Pulse or digital communications – Repeaters – Testing
Patent
1988-01-14
1989-03-07
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
333 18, 3647242, H03H 730
Patent
active
048113603
ABSTRACT:
A data communication equipment equalizer which minimizes the total training time delay (RTS-CTS) is disclosed. The total RTS-CTS delay of the provided equalizer consists of a delay due to a minimal training sequence required for the equalizer coefficients to converge given a low distortion channel, plus whatever delay is necessary for the equalizer coefficients to converge given the particular channel. The equalizer of the invention preferably comprises: first and second FIRs each having a plurality of taps for storing data signal samples over time, a plurality of tap gain for multiplying the equalizer coefficients with the stored data samples, a coefficient update for comparing the sum of the tap gain products to an ideal value and for changing equalizer coefficients accordingly, and a processor for processing the communications data according to the adapted equalizer coefficients; a buffer delay for receiving and storing the communications data transmitted after the completion of the training sequence and before the equalizer coefficients have been sufficiently adapted to allow substantially error free transmission; and a data decision for deciding what ideal data value to assign a processed data sample. While the training sequence length is minimized for an optimal channel, no communications data is lost in a non-optimal channel as the buffer delay stores the communications data while the FIRs use the communications data to continue to adapt the equalizer coefficients.
REFERENCES:
patent: 3715666 (1973-02-01), Mueller et al.
patent: 4006352 (1977-02-01), Sato
patent: 4539689 (1985-09-01), Chiu et al.
patent: 4571733 (1986-02-01), Kaku et al.
patent: 4695969 (1987-09-01), Sollenberger
Chin Stephen
General Datacomm, Inc.
Gordon David P.
Griffin Robert L.
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