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US 6,038,275 AGranted
Digital broadcasting receiver
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKenichi Taura, Tadatoshi Ohkubo, Masahiro Tsujishita, Yoshiharu Ohsuga
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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.
Claims20
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.
5 more elements
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.
5 more elements
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.
5 more elements
Dependencies are inferred from the claim text.