Automatic equalizer

Details Automatic equalizer Automatic equalizer

1992-02-27

1994-06-14

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 12, H03H 730

Patent

active

053217233

ABSTRACT:
An automatic equalizer includes an adaptive matched filter connected in front of a decision feedback equalizer of a conventional design. The adaptive matched filter has an A/D converter for sampling and quantizing an analog baseband signal into a digital signal, which is applied to a transversal filter. The transversal filter is supplied with tap coefficients adaptively controlled by a control signal generator which makes automatic adjustments to symmetrize the impulse response of a transmission path depending on the status of fading. The automatic equalizer can sufficiently equalize the fading in the range .rho.>1 in which the reflected wave is stronger than the direct wave, which fading cannot be adequately equalized only by the conventional decision feedback equalizer.

REFERENCES:
patent: 3868603 (1975-02-01), Guidoux
patent: 4271525 (1981-06-01), Watanabe
patent: 4972433 (1990-11-01), Yamaguchi et al.
patent: 5119401 (1992-06-01), Tsujimoto
Watanabe, K., "Adaptive Matched Filter And Its Significance To Anti-Multipath Fading", in International Conference On Communications '86, Jun. 1986, vol. 3, pp. 1455-1459.
Eleftherious, E., et al., "Adaptive Equalization Techniques for HF Channels", in IEEE Journal on Selected Areas In Communications, Feb. 1987, vol SAC5, No. 5, pp. 238-247.

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