A transmission device comprising: a coding unit configured to perform coding on a sequence of modulated symbols using space-time block coding or space-frequency block coding to generate sequences of symbols for a plurality of layers; a transmission block pattern generation unit configured to generate, on a per-layer basis, a transmission block pattern including at least one unit block, the unit block including at least one data block formed of resources arranged consecutively in a temporal direction or in a frequency direction and a null symbol; a subcarrier mapping unit configured to deploy the transmission block pattern in a repeating arrangement in the temporal direction and in the frequency direction, and to map the sequences of symbols for a plurality of layers onto subcarriers; and a plurality of transmission processing units configured to transmit a plurality of signals as mapped by the subcarrier mapping unit, wherein the transmission block pattern is a second pattern that is a combination of a first pattern and a pattern generated by cyclic shifting of the first pattern in the temporal direction or in the frequency direction without dividing of the unit block, the first pattern being a combination of the unit block and a pilot symbol for each of the layers; characterized by further comprising: a random series generation unit configured to generate a random series or a specific signal sequence, wherein the transmission block pattern generation unit is configured to generate a plurality of transmission block patterns having different patterns, and the subcarrier mapping unit is configured to place a corresponding transmission block pattern of the plurality of transmission block patterns in the temporal direction or in the frequency direction based on the random series or on the specific signal sequence. a coding unit configured to perform coding on a sequence of modulated symbols using space-time block coding or space-frequency block coding to generate sequences of symbols for a plurality of layers; a transmission block pattern generation unit configured to generate, on a per-layer basis, a transmission block pattern including at least one unit block, the unit block including at least one data block formed of resources arranged consecutively in a temporal direction or in a frequency direction and a null symbol; a subcarrier mapping unit configured to deploy the transmission block pattern in a repeating arrangement in the temporal direction and in the frequency direction, and to map the sequences of symbols for a plurality of layers onto subcarriers; and a plurality of transmission processing units configured to transmit a plurality of signals as mapped by the subcarrier mapping unit, wherein the transmission block pattern is a second pattern that is a combination of a first pattern and a pattern generated by cyclic shifting of the first pattern in the temporal direction or in the frequency direction without dividing of the unit block, the first pattern being a combination of the unit block and a pilot symbol for each of the layers; a random series generation unit configured to generate a random series or a specific signal sequence, wherein the transmission block pattern generation unit is configured to generate a plurality of transmission block patterns having different patterns, and the subcarrier mapping unit is configured to place a corresponding transmission block pattern of the plurality of transmission block patterns in the temporal direction or in the frequency direction based on the random series or on the specific signal sequence.