H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/74, 328/0.2
H04L 1/20 (2006.01) H04L 25/03 (2006.01) H04L 27/01 (2006.01)
Patent
CA 1338961
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 theparticular channel. The equalizer of the invention preferably comprises: first and second FIRs each having a plurality of taps for storing data signal samples overtime, a plurality of tap gain means for multiplying the equalizer coefficients with the stored data samples, a coefficient update for comparing the sum of the tap gain means products to an ideal value and for changing said equalizer coefficients accordingly, and processing means for processing the communications data according to the adapted equalizer coefficients; a buffer delay means 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 means 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 means stores the communications data while the FIRs use the communication data to continue to adapt the equalizer coefficients.
588350
General Datacomm Inc.
Osler Hoskin & Harcourt Llp
Potter William James
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