US3818346A
Expired / Lapsed
US
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Differential phase-shift-keyed signal resolver
Assignee: Individual
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Filing: 1972-10-12
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Granted: 1974-06-18
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Expires: 1992-10-12
Abstract
Abstract A differential phase shift keyed (DPSK) signal resolver resolves the differential phase shift in the incoming signal to determine the data content thereof overcoming phase uncertainty without requiring a transmitted reference signal.
Inventors
- 👤 J Fletcher
- 👤 P Hopkins
- 👤 W Wallingford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:23
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/227; H04L27/2275; H04L27/2276
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
A quadriphase differential phase-shift-keyed signal receiver responding to phase shifts in an incoming signal to provide output data bits, comprising: a. means for deriving a local phase reference signal from the incoming signal; b. phase detector means for demodulating the incoming signal by the local phase reference signal to form a phase status signal; c. decision logic means responsive to said phase detector means for forming phase change signals indicating output data bits by decoding the phase status signal, said decision-logic means comprising; d. means for storing the phase status signal formed during the preceding reception interval; e. transition logic means for detecting changes in the phase status signal currently formed from the stored phase status signal; and f. resolver logic means for forming output Signals indicating data bits based on changes in the phase status signal detected by said transition logic means.
Claim 2
Dependent Claim
143 words
A quadriphase differential phase-shift-keyed signal receiver responding to phase shifts in an incoming signal to provide output data bits, comprising: a. means for deriving a local phase reference signal from the incoming signal; b. phase detector means for demodulating the incoming signal by the local phase reference signal to form a phase status signal; c. decision logic means responsive to said phase detector means for forming phase change signals indicating output data bits by decoding the phase status signal, said decision-logic means comprising; d. means for storing the phase status signal formed during the preceding reception interval; e. transition logic means for detecting changes in the phase status signal currently formed from the stored phase status signal; and f. resolver logic means for forming output Signals indicating data bits based on changes in the phase status signal detected by said transition logic means.
Claim 3
Dependent Claim
34 words
The structure of claim 1, wherein said transition logic means comprises: logic circuit means for forming an output signal when the phase status signal currently being formed changes from the stored phase status signal.
Claim 4
Dependent Claim
28 words
The structure of claim 1, wherein said transition logic means comprises: logic circuit means for forming output signals indicating each of four states of the phase status signal.
Claim 5
Dependent Claim
37 words
The structure of claim 3, wherein said resolver logic means comprises: means for forming pairs of output data bits in response to changes of the phase status signal between the four states of the phase status signal.
Claim 6
Dependent Claim
66 words
The structure of claim 1, wherein the status signal changes between one of four phase states in accordance with the data content of the incoming signal and further including: a. means for phase shifting the local reference signal to form a first local phase reference signal; and means for forming a second local phase reference signal in phase quadrature with said first local phase reference signal.
Claim 7
Dependent Claim
58 words
The structure of claim 5, wherein said phase detector means comprises: a. first detector means for demodulating the incoming signal with the first local phase reference signal to form a first phase status signal; and b. second detector means for demodulating the incoming signal with the second local phase reference signal to form a second phase status signal.
Claim 8
Dependent Claim
85 words
The structure of claim 6, wherein changes in the first and second phase status signals between successive reception intervals indicate data in the incoming signal and wherein said decision logic means comprises: a. first logic means for comparing the first phase status signal currently being formed with the first phase status signal received during the preceding reception interval; and b. second logic means for comparing the second phase status signal currently being formed with the second phase status signal received during the preceding reception interval.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |