US5654978A
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US
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Pulse position modulation with spread spectrum
Assignee: Micron Technology Inc
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Filing: 1993-11-01
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Granted: 1997-08-05
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Expires: 2013-11-01
Abstract
Abstract A method of pulse-position modulation in a spread-spectrum communication system, which is capable of transmitting more than one bit per received and recognized chip sequence in a system in which an entire chip sequence is required to produce a correlation pulse. A framing pulse window in which a framing pulse may be received, and a plurality of data pulse windows in which a data pulse may (or may not) be received. The delay between the framing pulse window and the first data pulse window may comprise an entire chip-sequence duration, while the delay from one data pulse window to the next may be less. A method of pulse-position modulation with more than one spread-spectrum code. A second transmission medium (such as a second spread-spectrum code) on which a data pulse may (or may not) be received. Each possible choice, for the data pulse, of delay time and transmission code may represent a separate set of multiple data bits. A method of transmitting signals in a spread-spectrum communication system in which a spread-spectrum chip sequence may be interrupted with reduced noise. The system may ground the transmitter antenna at the end of a chip sequence when it is desired to delay transmission of the next chip sequence.
Inventors
- 👤 Jeffrey S. Vanderpool
- 👤 Ryan N. Jensen
- 👤 Pete O. Peterson
- 👤 Michael Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:01
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B14/00; H04B14/02; H04B14/026
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
94 words
A method of coherent communication, comprising the steps of transmitting, in each of a plurality of timing windows, a first spread-spectrum pulse during a predefined framing pulse window, said timing windows being of equal time duration; selecting, in each of said plurality of timing windows, one of a plurality of data pulse windows, responsive to at least one data bit associated with a particular one of said timing windows; and transmitting a second spread-spectrum pulse during the selected data pulse window, said second spread-spectrum pulse indicative of one or more bits of serial data.
Claim 2
Independent Claim
94 words
A method of coherent communication, comprising the steps of transmitting, in each of a plurality of timing windows, a first spread-spectrum pulse during a predefined framing pulse window, said timing windows being of equal time duration; selecting, in each of said plurality of timing windows, one of a plurality of data pulse windows, responsive to at least one data bit associated with a particular one of said timing windows; and transmitting a second spread-spectrum pulse during the selected data pulse window, said second spread-spectrum pulse indicative of one or more bits of serial data.
Claim 3
Dependent Claim
25 words
A method as in claim 1, wherein said first spread-spectrum pulse and said second spread spectrum pulse are generated from the same spread spectrum code.
Claim 4
Dependent Claim
24 words
A method as in claim 1, wherein said first spread-spectrum pulse and said second spread spectrum pulse are generated from different spread spectrum codes.
Claim 5
Dependent Claim
41 words
A method as in claim 1, further comprising the steps of selecting a second one of said data pulse windows, responsive to said at least one data bit, and transmitting a third spread-spectrum pulse during said second selected data pulse window.
Claim 6
Independent Claim
100 words
A method of communication, comprising the steps of transmitting, in each of a plurality of timing windows of equal time duration, a first entire spread-spectrum chip sequence timed to end during a predefined framing pulse window; selecting, in each of said plurality of timing windows, one of a plurality of data pulse windows, responsive to at least one data bit associated with a particular one of said timing windows; and transmitting a second entire spread-spectrum chip sequence timed to end during the selected data pulse window, said second spread-spectrum chip sequence indicative of one or more bits of serial data.
Claim 7
Independent Claim
100 words
A method of communication, comprising the steps of transmitting, in each of a plurality of timing windows of equal time duration, a first entire spread-spectrum chip sequence timed to end during a predefined framing pulse window; selecting, in each of said plurality of timing windows, one of a plurality of data pulse windows, responsive to at least one data bit associated with a particular one of said timing windows; and transmitting a second entire spread-spectrum chip sequence timed to end during the selected data pulse window, said second spread-spectrum chip sequence indicative of one or more bits of serial data.
Claim 8
Independent Claim
140 words
A system for spread-spectrum communication, comprising a plurality of timing windows of equal time duration, a predefined framing pulse window in each of said timing windows, during which a spread-spectrum framing pulse is received; a plurality of data pulse windows in each of said timing windows, during each of which a data pulse may be received or not received, wherein receipt of a data pulse in any of said data pulse windows is indicative of a first set of information, and failure to receive a data pulse in any of said data pulse windows is indicative of a second set of information, said first set of information and said second set of information each comprising one or more data bits, a first one of said data pulse windows being offset from said framing pulse window by a predetermined time duration.
Claim 9
Independent Claim
140 words
A system for spread-spectrum communication, comprising a plurality of timing windows of equal time duration, a predefined framing pulse window in each of said timing windows, during which a spread-spectrum framing pulse is received; a plurality of data pulse windows in each of said timing windows, during each of which a data pulse may be received or not received, wherein receipt of a data pulse in any of said data pulse windows is indicative of a first set of information, and failure to receive a data pulse in any of said data pulse windows is indicative of a second set of information, said first set of information and said second set of information each comprising one or more data bits, a first one of said data pulse windows being offset from said framing pulse window by a predetermined time duration.
Claim 10
Dependent Claim
19 words
A system as in claim 6, wherein said data pulse is generated by correlation of a spread spectrum code.
Claim 11
Dependent Claim
30 words
A system as in claim 6, wherein said first one of said data pulse windows is offset from said framing pulse window by at least an entire spread-spectrum chip sequence.
Claim 12
Independent Claim
87 words
A system for spread-spectrum communication, comprising a plurality of timing windows of equal time duration, a predefined framing pulse window in each of said timing windows, during which a spread-spectrum framing pulse is received; a plurality of data pulse windows in each of said timing windows, during each of which a data pulse may be received or not received; each one of said plurality of data pulse windows being offset from said framing pulse window by a predetermined time duration specific to said one data pulse window.
Claim 13
Independent Claim
87 words
A system for spread-spectrum communication, comprising a plurality of timing windows of equal time duration, a predefined framing pulse window in each of said timing windows, during which a spread-spectrum framing pulse is received; a plurality of data pulse windows in each of said timing windows, during each of which a data pulse may be received or not received; each one of said plurality of data pulse windows being offset from said framing pulse window by a predetermined time duration specific to said one data pulse window.
Claim 14
Dependent Claim
19 words
A system as in claim 9, wherein said data pulse is generated by correlation of a spread spectrum code.
Claim 15
Dependent Claim
32 words
A system as in claim 9, wherein a first one of said plurality of data pulse windows is offset from said framing pulse window by at least an entire spread-spectrum chip sequence.
Claim 16
Dependent Claim
45 words
A system as in claim 9, wherein said plurality of data pulse windows comprises a first and a second data pulse window, and wherein said second data pulse window is offset from said first data pulse window by less than an entire spread-spectrum chip sequence.
Claim 17
Independent Claim
98 words
A system for communication, comprising a timing window; a predefined framing pulse window within said timing window, during which a first spread-spectrum signal is received; and a plurality of predefined data pulse windows within said timing window, said data pulse windows following said framing pulse window, wherein receipt of a second spread-spectrum signal during a selected one of said data pulse windows is indicative of a first plurality of serial data bits, and wherein failure to receive said second spread-spectrum signal during one of said data pulse windows is indicative of a second plurality of serial data bits.
Claim 18
Independent Claim
98 words
A system for communication, comprising a timing window; a predefined framing pulse window within said timing window, during which a first spread-spectrum signal is received; and a plurality of predefined data pulse windows within said timing window, said data pulse windows following said framing pulse window, wherein receipt of a second spread-spectrum signal during a selected one of said data pulse windows is indicative of a first plurality of serial data bits, and wherein failure to receive said second spread-spectrum signal during one of said data pulse windows is indicative of a second plurality of serial data bits.
Claim 19
Dependent Claim
30 words
A system as in claim 13, wherein a relationship of a number of said data pulse windows M to a number of said data bits N is N≦log 2 M.
Claim 20
Dependent Claim
22 words
A system as in claim 13, wherein said first spread-spectrum signal and said second spread-spectrum signal comprise the same spread spectrum code.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-08-04 | 2001-02-03 | 2001-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-04 | 2005-02-03 | 2005-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-04 | 2009-02-03 | 2009-08-05 | $7700.00 | Window Closed / Lapsed |