US3965422A
Expired / Lapsed
US
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System channel distortion weighting for predetection combiners
Assignee: United States Department of the Air Force
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Filing: 1974-07-26
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Granted: 1976-06-22
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Expires: 1994-07-26
Abstract
Abstract A tropo system channel distortion weighting apparatus for predetection combiners for modifying the predetection combiner algorithm to improve the output carrier to noise ratio in the presence of signal distortion.
Inventors
- 👤 Olindo A. Tagliaferri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:39
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0837; H04B7/0842; H04B7/0848; H04B7/0851
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
237 words
A system channel distortion weighting apparatus for predetection combiners comprising in combination: a plurality of diversity receiver channels respectively providing a plurality of I.F. signals, said plurality of diversity receiver channels each having a level control means connected thereto to control signal level within each receiver channel, said plurality of diversity receiver channels each having an amplitude distorted signal therein, summing means connected to each of said plurality of diversity receiver channels to sum each of said amplitude distorted signals therefrom, said summing means providing a summed amplitude distorted signal, means for envelope detecting said summed amplitude distorted signal, said detecting means providing a signal envelope representative of the distorted amplitude thereof, means for envelope detecting each of said amplitude distorted signals thereby providing a plurality of signal envelopes representative of the amplitude distortion in each of said signals, and means for correlating said distorted signal envelope of said summed signal with each of said plurality of amplitude distorted signal envelopes to provide an output voltage, said output voltage being proportional to the correlation between each of said amplitude distorted signal envelopes and said distorted signal envelope of said summed signal, control signal means producing means providing a level control signal in response to said output voltage, said level control signal being applied to each of said level control means, said level control means adjusting each diversity receiver channel gain in response to said level control signal.
Claim 2
Independent Claim
237 words
A system channel distortion weighting apparatus for predetection combiners comprising in combination: a plurality of diversity receiver channels respectively providing a plurality of I.F. signals, said plurality of diversity receiver channels each having a level control means connected thereto to control signal level within each receiver channel, said plurality of diversity receiver channels each having an amplitude distorted signal therein, summing means connected to each of said plurality of diversity receiver channels to sum each of said amplitude distorted signals therefrom, said summing means providing a summed amplitude distorted signal, means for envelope detecting said summed amplitude distorted signal, said detecting means providing a signal envelope representative of the distorted amplitude thereof, means for envelope detecting each of said amplitude distorted signals thereby providing a plurality of signal envelopes representative of the amplitude distortion in each of said signals, and means for correlating said distorted signal envelope of said summed signal with each of said plurality of amplitude distorted signal envelopes to provide an output voltage, said output voltage being proportional to the correlation between each of said amplitude distorted signal envelopes and said distorted signal envelope of said summed signal, control signal means producing means providing a level control signal in response to said output voltage, said level control signal being applied to each of said level control means, said level control means adjusting each diversity receiver channel gain in response to said level control signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |