Pulse or digital communications – Repeaters – Testing
Patent
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
Griffin Robert L.
Huseman Marianne
Penril Corporation
LandOfFree
Modem and method for 8 dimensional trellis code modulation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modem and method for 8 dimensional trellis code modulation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modem and method for 8 dimensional trellis code modulation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1962224