Transmission apparatus, transmission method, reception apparatus, and reception method

1. A transmission apparatus comprising:

a symbol arranger to receive N−1 symbols constituting a block, duplicate a first symbol of a block one block previous to the block, and output a block symbol being the block at present with the duplicated duplicate symbol inserted at a first position thereof;

a frequency converter to convert the block symbol into a frequency domain signal including N frequency components;

a frequency component remover to remove one or more frequency components from the frequency domain signal, and output up to N−1 frequency components;

a time converter to convert, after performing interpolation on the frequency domain signal with the one or more frequency components removed, the interpolated frequency domain signal into a time domain signal; and

a cyclic prefix inserter to duplicate, in the time domain signal, a signal from a position on a basis of the first position through an end of a time domain as a cyclic prefix, and insert the cyclic prefix at a beginning of the time domain signal.

2. The transmission apparatus according to claim 1 , wherein the time converter performs the interpolation such that one or more interpolation points interpolating between a last sample of the time domain signal and a top sample of the time domain signal are added after the last sample.

3. The transmission apparatus according to claim 1 , wherein the time converter performs the interpolation by oversampling that increases an amount of data.

4. The transmission apparatus according to claim 2 , wherein the time converter performs the interpolation by oversampling that increases an amount of data.

5. A transmission apparatus according to claim 3 , further comprising:

a symbol generator to generate a symbol; and

a transmitter to transmit the time domain signal with the cyclic prefix inputted from the cyclic prefix inserter as a single carrier block transmission signal; wherein

the frequency converter converts the block symbol into a frequency domain signal by a discrete Fourier transform; and

the time converter sets zeros to interpolated samples by the oversampling, sets a guard band for protecting interference, and converts the interpolated frequency domain signal into a time domain signal by an inverse discrete Fourier transform.

6. A transmission apparatus according to claim 4 , further comprising:

a symbol generator to generate a symbol; and

a transmitter to transmit the time domain signal with the cyclic prefix inputted from the cyclic prefix inserter as a single carrier block transmission signal; wherein

the frequency converter converts the block symbol into a frequency domain signal by a discrete Fourier transform; and

the time converter sets zeros to interpolated samples by the oversampling, sets a guard band for protecting interference, and converts the interpolated frequency domain signal into a time domain signal by an inverse discrete Fourier transform.

7. A transmission method comprising:

receiving N−1 symbols constituting a block, duplicating a first symbol of a block one block previous to the block, and outputting a block symbol being the block at present with the duplicated duplicate symbol inserted at a first position thereof;

converting the block symbol into a frequency domain signal including N frequency components;

removing one or more frequency components from the frequency domain signal, and outputting up to N−1 frequency components;

converting, after performing interpolation on the frequency domain signal with the one or more frequency components removed, the interpolated frequency domain signal into a time domain signal; and

duplicating, in the time domain signal, a signal from a position on a basis of the first position through an end of a time domain as a cyclic prefix, and inserting the cyclic prefix at a beginning of the time domain signal.

8. A reception apparatus comprising:

a cyclic prefix remover to remove a cyclic prefix from a received signal;

a frequency converter to convert the received signal with the cyclic prefix removed into a frequency domain signal;

an equalizer to perform, after removing an interpolated component from the frequency domain signal, equalization processing that corrects frequency characteristics of the frequency domain signal;

a duplicate symbol remover to remove, from the signal subjected to the equalization processing, a duplicate symbol being a duplication of a symbol of a past block;

a time converter to convert the signal with the duplicate symbol removed into a time domain signal; and

a decoder to perform decoding on a basis of the time domain signal.

9. The reception apparatus according to claim 8 , wherein the time converter demodulates the time domain signal, and outputs, from the demodulated symbols, a symbol at a first position used as the duplicate symbol to the duplicate symbol remover.

10. The reception apparatus according to claim 8 , wherein

the frequency converter converts the received signal with the cyclic prefix removed into a frequency domain signal by a discrete Fourier transform; and

the time converter converts the frequency domain signal into a time domain signal by an inverse discrete Fourier transform.

11. The reception apparatus according to claim 9 , wherein

the frequency converter converts the received signal with the cyclic prefix removed into a frequency domain signal by a discrete Fourier transform; and

the time converter converts the frequency domain signal into a time domain signal by an inverse discrete Fourier transform.

12. A reception method comprising:

removing a cyclic prefix from a received signal;

converting the received signal with the cyclic prefix removed into a frequency domain signal;

performing, after removing an interpolated component from the frequency domain signal, equalization processing that corrects frequency characteristics of the frequency domain signal;

removing, from the signal subjected to the equalization processing, a duplicate symbol being a duplication of a symbol of a past block;

converting the signal with the duplicate symbol removed into a time domain signal; and

decoding on a basis of the time domain signal.