A transmitter comprising: a null symbol map unit configured to determine a null symbol arrangement pattern in a two-dimensional space by arranging one of at least two different unit patterns in each of parts of the two-dimensional space and combining the at least two different unit patterns, the null symbol map unit having the at least two different unit patterns, the at least two different unit patterns determining positions of data symbols and null symbols, the two-dimensional space being divided into parts each having a size of a unit pattern, the two-dimensional space being defined by a plurality of subcarriers for use in multicarrier transmission and a time series represented in units of time determined in accordance with a single symbol; a subcarrier map unit configured to assign, in the two-dimensional space transmission data to positions of data symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern; a modulation unit configured to generate the data symbols by modulating the transmission data assigned to the respective subcarriers, assign null symbols having a power of 0 to positions of null symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern, and generate transmission symbols of the respective subcarriers; a baseband section configured to output a baseband signal on a basis of the transmission symbols generated by the modulation unit; and a random sequence generator configured to generate a pseudorandom sequence on a basis of an initial value, wherein the null symbol map unit configured to determine the null symbol arrangement pattern by combining the unit patterns on a basis of the pseudorandom sequence. a null symbol map unit configured to determine a null symbol arrangement pattern in a two-dimensional space by arranging one of at least two different unit patterns in each of parts of the two-dimensional space and combining the at least two different unit patterns, the null symbol map unit having the at least two different unit patterns, the at least two different unit patterns determining positions of data symbols and null symbols, the two-dimensional space being divided into parts each having a size of a unit pattern, the two-dimensional space being defined by a plurality of subcarriers for use in multicarrier transmission and a time series represented in units of time determined in accordance with a single symbol; a subcarrier map unit configured to assign, in the two-dimensional space transmission data to positions of data symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern; a modulation unit configured to generate the data symbols by modulating the transmission data assigned to the respective subcarriers, assign null symbols having a power of 0 to positions of null symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern, and generate transmission symbols of the respective subcarriers; a baseband section configured to output a baseband signal on a basis of the transmission symbols generated by the modulation unit; and a random sequence generator configured to generate a pseudorandom sequence on a basis of an initial value, wherein the null symbol map unit configured to determine the null symbol arrangement pattern by combining the unit patterns on a basis of the pseudorandom sequence. <EOS>