Inband coding of secondary data

Details Inband coding of secondary data Inband coding of secondary data

1990-05-29

1992-04-14

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

3701101, 3701104, H04L 512

Patent

active

051054434

ABSTRACT:
A modem which represents the transmitted primary data stream using signal points selected via a trellis code is provided with the further capability of transmitting secondary data. In particular, a standard constellation of signal points is expanded to include a number of signal points which is greater than that needed to transmit the primary data. Particular primary data word values are representable by either of a predetermined pair of signal points associated with that value--one signal point of the pair being a standard signal point and the other being an expanded signal point. The specific one of the two signal points of the pair that is transmitted at any given time is chosen as a function of whether the value of the next bit in the secondary data stream waiting to be transmitted is a "0" or "1". The location of each expanded signal point in the constellation is selected such that its distance from the nearest signal point in the trellis code subset of its associated standard signal point is substantially at least as great as the minimum distance between any two signal points in that subset.

REFERENCES:
patent: 4644537 (1987-02-01), Gitlin et al.

Affiliated with

Also associated with

Rating

Inband coding of secondary data does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Inband coding of secondary data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inband coding of secondary data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2355441