US5621762A
Expired / Lapsed
US
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Radio with peak power and bandwidth efficient modulation
Assignee: Motorola Solutions Inc
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Filing: 1995-06-12
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Granted: 1997-04-15
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Expires: 2015-06-12
Abstract
Abstract A communication device (300) includes a digital modulator (301), a Digital Signal Processor (306), and an amplifier (312). The digital modulator (301) includes an information generator (304) and a peak suppression device (402). The peak suppression device (402) includes a symbol mapper (404) and a symbol scaler (406). The information generated by the generator (401) are mapped on a constellation diagram via the symbol mapper (404). The mapped information is then scaled at the scaler (406) in order to reduce the peak-to-average ratio of the signal at the input to the amplifier (312).
Inventors
- 👤 Scott L. Miller
- 👤 Robert J. O'Dea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:44
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/36; H04L27/366
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
72 words
A method for modulating a digital information, comprising: generating the digital information; mapping the digital information onto a constellation diagram to produce data symbols each having an onset; processing the data symbols at a rate which separates them at their respective onset via a symbol interval; representing the data symbols in I and Q signal components; and scaling the I and Q signal components to reduce peak power while maintaining average power.
Claim 2
Independent Claim
72 words
A method for modulating a digital information, comprising: generating the digital information; mapping the digital information onto a constellation diagram to produce data symbols each having an onset; processing the data symbols at a rate which separates them at their respective onset via a symbol interval; representing the data symbols in I and Q signal components; and scaling the I and Q signal components to reduce peak power while maintaining average power.
Claim 3
Dependent Claim
33 words
The method of claim 1, wherein the step of processing includes the step of filtering the I and Q signal components to maximize spectral efficiency and to produce baseband I and Q signals.
Claim 4
Dependent Claim
21 words
The method of claim 2, further including the step of determining the average power of the baseband I and Q signal.
Claim 5
Dependent Claim
26 words
The method of claim 2, further including the step of determining the instantaneous peak power of the baseband I and Q signal over each symbol interval.
Claim 6
Dependent Claim
31 words
The method of claim 4, further including the step of determining the time at which the instantaneous peak power of the baseband I and Q signal occurs on each symbol interval.
Claim 7
Dependent Claim
40 words
The method of claim 5, wherein the step of scaling includes the step of scaling the I and Q signal components utilizing the instantaneous peak power and the time at which the instantaneous peak power occurs on each symbol interval.
Claim 8
Dependent Claim
23 words
The method of claim 2, further including the step of combining the baseband I and Q signals to produce a composite baseband signal.
Claim 9
Dependent Claim
19 words
The method of claim 7, further including the step of determining the average power of the composite baseband signal.
Claim 10
Dependent Claim
23 words
The method of claim 7, further including the step of determining the peak power of the composite baseband signal at each symbol interval.
Claim 11
Dependent Claim
29 words
The method of claim 9, further including the step of determining the time at which the instantaneous peak power of the composite baseband signal occurs at each symbol interval.
Claim 12
Dependent Claim
40 words
The method of claim 10, wherein the step of scaling includes the step of scaling the I and Q signal components utilizing the instantaneous peak power and the time at which the instantaneous peak power occurs on each symbol intervals.
Claim 13
Dependent Claim
22 words
The method of claim 1, wherein the step of scaling includes altering the amplitude of the I and Q signal components equally.
Claim 14
Dependent Claim
24 words
The method of claim 1, wherein the step of scaling includes altering the amplitude of the I and Q signal components independently and unequally.
Claim 15
Dependent Claim
61 words
A digital modulator, comprising: a digital information generator; means for mapping the digital information onto a constellation diagram to produce data symbols each having a symbol interval; means for representing the data symbols in I and Q signal components; and means for dynamically altering the amplitude of the I and Q signal components in order to reduce the peak-to-average power ratio.
Claim 16
Dependent Claim
61 words
A digital modulator, comprising: a digital information generator; means for mapping the digital information onto a constellation diagram to produce data symbols each having a symbol interval; means for representing the data symbols in I and Q signal components; and means for dynamically altering the amplitude of the I and Q signal components in order to reduce the peak-to-average power ratio.
Claim 17
Dependent Claim
17 words
The digital modulator of claim 14, wherein the means for representing includes a Digital Signal Processor (DSP).
Claim 18
Dependent Claim
21 words
The digital modulator of claim 14, further including a filter for producing baseband I and Q signals with maximum spectral efficiency.
Claim 19
Dependent Claim
21 words
The digital modulator of claim 16, further including means for determining the average power of the baseband I and Q signals.
Claim 20
Dependent Claim
17 words
The digital modulator of claim 17, wherein the means for determining includes a Digital Signal Processor (DSP).
Claim 21
Dependent Claim
26 words
The digital modulator of claim 16, further including means for determining the instantaneous peak power of the baseband I and Q signal over each symbol interval.
Claim 22
Dependent Claim
31 words
The digital modulator of claim 19, further including a timer for determining the time at which the peak power of the baseband I and Q signals occurs on each symbol interval.
Claim 23
Dependent Claim
24 words
The digital modulator of claim 16, further including a combiner for combining the baseband I and Q signals to produce a composite baseband signal.
Claim 24
Dependent Claim
61 words
A digital modulator, comprising: a digital information generator; means for convening the digital information into a multi-dimensional signal constellation to produce data symbols each having a magnitude and a phase; and means for forming a sphere around each data symbol within which the magnitude and the phase of the data symbol could be altered in order to minimize peak-to-average power ratio.
Claim 25
Dependent Claim
61 words
A digital modulator, comprising: a digital information generator; means for convening the digital information into a multi-dimensional signal constellation to produce data symbols each having a magnitude and a phase; and means for forming a sphere around each data symbol within which the magnitude and the phase of the data symbol could be altered in order to minimize peak-to-average power ratio.
Claim 26
Dependent Claim
63 words
A digital modulator, comprising: a digital information generator; means for converting the digital information into a signal constellation having at least one dimension in order to produce data symbols each having a magnitude; and means for dynamically scaling the magnitude of the data symbols in order to avoid undesired peak power occurrences at symbol transitions and therefore minimizing the peak-to average power ratio.
Claim 27
Dependent Claim
63 words
A digital modulator, comprising: a digital information generator; means for converting the digital information into a signal constellation having at least one dimension in order to produce data symbols each having a magnitude; and means for dynamically scaling the magnitude of the data symbols in order to avoid undesired peak power occurrences at symbol transitions and therefore minimizing the peak-to average power ratio.
Claim 28
Dependent Claim
77 words
A communication device, comprising: a digital modulator, comprising: a digital information generator; means for converting the digital information into a signal constellation having at least one dimension in order to produce data symbols each having a magnitude; and means for dynamically scaling the data symbols in order to avoid undesired peak power occurrences at symbol transitions and therefore minimize peak-to-average power ratio. an amplifier for amplifying the data symbols; and an antenna for transmitting the data symbols.
Claim 29
Dependent Claim
77 words
A communication device, comprising: a digital modulator, comprising: a digital information generator; means for converting the digital information into a signal constellation having at least one dimension in order to produce data symbols each having a magnitude; and means for dynamically scaling the data symbols in order to avoid undesired peak power occurrences at symbol transitions and therefore minimize peak-to-average power ratio. an amplifier for amplifying the data symbols; and an antenna for transmitting the data symbols.
Claim 30
Dependent Claim
23 words
The communication device of claim 24, wherein the means for dynamically scaling include a DSP for scaling the magnitude of the data symbols.
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) | 2000-04-14 | 2000-10-14 | 2001-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-14 | 2004-10-14 | 2005-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-14 | 2008-10-14 | 2009-04-15 | $7700.00 | Window Closed / Lapsed |