Adaptive if equalizer for digital transmission

Details Adaptive if equalizer for digital transmission Adaptive if equalizer for digital transmission

H - Electricity

04

B

333/27

H04B 3/14 (2006.01) H04B 3/04 (2006.01) H04B 7/005 (2006.01)

Patent

CA 1187569

AN ADAPTIVE IF EQUALIZER FOR DIGITAL TRANSMISSION Abstract of Disclosure A radio signal will often suffer from amplitude and group delay distortion caused by multipath fading. An adaptive equalizer, which effectively cancels the amplitude distortion effects, is based upon the use of control voltages derived from selected por- tions of the IF band; said control voltages being selectively ap- plied to bump and slope equalizer sections to cancel the effects of amplitude distortion. Cancellation of group delay distortion is predicated upon its being proportional to amplitude of the slope correction required. Thus, group delay correction is introduced in relation to the slope correction introduced to compensate for dis- tortion introduced during normal multipath propagation conditions. -17-

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