| 摘要 |
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 at the appropriate times during a subsequent data transmission phase to a correcting means situated in the signal path. 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 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 means. <IMAGE>
|
