US7103109B2
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Randomly inverting pulse polarity in an UWB signal for power spectrum density shaping
Assignee: Mitsubishi Electric Research Laboratories Inc
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Filing: 2003-02-10
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Granted: 2006-09-05
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Expires: 2023-02-10
Abstract
Abstract A method eliminates spectral lines in a time hopping ultra wide bandwidth signal. First, a train of pulses is generated from input symbols. The pulses are then modulated in time according to symbols. The modulation can use pulse position modulation and time hopping. A polarity of the pulses is inverted randomly before transmitting the pulses as an ultra wide bandwidth signal. By randomly inverting the polarity of the pulses spectral lines in the ultra wide bandwidth signal are eliminated.
Inventors
- 👤 Yves-Paul Nakache
- 👤 Andreas Molisch
- 👤 Jinyun Zhang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:03
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03828; H04L25/03866; H04B; H04B1/00; H04B1/69; H04B1/7163; H04B1/71632; G; G01; G01S; G01S13/00; G01S13/02; G01S13/0209; H04B1/7176; H04B1/719; H04B2001/6908
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
51 words
A method for eliminating spectral lines in a time hopping ultra wide bandwidth signal, comprising: generating a train of non-periodic pulses; modulating the non-periodic pulses in time according to uncorrelated symbols; and inverting, randomly, a polarity of the non-periodic pulses before transmitting the non-periodic pulses as an ultra wide bandwidth signal.
Claim 2
Independent Claim
51 words
A method for eliminating spectral lines in a time hopping ultra wide bandwidth signal, comprising: generating a train of non-periodic pulses; modulating the non-periodic pulses in time according to uncorrelated symbols; and inverting, randomly, a polarity of the non-periodic pulses before transmitting the non-periodic pulses as an ultra wide bandwidth signal.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein each uncorrelated symbol includes one non-periodic pulse.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the modulation of the one non-periodic pulse per uncorrelated symbol is pulse position modulation.
Claim 5
Dependent Claim
19 words
The method of claim 2 wherein the modulation of the one non-periodic pulse per uncorrelated symbol is amplitude modulation.
Claim 6
Dependent Claim
26 words
The method of claim 2 wherein the modulation of the one non-periodic pulse per uncorrelated symbol is a combination of amplitude modulation and pulse position modulation.
Claim 7
Dependent Claim
34 words
The method of claim 4 wherein the pulse amplitude modulation is accomplished with on/off keying, wherein for every time period a zero is represented by a non-periodic pulse, and a one by no pulse.
Claim 8
Dependent Claim
16 words
The method of claim 1 wherein each uncorrelated symbol includes a combination of individual non-periodic pulses.
Claim 9
Dependent Claim
30 words
The method of claim 7 wherein the polarity of a combination of N non-periodic pulses of each uncorrelated symbol is randomly and independently inverted from uncorrelated symbol to uncorrelated symbol.
Claim 10
Dependent Claim
32 words
The method of claim 7 wherein the polarity of individual non-periodic pulses of each uncorrelated symbol are randomly and independently inverted within each uncorrelated symbol and from uncorrelated symbol to uncorrelated symbol.
Claim 11
Dependent Claim
32 words
The method of claim 7 wherein the polarity of individual non-periodic pulses of each uncorrelated symbol are randomly inverted within each uncorrelated symbol and identically inverted from uncorrelated symbol to uncorrelated symbol.
Claim 12
Dependent Claim
15 words
The method of claim 7 wherein the uncorrelated symbols are modulated by pulse position modulation.
Claim 13
Dependent Claim
14 words
The method of claim 7 where the uncorrelated symbols are modulated by amplitude modulation.
Claim 14
Dependent Claim
21 words
The method of claim 7 wherein the uncorrelated symbols are modulated by a combination of pulse position modulation and amplitude modulation.
Claim 15
Dependent Claim
19 words
The method of claim 7 wherein the combination of non-periodic pulses follows a pattern of a time hopping sequence.
Claim 16
Dependent Claim
21 words
The method of claim 14 wherein different time hopping sequences are used to encode a same uncorrelated symbol of a constellation.
Claim 17
Dependent Claim
29 words
The method of claim 1 further comprising: shaping a spectrum of the UWB signal to a predetermined shape by the random inverting of the polarity of the non-periodic pulses.
Claim 18
Dependent Claim
12 words
The method of claim 16 wherein the modulating is pulse amplitude modulation.
Claim 19
Dependent Claim
12 words
The method of claim 16 wherein the modulating is pulse position modulation.
Claim 20
Dependent Claim
19 words
The method of claim 14 wherein the modulating is a combination of pulse amplitude modulation and pulse position modulation.
Claim 21
Dependent Claim
29 words
The method of claim 7 further comprising: shaping a spectrum of the UWB signal to a predetermined shape by the random inverting of the polarity of the non-periodic pulses.
Claim 22
Dependent Claim
12 words
The method of claim 20 wherein the modulating is pulse amplitude modulation.
Claim 23
Dependent Claim
12 words
The method of claim 20 wherein the modulating is pulse position modulation.
Claim 24
Dependent Claim
19 words
The method of claim 20 wherein the modulating is a combination of pulse amplitude modulation and pulse position modulation.
Claim 25
Dependent Claim
29 words
The method of claim 9 further comprising: shaping a spectrum of the UWB signal to a predetermined shape by the random inverting of the polarity of the non-periodic pulses.
Claim 26
Dependent Claim
29 words
The method of claim 14 further comprising: shaping a spectrum of the UWB signal to a predetermined shape by the random inverting of the polarity of the non-periodic pulses.
Claim 27
Dependent Claim
24 words
The method of claim 1 further comprising: grouping sets of non-periodic pulses into subwaveforms; and means for inverting, randomly a polarity of the subwaveforms.
Claim 28
Dependent Claim
28 words
The method of claim 26 further comprising: shaping a spectrum of the UWB signal to a predetermined shape by the random inverting of the polarity of the subwaveforms.
Claim 29
Dependent Claim
59 words
The method of claim 2 further comprising: grouping sets of uncorrelated symbols; means for inverting, randomly, a polarity of the uncorrelated symbols a first set of the sets of uncorrelated symbols; and means for inverting a polarity of a next set of the sets of uncorrelated symbols according to the polarity of the uncorrelated symbols of the first set.
Claim 30
Independent Claim
57 words
A system for eliminating spectral lines in a time hopping ultra wide bandwidth signal, comprising: means for generating a train of non-periodic pulses; means for modulating the non-periodic pulses in time according to uncorrelated symbols; and means for inverting, randomly, a polarity of the non-periodic pulses before transmitting the non-periodic pulses as an ultra wide bandwidth signal.
Claim 31
Independent Claim
57 words
A system for eliminating spectral lines in a time hopping ultra wide bandwidth signal, comprising: means for generating a train of non-periodic pulses; means for modulating the non-periodic pulses in time according to uncorrelated symbols; and means for inverting, randomly, a polarity of the non-periodic pulses before transmitting the non-periodic pulses as an ultra wide bandwidth signal.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2009-09-04 | 2010-03-06 | 2010-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-09-04 | 2014-03-06 | 2014-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-09-04 | 2018-03-06 | 2018-09-05 | $7700.00 | Window Closed / Lapsed |