Pulse or digital communications – Repeaters – Testing
Patent
1991-10-31
1994-04-19
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375 59, 375 94, H04L 512
Patent
active
053053524
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 of 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: 4644537 (1987-02-01), Gitlin et al.
patent: 5105443 (1992-04-01), Betts et al.
patent: 5134464 (1992-07-01), Basile et al.
patent: 5164963 (1992-11-01), Lawrence et al.
patent: 5214656 (1993-05-01), Chung et al.
W. F. Schreiber, "Spread-Spectrum Television Broadcasting", SMPTE Jrn., Aug. 1992, pp. 538-549.
K. M. Uz et al., "Multiresolution Source & Channel Coding . . . ", Signal Processing of HDTV, III, 1992 Elsevier Science Publishers, pp. 61-69.
M. Vetterli et al. "Multiresolution Coding Techniques for Digital TV", Multidimensional Systems & Signal Processing, 1992, Kluwer Academic Publishers, Boston, pp. 53-59.
K. M. Uz et al., "Combined Multiresolution Source Coding & Modulation. . . ", Signal Processing, 1992, Elsevier Science Publs. pp. 283-290.
Calderbank Arthur R.
Seshadri Nambirajan
AT&T Bell Laboratories
Bocure Tesfaldet
Chin Stephen
deBlasi Gerard A.
Slusky Ronald D.
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