Radio receiving apparatus and radio receiving method
AssigneeKabushiki Kaisha Toshiba
InventorToshiyuki Yamagishi
Life of this patent
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Abstract
In-phase channels and quadrature-phase channels of carrier waves are calculated from a reception signal obtained by receiving the multi-carrier signal. Transmission channel characteristics of the carrier waves are calculated from a known signal section of the reception signal. Transmission channel equalization processing for compensating for an amplitude change and phase rotation in the in-phase channels and the quadrature-phase channels caused by a transmission channel is performed. A region on a complex plane in which output data after transmission channel equalization is present is determined. An estimation value of a phase rotation angle used in performing the transmission channel equalization processing is corrected based on information concerning the determined region.
Claims18
A radio receiving apparatus that receives a multicarrier signal, comprising:
- a Fourier transform unit that calculates in-phase channels and quadrature-phase channels of carrier waves from a reception signal obtained by receiving the multicarrier signal;
- a transmission-channel estimating unit that calculates transmission channel characteristics of the carrier waves from a known signal section of the reception signal;
- a transmission-channel equalizing unit that receives an output of the Fourier transform unit as an input and performs processing for compensating for an amplitude change and a phase rotation in the output of the Fourier transform unit caused by a transmission channel;
- a region determining unit that determines a region on a complex plane in which output data after transmission channel equalization is present;
- a power calculating unit that receives the in-phase channels and the quadrature-phase channels after the transmission channel equalization as an input and calculates a power component of the reception signal;
- and
- a transmission-channel-fluctuation correcting unit that corrects
- an estimation value of a phase rotation angle output to the transmission-channel equalizing unit by the transmission-channel estimating unit based on a determination result of the region determining unit, and corrects
- an estimation value of an amplitude fluctuation output to the transmission-channel equalization unit by the transmission-channel estimating unit based on a calculation result of the power calculating unit.
A radio receiving method for receiving a multi-carrier signal, comprising:
- calculating in-phase channels and quadrature-phase channels of carrier waves from a reception signal obtained by receiving the multi-carrier signal;
- calculating transmission channel characteristics of the carrier waves from a known signal section of the reception signal;
- performing transmission channel equalization processing for compensating for an amplitude change and phase rotation in the in-phase channels and the quadraturephase channels caused by a transmission channel;
- determining a region on a complex plane in which output data after transmission channel equalization is present;
- receiving the in-phase channels and the quadraturephase channels in the output data after the transmission channel equalization as an input and calculating a power component of the reception signal;
- correcting, based on information concerning the determined region, an estimation value of a phase rotation angle and an estimation value of amplitude fluctuation used in performing the transmission channel equalization processing;
- and
- correcting, based on information concerning the calculated power component, the estimation value of the amplitude fluctuation used in performing the transmission channel equalization processing.
Dependencies are inferred from the claim text.