US4866735A
Expired / Lapsed
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Spread spectrum communicating method
Assignee: Faurecia Clarion Electronics Co Ltd
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Filing: 1988-07-21
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Granted: 1989-09-12
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Expires: 2008-07-21
Abstract
Abstract A spread spectrum communicating method does not use as a spreading code a normal PN code having a code length of an add number of chips in the original form, but uses a PN code having a code length of an even number of chips obtained by adding or subtracting a code of a predetermined number of chips to or from the original PN code to use it as the spreading code.
Inventors
- 👤 Masaharu Mori
- 👤 Masahiro Hamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:56
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/70712
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
In a spread spectrum communicating method including steps that a transmitter transmits a spread spectrum signal obtained by multiplication of a spreading code and an information signal and that a receiver correlates the received spread spectrum signal with a spreading code generated therein, using a correlator made from a convolver, to obtain a correlation spike signal, and demodulates data from a signal obtained by integrating the correlation spike signal for a predetermined period in response to a PN clock signal for generating the spreading code, an improvement wherein said spreading code is a PN code having a code length of an even number of chips.
Claim 2
Dependent Claim
105 words
In a spread spectrum communicating method including steps that a transmitter transmits a spread spectrum signal obtained by multiplication of a spreading code and an information signal and that a receiver correlates the received spread spectrum signal with a spreading code generated therein, using a correlator made from a convolver, to obtain a correlation spike signal, and demodulates data from a signal obtained by integrating the correlation spike signal for a predetermined period in response to a PN clock signal for generating the spreading code, an improvement wherein said spreading code is a PN code having a code length of an even number of chips.
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) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |