Communication radio transmitter
AssigneeSharp Kabushiki Kaisha
InventorYasuhiro Hamaguchi
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Abstract
In some embodiments, a communication apparatus can transmit OFDM signals that include at least a first period and a second period. The communication apparatus can include a transmitting section and a signal processing section. The transmitting section can transmit the OFDM signals to an additional communication apparatus by using multiple subcarriers allocated a set of two or more contiguous frequency channels. The contiguous frequency channels can be used simultaneously by the additional communication apparatus. The signal processing section is configured to not use at least all subcarriers positioned in the respective centers of these frequency channels when allocating data to the subcarriers in the frequency channels used to transmit the OFDM signals for a first period.
Claims7
A first communication apparatus configured to transmit OFDM signals including at least a first period and a second period, the first communication apparatus comprising:
- a transmitting circuit configured to at least transmit the OFDM signals to a second communication apparatus by using a plurality of subcarriers allocated in M contiguous frequency channels, wherein M is an even number greater than or equal to 2, wherein the M contiguous frequency channels are simultaneously usable by the second communication apparatus, wherein the M contiguous frequency channels include the plurality of subcarriers and additional subcarriers respectively positioned in centers of the M contiguous frequency channels;
- and
- a signal processing circuit configured to perform:
- a first allocation of data, without using at least all of the additional subcarriers, for constructing OFDM symbols to a subset of the plurality of subcarriers on the M contiguous frequency channels;
- a second allocation of data for constructing the OFDM symbols for broadcast information data transmission without allocating data of the broadcast information data transmission to the additional subcarriers positioned in respective centers of the frequency channels on the M contiguous frequency channels;
- and
- a third allocation of data for constructing each of the OFDM symbols for communication data transmission without allocating data of the communication data transmission to the additional subcarriers positioned in a center of the M contiguous frequency channels.
Dependencies are inferred from the claim text.