Transmitting apparatus

A receiving method comprising:

• receiving an orthogonal frequency-division multiplexing (OFDM) signal, where
• the OFDM signal is generated by inserting a pilot signals into a frame and performing an Inverse Fast Fourier Transform (IFFT) process to the pilot inserted frame,
• the frame includes a preamble and the plurality of data symbol groups,
• to each of the plurality of data symbol groups, time-frequency resources corresponding to a part of frequency among an entirety of the frequency of the frame is allocated, and
• the preamble carries control information, for each of the plurality of data symbol groups, specifying the time-frequency resources allocated to the data symbol group;
• acquiring the control information from the preamble;
• and
• demodulating at least one of the plurality of data symbol groups based on the control information,
• wherein the control information of each data symbol group indicates at least a head position of time, a head position of frequency and the number of time resources, of the time-frequency resources allocated to the data symbol group in the frame.

A transmitting apparatus comprising:

• a frame configuring circuitry, that in operation, generates a frame by allocating time-frequency resources to a plurality of data symbol groups;
• a signal processing circuitry, that in operation, inserts pilot signals into the frame and generates an orthogonal frequency-division multiplexing (OFDM) signal by performing an Inverse Fast Fourier Transform (IFFT) process to the pilot inserted frame;
• and
• transmitting circuitry, that in operation, transmits the OFDM signal,
• wherein the frame includes a preamble and the plurality of data symbol groups,
• to each of the plurality of data symbol groups, time-frequency resources corresponding to a part of frequency among an entirety of the frequency of the frame is allocated, and
• the preamble carries control information, for each of the plurality of data symbol groups, specifying the time-frequency resources allocated to the data symbol group,
• the control information of each data symbol group indicates at least a head position in time, a head position in frequency and the number of time resources, of the time-frequency resources allocated to the data symbol group in the frame.

A receiving apparatus comprising:

• receiving circuitry, that in operation, receives an orthogonal frequency-division multiplexing (OFDM) signal, where
• the OFDM signal is generated by inserting a pilot signals into a frame and performing an Inverse Fast Fourier Transform (IFFT) process to the pilot inserted frame,
• the frame includes a preamble and the plurality of data symbol groups,
• to each of the plurality of data symbol groups, time-frequency resources corresponding to a part of frequency among an entirety of the frequency of the frame is allocated, and
• the preamble carries control information, for each of the plurality of data symbol groups, specifying the time-frequency resources allocated to the data symbol group;
• a preamble processing circuitry, that in operation, acquires the control information from the preamble;
• and
• a demodulating circuitry, that in operation, demodulates at least one of the plurality of data symbol groups based on the control information,
• wherein the control information of each data symbol group indicates at least a head position of time, a head position of frequency and the number of time resources, of the time-frequency resources allocated to the data symbol group in the frame.