Transmission device, transmission method, reception device, and reception method
An FEC coder in a transmission device according to an exemplary embodiment of the present disclosure performs BCH coding and LDPC coding based on whether a code length of the LDPC coding is a 16k mode or a 64k mode. A mapper performs mapping in an I-Q coordinate to perform conversion into an FEC block, and outputs pieces of mapping data (cells). The mapper defines different non-uniform mapping patterns with respect to different code lengths even an identical coding rate is used by the FEC coder. This configuration improves a shaping gain for different error correction code lengths in a transmission technology in which modulation of the non-uniform mapping pattern is used.
1. A transmission device comprising:
a processor configured to:
perform forward error correction (FEC) coding on data to generate an FEC frame;
interleave bits included in the FEC frame to output a bit-interleaved FEC frame;
perform first mapping based on the bit-interleaved FEC frame to output first cells;
generate Layer-1 signaling information including a transmission parameter;
perform forward error correction (FEC) coding on the Layer-1 signaling information to output a Layer-1 FEC frame;
perform second mapping based on the Layer-1 FEC frame to output second cells; and
generate a transmission signal based on the first cells and the second cells; and
a transmitter configured to transmit the transmission signal,
wherein coding rates are provided for the FEC coding and the coding rates include a first coding rate and a second coding rate higher than the first coding rate,
non-uniform constellation maps are associated with the coding rates,
a first non-uniform constellation map is used when the first mapping is performed, the first non-uniform constellation map being associated with the first coding rate, and
a second non-uniform constellation map is used when the second mapping is performed, the second non-uniform constellation map being associated with the second coding rate.
2. A reception device comprising:
a receiver configured to receive the transmission signal transmitted from the transmission device according to claim 1 ; and
a processor configured to:
demodulate the transmission signal; and
perform de-mapping with the first non-uniform constellation map and the second non-uniform constellation map.