Transmission apparatus, transmission method, reception apparatus and reception method
In a transmission apparatus, signal carrier signal circuitry that generates two single carrier signals including a legacy preamble signal, a legacy header signal and an extension header signal respectively. OFDM signal circuitry that generates one OFDM signal by performing an IFFT processing on one or more payload signals. Transmission circuitry that transmits the two single carrier signals by allocating to a bonding channel which is formed by bonding two adjacent channels used in a bonding transmission scheme and the one OFDM signal by allocating to the bonding channel which is frequency-shifted.
1. A transmission apparatus comprising:
single carrier signal circuitry which, in operation, generates a first single carrier signal and a second single carrier signal, each of the first and second single carrier signals including a legacy preamble signal, a legacy header signal and an extension header signal, the legacy preamble signal including a short training field (STF) and a channel estimation field (CEF);
orthogonal frequency-division multiplexing (OFDM) signal circuitry which, in operation,
sets a first center frequency of a first payload signal to a position that is 209 subcarriers lower from a center of 1024 consecutive subcarriers;
sets a second center frequency of a second payload signal to another position that is 210 subcarriers higher from the center of the 1024 consecutive subcarriers;
performs inverse fast Fourier transform (IFFT) processing on the first payload signal and the second payload signal and generates one OFDM signal to be mapped on a bonding channel comprising a first channel and a second channel, wherein a fast Fourier transform (FFT) size is 1024; and
shifts the generated OFDM signal by an offset amount that is a difference between a center-frequency of the first channel and one of the 1024 consecutives subcarriers;
frame generation circuitry which, in operation, generates a frame by:
mapping the first single carrier signal and the second single carrier signal respectively to the first channel and the second channel; and
mapping the shifted OFDM signal to the bonding channel; and
transmission circuitry which, in operation, transmits the generated frame over the bonding channel.
2. The transmission apparatus according to claim 1 , wherein
an interval between the first channel and the second channel is 2.16 GHz,
a sampling rate in the IFFT processing is 5.28 GHz, and
a center frequency of the bonding channel corresponds to a frequency separated by 209 subcarriers from a center frequency of the first channel.
3. The transmission apparatus according to claim 1 , wherein a gap between a shifted center frequency of the bonding channel and the center frequency of the one of the first and second channels is an integer multiple of a subcarrier spacing.
4. A reception apparatus comprising:
reception circuitry which, in operation, receives a signal mapped to a bonding channel; and
processing circuitry which, in operation, generates a first payload signal and a second payload signal by performing fast Fourier transform (FFT) processing on the received signal; wherein:
the received signal is generated in a transmission apparatus and includes a first single carrier signal mapped to a first channel, a second single carrier signal mapped to a second channel and an orthogonal frequency-division multiplexing (OFDM) signal mapped to the bonding channel,
each of the first and second single carrier signals includes a legacy preamble signal, a legacy header signal and an extension header signal, the legacy preamble signal including a short training field (STF) and a channel estimation field (CEF),
a first center frequency of the first payload signal is set to a position that is 209 subcarriers lower from a center of 1024 consecutive subcarriers, a second center frequency of the second payload signal is set to another position that is 210 subcarriers higher from the center of the 1024 consecutive subcarriers,
the one OFDM signal is generated by performing inverse fast Fourier transform (IFFT) processing on the first payload signal and the second payload signal and generating one OFDM signal to be mapped on the bonding channel comprising the first channel and the second channel,
an FFT size is 1024, and
the generated OFDM signal is shifted by an offset amount that is a difference between a center-frequency of the first channel and one of the 1024 consecutives subcarriers.
5. The reception apparatus according to claim 4 , wherein
an interval between the first and second channels is 2.16 GHz,
a sampling rate in the IFFT processing is 5.28 GHz, and
a center frequency of the bonding channel corresponds to a frequency separated by 209 subcarriers from a center frequency of the first channel.
6. The reception apparatus according to claim 4 , wherein a gap between a shifted center frequency of the bonding channel and the center frequency of the one of the first and second channels is an integer multiple of a subcarrier spacing.
7. A transmission method comprising:
generating a first single carrier signal and a second single carrier signal, each of the first and second single carrier signals including a legacy preamble signal, a legacy header signal and an extension header signal, the legacy preamble signal including a short training field (STF) and a channel estimation field (CEF);
setting a first center frequency of a first payload signal to a position that is 209 subcarriers lower from a center of 1024 consecutive subcarriers;
setting a second center frequency of a second payload signal to another position that is 210 subcarriers higher from the center of the 1024 consecutive subcarriers;
performing inverse fast Fourier transform (IFFT) processing on the first payload signal and the second payload signal and generating one orthogonal frequency-division multiplexing (OFDM) signal to be mapped on a bonding channel comprising a first channel and a second channel, wherein a fast Fourier transform (FFT) size is 1024;
shifting the generated OFDM signal by an offset amount that is a difference between a center-frequency of the first channel and one of the 1024 consecutives subcarriers;
generating a frame by:
mapping the first single carrier signal and the second single carrier signal respectively to the first channel and the second channel; and
mapping the shifted OFDM signal to the bonding channel; and
transmitting the generated frame over the bonding channel.
8. The transmission method according to claim 7 , wherein
an interval between the first channel and the second channel is 2.16 GHz,
a sampling rate in the IFFT processing is 5.28 GHz, and
a shifted center frequency of the bonding channel corresponds to a frequency separated by 209 subcarriers from a center frequency of the first channel.
9. The transmission method according to claim 7 , wherein a gap between a shifted center frequency of the bonding channel and the center frequency of the one of the first and second channels is an integer multiple of a subcarrier spacing.
10. A reception method comprising:
receiving a signal mapped to a bonding channel; and
generating a first payload signal and a second payload signal by performing fast Fourier transform (FFT) processing on the received signal; wherein:
the received signal is generated in a transmission apparatus and includes a first single carrier signal mapped to a first channel, a second single carrier signal mapped to a second channel and an orthogonal frequency-division multiplexing (OFDM) signal mapped to the bonding channel,
each of the first and second single carrier signals including a legacy preamble signal, a legacy header signal and an extension header signal, the legacy preamble signal including a short training field (STF) and a channel estimation field (CEF),
a first center frequency of the first payload signal is set to a position that is 209 subcarriers lower from a center of 1024 consecutive subcarriers, a second center frequency of the second payload signal is set to another position that is 210 subcarriers higher from the center of the 1024 consecutive subcarriers,
the one OFDM signal is generated by performing inverse fast Fourier transform (IFFT) processing on the first payload signal and the second payload signal and generating one OFDM signal to be mapped on the bonding channel comprising the first channel and the second channel,
an FFT size is 1024, and
the generated OFDM signal is shifted by an offset amount that is a difference between a center-frequency of the first channel and one of the 1024 consecutives subcarriers.
11. The reception method according to claim 10 , wherein
an interval between the first channel and the second channel is 2.16 GHz,
a sampling rate in the IFFT processing is 5.28 GHz, and
a shifted center frequency of the bonding channel corresponds to a frequency separated by 209 subcarriers from a center frequency of the first channel.
12. The reception method according to claim 10 , wherein a gap between a shifted center frequency of the bonding channel and the center frequency of the one of the first and second channels is an integer multiple of a subcarrier spacing.