Pulse or digital communications – Repeaters – Testing
Patent
1984-08-24
1986-09-23
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 14, 375100, 375102, 333 18, H04L 106, H04B 708, H04B 304
Patent
active
046139753
ABSTRACT:
The fading protection system protects against fading selectively occuring in a specific channel of a plural data transmission system. An equalizer is provided in each channel and adapted to equalize received data. An error correction mechanism is also provided for correcting errors of the received data in at least any one channel. A comparator associated with each channel is provided to deliver a first signal when the level of the received data in the associated channel has been reduced below a predetermined first threshold to indicate a level reduced channel. A controller operates in response to the first signal so as to deliver, as reference data, the correct data, after correction by the error correcting mechanism, to the equalizer provided in the level reduced channel. The controller also effects the supervised learning operation for correcting a coefficient of the equalizer in the level reduced channel so as to reduce the difference between the reference data and the output from the equalizer in the level reduced channel.
REFERENCES:
patent: 3633107 (1972-01-01), Brady
patent: 4394768 (1983-07-01), Sari
patent: 4408332 (1983-10-01), Sari
patent: 4467441 (1984-08-01), Gritton
"An Analysis of Automatic Equalizers for Orthogonally Multiplexed QAM Systems", Botaro Hirosaki, IEEE Transactions, vol. Com-28, No. 1, Jan. 1980, pp. 73-83.
"A Highly Efficient HF Modem with Adaptive Fading Control Algorithm", Botaro Hirosaki and Hidehito Aoyagi, Globecom '84, Nov. 29, 1984.
Aoyagi Hidehito
Hirosaki Botaro
Glenny Raymond C.
NEC Corporation
Safourek Benedict V.
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