US3619501A
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Multiphase modulated transmission encoder
Assignee: International Business Machines Corp
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Filing: 1970-06-18
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Granted: 1971-11-09
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Expires: 1990-06-18
Abstract
Abstract A multiphase modulated transmission can be obtained with three data sets X, Y, and Z such that data elements of the set Y+Z drive two phase channels and data elements from the set Y1+Z1, derived from the three sets X, Y, Z and selected according to a predetermined logical function, drive two other phase channels. By adjusting the weighting of algebraic adders terminating corresponding channel pairs, multiphases up to eight can be approximated.
Inventors
- 👤 Henri J Nussbaumer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:45
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/497
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
In a data transmission system of the phase-modulation type using carrier signals of frequency n and in which a series of weighted pulses approximating the function are used to represent individual ones of a sequence of data elements occurring at data rate 1/T and partitionable into two sets, for example, X, Y, Z; the combination comprising: means for deriving a first signal group Y+Z from the data elements of the sets Y and Z; means for deriving a second signal group Y1+Z1 from the data elements of the sets X, Y, and Z according to the relations: Y1 XY+XY and Z1 XZ+ZX; means for modulating each first signal group data element by a signal of the form and for modulating each second group data element by a signal of the form and for modulating each second group data element by a signal of the form where q and q1 are magnitudes corresponding to the signal grOup data element values and and means for combining said modulated signals summed over the signal space i and defined as
Claim 2
Dependent Claim
176 words
In a data transmission system of the phase-modulation type using carrier signals of frequency n and in which a series of weighted pulses approximating the function are used to represent individual ones of a sequence of data elements occurring at data rate 1/T and partitionable into two sets, for example, X, Y, Z; the combination comprising: means for deriving a first signal group Y+Z from the data elements of the sets Y and Z; means for deriving a second signal group Y1+Z1 from the data elements of the sets X, Y, and Z according to the relations: Y1 XY+XY and Z1 XZ+ZX; means for modulating each first signal group data element by a signal of the form and for modulating each second group data element by a signal of the form and for modulating each second group data element by a signal of the form where q and q1 are magnitudes corresponding to the signal grOup data element values and and means for combining said modulated signals summed over the signal space i and defined as
Claim 3
Dependent Claim
22 words
In a transmission system according to claim 1, wherein the modulating means assign the magnitude 0.7 for q and 0.3 for q1.
Claim 4
Dependent Claim
175 words
In a system for encoding a sequence of data elements a, b, c, d, e, etc., occurring at data rate 1/T with corresponding signals of a general form and further modulating a carrier of frequency n, the data elements being partitionable into sets such that, for example, set X includes a, d, g, etc., set Y includes b, e, h, etc., and Z includes c, f, i, etc., the combination comprising: means for deriving a first signal group Y+Z from the data elements from the sets Y and Z; means for deriving a second signal group Y1+Z1 from the data elements from sets X, Y and Z according to the relation Y1 XY+XY and Z1 XZ+ZX; means for modulating each first signal group data element by a signal of the form and for modulating each second group data element by a signal of the form where q and q1 are assigned the respective magnitudes of 0.7 and 0.3 and and means for combining said modulated signals summed over the signal space i and defined as
Claim 5
Dependent Claim
175 words
In a system for encoding a sequence of data elements a, b, c, d, e, etc., occurring at data rate 1/T with corresponding signals of a general form and further modulating a carrier of frequency n, the data elements being partitionable into sets such that, for example, set X includes a, d, g, etc., set Y includes b, e, h, etc., and Z includes c, f, i, etc., the combination comprising: means for deriving a first signal group Y+Z from the data elements from the sets Y and Z; means for deriving a second signal group Y1+Z1 from the data elements from sets X, Y and Z according to the relation Y1 XY+XY and Z1 XZ+ZX; means for modulating each first signal group data element by a signal of the form and for modulating each second group data element by a signal of the form where q and q1 are assigned the respective magnitudes of 0.7 and 0.3 and and means for combining said modulated signals summed over the signal space i and defined as
Claim 6
Independent Claim
143 words
A method for phase-modulating data elements a, b, c, d, e, etc., serially occurring at data rate 1/T upon a carrier signal of frequency n, comprising the steps of: partitioning the data elements into sets such as X including data elements a, d, g, etc.; Y including data elements b, e, h, etc.; and Z including data elements c, f, i, etc.; forming a first disjunctive set Y+Z; forming a second disjunctive set Y1+Z1, where Y1 XY+ XY and Z1 XZ+ZX; modulating each data element of the first disjunctive set by a signal of the form and for modulating each data element of the second disjunctive set by a signal of the form where qj and qj1 are magnitudes corresponding to the jth data element value and summing over the ith signal space the modulated signals so as to form the composite signal
Claim 7
Independent Claim
143 words
A method for phase-modulating data elements a, b, c, d, e, etc., serially occurring at data rate 1/T upon a carrier signal of frequency n, comprising the steps of: partitioning the data elements into sets such as X including data elements a, d, g, etc.; Y including data elements b, e, h, etc.; and Z including data elements c, f, i, etc.; forming a first disjunctive set Y+Z; forming a second disjunctive set Y1+Z1, where Y1 XY+ XY and Z1 XZ+ZX; modulating each data element of the first disjunctive set by a signal of the form and for modulating each data element of the second disjunctive set by a signal of the form where qj and qj1 are magnitudes corresponding to the jth data element value and summing over the ith signal space the modulated signals so as to form the composite signal
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |