US6038275A
Expired / Lapsed
US
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Digital broadcasting receiver
Assignee: Mitsubishi Electric Corp
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Filing: 1997-04-16
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Granted: 2000-03-14
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Expires: 2017-04-16
Abstract
Abstract A digital broadcasting receiver reduces the amount of operations in timing synchronization processing while reducing circuit scale and power consumption. Selective data extraction thins out and band-limits input data from demodulation data of phase reference symbols subjected to known modulation as synchronizing signal to reduce the number of data, so that the amount of required operations in phase correcting, IDFT and peak detecting can be reduced.
Inventors
- 👤 Kenichi Taura
- 👤 Tadatoshi Ohkubo
- 👤 Masahiro Tsujishita
- 👤 Yoshiharu Ohsuga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:02
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/26; H04L27/2601; H04L27/2647; H04L27/2655; H04L27/2662; H04H; H04H40/00; H04H40/18; H04L27/2657; H04L27/2668; H04L27/2673; H04L27/2675; H04L27/2681; H04L27/2684; H04H2201/00; H04H2201/10; H04H2201/20
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
207 words
A digital broadcasting receiver for multi-carrier transmission system, comprising: a data demodulator for performing demodulation of modulation data on a received signal; selective data extraction means for extracting data from an arrangement of phase reference symbol demodulation data output from said data demodulator; phase correcting means for performing multiplication, for each element, of the extracted data by said selective data extraction means and an arrangement of conjugate complex numbers of defined values of the phase reference symbols held in the receiver in advance in correspondence with said extracted data; inverse discrete Fourier transform means for applying inverse discrete Fourier transform to the output from said phase correcting means; peak detecting means for obtaining a peak of the result of the inverse discrete Fourier transform in said inverse discrete Fourier transform means; and synchronization control means for performing synchronization by adjusting timing of the received signal provided to said data demodulator on the basis of a position of the peak detected by said peak detecting means, wherein the extracted data are selectively extracted from the phase reference demodulated data in such a way as to reduce the number of reference demodulation data thereby reducing a processing load performed by said phase correction means and said synchronization control means.
Claim 2
Dependent Claim
207 words
A digital broadcasting receiver for multi-carrier transmission system, comprising: a data demodulator for performing demodulation of modulation data on a received signal; selective data extraction means for extracting data from an arrangement of phase reference symbol demodulation data output from said data demodulator; phase correcting means for performing multiplication, for each element, of the extracted data by said selective data extraction means and an arrangement of conjugate complex numbers of defined values of the phase reference symbols held in the receiver in advance in correspondence with said extracted data; inverse discrete Fourier transform means for applying inverse discrete Fourier transform to the output from said phase correcting means; peak detecting means for obtaining a peak of the result of the inverse discrete Fourier transform in said inverse discrete Fourier transform means; and synchronization control means for performing synchronization by adjusting timing of the received signal provided to said data demodulator on the basis of a position of the peak detected by said peak detecting means, wherein the extracted data are selectively extracted from the phase reference demodulated data in such a way as to reduce the number of reference demodulation data thereby reducing a processing load performed by said phase correction means and said synchronization control means.
Claim 3
Dependent Claim
35 words
The digital broadcast receiver according to claim 1, wherein said selective data extraction means extracts data in a skipped manner at approximately equal frequency intervals in the arrangement of the phase reference symbol demodulation data.
Claim 4
Dependent Claim
44 words
The digital broadcasting receiver according to claim 1, wherein said selective data extraction means extracts data in a skipped manner in a prescribed frequency range in the center part of the signal transmission band in the arrangement of the phase reference symbol demodulation data.
Claim 5
Dependent Claim
20 words
The digital broadcasting receiver according to claim 1, wherein data symbols following said phase reference symbol include a guard interval.
Claim 6
Dependent Claim
67 words
The digital broadcasting receiver according to claim 1, wherein said selective data extraction means extracts data in a skipped manner at approximately equal prescribed frequency intervals in the arrangement of the phase reference symbol demodulation data at the beginning of the synchronization, and in the next stage of the synchronization, extracts the data in a skipped manner at rougher intervals than at the beginning of the synchronization.
Claim 7
Dependent Claim
89 words
The digital broadcasting receiver according to claim 1, wherein the received signal has a corresponding signal transmission band, and wherein said selective data extracting means extracts data in a prescribed frequency range in the center part of the signal transmission band in the arrangement of the phase reference symbol demodulation data at the beginning of the synchronization, and extracts the data, in the next stage of the synchronization, in a narrower frequency range in the center part of the signal transmission band than at the beginning of the synchronization.
Claim 8
Dependent Claim
98 words
The digital broadcasting receiver according to claim 1, wherein the received signal has a corresponding signal transmission band, and wherein said selective data extraction means extracts data in a prescribed frequency range in the center part of the signal transmission band and at approximately equal prescribed intervals in the arrangement of the phase reference symbol demodulation data at the beginning of the synchronization, and extracts the data, in the next stage of the synchronization, in a wider frequency range than at the beginning of the synchronization and at rougher frequency intervals than at the beginning of the synchronization.
Claim 9
Dependent Claim
113 words
The digital broadcasting receiver according to claim 1, wherein the received signal has a corresponding signal transmission band, and wherein said selective data extraction means extracts data, at the beginning of the synchronization, in a prescribed frequency range in the center part of the signal transmission band in the arrangement of the phase reference symbol demodulation data and at frequency intervals of the arrangement of the phase reference symbol demodulation data, and in the next stage of the synchronization, cancels the bandwidth limitation at the beginning of the synchronization and extracts the data in a skipped manner at approximately equal prescribed frequency intervals in the arrangement of the phase reference symbol demodulation data.
Claim 10
Dependent Claim
97 words
The digital broadcasting receiver according to claim 1, wherein the received signal has a corresponding signal transmission band, and wherein said selective data extraction means extracts data in a prescribed frequency range in the center part of the signal transmission band in the arrangement of the phase reference symbol demodulation data at the beginning of the synchronization, and extracts the data, in the next stage of the synchronization, in a wider frequency range than at the beginning of the synchronization and at the approximately equal prescribed frequency intervals in the arrangement of phase reference symbol demodulation data.
Claim 11
Dependent Claim
22 words
The digital broadcasting receiver according to claim 1, said selective data extraction means thinning and/or band-limiting the demodulation data from said demodulator.
Claim 12
Dependent Claim
160 words
A digital broadcasting receiver for multi-carrier transmission system, comprising: a demodulator demodulating a signal having multiple carriers and outputting an arrangement of phase reference symbol demodulation data; a selective data extractor operatively connected to said demodulator, said selective data extractor extracting data from the phase reference symbol demodulation data; a phase corrector operatively connected to said selective data extractor; an inverse discrete Fourier transformer operatively connected to said phase corrector; a peak detector operatively connected to said inverse discrete Fourier transformer; and a synchronizer connected to said peak detector, said synchronizer performing synchronization by adjusting timing of the signal provided to said demodulator on the basis of a position of the peak detected by said peak detector, wherein said selective data extractor are selectively extracted from the phase reference demodulated data in such a way as to reduce the number of reference demodulation data thereby reducing a processing load performed by said phase correction means and said synchronization control means.
Claim 13
Dependent Claim
160 words
A digital broadcasting receiver for multi-carrier transmission system, comprising: a demodulator demodulating a signal having multiple carriers and outputting an arrangement of phase reference symbol demodulation data; a selective data extractor operatively connected to said demodulator, said selective data extractor extracting data from the phase reference symbol demodulation data; a phase corrector operatively connected to said selective data extractor; an inverse discrete Fourier transformer operatively connected to said phase corrector; a peak detector operatively connected to said inverse discrete Fourier transformer; and a synchronizer connected to said peak detector, said synchronizer performing synchronization by adjusting timing of the signal provided to said demodulator on the basis of a position of the peak detected by said peak detector, wherein said selective data extractor are selectively extracted from the phase reference demodulated data in such a way as to reduce the number of reference demodulation data thereby reducing a processing load performed by said phase correction means and said synchronization control means.
Claim 14
Dependent Claim
21 words
The digital broadcasting receiver according to claim 11, said selective data extractor thins and/or band-limits the demodulation data from said demodulator.
Claim 15
Dependent Claim
32 words
The method according to claim 11, wherein said selective data extractor extracts data in a skipped manner at approximately equal frequency intervals in the arrangement of the phase reference symbol demodulation data.
Claim 16
Dependent Claim
43 words
The digital broadcasting receiver according to claim 11, wherein said selective data extractor extracts data in a skipped manner in a prescribed frequency range in the center part of the signal transmission band in the arrangement of the phase reference symbol demodulation data.
Claim 17
Dependent Claim
66 words
The digital broadcasting receiver according to claim 11, wherein said selective data extractor extracts data in a skipped manner at approximately equal prescribed frequency intervals in the arrangement of the phase reference symbol demodulation data at the beginning of the synchronization, and in the next stage of the synchronization, extracts the data in a skipped manner at longer intervals than at the beginning of the synchronization.
Claim 18
Dependent Claim
87 words
The digital broadcasting receiver according to claim 11, wherein the signal has a corresponding signal transmission band, and wherein said selective data extractor extracts data in a prescribed frequency range in the center part of the signal transmission band in the arrangement of the phase reference symbol demodulation data at the beginning of the synchronization, and extracts the data, in the next stage of the synchronization, in a narrower frequency range in the center part of the signal transmission band than at the beginning of the synchronization.
Claim 19
Dependent Claim
96 words
The digital broadcasting receiver according to claim 11, wherein the received signal has a corresponding signal transmission band, and wherein said selective data extractor extracts data in a prescribed frequency range in the center part of the signal transmission band and at approximately equal prescribed intervals in the arrangement of the phase reference symbol demodulation data at the beginning of synchronization, and extracts the data, in the next stage of the synchronization, in a wider frequency range than at the beginning of the synchronization and at rougher frequency intervals than at the beginning of the synchronization.
Claim 20
Dependent Claim
112 words
The digital broadcasting receiver according to claim 11, wherein the received signal has a corresponding signal transmission band, and wherein said selective data extractor extracts data, at the beginning of the synchronization, in a prescribed frequency range in the center part of the signal transmission band in the arrangement of the phase reference symbol demodulation data and at frequency intervals of the arrangement of the phase reference symbol demodulation data, and in the next stage of the synchronization, cancels the bandwidth limitation at the beginning of the synchronization and extracts the data in a skipped manner at approximately equal prescribed frequency intervals in the arrangement of the phase reference symbol demodulation data.
Claim 21
Dependent Claim
96 words
The digital broadcasting receiver according to claim 11, wherein the received signal has a corresponding signal transmission band, and wherein said selective data extractor extracts data in a prescribed frequency range in the center part of the signal transmission band in the arrangement of the phase reference symbol demodulation data at the beginning of the synchronization, and extracts the data, in the next stage of the synchronization, in a wider frequency range than at the beginning of the synchronization, and at the approximately equal prescribed frequency intervals in the arrangement of phase reference symbol demodulation data.
Claim 22
Independent Claim
171 words
A method of receiving a digital broadcasting signal, comprising the steps of: demodulating a received signal having multiple carriers to output an arrangement of phase reference symbol demodulation data; selectively extracting data from an arrangement of the phase reference symbol demodulation data output from said data demodulating step; phase correcting by performing multiplication, for each element, of the extracted data by said selective data extracting step and an arrangement of conjugate complex numbers of defined values of the phase reference symbols; applying an inverse discrete Fourier transform to the output from said phase correcting step; obtaining a peak of the result of the applying step; and performing synchronization by adjusting timing of the received signal on the basis of a position of the peak detected by said peak detecting step, wherein the extracted data are selectively extracted from the phase reference demodulated data in such a way as to reduce the number of reference demodulation data thereby reducing a processing load performed by said phase correcting step and said synchronizing step.
Claim 23
Independent Claim
171 words
A method of receiving a digital broadcasting signal, comprising the steps of: demodulating a received signal having multiple carriers to output an arrangement of phase reference symbol demodulation data; selectively extracting data from an arrangement of the phase reference symbol demodulation data output from said data demodulating step; phase correcting by performing multiplication, for each element, of the extracted data by said selective data extracting step and an arrangement of conjugate complex numbers of defined values of the phase reference symbols; applying an inverse discrete Fourier transform to the output from said phase correcting step; obtaining a peak of the result of the applying step; and performing synchronization by adjusting timing of the received signal on the basis of a position of the peak detected by said peak detecting step, wherein the extracted data are selectively extracted from the phase reference demodulated data in such a way as to reduce the number of reference demodulation data thereby reducing a processing load performed by said phase correcting step and said synchronizing step.
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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) | 2003-03-14 | 2003-09-13 | 2004-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-14 | 2007-09-13 | 2008-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-14 | 2011-09-13 | 2012-03-14 | $7700.00 | Window Closed / Lapsed |