US6014407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for simultaneously broadcasting and receiving digital and analog signals
Assignee: Ibiquity Digital Corp
•
Filing: 1997-08-19
•
Granted: 2000-01-11
•
Expires: 2017-08-19
Abstract
Abstract A system and method for transmitting digital information through a medium such as atmospheric free-space includes a transmitter which generates a signal based on a basis set of mutually orthogonal, spectrally-shaped, sequences of substantially equal length and having predetermined autocorrelation values. The sequences may resemble noise in at least some of their characteristics. The orthogonality or cross-correlation characteristics, the autocorrelation characteristics and the resemblance to noise are due to features derived from sequences of pseudo-random numbers which themselves resemble noise in at least some of their characteristics. The waveform set based on the sequences is modulated digitally. The modulated set may be summed together along with a wideband reference signal of reduced amplitude and optionally an FM analog signal to form a composite signal which is broadcast typically through free space to at least one receiver. The receiver separates the analog FM signal from the digital signal and thereafter demodulates the digital data-carrying waveforms and outputs a stream of digital data. It has been determined to be resistant to multipath degradation.
Inventors
- 👤 Bill J. Hunsinger
- 👤 Derek D. Kumar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:27
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/26; H04L27/2601; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/403; H04B1/406; H04B1/69; H04B1/707; H04B1/7097; H04H; H04H20/00; H04H20/28; H04H20/33; H04J; H04J9/00; H04L5/00; H04L5/02; H04L5/023; H04H20/20; H04H20/22; H04H2201/00; H04H2201/10; H04H2201/18; H04H2201/183
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
106 words
A method for preparing data for transmission from a first location to a second location through a medium, the method comprising: modulating the data with a basis signal set to generate a plurality of modulated signals, one modulated signal for each sequence in the basis signal set, wherein the basis signal set includes a plurality of sequences of a predetermined length, each of the sequences defining a waveform representing a digital data carrier, wherein each of the waveforms has predetermined desirable autocorrelation characteristics, and wherein each of the sequences making up the basis signal set is substantially orthogonal to other sequences within the basis signal set.
Claim 2
Independent Claim
106 words
A method for preparing data for transmission from a first location to a second location through a medium, the method comprising: modulating the data with a basis signal set to generate a plurality of modulated signals, one modulated signal for each sequence in the basis signal set, wherein the basis signal set includes a plurality of sequences of a predetermined length, each of the sequences defining a waveform representing a digital data carrier, wherein each of the waveforms has predetermined desirable autocorrelation characteristics, and wherein each of the sequences making up the basis signal set is substantially orthogonal to other sequences within the basis signal set.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein each of the waveforms has an autocorrelation value approaching zero for substantially all positive and negative time shifts, and a maximum autocorrelation value for no time shift.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein a crosscorrelation/autocorrelation ratio of waveforms in the basis signal set is less than about 0.003.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein a crosscorrelation/autocorrelation ratio of waveforms in the basis signal set is less than about 0.001.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein each of the waveforms covers substantially an entire available frequency band.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein each of the waveforms occupies a finite signal bandwidth.
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein the basis signal set includes at least 48 sequences.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein each of the waveforms is spectrally shaped by a shaping function.
Claim 10
Dependent Claim
13 words
The method of claim 8 wherein the shaping function has a bandpass response.
Claim 11
Dependent Claim
25 words
The method of claim 9 wherein the bandpass response has a null at a center frequency and passbands on both sides of the center frequency.
Claim 12
Dependent Claim
29 words
The method of claim 10 wherein each of the passbands is located within a frequency band extending from about 100 KHz to about 250 KHz from the center frequency.
Claim 13
Dependent Claim
30 words
The method of claim 1 wherein each of the sequences comprises multi-value samples, each multi-value sample having a particular value selected from a set of three or more possible values.
Claim 14
Dependent Claim
14 words
The method of claim 1 wherein the sequences are generated using singular value decomposition.
Claim 15
Dependent Claim
112 words
A transmitter for transmitting data from a first location to a second location through a medium, the transmitter comprising: a modulator configured to receive the data and a basis signal set, and to modulate the data with the basis signal set to generate a plurality of modulated signals, one modulated signal for each sequence in the basis signal set, wherein the basis signal set includes a plurality of sequences of a predetermined length, each of the sequences defining a waveform representing a digital data carrier, wherein each of the waveforms has predetermined desirable autocorrelation characteristics, and wherein each of the sequences is substantially orthogonal to other sequences within the basis signal set.
Claim 16
Dependent Claim
112 words
A transmitter for transmitting data from a first location to a second location through a medium, the transmitter comprising: a modulator configured to receive the data and a basis signal set, and to modulate the data with the basis signal set to generate a plurality of modulated signals, one modulated signal for each sequence in the basis signal set, wherein the basis signal set includes a plurality of sequences of a predetermined length, each of the sequences defining a waveform representing a digital data carrier, wherein each of the waveforms has predetermined desirable autocorrelation characteristics, and wherein each of the sequences is substantially orthogonal to other sequences within the basis signal set.
Claim 17
Dependent Claim
33 words
The transmitter of claim 14 wherein each of the waveforms has an autocorrelation value approaching zero for substantially all positive and negative time shifts, and a maximum autocorrelation value for no time shift.
Claim 18
Dependent Claim
21 words
The transmitter of claim 14 wherein a crosscorrelation/autocorrelation ratio of waveforms in the basis signal set is less than about 0.003.
Claim 19
Dependent Claim
21 words
The transmitter of claim 14 wherein a crosscorrelation/autocorrelation ratio of waveforms in the basis signal set is less than about 0.001.
Claim 20
Dependent Claim
17 words
The transmitter of claim 14 wherein each of the waveforms covers substantially an entire available frequency band.
Claim 21
Dependent Claim
15 words
The transmitter of claim 14 wherein each of the waveforms occupies a finite signal bandwidth.
Claim 22
Dependent Claim
15 words
The transmitter of claim 14 wherein the basis signal set includes at least 48 sequences.
Claim 23
Dependent Claim
17 words
The transmitter of claim 14 wherein each of the waveforms is spectrally shaped by a shaping function.
Claim 24
Dependent Claim
13 words
The transmitter of claim 21 wherein the shaping function has a bandpass response.
Claim 25
Dependent Claim
25 words
The transmitter of claim 22 wherein the bandpass response has a null at a center frequency and passbands on both sides of the center frequency.
Claim 26
Dependent Claim
29 words
The transmitter of claim 23 wherein each of the passbands is located within a frequency band extending from about 100 KHz to about 250 KHz from the center frequency.
Claim 27
Dependent Claim
30 words
The transmitter of claim 14 wherein each of the sequences comprises multi-value samples, each multi-value sample having a particular value selected from a set of three or more possible values.
Claim 28
Dependent Claim
14 words
The transmitter of claim 14 wherein the sequences are generated using singular value decomposition.
References Cited (Backward Citations)
GB695353A
Cited
US3204035A
Cited
US4001702A
Cited
US4238849A
Cited
WO1979000718A1
Cited
US4281217A
Cited
US4228517A
Cited
US4379947A
Cited
US4403331A
Cited
US4476573A
Cited
WO1983002533A1
Cited
US4498195A
Cited
US4513288A
Cited
US4507746A
Cited
US4633285A
Cited
US4658296A
Cited
US4621355A
Cited
US4674121A
Cited
US4660192A
Cited
US4712240A
Cited
WO1988003342A1
Cited
EP0279349A2
Cited
US5038402A
Cited
US5073898A
Cited
US5202900A
Cited
US5133081A
Cited
EP0436875A2
Cited
US5218717A
Cited
US5136611A
Cited
US5343499A
Cited
US5103459A
Cited
US5103459B1
Cited
US5309474A
Cited
US5297033A
Cited
US5121407A
Cited
US5241562A
Cited
US5121211A
Cited
US5150377A
Cited
US5216693A
Cited
US5291289A
Cited
US5175710A
Cited
US5164959A
Cited
US5291520A
Cited
WO1992019053A1
Cited
US5278844A
Cited
US5278826A
Cited
US5222101A
Cited
US5307378A
Cited
US5239560A
Cited
US5287388A
Cited
US5249200A
Cited
US5452328A
Cited
US5210770A
Cited
US5280537A
Cited
US5282222A
Cited
US5533013A
Cited
US5465396A
Cited
US5757854A
Cited
US5850415A
Cited
US5488629A
Cited
US5285472A
Cited
US5497372A
Cited
US5436930A
Cited
US5577024A
Cited
US5442661A
Cited
US5640423A
Cited
US5588022A
Cited
US5615227A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-01-10 | 2003-07-12 | 2004-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-10 | 2007-07-12 | 2008-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-10 | 2011-07-12 | 2012-01-11 | $7700.00 | Window Closed / Lapsed |