Patent ID: 8270508

Claim:
A transmitter for OFDM based communication in a bandwidth selected among multiple bandwidths provided for a system, comprising: a mapping unit configured to map transmitted data into data pieces associated with individual subcarriers; an inverse Fourier transform unit configured to convert the data pieces into a time-series signal; and a symbol generation unit configured to generate symbols for radio transmission from the time-series signal, wherein the mapping unit assigns a null subcarrier to a center frequency settable to different frequencies in a minimum bandwidth in the multiple bandwidths and assigns the transmitted data to subcarriers different from the null subcarrier; wherein the mapping unit assigns multiple null subcarriers in a maximum bandwidth in the multiple bandwidths and assigns the transmitted data to subcarriers different from the multiple null subcarriers; and wherein the null subcarrier in the minimum bandwidth corresponds to any of the multiple null subcarriers in the maximum bandwidth.