Patent US3887768A successfully refreshed from Google Patents.
US3887768A
Expired / Lapsed
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Signal structures for double side band-quadrature carrier modulation
Assignee: Motorola Solutions Inc
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Filing: 1971-09-14
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Granted: 1975-06-03
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Expires: 1991-09-14
Abstract
Abstract Double side band-quadrature carrier modulation signal points are mapped on the complex plane are drawn from an alphabet consisting of at least 8 points, and are set up in concentric rings each rotated by 45* with respect to adjacent rings. Differential encoding is shown encoding the phase components of the transmitted signals.
Inventors
- 👤 Jr George David Forney
- 👤 Robert G Gallager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:32
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/02; H04L27/32; H04L27/34; H04L27/3405; H04L27/3411
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A double side band-quadrature carrier modulation system comprising input means for receiving a sequence of symbols ak at a rate 1/T per second. coding means connected to said input means for providing from said symbbols a sequence of complex valued signal points dk drawn froM an alphabet comprising M points arranged in a multiplicity of concentric rings in the complex plane including an innermost ring having four equally spaced points and a plurality of additional rings each having four equally spaced points, each said ring being rotated by 45* with respect to adjacent said rings, and modulating means connected to said coding means for providing from said signal points a signal in the form
Claim 2
Dependent Claim
114 words
A double side band-quadrature carrier modulation system comprising input means for receiving a sequence of symbols ak at a rate 1/T per second. coding means connected to said input means for providing from said symbbols a sequence of complex valued signal points dk drawn froM an alphabet comprising M points arranged in a multiplicity of concentric rings in the complex plane including an innermost ring having four equally spaced points and a plurality of additional rings each having four equally spaced points, each said ring being rotated by 45* with respect to adjacent said rings, and modulating means connected to said coding means for providing from said signal points a signal in the form
Claim 3
Dependent Claim
114 words
A double side band-quadrature carrier modulation system comprising input means for receiving a sequence of symbols ak at a rate 1/T per second. coding means connected to said input means for providing from said symbbols a sequence of complex valued signal points dk drawn froM an alphabet comprising M points arranged in a multiplicity of concentric rings in the complex plane including an innermost ring having four equally spaced points and a plurality of additional rings each having four equally spaced points, each said ring being rotated by 45* with respect to adjacent said rings, and modulating means connected to said coding means for providing from said signal points a signal in the form
Claim 4
Dependent Claim
114 words
A double side band-quadrature carrier modulation system comprising input means for receiving a sequence of symbols ak at a rate 1/T per second. coding means connected to said input means for providing from said symbbols a sequence of complex valued signal points dk drawn froM an alphabet comprising M points arranged in a multiplicity of concentric rings in the complex plane including an innermost ring having four equally spaced points and a plurality of additional rings each having four equally spaced points, each said ring being rotated by 45* with respect to adjacent said rings, and modulating means connected to said coding means for providing from said signal points a signal in the form
Claim 5
Dependent Claim
28 words
The system of claim 1 wherein said coding means includes means for effectively providing said signal points arranged in at least four concentric rings in the complex plane.
Claim 6
Dependent Claim
30 words
The system of claim 2 wherein said coding means includes means for causing the innermost four said rings to have radii in the ratio Square Root 2:3:3 Square Root 2:5.
Claim 7
Dependent Claim
31 words
The system of claim 1 wherein said coding means includes means for causing the phase component of each dk to depend upon ak and upon the phase component of d(k 1).
Claim 8
Dependent Claim
25 words
The system of claim 1 wherein said coding means includes means for causing each said dk to have integer valued coordinates in the complex plane.
Claim 9
Dependent Claim
122 words
A double side band-quadrature carrier modulation system comprising input means for receiving a sequence of symbols ak at a rate 1/T per second, coding means connected to said input means for providing from said symbols a sequence of complex valued signal points dk drawn from an alphabet comprising M points arranged in a multiplicity of concentric rings in the complex plane including an innermost ring having four equally spaced points and a plurality of additional rings having four equally spaced points, each said ring being rotated by 45* with respect to adjacent said rings, and filtering means connected to said coding means for providing from said signal points the real and imaginary parts of a complex valued baseband signal in the form
Claim 10
Dependent Claim
122 words
A double side band-quadrature carrier modulation system comprising input means for receiving a sequence of symbols ak at a rate 1/T per second, coding means connected to said input means for providing from said symbols a sequence of complex valued signal points dk drawn from an alphabet comprising M points arranged in a multiplicity of concentric rings in the complex plane including an innermost ring having four equally spaced points and a plurality of additional rings having four equally spaced points, each said ring being rotated by 45* with respect to adjacent said rings, and filtering means connected to said coding means for providing from said signal points the real and imaginary parts of a complex valued baseband signal in the form
Claim 11
Dependent Claim
95 words
A double side band-quadrature carrier modulation method comprising receiving a sequence of symbols ak at a rate 1/T per second providing from said symbols a sequence of complex valued signal points dk drawn from an alphabet comprising M points arranged in a multiplicity of concentric rings in the complex plane including an innermost ring having four equally spaced points and a plurality of additional rings each having four equally spaced points, each said ring being rotated by 45* with respect to adjacent said rings, and providing from said signal points a signal in the form
Claim 12
Dependent Claim
95 words
A double side band-quadrature carrier modulation method comprising receiving a sequence of symbols ak at a rate 1/T per second providing from said symbols a sequence of complex valued signal points dk drawn from an alphabet comprising M points arranged in a multiplicity of concentric rings in the complex plane including an innermost ring having four equally spaced points and a plurality of additional rings each having four equally spaced points, each said ring being rotated by 45* with respect to adjacent said rings, and providing from said signal points a signal in the form
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |