Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1991-10-31
1996-08-06
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375254, 375286, 371 43, H04L 512
Patent
active
055443281
ABSTRACT:
Digital signals, such as digitized television signals, are subjected to a source coding step followed by a channel mapping step. The source coding step causes the signal to be represented by first and second data streams. The first stream carries data regarded as more important and the second carries data regarded as less important. In the channel mapping step, the mapping is such that the data elements of the various data streams have differing probabilities of being erroneously detected at the receiver. The channel mapping step includes at least one multi-level coding step. The signal constellations used in the channel mapping step are partitioned into supersymbols, in which the distance between the symbols comprising at least ones of the supersymbols is less than a parameter referred to as the maximum intra-subset distance (MID). Additionally, in some constellations, the minimum distance between at least ones of the symbols of at least one of the supersymbols is greater than the minimum distance between the symbols of the constellation as a whole while, again, still being less than the MID. The first data stream is used to identify a sequence of supersymbols, while the second data stream is used to select particular symbols from the identified supersymbols.
REFERENCES:
patent: 4520490 (1985-05-01), Wei
patent: 4651320 (1987-03-01), Thapar
patent: 5029185 (1991-07-01), Wei
patent: 5105442 (1992-04-01), Wei
patent: 5105443 (1992-04-01), Betts et al.
patent: 5134464 (1992-07-01), Basile et al.
AT&T Bell Laboratories
Chin Stephen
deBlasi Gerard A.
Ghebretinsae T.
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