Transmitting method, receiving method, transmitting apparatus, and receiving apparatus
Provided are a frame configuring unit configured to configure a frame using a plurality of orthogonal frequency-division multiplexing (OFDM) symbols, by allocating time resources and frequency resources to a plurality of transmission data, and a transmitter which transmits the frame. The frame includes a first period in which a preamble which includes information on a frame configuration of the frame is transmitted, a second period in which a plurality of transmission data are transmitted by time division, a third period in which a plurality of transmission data are transmitted by frequency division, and a fourth period in which a plurality of transmission data are transmitted by time division and frequency division.
1. A transmitting apparatus comprising:
at least one processor configured to:
generate a frame by mapping first modulated signals of a first Physical Layer Pipe (PLP) and second modulated signals of a second PLP onto time-frequency resources used for data transmission;
insert pilot signals into the frame; and
perform an Inverse Fast Fourier Transform (IFFT) processing on the pilot inserted frame to generate an orthogonal frequency-division multiplexing (OFDM) signal; and
a transmitter configured to transmit the OFDM signal, wherein
the time-frequency resources include first resources and second resources that are provided for a first OFDM symbol and a second OFDM symbol, respectively, the first resources being arranged in a frequency direction and corresponding to respective OFDM subcarriers for data transmission, the second resources being arranged in the frequency direction and corresponding to the respective OFDM subcarriers for data transmission, the first resources being adjacent to the second resources in a time direction,
the first modulated signals include a first sequence of first modulated signals and a second sequence of first modulated signals following the first sequence,
the first sequence is mapped onto the first resources only within a first range in the frequency direction,
the second sequence is mapped onto the second resources only within the first range,
the second modulated signals include a third sequence of second modulated signals and a fourth sequence of second modulated signals following the third sequence,
the third sequence is mapped onto the first resources only within a second range in the frequency direction, the second range being not overlapped with the first range,
the fourth sequence is mapped onto the second resources only within the second range,
the time-frequency resources include a resource onto which no modulated signal is mapped and which is provided for a dummy signal,
the dummy signal being generated based on a pseudo-random coefficient, and
the dummy signal includes symbols having an in-phase component of 1 or −1, and a quadrature component that can only be a fixed value of 0.
2. The transmitting apparatus according to claim 1 , wherein
a last modulated signal of the first sequence is mapped onto a resource among the first resources corresponding to a highest frequency in the first range, and
an initial modulated signal of the second sequence is mapped onto a resource among the second resources corresponding to a lowest frequency in the first range.
3. The transmitting apparatus according to claim 1 , wherein the first range is adjacent to the second range in the frequency direction.