Pulse or digital communications – Equalizers
Patent
1994-06-30
1996-09-17
Chin, Stephen
Pulse or digital communications
Equalizers
375331, 375349, 455 63, 455 65, H03H 730, H03K 5159
Patent
active
055576400
ABSTRACT:
An equalisation arrangement compensates for multipath phase and amplitude distortion effects in a transmission channel by first measuring such distortion effects as they occur over time in a calibration phase, thereby obtaining phase and amplitude compensation factors, then applying these factors to a correcting circuit situated in the signal path of the receiver at the appropriate times during a subsequent data transmission phase. Calibration is achieved by feeding a received calibration signal to an amplifier, preferably a successive detection logarithmic amplifier (26), comparing the phase of the limited linear output of the logarithmic amplifier with a delayed version of itself (30, 28), and using the amplitude information (39) in the logarithmic output (72) of the logarithmic amplifier (26) and the phase-change information (35) resulting from the phase comparison to compute the phase and amplitude compensation coefficients. In the data transmission phase, the compensation coefficients are applied to amplifiers and multipliers, etc (56, 55), in the correcting circuit.
REFERENCES:
patent: 4673979 (1987-06-01), Kobo et al.
patent: 5170489 (1992-12-01), Glazebrook
patent: 5265125 (1993-11-01), Ohta
Chin Stephen
Plessey Semiconductor Limited
Vo Don
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