Coding and modulation apparatus using non-uniform constellation
A coding and modulation apparatus and method are presented. The apparatus comprises an encoder that encodes input data into cell words, and a modulator that modulates said cell words into constellation values of a non-uniform constellation. The modulator is configured to use, based on the total number M of constellation points of the constellation and the code rate, a non-uniform constellation from one or several groups of constellations each comprising one or more constellations.
1. A receiving apparatus comprising:
a receiver configured to receive at least one transmission stream including symbols representative of constellation values; and
at least one processor configured to
demodulate the symbols into cell words and wherein each of the symbols is associated with a point of a non-uniform constellation (NUC),
wherein the NUC includes 64 points,
wherein a first quarter of the NUC includes points defined by following real and imaginary parts:
0.5656+j0.9499
0.2750+j1.0676
0.8202+j1.2651
0.3011+j1.4529
0.9500+j0.5641
1.0666+j0.2744
1.2657+j0.8178
1.4521+j0.3005
0.3004+j0.5417
0.2430+j0.5607
0.2094+j0.3579
0.1946+j0.3566
0.5410+j0.3002
0.5596+j0.2431
0.3569+j0.2094
0.3553+j0.1948.
2. The receiving apparatus according to claim 1 , wherein a second quarter of the NUC includes 16 points, each being an opposite of a complex conjugate (−conj) of a point of the first quarter;
wherein a third quarter of the NUC includes 16 points, each being a complex conjugate (conj) of a point of the first quarter;
wherein a fourth quarter of the NUC includes 16 points, each being an opposite of a point of the first quarter.
3. The receiving apparatus according to claim 1 , wherein the at least one transmission stream is a digital video broadcasting stream.
4. The receiving apparatus according to claim 1 , wherein the at least one transmission stream is a terrestrial digital video broadcasting stream.
5. The receiving apparatus according to claim 1 , wherein the NUC is a Quadrature Amplitude Modulation (QAM) constellation.
6. The receiving apparatus according to claim 1 , wherein bits of the cell words are labeled on the NUC in accordance with a Gray mapping.
7. The receiving apparatus according to claim 1 , wherein the at least one processor is configured to decode the cell words into output data.
8. A receiving method comprising:
receiving at least one transmission stream including symbols representative of constellation values; and
demodulating the symbols into cell words, wherein each of the symbols is associated with a point of a non-uniform constellation (NUC),
wherein the NUC includes 64 points,
wherein a first quarter of the NUC includes points defined by following real and imaginary parts:
0.5656+j0.9499
0.2750+0.0676
0.8202+j1.2651
0.3011+j1.4529
0.9500+j0.5641
1.0666+j0.2744
1.2657+j0.8178
1.4521+j0.3005
0.3004+j0.5417
0.2430+j0.5607
0.2094+j0.3579
0.1946+j0.3566
0.5410+j0.3002
0.5596+j0.2431
0.3569+j0.2094
0.3553+j0.1948.
9. The receiving method according to claim 8 , wherein a second quarter of the NUC includes 16 points, each being an opposite of a complex conjugate (−conj) of a point of the first quarter,
wherein a third quarter of the NUC includes 16 points, each being a complex conjugate (conj) of a point of the first quarter, and
wherein a fourth quarter of the NUC includes 16 points, each being an opposite of a point of the first quarter.
10. The receiving method according to claim 8 , wherein the at least one transmission stream is a digital video broadcasting stream.
11. A receiving apparatus comprising:
a receiver configured to receive at least one transmission stream including symbols representative of constellation values; and
at least one processor configured to
demodulate the symbols into cell words and wherein each of the symbols is associated with a point of a non-uniform constellation (NUC),
wherein the NUC includes 64 points,
wherein a first quarter of the NUC includes points defined by following real and imaginary parts:
0.2920+j1.4827
0.2174+j1.0211
0.5702+j0.8798
1.4827+j0.2920
1.0211+j0.2174
0.8798+j0.5702
0.1475+j0.3040
0.1691+j0.3028
0.1871+j0.6855
0.3563+j0.6126
0.3040+j0.1475
0.3028+j0.1691
0.6855+j0.1871
0.6126+j0.3563.
12. The receiving apparatus according to claim 11 , wherein a second quarter of the NUC includes 16 points, each being an opposite of a complex conjugate (−conj) of a point of the first quarter,
wherein a third quarter of the NUC includes 16 points, each being a complex conjugate (conj) of a point of the first quarter, and
wherein a fourth quarter of the NUC includes 16 points, each being an opposite of a point of the first quarter.
13. The receiving apparatus according to claim 11 ,
wherein the first quarter of the NUC includes points defined by following real and imaginary parts:
0.8410+0.2563
1.2563+j0.8411.
14. The receiving apparatus according to claim 11 , wherein the at least one transmission stream is a digital video broadcasting stream.
15. The receiving apparatus according to claim 11 , wherein the at least one transmission stream is a terrestrial digital video broadcasting stream.
16. The receiving apparatus according to claim 11 , wherein the NUC is a Quadrature Amplitude Modulation (QAM) constellation.
17. The receiving apparatus according to claim 11 , wherein bits of the cell words are labeled on the NUC in accordance with a Gray mapping.
18. The receiving apparatus according to claim 11 , wherein the at least one processor is configured to decode the cell words into output data.
19. A receiving method comprising:
receiving at least one transmission stream including symbols representative of constellation values; and
demodulating the symbols into cell words, wherein each of the symbols is associated with a point of a non-uniform constellation (NUC),
wherein the NUC includes 64 points, and
wherein a first quarter of the NUC includes points defined by following real and imaginary parts:
0.2920+j 1.4827
0.2174+j1.0211
0.5702+0.8798
1.4827+j0.2920
1.0211+j0.2174
0.8798+j0.5702
0.1475+j0.3040
0.1691+j0.3028
0.1871+j0.6855
0.3563+j0.6126
0.3040+j0.1475
0.3028+j0.1691
0.6855+j0.1871
0.6126+j0.3563.
20. The receiving method according to claim 19 , wherein a second quarter of the NUC includes 16 points, each being an opposite of a complex conjugate (−conj) of a point of the first quarter,
wherein a third quarter of the NUC includes 16 points, each being a complex conjugate (conj) of a point of the first quarter, and
wherein a fourth quarter of the NUC includes 16 points, each being an opposite of a point of the first quarter.
21. The receiving method according to claim 19 ,
wherein a first quarter of the NUC includes points defined by following real and imaginary parts:
0.8410+j1.2563
1.2563+j0.8411.
22. The receiving method according to claim 19 , wherein the at least one transmission stream is a digital video broadcasting stream.