Modified QAM data point constellation for secondary channel sign

Details Modified QAM data point constellation for secondary channel sign Modified QAM data point constellation for secondary channel sign

1984-12-03

1986-12-02

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

3701104, 332 10, H03C 500, H04L 2700

Patent

active

046270779

ABSTRACT:
A method of adding a secondary channel to a QAM signal mapped in the complex plane is provided. A pair of positions in the mapped complex plane is determined such that the positions are equi-distant from the origin and no greater from the origin than the distance from the origin to the position of the furthest mapped data point. For secondary channel communication, a data point is shifted from a normal mapped position to one or the other of the new positions with one of said positions assuming a binary "1" for the secondary channel and the other of said positions assuming a binary "0".

REFERENCES:
patent: 3718766 (1973-02-01), Stover
patent: 3955141 (1976-05-01), Lyon et al.
patent: 4227152 (1980-10-01), Godard et al.
patent: 4271509 (1981-06-01), Brolin
patent: 4347616 (1982-08-01), Murakami
patent: 4389722 (1983-06-01), Hofmeister
patent: 4442530 (1984-04-01), Parrish, Jr. et al.

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