Patent US4211996A successfully refreshed from Google Patents.
US4211996A
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Error correction system for differential phase-shift-keying
Assignee: NEC Corp
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Filing: 1978-07-19
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Granted: 1980-07-08
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Expires: 1998-07-19
Abstract
Abstract An error correcting system for DPSK is comprised of an encoder unit, a decoder unit and a transmission medium disposed between the encoder and decoder units. The encoder includes a differential encoder for differentially encoding an input data sequence, an error correcting encoder for adding a check digit sequence to the differentially encoded data sequence, and a differential decoder for differentially decoding the data sequence added with the check digit sequence. The decoder unit includes a differential encoder for differentially encoding a received data sequences, an error correcting decoder for correcting error digits contained in the differentially encoded received data sequence, and a differential decoder for differentially decoding the output data sequence from the error correcting decoder. The transmission medium typically includes a differentially encoded phase-shifting-keying modulator unit and a differentially encoded phase-shift-keying demodulator unit.
Inventors
- 👤 Katsuhiro Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:17
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
An error correcting system for differential phase-shift-keying comprising an encoder unit including a differential encoder for differentially encoding an input data sequence, an error correcting encoder for adding a check digit sequence to the differentially encoded data sequence, and a differential decoder for differentially decoding the data sequence added with the check digit sequence; a decoder unit including a differential encoder for differentially encoding a received data sequence, an error correcting decoder for correcting error digits contained in the differentially encoded received data sequence, and a differential decoder for differentially decoding the output data sequence from the error correcting decoder; and a transmission medium disposed between said encoder and decoder units and including a differentially encoded phase-shift-keying modulator unit and a differentially encoded phase-shift-keying demodulator unit.
Claim 2
Dependent Claim
126 words
An error correcting system for differential phase-shift-keying comprising an encoder unit including a differential encoder for differentially encoding an input data sequence, an error correcting encoder for adding a check digit sequence to the differentially encoded data sequence, and a differential decoder for differentially decoding the data sequence added with the check digit sequence; a decoder unit including a differential encoder for differentially encoding a received data sequence, an error correcting decoder for correcting error digits contained in the differentially encoded received data sequence, and a differential decoder for differentially decoding the output data sequence from the error correcting decoder; and a transmission medium disposed between said encoder and decoder units and including a differentially encoded phase-shift-keying modulator unit and a differentially encoded phase-shift-keying demodulator unit.
Claim 3
Dependent Claim
51 words
An error correcting encoder unit for differential phase-shift-keying including: a differential encoder for differentially encoding an input data sequence; an error correcting encoder for adding a check digit sequence to the differentially encoded data sequence; and a differential decoder for differentially decoding the data sequence added with the check digit sequence.
Claim 4
Dependent Claim
51 words
An error correcting encoder unit for differential phase-shift-keying including: a differential encoder for differentially encoding an input data sequence; an error correcting encoder for adding a check digit sequence to the differentially encoded data sequence; and a differential decoder for differentially decoding the data sequence added with the check digit sequence.
Claim 5
Dependent Claim
52 words
An error correcting decoder unit for differential phase-shift-keying including: a differential encoder for differentially encoding a received data sequence; an error correcting decoder for correcting error digits contained in the differentially encoded received data sequence; and a differential decoder for differentially decoding the output data sequence given from the error correcting decoder.
Claim 6
Dependent Claim
52 words
An error correcting decoder unit for differential phase-shift-keying including: a differential encoder for differentially encoding a received data sequence; an error correcting decoder for correcting error digits contained in the differentially encoded received data sequence; and a differential decoder for differentially decoding the output data sequence given from the error correcting decoder.
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) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |