Method and apparatus for clearing data path in half duplex modem receiver while maintaining dynamic parameters
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United States of America Patent
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-
Dec 3, 1991
Grant Date -
N/A
app pub date -
Dec 21, 1989
filing date -
Dec 21, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A DSP receiver for a fast turnaround modem, particularly suited for a half duplex fast turnaround modem which prevents destruction of communication channel related adaptive equalizer parameters upon loss of carrier. Upon detection of carrier loss, after sufficient time has been allowed for the last informational data bits to pass through the receiver's adaptive equalizer, the output of the equalizer's FIR filter delay line is looped back, via a multiplexer, to the input of the equalizer so that communications channel related samples are continuously provided to the equalizer to maintain the parameters at values based on the receiver's actual experience with data transmitted through the communications channel to which it is connected. A delay timer responsive to the loss of carrier signal will terminate updating of the adaptive equalizer parameters a predetermined time after loss of carrier. Alternately, detection of a standard end of data flag in the data stream will also terminate parameter update.
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