US5287387A
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Low splatter peak-to-average signal reduction
Assignee: Motorola Mobility LLC
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Filing: 1992-03-06
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Granted: 1994-02-15
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Expires: 2012-03-06
Abstract
Abstract In order to maintain low-splatter in a peak-to-average reduction for a linear communication system, a method of windowed-clipping is used. When a sample of input signal is determined to be above a predetermined threshold, a signal peak is found and an attenuating window is centered at the peak. The attenuating window is applied to the input signal.
Inventors
- 👤 Mark A. Birchler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:05
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/08; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04B1/0475; H04L; H04L27/00; H04L27/26; H04L27/2601; H04L27/2614; H04L27/2623; H04L27/2624; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70706
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
46 words
A method of low-splatter peak-to-average reduction for a linear communication system, comprising the steps of: determining a local maximum of an input signal that is above a predetermined threshold; centered an attenuating window at said local maximum; and applying said attenuating window to said input signal.
Claim 2
Independent Claim
46 words
A method of low-splatter peak-to-average reduction for a linear communication system, comprising the steps of: determining a local maximum of an input signal that is above a predetermined threshold; centered an attenuating window at said local maximum; and applying said attenuating window to said input signal.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said attenuating window is an inverted Hanning window.
Claim 4
Independent Claim
49 words
An apparatus for low-splatter peak-to-average reduction for a linear communication system, comprising: means for determining a local maximum of an input signal that is above a predetermined threshold; means for centering an attenuating window at said local maximum; and means for applying said attenuating window to said input signal.
Claim 5
Independent Claim
49 words
An apparatus for low-splatter peak-to-average reduction for a linear communication system, comprising: means for determining a local maximum of an input signal that is above a predetermined threshold; means for centering an attenuating window at said local maximum; and means for applying said attenuating window to said input signal.
Claim 6
Dependent Claim
14 words
The apparatus of claim 1, wherein said attenuating window is an inverted Hanning window.
Claim 7
Dependent Claim
82 words
A transmitter with an apparatus for low-splatter peak-to-average reduction for a linear modulation communication system, comprising: means for determining a local maximum of an input signal that is above a predetermined threshold; means for centering an attenuating window at said local maximum; means for applying said attenuating window to said input signal producing an attenuated input signal; and means, operatively coupled to said means for applying, for transmitting said attenuated input signal in a predetermined fashion in the linear modulation communication system.
Claim 8
Dependent Claim
82 words
A transmitter with an apparatus for low-splatter peak-to-average reduction for a linear modulation communication system, comprising: means for determining a local maximum of an input signal that is above a predetermined threshold; means for centering an attenuating window at said local maximum; means for applying said attenuating window to said input signal producing an attenuated input signal; and means, operatively coupled to said means for applying, for transmitting said attenuated input signal in a predetermined fashion in the linear modulation communication system.
Claim 9
Dependent Claim
14 words
The transmitter of claim 5, wherein said attenuating window is an inverted Hanning window.
Claim 10
Independent Claim
70 words
An apparatus for windowed clipping of a signal comprised of samples in a linear communication system, comprising: means for delaying the signal by a predetermined number of samples; means, coupled to said means for delaying, for triggering computation of windowed-clipping values; means, coupled to said means for triggering, for computing said windowed-clipping values; and means, coupled to said means for delaying, for combining said windowed-clipping values with said delayed signal.
Claim 11
Independent Claim
70 words
An apparatus for windowed clipping of a signal comprised of samples in a linear communication system, comprising: means for delaying the signal by a predetermined number of samples; means, coupled to said means for delaying, for triggering computation of windowed-clipping values; means, coupled to said means for triggering, for computing said windowed-clipping values; and means, coupled to said means for delaying, for combining said windowed-clipping values with said delayed signal.
Claim 12
Dependent Claim
22 words
The apparatus of claim 7, wherein said computing means further comprises means for calculating an attenuating window using an inverted Hanning window.
Claim 13
Independent Claim
47 words
A method of windowed clipping of a signal comprised of samples in a linear communication system, comprising the steps of: delaying the signal by a predetermined number of samples; triggering computation of windowed-clipping values; computing said windowed-clipping values; and combining said windowed-clipping values with said delayed signal.
Claim 14
Independent Claim
47 words
A method of windowed clipping of a signal comprised of samples in a linear communication system, comprising the steps of: delaying the signal by a predetermined number of samples; triggering computation of windowed-clipping values; computing said windowed-clipping values; and combining said windowed-clipping values with said delayed signal.
Claim 15
Dependent Claim
23 words
The method of claim 9, wherein said computing step further comprises the step of calculating an attenuating window using an inverted Hanning window.
Claim 16
Independent Claim
77 words
A method of low-splatter peak-to-average reduction for a signal in a linear communication system, comprising the steps of: determining magnitude of the signal; delaying the signal when the magnitude of the signal is below a first threshold; delaying and variably clipping the signal when the magnitude of the signal is above said first threshold and below a second threshold; and delaying and constantly clipping the signal when the magnitude of the signal is above said second threshold.
Claim 17
Independent Claim
77 words
A method of low-splatter peak-to-average reduction for a signal in a linear communication system, comprising the steps of: determining magnitude of the signal; delaying the signal when the magnitude of the signal is below a first threshold; delaying and variably clipping the signal when the magnitude of the signal is above said first threshold and below a second threshold; and delaying and constantly clipping the signal when the magnitude of the signal is above said second threshold.
Claim 18
Dependent Claim
21 words
The method of claim 11, wherein the step of variably clipping further comprises the step of applying an inverted Hanning window.
Claim 19
Dependent Claim
21 words
The method of claim 11, wherein the step of constantly clipping further comprises the step of applying an inverted Hanning window.
Claim 20
Independent Claim
44 words
A method of low-splatter peak-to-average reduction for a linear communication system, comprising the steps of: determining that a sample of an input signal is above a predetermined threshold; centering an attenuating window at said sample; and applying said attenuating window to said input signal.
Claim 21
Independent Claim
44 words
A method of low-splatter peak-to-average reduction for a linear communication system, comprising the steps of: determining that a sample of an input signal is above a predetermined threshold; centering an attenuating window at said sample; and applying said attenuating window to said input signal.
Claim 22
Dependent Claim
14 words
The method of claim 14, wherein said attenuating window is an inverted Hanning window.
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) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |