Excavating
Patent
1987-07-24
1990-10-30
Smith, Jerry
Excavating
371 377, 371 43, 375102, 375104, H04B 110, H04L 120, H03M 1300, H03M 1312
Patent
active
049674137
ABSTRACT:
An apparatus for detecting burst signals used in satellite communication, for example, detects burst signals of the type comprising a unique word followed by a series of data. The burst signals are of the type that have undergone cyclic redundancy check (CRC) coding and error-correction coding. A unique word detector detects the unique word in the burst signal. An error-correcting decoder decodes the error-correction code used with the data. Two forms of error detection are used to reduce the possibility of erroneous data being mistakenly considered error-free. A cyclic redundancy check error detector detects any CRC error in the decoded data. A channel quality detector detects quality of the channel on which the burst signal is received. An output circuit provides an output signal indicating presence or absence of error in the data in response to outputs of the unique word detector, the CRC error detector, and the channel quality detector.
REFERENCES:
patent: 4312070 (1982-01-01), Coombes et al.
patent: 4686690 (1987-08-01), Sato
Product description of MC8506 Polynomial Generator by Motorola, Inc. (1983) 8 pages.
CCITT Recommendation X.25 (1980), 7 pages.
"SCPC/QPSK and SCPC/PCM/QPSK System Specification" Intelsat Earth Station Standards (IESS) Document IESS-303, pp. 1 to 61, especially FIGS. 6, published Jul. 1, 1985.
Baker Stephen M.
NEC Corporation
Smith Jerry
LandOfFree
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