Space-diversity broad-band digital radio receiver

Details Space-diversity broad-band digital radio receiver Space-diversity broad-band digital radio receiver

1981-01-27

1983-05-17

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

375102, 455137, 455296, H04B 1500

Patent

active

043843581

ABSTRACT:
In order to reduce bit errors resulting in a space-diversity broad-band digital radio receiver from selective fading, an amplitude dispersion detector detects the amplitude dispersion caused, if any, by the selective fading in each of IF signals produced by the space-diversity reception and produces a detector output having an amplitude variable with the detected amplitude dispersion and used in combining the IF signals. The detector may comprise three band-pass filters having different narrow passbands in the IF band to produce filter outputs with amplitudes dependent on first-order and second-order dispersion components of the amplitude dispersion. Alternatively, the detector may comprise a band-pass filter having a narrow passband repeatedly variable throughout the IF band at a lower frequency to produce a filter output with an amplitude variable with the first-order and the second-order dispersion components and, above all, with a notch-shaped dispersion component.

REFERENCES:
patent: 3195049 (1965-07-01), Altman et al.
patent: 3302115 (1967-01-01), Shiki
patent: 3348152 (1967-10-01), Laughlin
patent: 3879664 (1975-04-01), Monsen

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