Radio transmitting apparatus, radio receiving apparatus and method therefor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorKenichi MIYOSHI
Life of this patent
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Abstract
By assigning a plurality of subcarriers 31 to a data channel 33 and assigning fewer subcarriers 32 than the plurality of subcarriers 31 to a control channel 34, and in addition locating the control channel 34 at the center frequency fc of a frequency band used to transmit the data channel 33, on the radio receiving apparatus side, the frequencies of a local signal by which the received signal is multiplied share the same value, thereby speeding up the switching between the control channel and the data channel.
Claims8
A radio receiving apparatus, for receiving an OFDM multicarrier signal comprising a first plurality of subcarriers and a second plurality of subcarriers, wherein a data channel is assigned to the first plurality of subcarriers of the OFDM multicarrier signal, a control channel is assigned to the second plurality of subcarriers of the OFDM multicarrier signal, the second plurality of subcarriers are located between the first plurality of subcarriers on a frequency axis, and the center frequency of the data channel and the center frequency of the control channel are common, the radio receiving apparatus comprising:
- a receiver operable to receive the OFDM multicarrier signal;
- and
- a down-conversion section operable to down-convert the received OFDM′ multicarrier signal.
A radio receiving method, for receiving an OFDM multicarrier signal comprising a first plurality of subcarriers and a second plurality of subcarriers, wherein a data channel is assigned to the first plurality of subcarriers of the OFDM multicarrier signal, a control channel is assigned to the second plurality of subcarriers of the OFDM multicarrier signal, the second plurality of subcarriers are located between the first plurality of subcarriers on a frequency axis, and the center frequency of the data channel and the center frequency of the control channel are common, the radio receiving method comprising:
- receiving the OFDM multicarrier signal;
- and
- down-converting the received OFDM multicarrier signal.
The radio receiving method according to claim 6 wherein:
- a guard frequency band is provided between the first plurality of subcarriers of the OFDM multicarrier signal and the second plurality of subcarriers of the OFDM multicarrier signal.
Dependencies are inferred from the claim text.