Patent US5452322A successfully refreshed from Google Patents.
US5452322A
Expired / Lapsed
US
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Receiver for digital signals transmitted in the coded differential modulation mode
Assignee: US Philips Corp
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Filing: 1994-03-15
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Granted: 1995-09-19
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Expires: 2014-03-15
Abstract
Abstract Receiver (5) for digital signals which comprises a differential decoding circuit deinterleaving and convolution decoding circuit for received digital signals. The differential decoding circuit restores each received symbol to the original phase it had on transmission. This permits the calculation of optimum metrics (M.sub.k.sup.a,M.sub.k.sup.b) which are used by convolution decoding circuit to provide optimum decoding of received symbols.
Inventors
- 👤 Vincent Lauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:08
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0045; H04L1/0054; H04L27/00; H04L27/18; H04L27/22; H04L27/233; H04L27/2332; H04L1/0056; H04L1/0071
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
134 words
Receiver for digital signals which have successively undergone, on transmission, a channel coding and a differential coding and which resulting coded digital signals have been assigned to symbols of a constellation, the receiver comprising differential decoding means which calculate metrics in response to received symbols, and channel decoding means for producing decoded digital signals in response to the calculated metrics, wherein the differential decoding means comprise first means for estimating for each received symbol a rotation phase which the constellation undergoes and for restoring said received symbol to its original phase, second means for calculating optimum metrics in response to received symbols that have been restored to their original phase, and third means for calculating a mean noise output which influences the symbols and for normalizing each received symbol relative to the mean noise.
Claim 2
Dependent Claim
134 words
Receiver for digital signals which have successively undergone, on transmission, a channel coding and a differential coding and which resulting coded digital signals have been assigned to symbols of a constellation, the receiver comprising differential decoding means which calculate metrics in response to received symbols, and channel decoding means for producing decoded digital signals in response to the calculated metrics, wherein the differential decoding means comprise first means for estimating for each received symbol a rotation phase which the constellation undergoes and for restoring said received symbol to its original phase, second means for calculating optimum metrics in response to received symbols that have been restored to their original phase, and third means for calculating a mean noise output which influences the symbols and for normalizing each received symbol relative to the mean noise.
Claim 3
Dependent Claim
23 words
Receiver as claimed in claim 1, wherein the first means and/or the second means and/or the third means comprise a suitably programmed computer.
Claim 4
Dependent Claim
35 words
Receiver as claimed in claim 1, wherein the resulting coded digital symbols have been transmitted either on a monocarrier or on multicarriers and the receiver comprises differential decoding means for the monocarrier or for multicarriers.
Claim 5
Dependent Claim
48 words
Receiver as claimed in claim 1, wherein the differential decoding means comprise fourth means for measuring over various symbols a mean amplitude which is normalized relative to the mean noise and for calculating said optimum metrics on the basis of said restored symbols and the normalized mean amplitudes.
Claim 6
Dependent Claim
27 words
Receiver as claimed in claim 4, wherein the first means and/or the second means and/or the third means and/or the fourth means comprise a suitably programmed computer.
Claim 7
Dependent Claim
19 words
Receiver as claimed in claim 1, wherein the second means comprise a memory in which precalculated metrics are stored.
Claim 8
Dependent Claim
19 words
Receiver as claimed in claim 2, wherein the second means comprise a memory in which precalculated metrics are stored.
Claim 9
Dependent Claim
35 words
Receiver as claimed in claim 2, wherein the resulting coded digital symbols have been transmitted either on a monocarrier or on multicarriers and the receiver comprises differential decoding means for the monocarrier or for multicarriers.
Claim 10
Dependent Claim
35 words
Receiver as claimed in claim 7, wherein the resulting coded digital symbols have been transmitted either on a monocarrier or on multicarriers and the receiver comprises differential decoding means for the monocarrier or for multicarriers.
Claim 11
Dependent Claim
147 words
Receiver for digital signals which have successively undergone, on transmission, a channel coding and a differential coding and which resulting coded digital signals have been assigned to symbols of a constellation, the receiver comprising differential decoding means which calculate metrics in response to received symbols, and channel decoding means for producing decoded digital signals in response to the calculated metrics, wherein the differential decoding means comprise first means for estimating for each received symbol a rotation phase which the constellation undergoes and for restoring said received symbol to its original phase, second means for calculating optimum metrics in response to received symbols that have been restored to their original phase, and third means for measuring over various symbols a mean amplitude which is normalized relative to the mean noise and for calculating said optimum metrics on the basis of said restored symbols and the normalized mean amplitudes.
Claim 12
Dependent Claim
147 words
Receiver for digital signals which have successively undergone, on transmission, a channel coding and a differential coding and which resulting coded digital signals have been assigned to symbols of a constellation, the receiver comprising differential decoding means which calculate metrics in response to received symbols, and channel decoding means for producing decoded digital signals in response to the calculated metrics, wherein the differential decoding means comprise first means for estimating for each received symbol a rotation phase which the constellation undergoes and for restoring said received symbol to its original phase, second means for calculating optimum metrics in response to received symbols that have been restored to their original phase, and third means for measuring over various symbols a mean amplitude which is normalized relative to the mean noise and for calculating said optimum metrics on the basis of said restored symbols and the normalized mean amplitudes.
Claim 13
Dependent Claim
23 words
Receiver as claimed in claim 10, wherein the first means and/or the second means and/or the third means comprise a suitably programmed computer.
Claim 14
Dependent Claim
19 words
Receiver as claimed in claim 10, wherein the second means comprise a memory in which precalculated metrics are stored.
Claim 15
Dependent Claim
35 words
Receiver as claimed in claim 10, wherein the resulting coded digital symbols have been transmitted either on a monocarrier or on multicarriers and the receiver comprises differential decoding means for the monocarrier or for multicarriers.
Claim 16
Dependent Claim
123 words
Receiver for digital signals which have successively undergone, on transmission, a channel coding and a differential coding and which resulting coded digital signals have been assigned to symbols of a constellation, the receiver comprising differential decoding means which calculate metrics in response to received symbols, and channel decoding means for producing decoded digital signals in response to the calculated metrics, wherein the differential decoding means comprise first means for estimating for each received symbol a rotation phase which the constellation undergoes and for restoring said received symbol to its original phase, second means for calculating optimum metrics in response to received symbols that have been restored to their original phase, wherein the second means comprise a memory in which precalculated metrics are stored.
Claim 17
Dependent Claim
123 words
Receiver for digital signals which have successively undergone, on transmission, a channel coding and a differential coding and which resulting coded digital signals have been assigned to symbols of a constellation, the receiver comprising differential decoding means which calculate metrics in response to received symbols, and channel decoding means for producing decoded digital signals in response to the calculated metrics, wherein the differential decoding means comprise first means for estimating for each received symbol a rotation phase which the constellation undergoes and for restoring said received symbol to its original phase, second means for calculating optimum metrics in response to received symbols that have been restored to their original phase, wherein the second means comprise a memory in which precalculated metrics are stored.
Claim 18
Dependent Claim
35 words
Receiver as claimed in claim 14, wherein the resulting coded digital symbols have been transmitted either on a monocarrier or on multicarriers and the receiver comprises differential decoding means for the monocarrier or for multicarriers.
References Cited (Backward Citations)
EP0045260A1
Cited
US4675871A
Cited
US5023889A
Cited
FR2639495A1
Cited
US5191576A
Cited
EP0449146A2
Cited
US5195108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-18 | 1999-03-20 | 1999-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-18 | 2003-03-20 | 2003-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-18 | 2007-03-20 | 2007-09-19 | $7700.00 | Window Closed / Lapsed |