Multipoint data modem communication system
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United States of America Patent
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-
Mar 28, 1989
Grant Date -
N/A
app pub date -
Mar 2, 1988
filing date -
Nov 16, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multipoint data modem communication system includes a control modem (12) and a plurality of tributary modems (14, 16, 18). During an initial training mode, receiver parameters and equalizer coefficients are determined and stored in a storage device (156) in the control modem receiver at addresses associated with the tributary modems. During subsequent relatively short training signals, the stored parameters are accessed. The remote modems transmit identification address tones in parallel with the subsequent training signals, at frequencies separated by 200 Hz intervals from the training signal spectrum frequencies. A plurality of Discrete Fourier Transform (DFT) filter circuits (190) are utilized to determine the transmitted addresses by measuring the correlation of the received signal with locally-generated frequencies.
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