US4827489A
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Decoding device for digital signals
Assignee: Hitachi Ltd
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Filing: 1987-05-01
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Granted: 1989-05-02
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Expires: 2007-05-01
Abstract
Abstract A device for decoding coded digital signals for every symbol consisting of a plurality of binary signals comprises first circuit for generating a first reliability for every binary signal; hard decided from the received or reproduced signal, in the symbol and second circuit for generating a second reliability for every symbol consisting of n binary signals on the basis of the first reliability, whereby decoding processing e.g. soft decision decoding is effected for every signal, depending on the second reliability.
Inventors
- 👤 Nobukazu Doi
- 👤 Hideki Imai
- 👤 Morishi Izumita
- 👤 Seiichi Mita
- 👤 Akira Saito
- 👤 Hiroto Yamauchi
- 👤 Mamoru Kaneko
- 👤 Tetsuya Amano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:04
CPC Classifications
H; H04; H04L; H04L1/00; H03; H03M; H03M13/00; H03M13/37; H03M13/45
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
A device for decoding coded digital signals for every symbol consisting of a plurality of binary signals comprising: first means for generating a respective first reliability for every binary signal; hard decided from the received or reproduced signal, in said symbol; second means for generating a second reliability for each symbol on the basis of said first reliabilities of all bits composing the symbols; and means for performing soft decision decoding for every symbol on the basis of said second reliability.
Claim 2
Independent Claim
81 words
A device for decoding coded digital signals for every symbol consisting of a plurality of binary signals comprising: first means for generating a respective first reliability for every binary signal; hard decided from the received or reproduced signal, in said symbol; second means for generating a second reliability for each symbol on the basis of said first reliabilities of all bits composing the symbols; and means for performing soft decision decoding for every symbol on the basis of said second reliability.
Claim 3
Dependent Claim
67 words
A device for decoding coded digital signals according to claim 1, wherein said first means consists of means for quantizing each of received or reproduced signal into bits not less than 2, means for adopting the most significant bit as binary signal the result of a hard decision; and means for adopting the bits other than the most significant bit as the reliabilities of the binary signal.
Claim 4
Dependent Claim
52 words
A device for decoding coded digital signals according to claim 1, wherein said second means obtains said second reliability L i by using; L.sub.i ≃-log{exp(-r.sub.il)+exp(-r.sub.i2) + . . . +exp(-r.sub.in)}, where r ij (1≦j≦n) is a likelihood ratio of the j-th binary signal of the i-th symbol consisting of n binary signals.
Claim 5
Dependent Claim
54 words
A device for decoding coded digital signals according to claim 1, wherein said second means obtains said second reliability L i by using; L.sub.i ≃min(r.sub.1, r.sub.2, . . . , r.sub.n) where r ij (1≦j ≦n) is a likelihood ratio of the j-th binary signal of the i-th symbol consisting of n binary signal.
Claim 6
Dependent Claim
27 words
A device for decoding coded digital signals according to claim 1, wherein said second reliability is the lowest one among the first reliabilities of the binary signals.
Claim 7
Dependent Claim
26 words
A device for decoding coded digital signals according to claim 1, wherein said second reliability is the product of the first reliabilities of the binary signals.
Claim 8
Dependent Claim
26 words
A device for decoding coded digital signals according to claim 1, wherein said second reliability is the sum of the first reliabilities of the binary signals.
References Cited (Backward Citations)
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JPS5890853A
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JPS602812A
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JPH05140782A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |