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US 8,275,056 B2Granted
Receiver, integrated circuit, and reception method
AssigneePanasonic Corporation
InventorsTomohiro Kimura, Kenichiro Hayashi
Life of this patent
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Abstract
A channel characteristic calculation unit 23 estimates channel characteristics based on SP signals included in received signals, and a symbol interpolation filter 24 frequency-shifts frequency transfer characteristics and filters output signals of the channel characteristic calculation unit 23. A filter control unit 27 estimates channel characteristics based on CP signals included in the received signals and observes the estimated channel characteristics to determine a shift amount by which the symbol interpolation filter 24 frequency-shifts the frequency transfer characteristics. The symbol interpolation filter 24 frequency-shifts the frequency transfer characteristics based on the shift amount determined by the filter control unit 27.
Claims14
A receiver comprising:
- a channel characteristic calculation unit operable to calculate, based on pilot signals included in received signals, channel characteristics with respect to the pilot signals;
- a filter unit operable to perform, on the calculated channel characteristics, processing, which is at least one of (i) an interpolation and (ii) band limitation, using filter processing having frequency transfer characteristics capable of being frequency-shifted;
- an equalization unit operable to equalize the received signals based on the processed channel characteristics obtained as a result of the processing performed by the filter unit;
- and
- a filter control unit operable to determine a shift amount by which the frequency transfer characteristics are frequency-shifted, and control the frequency transfer characteristics,
- wherein the received signals include first signals being signals other than the pilot signals,
- wherein intervals in units of symbols at which the first signals are inserted into any one of carriers into which the first signals are inserted are shorter than intervals in units of symbols at which the pilot signals are inserted into any one of carriers into which the pilot signals are inserted,
- wherein the filter control unit observes channel characteristics with respect to the first signals included in the received signals and determines the shift amount based on a result of the observation, and
- wherein the filter unit frequency-shifts the frequency transfer characteristics by the determined shift amount.
6 more elements
A receiver comprising:
- an automatic frequency control unit operable to frequency-shift received signals so as to eliminate a frequency error in the received signals;
- a channel characteristic calculation unit operable to calculate, based on pilot signals included in the frequency-shifted received signals, channel characteristics with respect to the pilot signals;
- a filter unit operable to perform, on the calculated channel characteristics, processing, which is at least one of (i) an interpolation and (ii) band limitation, using filter processing;
- an equalization unit operable to equalize the received signals based on the processed channel characteristics obtained as a result of the processing performed by the filter unit;
- and
- a control unit operable to determine a shift amount by which the automatic frequency control unit frequency-shifts the received signals, and controls frequency-shifting of the received signals by the automatic frequency control unit,
- wherein the received signals include first signals being signals other than the pilot signals,
- wherein intervals in units of symbols at which the first signals are inserted into any one of carriers into which the first signals are inserted are shorter than intervals in units of symbols at which the pilot signals are inserted into any one of carriers into which the pilot signals are inserted,
- wherein the control unit observes channel characteristics with respect to the first signals included in the received signals and determines the shift amount based on a result of the observation, and
- wherein the automatic frequency control unit frequency-shifts the received signals by the determined shift amount.
7 more elements
An integrated circuit comprising:
- a channel characteristic calculation unit operable to calculate, based on pilot signals included in received signals, channel characteristics with respect to the pilot signals;
- a filter unit operable to perform, on the calculated channel characteristics, processing, which is at least one of (i) an interpolation and (ii) band limitation, using filter processing having frequency transfer characteristics capable of being frequency-shifted;
- an equalization unit operable to equalize the received signals based on the processed channel characteristics obtained as a result of the processing performed by the filter unit;
- and
- a filter control unit operable to determine a shift amount by which the frequency transfer characteristics are frequency-shifted, and control the frequency transfer characteristics,
- wherein the received signals include first signals being signals other than the pilot signals,
- wherein intervals in units of symbols at which the first signals are inserted into any one of carriers into which the first signals are inserted are shorter than intervals in units of symbols at which the pilot signals are inserted into any one of carriers into which the pilot signals are inserted,
- wherein the filter control unit observes channel characteristics with respect to the first signals included in the received signals and determines the shift amount based on a result of the observation, and
- wherein the filter unit frequency-shifts the frequency transfer characteristics by the determined shift amount.
6 more elements
An integrated circuit comprising:
- an automatic frequency control unit operable to frequency-shift received signals so as to eliminate a frequency error in the received signals;
- a channel characteristic calculation unit operable to calculate, based on pilot signals included in the frequency-shifted received signals, channel characteristics with respect to the pilot signals;
- a filter unit operable to perform, on the calculated channel characteristics, processing, which is at least one of (i) an interpolation and (ii) band limitation, using filter processing;
- an equalization unit operable to equalize the received signals based on the processed channel characteristics obtained as a result of the processing performed by the filter unit;
- and
- a control unit operable to determine a shift amount by which the automatic frequency control unit frequency-shifts the received signals, and controls frequency-shifting of the received signals by the automatic frequency control unit,
- wherein the received signals include first signals being signals other than the pilot signals,
- wherein intervals in units of symbols at which the first signals are inserted into any one of carriers into which the first signals are inserted are shorter than intervals in units of symbols at which the pilot signals are inserted into any one of carriers into which the pilot signals are inserted
- wherein the control unit observes channel characteristics with respect to the first signals included in the received signals and determines the shift amount based on a result of the observation, and
- wherein the automatic frequency control unit frequency-shifts the received signals by the determined shift amount.
7 more elements
A reception method comprising:
- a channel characteristic calculation step of calculating, based on pilot signals included in received signals, channel characteristics with respect to the pilot signals;
- a filtering step of performing, on the calculated channel characteristics, processing, which is at least one of (i) an interpolation and (ii) band limitation, using filter processing having frequency transfer characteristics capable of being frequency-shifted;
- an equalizing step of equalizing the received signals based on the processed channel characteristics obtained as a result of the processing performed by the filtering step;
- and
- a filter controlling step of determining a shift amount by which the frequency transfer characteristics are frequency-shifted, and controlling the frequency transfer characteristics,
- wherein the received signals include first signals being signals other than the pilot signals,
- wherein intervals in units of symbols at which the first signals are inserted into any one of carriers into which the first signals are inserted are shorter than intervals in units of symbols at which the pilot signals are inserted into any one of carriers into which the pilot signals are inserted,
- wherein the filter controlling step observes channel characteristics with respect to the first signals included in the received signals and determines the shift amount based on a result of the observation, and
- wherein the filtering step frequency-shifts the frequency transfer characteristics by the determined shift amount.
6 more elements
A reception method comprising:
- an automatic frequency controlling step of frequency-shifting received signals so as to eliminate a frequency error in the received signals;
- a channel characteristic calculating step of calculating, based on pilot signals included in the frequency-shifted received signals, channel characteristics with respect to the pilot signals;
- a filtering step of performing, on the calculated channel characteristics, processing, which is at least one of (i) an interpolation and (ii) band limitation, using filter processing;
- an equalizing step of equalizing the received signals based on the processed channel characteristics obtained as a result of the processing performed by the filtering step;
- and
- a controlling step of determining a shift amount by which the automatic frequency controlling step frequency-shifts the received signals, and controlling frequency-shifting of the received signals by the automatic frequency controlling step,
- wherein the received signals include first signals being signals other than the pilot signals,
- wherein intervals in units of symbols at which the first signals are inserted into any one of carriers into which the first signals are inserted are shorter than intervals in units of symbols at which the pilot signals are inserted into any one of carriers into which the pilot signals are inserted,
- wherein the controlling step observes channel characteristics with respect to the first signals included in the received signals and determines the shift amount based on a result of the observation, and
- wherein the automatic frequency controlling step frequency-shifts the received signals by the determined shift amount.
7 more elements
Dependencies are inferred from the claim text.