US4847861A
Expired / Lapsed
US
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Maximum length linearly occurring code sequence generator in a spread spectrum communication system
Assignee: Faurecia Clarion Electronics Co Ltd
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Filing: 1987-08-13
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Granted: 1989-07-11
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Expires: 2007-08-13
Abstract
Abstract A method for determining the initial state of shift registers constituting a modular type or simple construction type maximum length linearly occurring code sequence generator used in a spread spectrum communication system is disclosed, by which it is determined by the following equation; ##EQU1## where yj(0) is the j-th element of Y (0), and X=P X (0).
Inventors
- 👤 Masahiro Hamatsu
- 👤 Masaharu Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:19
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; G; G06; G06F; G06F7/00; G06F7/58; G06F7/582; G06F7/584; G06F2207/00; G06F2207/58; G06F2207/581
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
A spread spectrum communication system, by which demodulation of necessary information is effected by correlation output between signals for which spectrum of information signals is spread by using a maximum length linearly occurring code sequence on the sender side and a maximum length linearly occurring code sequence generated on the receiver side, wherein the initial state of shift registers constituting the maximum length linearly occurring code sequence generator is determined by the following equation; ##EQU11## j=1, . . . , n where yj(0) is the j-th element of Y(O), X is the j-th row, and X=PX(O).
Claim 2
Dependent Claim
96 words
A spread spectrum communication system, by which demodulation of necessary information is effected by correlation output between signals for which spectrum of information signals is spread by using a maximum length linearly occurring code sequence on the sender side and a maximum length linearly occurring code sequence generated on the receiver side, wherein the initial state of shift registers constituting the maximum length linearly occurring code sequence generator is determined by the following equation; ##EQU11## j=1, . . . , n where yj(0) is the j-th element of Y(O), X is the j-th row, and X=PX(O).
Claim 3
Dependent Claim
128 words
A spread spectrum communication system according to claim 1, wherein said maximum length linearly occurring code sequence generator includes a plurality of flip-flops which each have a data input and a data output, and a plurality of exclusive OR gates which each have first and second data inputs and a data output, a first of said flip-flops having its data output coupled to said first data input of each said gate and to the data input of a second of said flip-flops, each said gate having its second data input coupled to the data output of a respective said flip-flop other than said first flip-flop, and each said gate having its data output coupled to the data input of a respective said flip-flop other than said second flip-flop.
Claim 4
Dependent Claim
163 words
A spread spectrum communication system according to claim 1, wherein said maximum length linearly occurring code sequence generator includes a plurality of flip-flops which each have a data input and a data output, and a plurality of exclusive OR gates which each have first and second data inputs and a data output, a first said flip-flop having its data output coupled to the first data input of a first said gate, a second said gate having its data output coupled to the data input of a second said flip-flop, each said flip-flop other than said first flip-flop having its data output coupled to the second data input of a respective one of said gates and coupled to the data input of a respective one of said flip-flops other than said second flip-flop, and each said gate other than said second gate having its data output coupled to the first data input of a respective one of said gates other than said first gate.
References Cited (Backward Citations)
US4320513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |