US4862479A
Expired / Lapsed
US
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Spread spectrum communication system
Assignee: Faurecia Clarion Electronics Co Ltd
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Filing: 1987-10-09
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Granted: 1989-08-29
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Expires: 2007-10-09
Abstract
Abstract In a spread spectrum communication system, in which correlation output is obtained by giving a correlator a sender side output code and a receiver side output code, communication channels obtained by dividing the whole channel by using GOLD codes as the sender and receiver side output codes are used and the GOLD codes are constructed by adding preferred pairs of the two m sequences modulo 2.
Inventors
- 👤 Masahiro Hamatsu
- 👤 Takao Kurihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:28
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/70712; H04B1/709
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
A GOLD code generating system used in a spread spectrum communication system, in which a correlation output is obtained by giving a correlator a sender side output code and a receiver side output code, comprising: means for generating a first m sequence u and a second m sequence v at the sender side; sender side control means for generating a sender side GOLD code which is a spreading code and which is an element of a set of GOLD codes G(u,v) where G(U,v)={u,v,u⊕v,u⊕Tv, . . . , u⊕T.sup.N-1 v} and where T: state transition matrix of v N: code length of each sequence in G(u,v); means for generating image codes u and vof said first and second m sequences at the receiver side; and receiver side control means for generating a receiver side GOLD code which is a spreading code and which is an element of a set of GOLD codes G(u,v) where G(u,v)={u,v,u⊕v,u⊕T.sup.N-1 v, . . . , u⊕Tv}.
Claim 2
Dependent Claim
160 words
A GOLD code generating system used in a spread spectrum communication system, in which a correlation output is obtained by giving a correlator a sender side output code and a receiver side output code, comprising: means for generating a first m sequence u and a second m sequence v at the sender side; sender side control means for generating a sender side GOLD code which is a spreading code and which is an element of a set of GOLD codes G(u,v) where G(U,v)={u,v,u⊕v,u⊕Tv, . . . , u⊕T.sup.N-1 v} and where T: state transition matrix of v N: code length of each sequence in G(u,v); means for generating image codes u and vof said first and second m sequences at the receiver side; and receiver side control means for generating a receiver side GOLD code which is a spreading code and which is an element of a set of GOLD codes G(u,v) where G(u,v)={u,v,u⊕v,u⊕T.sup.N-1 v, . . . , u⊕Tv}.
Claim 3
Dependent Claim
36 words
A system according to claim 1, including a surface acoustic wave convolver which is said correlator and has two inputs to which are respectively applied said sender side GOLD code and said receiver side GOLD code.
References Cited (Backward Citations)
US4538281A
Cited
US4689626A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |