimensional trellis code modulation

1987-09-16

1989-10-10

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 31, 371 43, H04B 1406

Patent

active

048737011

ABSTRACT:
A modem and method for modulation-demodulation of a received analog signal. The modem receives sixteen bits at four bits per baud. The 8 D Block Encoder encodes nine of the sixteen bits into 12 Z-bits which are used to specify a sequence of four 2 D constellation points. These 2 D constellation points correspond to a sequence of four 2 D subsets of a 8 D subtype selected. The differential encoder differentially encodes two of the sixteen bits to make the code transparent to a 90 degree rotation. The rate 3/4 convolutional encoder generates a check bit and a bit converter converts the check bit, the differential encoded bits and the remaining five bits into 8 Z-bits. The result is an 8 D trellis with a 20-point 2 D constellation.

REFERENCES:
patent: 4597090 (1986-06-01), Forney, Jr.
patent: 4641327 (1987-02-01), Wei

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