Coded modulation with unequal error protection

Details Coded modulation with unequal error protection Coded modulation with unequal error protection

1990-11-07

1992-04-14

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 34, 375 58, 358 13, H04L 2734

Patent

active

051054426

ABSTRACT:
Digital signals, such as digitized television signals, are subjected to a source coding step in which a class of "most important" data elements represents a proportionately greater amount of the information to be communicated than the rest of the data elements. This is followed by a constellation mapping step which is carried out in such a way that those data elements have a lower probability of being erroneously detected at the receiver than the others. The constellation mapping step uses coded modulation in order to provide enhanced noise immunity for the "most important" data element class.

REFERENCES:
patent: 4520490 (1985-05-01), Wei
patent: 4597090 (1986-06-01), Forney, Jr.
patent: 4601044 (1986-07-01), Kromer, III et al.
patent: 4641179 (1987-02-01), Locicero et al.
patent: 4651320 (1987-03-01), Thapar
patent: 4882733 (1989-11-01), Tanner

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