Baseband estimator for estimating the amplitude/frequency charac

Details Baseband estimator for estimating the amplitude/frequency charac Baseband estimator for estimating the amplitude/frequency charac

1994-12-22

1997-10-14

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

375266, 375345, 375350, 36472416, 3647242, H03H 730

Patent

active

056779321

ABSTRACT:
An estimator for estimating the amplitude/frequency characteristic of a source signal from which baseband components i and q which are applied to the inputs of said estimator are derived by demodulation using two signals having orthogonal phases. The estimator includes a combiner for generating complex components i+j.multidot.q and q+j.multidot.i from the components i and q and evaluates the relative amplitudes of the complex components in order to produce a coefficient representative of the amplitude/frequency characteristic of the source signal. The invention can be used to implement a frequency equalizer whose estimator operates in the baseband, the estimator possibly driving a transversal filter operating at the intermediate frequency or at the microwave frequency.

REFERENCES:
patent: 4020333 (1977-04-01), Nussbaumer
patent: 4638495 (1987-01-01), Mizoguchi
patent: 4985900 (1991-01-01), Rhind et al.
patent: 5533050 (1996-07-01), Isard et al.
Chamberlain et al, "Receiver Technique for Microwave Digital Radio", IEEE Communications Magazine, vol. 24, No. 11, Nov. 1986, pp. 43-53.
Davyrian "Mobile Digital Communications", IEEE Transactions on Vehicular Technology, vol. VT-36, No. 2, Mayy 1987, pp. 55-62.
French Search Report FR 9315906.

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