US5748667A
Expired / Lapsed
US
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Spread spectrum modulation using time varying linear filtering
Assignee: United States Department of the Navy
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Filing: 1996-03-25
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Granted: 1998-05-05
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Expires: 2016-03-25
Abstract
Abstract A method for transmitting information by radio over a wide bandwidth comprises the steps of: inputting a data signal into a time varying filter modulator; spreading the data signal in time and in frequency to produce a wideband signal; modulating the wideband signal onto an RF carrier to provide an RF output signal; and transmitting the RF output signal. The step of spreading includes performing a series of linear transformations to the data signal.
Inventors
- 👤 Howard L. Dyckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:00
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
63 words
A method for transmitting information by radio over a wide bandwidth, comprising the steps of: 1) inputting a data signal into a time varying filter modulator; 2) spreading the data signal in time and in frequency to produce a wideband signal; 3) modulating the wideband signal onto an RF carrier to provide an RF output signal; and 4) transmitting the RF output signal.
Claim 2
Independent Claim
63 words
A method for transmitting information by radio over a wide bandwidth, comprising the steps of: 1) inputting a data signal into a time varying filter modulator; 2) spreading the data signal in time and in frequency to produce a wideband signal; 3) modulating the wideband signal onto an RF carrier to provide an RF output signal; and 4) transmitting the RF output signal.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein step (2) includes performing a series of linear transformations on the data signal.
References Cited (Backward Citations)
US5005204A
Cited
US5012490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-04 | 2001-11-03 | 2002-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-04 | 2005-11-03 | 2006-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-04 | 2009-11-03 | 2010-05-05 | $7700.00 | Window Closed / Lapsed |