Apparatus and method for communication in variable bands

A transmission method for OFDM based communication in a bandwidth selected among multiple bandwidths provided for a system, the method comprising the steps of:

• mapping transmitted data into data pieces associated with individual subcarriers;
• inverse Fourier transforming the data pieces into a time-series signal;
• and
• generating symbols for radio transmission from the time-series signal,
• wherein the mapping step comprises associating the transmitted data with subcarriers different from predefined multiple subcarriers arranged at even intervals on a frequency axis.

A receiver for OFDM based communication in a bandwidth selected among multiple bandwidths provided for a system, comprising:

• a Fourier transform unit configured to convert a wirelessly received time-series signal into data pieces in frequency domains;
• a demapping unit configured to associate the data pieces with individual subcarriers as data for restoration;
• and
• a data restoring unit configured to restore transmitted data from the data for restoration,
• wherein the demapping unit supplies data comprising the data pieces associated with subcarriers different from predefined multiple subcarriers arranged at even intervals on a frequency axis as the data for restoration.

A reception method for OFDM based communication in a bandwidth selected among multiple bandwidths provided for a system, the method comprising the steps of:

• Fourier transforming a wirelessly received time-series signal into data pieces in frequency domains;
• associating the data pieces with individual subcarriers as data for restoration;
• and
• restoring transmitted data from the data for restoration,
• wherein the associating step comprises supplying data comprising the data pieces associated with subcarriers different from predefined multiple subcarriers arranged at even intervals on a frequency axis as the data for restoration.