US6320842B1
Expired / Lapsed
US
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Spread spectrum communication apparatus
Assignee: Canon Inc
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Filing: 1997-01-30
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Granted: 2001-11-20
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Expires: 2017-01-30
Abstract
Abstract In a communication apparatus of the transmitting side, n number of parallel signals are respectively spread-modulated by the n number of spreading codes and summation thereof is obtained. Also, m number of parallel signals are respectively spread-modulated by the m number of spreading codes and summation thereof is obtained. These two signals are modulated with quadrature carriers, synthesized and transmitted to the receiving side.
Inventors
- 👤 Norihiro Mochizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:39
CPC Classifications
H; H04; H04J; H04J13/00; H04J13/0077; H04B; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70706; H04J13/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
156 words
A spread spectrum communication apparatus comprising: first, second and third differential modulators, arranged for differentially encoding first, second and third data sequences into first, second and third differentially encoded data sequences; a first spread modulator arranged for spreading the first differentially encoded data sequence in accordance with a first spread code; a second spread modulator arranged for spreading the second differentially encoded data sequence in accordance with a second spread code different from the first spread code; a third spread modulator arranged for spreading the third differentially encoded data sequence in accordance with a third spread code different from the first and second spread codes; and a transmitter, arranged for transmitting an output from said first and second spread modulator, and for transmitting an output from said third spread modulator on a first phase of a carrier different from a second phase of the carrier on which an output from said first spread modulator is transmitted.
Claim 2
Dependent Claim
156 words
A spread spectrum communication apparatus comprising: first, second and third differential modulators, arranged for differentially encoding first, second and third data sequences into first, second and third differentially encoded data sequences; a first spread modulator arranged for spreading the first differentially encoded data sequence in accordance with a first spread code; a second spread modulator arranged for spreading the second differentially encoded data sequence in accordance with a second spread code different from the first spread code; a third spread modulator arranged for spreading the third differentially encoded data sequence in accordance with a third spread code different from the first and second spread codes; and a transmitter, arranged for transmitting an output from said first and second spread modulator, and for transmitting an output from said third spread modulator on a first phase of a carrier different from a second phase of the carrier on which an output from said first spread modulator is transmitted.
Claim 3
Dependent Claim
37 words
The apparatus according to claim 1 , further comprising a fourth spread modulator for spreading fourth differentially encoded data in accordance with a fourth spread code which is different from the first, second and third spread codes.
Claim 4
Dependent Claim
19 words
The apparatus according to claim 1 , wherein the first and second phases are quadrature phases of the carrier.
Claim 5
Dependent Claim
134 words
A spread spectrum communication apparatus comprising: first and second differential modulators, arranged for differentially encoding first and second transmission data in units of first and second code divided channels and forming first and second n-phase shift keying modulated signals, wherein n is a natural number; third and fourth differential modulators, arranged for differentially encoding third and fourth transmission data in units of third and fourth code divided channels and forming first and second π/n-shifted n-phase shift keying modulated signals; first, second, third and fourth spread modulators, arranged for spreading the first and second n-phase shift keying modulated signals and the first and second π/n-shifted n-phase shift keying modulated signals using corresponding spread codes different from each other; and a transmitter, arranged for transmitting an output from said first, second, third and fourth spread modulators.
Claim 6
Dependent Claim
134 words
A spread spectrum communication apparatus comprising: first and second differential modulators, arranged for differentially encoding first and second transmission data in units of first and second code divided channels and forming first and second n-phase shift keying modulated signals, wherein n is a natural number; third and fourth differential modulators, arranged for differentially encoding third and fourth transmission data in units of third and fourth code divided channels and forming first and second π/n-shifted n-phase shift keying modulated signals; first, second, third and fourth spread modulators, arranged for spreading the first and second n-phase shift keying modulated signals and the first and second π/n-shifted n-phase shift keying modulated signals using corresponding spread codes different from each other; and a transmitter, arranged for transmitting an output from said first, second, third and fourth spread modulators.
Claim 7
Dependent Claim
29 words
The apparatus according to claim 4 , wherein said transmitter transmits the output from said first, second, third and fourth spread modulators on a quadrature phase of a carrier.
Claim 8
Dependent Claim
105 words
A spread spectrum communication apparatus comprising: a differential modulator for encoding first, second and third transmission data into first and second differentially encoded data; and a spread modulator for spreading the first differentially encoded data in accordance with a first spreading code and spreading the second differentially encoded data in accordance with a second spreading code, wherein said differential modulator encodes the first, second and third transmission data such that a difference between the first and second transmission data is encoded into the first differentially encoded data and a difference between the second and third transmission data is encoded into the second differentially encoded data.
Claim 9
Dependent Claim
105 words
A spread spectrum communication apparatus comprising: a differential modulator for encoding first, second and third transmission data into first and second differentially encoded data; and a spread modulator for spreading the first differentially encoded data in accordance with a first spreading code and spreading the second differentially encoded data in accordance with a second spreading code, wherein said differential modulator encodes the first, second and third transmission data such that a difference between the first and second transmission data is encoded into the first differentially encoded data and a difference between the second and third transmission data is encoded into the second differentially encoded data.
Claim 10
Dependent Claim
57 words
An apparatus according to claim 6 , further comprising a transmitter, arranged for transmitting the first differentially encoded data spread in accordance with the first spreading code via a first phase of a carrier and for transmitting the second differentially encoded data spread in accordance with the second spreading code via a second phase of the carrier.
Claim 11
Dependent Claim
19 words
An apparatus according to claim 7 , wherein the first and second phases are quadrature phases of the carrier.
Claim 12
Independent Claim
104 words
A method for a spread spectrum communication, comprising the steps of: encoding first, second and third transmission data into first and second differentially encoded data; and spreading the first differentially encoded data in accordance with a first spreading code and spreading the second differentially encoded data in accordance wiht a second spreading code, wherein the first, second and third transmission data are encoded in said encoding step such that a difference between the first and second transmission data is encoded into the first differentially encoded data and a difference between the second and third transmission data is encoded into the second differentially encoded data.
Claim 13
Independent Claim
104 words
A method for a spread spectrum communication, comprising the steps of: encoding first, second and third transmission data into first and second differentially encoded data; and spreading the first differentially encoded data in accordance with a first spreading code and spreading the second differentially encoded data in accordance wiht a second spreading code, wherein the first, second and third transmission data are encoded in said encoding step such that a difference between the first and second transmission data is encoded into the first differentially encoded data and a difference between the second and third transmission data is encoded into the second differentially encoded data.
Claim 14
Dependent Claim
53 words
A method according to claim 9 , wherein the first differentially encoded data spread in accordance with the first spreading code is transmitted via a first phase of a carrier and the second differentially encoded data spread in accordance with the second spreading code is transmitted via a second phase of the carrier.
Claim 15
Dependent Claim
19 words
A method according to claim 10 , wherein the first and second phases are quadrature phases of the carrier.
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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) | 2004-11-19 | 2005-05-21 | 2005-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-11-19 | 2009-05-21 | 2009-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-11-19 | 2013-05-21 | 2013-11-20 | $7700.00 | Window Closed / Lapsed |