Transmission device, transmission method, reception device, and reception method
View Patent ↗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 16 k mode or a 64 k 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 baseband error correction circuit configured to perform error correction coding on a baseband frame to generate a baseband error correction coded frame;
a baseband mapping circuit connected to the baseband error correction circuit and configured to map the baseband error correction coded frame to QAM (Quadrature Amplitude Modulation) symbols;
a Layer- 1 signaling circuit configured to generate Layer- 1 signaling information including a transmission parameter and configured to perform the error correction coding on the Layer- 1 signaling information to generate a Layer- 1 error correction coded frame; and
a Layer- 1 mapping circuit connected to the Layer- 1 signaling circuit to map the Layer- 1 error correction coded frame to QAM symbols, wherein
coding rates of the error correction coding are provided in stages 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, respectively,
the baseband mapping circuit is configured to use a first non-uniform constellation map in order to map the baseband error correction coded frame, the first non-uniform constellation map being associated with the first coding rate, and
the Layer- 1 mapping circuit is configured to use a second non-uniform constellation map in order to map the Layer- 1 error correction coded frame, the second non-uniform constellation map being associated with the second coding rate.
2. The transmission device according to claim 1 ,
wherein the baseband error correction coded frame has a first length of code, and
wherein the Layer- 1 error correction coded frame has a second length of code smaller than the first length of code.
3. The transmission device according to claim 2 , wherein the Layer- 1 signaling information includes the first coding rate and the first length of code.
4. The transmission device according to claim 1 , wherein the Layer- 1 signaling circuit is configured to perform at least one of:
shortening processing on the Layer- 1 signaling information before the Layer- 1 signaling circuit performs the error correction coding on the Layer- 1 signaling information; or
puncture processing on the Layer- 1 error correction coded frame after the Layer- 1 signaling circuit performs the error correction coding on the Layer- 1 signaling information.
5. The transmission device according to claim 1 , wherein the baseband frame includes video data.
6. A reception device comprising:
a receiving circuit configured to receive a signal transmitted from the transmission device according to claim 1 ;
a demodulation circuit configured to demodulate the signal; and
a de-mapping circuit configured to perform de-mapping with the first non-uniform constellation map and the second non-uniform constellation map.
7. The reception device according to claim 6 ,
wherein the baseband error correction coded frame has a first length of code, and
wherein the Layer- 1 error correction coded frame has a second length of code smaller than the first length of code.
8. The transmission device according to claim 7 , wherein the Layer- 1 signaling information includes the first coding rate and the first length of code.
9. A reception method comprising:
receiving a signal transmitted by the method according to claim 6 ;
demodulating the signal; and
performing de-mapping with the first non-uniform constellation map and the second non-uniform constellation map.
10. A transmission method comprising:
performing error correction coding on a baseband frame to generate a baseband error correction coded frame;
mapping the baseband error correction coded frame to QAM (Quadrature Amplitude Modulation) symbols;
generating Layer- 1 signaling information including a transmission parameter;
performing the error correction coding on the Layer- 1 signaling information to generate a Layer- 1 error correction coded frame; and
mapping the Layer- 1 error correction coded frame to QAM symbols, wherein
coding rates of the error correction coding are provided in stages 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, respectively,
a first non-uniform constellation map is used when the baseband error correction coded frame is mapped, the first non-uniform constellation map being associated with the first coding rate, and
a second non-uniform constellation map is used when the Layer- 1 error correction coded frame is mapped, the second non-uniform constellation map being associated with the second coding rate.
11. A transmission device comprising:
baseband error correction means for performing error correction coding on a baseband frame to generate a baseband error correction coded frame;
baseband mapping means for mapping the baseband error correction coded frame to QAM (Quadrature Amplitude Modulation) symbols;
Layer- 1 signaling means for generating Layer- 1 signaling information including a transmission parameter and for performing the error correction coding on the Layer- 1 signaling information to generate a Layer- 1 error correction coded frame; and
Layer- 1 mapping means for mapping the Layer- 1 error correction coded frame to QAM symbols, wherein
coding rates of the error correction coding are provided in stages 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, respectively,
the baseband mapping means are configured to use a first non-uniform constellation map in order to map the baseband error correction coded frame, the first non-uniform constellation map being associated with the first coding rate, and
the Layer- 1 mapping means are configured to use a second non-uniform constellation map in order to map the Layer- 1 error correction coded frame, the second non-uniform constellation map being associated with the second coding rate.