Interleaving method and deinterleaving method
An interleaving method performed by a transmitter for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas is used for applying permutation to N cyclic blocks of a codeword in order to map bits of the permutated cyclic blocks onto T constellation words constituting multiple spatial-multiplexing blocks from the codeword. Each cyclic block consists of Q bits.
1. An interleaving method performed by a transmitter for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1, the interleaving method being used for applying bit permutation to bits of a codeword of a quasi-cyclic low-density parity-check code in order to generate a plurality of constellation words constituting a plurality of spatial-multiplexing blocks from the codeword,
the codeword consisting of N cyclic blocks, and each cyclic block consisting of Q bits,
each spatial-multiplexing block consisting of B bits and consisting of T constellation words,
the interleaving method comprising:
a first permutation step of permuting the N cyclic blocks of the codeword; and
a second permutation step of permuting the bits of the codeword, whose N cyclic blocks have been permuted, so as to map the bits to the T constellation words constituting each spatial-multiplexing block, wherein
T=2, N=45, Q=360, and B is 6,
the N cyclic blocks are divided into a plurality of sections each including B/2 cyclic blocks,
a transmission power ratio is 1/1,
the quasi-cyclic low-density parity-check code is a code defined by the DVB-NGH standard with a code rate of one of 7/15, 8/15, and 3/5,
the bits of each spatial-multiplexing block are divided into a 4-QAM constellation word and a 16-QAM constellation word, and
permutation in the first permutation step is applied
according to cyclic block permutation shown in Table 1, in accordance with the code rates of the quasi-cyclic low-density parity-check code:
TABLE 1
Code Rate
7/15
8/15
3/5
Section 1
1 st
13
12
32
2 nd
11
27
38
3 rd
44
14
25
Section 2
1 st
41
35
18
2 nd
24
13
28
3 rd
12
38
34
Section 3
1 st
16
7
7
2 nd
27
39
39
3 rd
14
9
15
Section 4
1 st
22
19
20
2 nd
32
43
40
3 rd
5
33
44
Section 5
1 st
17
24
19
2 nd
29
25
12
3 rd
39
10
29
Section 6
1 st
6
6
14
2 nd
35
45
17
3 rd
30
21
21
Section 7
1 st
10
2
33
2 nd
8
28
5
3 rd
37
4
24
Section 8
1 st
3
3
36
2 nd
38
17
41
3 rd
1
15
31
Section 9
1 st
7
40
10
2 nd
42
42
6
3 rd
26
22
27
Section
1 st
15
8
45
10
2 nd
28
41
42
3 rd
34
11
37
Section
1 st
9
32
13
11
2 nd
23
16
43
3 rd
43
18
11
Section
1 st
4
44
26
12
2 nd
40
31
16
3 rd
2
37
22
Section
1 st
20
30
2
13
2 nd
25
26
1
3 rd
36
29
3
Section
1 st
21
34
8
14
2 nd
33
36
30
3 rd
31
23
9
Section
1 st
18
5
23
15
2 nd
19
20
4
3 rd
45
1
35
permutation in the second permutation step is applied such that,
the two bits of the 4-QAM constellation word are made up of bits of the first cyclic block of the respective section, the two bits of the 16-QAM constellation word having the lowest reliability are made up of bits of the second cyclic block of the respective section, and the two bits of the 16-QAM constellation word having the highest reliability are made up of bits of the third cyclic block of the respective section.
2. An interleaving method performed by a transmitter for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1, the interleaving method being used for applying bit permutation to bits of a codeword of a quasi-cyclic low-density parity-check code in order to generate a plurality of constellation words constituting a plurality of spatial-multiplexing blocks from the codeword,
the codeword consisting of N cyclic blocks, and each cyclic block consisting of Q bits,
each spatial-multiplexing block consisting of B bits and consisting of T constellation words,
the interleaving method comprising:
a first permutation step of permuting the N cyclic blocks of the codeword; and
a second permutation step of permuting the bits of the codeword, whose N cyclic blocks have been permuted, so as to map the bits to the T constellation words constituting each spatial-multiplexing block, wherein
T=2, N=45, Q=360, and B is 6,
the N cyclic blocks are divided into a plurality of sections each including B/2 cyclic blocks,
a transmission power ratio is 1/2,
the quasi-cyclic low-density parity-check code is a code defined by the DVB-NGH standard with a code rate of one of 7/15, 8/15, and 3/5,
the bits of each spatial-multiplexing block are divided into a 4-QAM constellation word and a 16-QAM constellation word, and
permutation in the first permutation step is applied
according to cyclic block permutation shown in Table 4, in accordance with the code rates of the quasi-cyclic low-density parity-check code:
TABLE 4
Code Rate
7/15
8/15
3/5
Section 1
1 st
34
8
31
2 nd
13
25
43
3 rd
24
22
26
Section 2
1 st
16
18
20
2 nd
40
28
44
3 rd
19
20
39
Section 3
1 st
23
3
18
2 nd
38
23
28
3 rd
1
4
11
Section 4
1 st
28
33
37
2 nd
36
38
12
3 rd
21
19
36
Section 5
1 st
9
27
34
2 nd
6
31
42
3 rd
2
11
40
Section 6
1 st
42
6
9
2 nd
44
45
7
3 rd
8
24
21
Section 7
1 st
43
29
22
2 nd
33
39
6
3 rd
5
7
16
Section 8
1 st
22
26
27
2 nd
41
41
29
3 rd
32
2
13
Section 9
1 st
29
10
8
2 nd
45
40
30
3 rd
15
32
19
Section
1 st
18
13
38
10
2 nd
26
14
45
3 rd
37
9
32
Section
1 st
27
1
4
11
2 nd
31
34
2
3 rd
10
5
10
Section
1 st
17
35
5
12
2 nd
30
36
1
3 rd
11
21
14
Section
1 st
14
42
17
13
2 nd
20
37
41
3 rd
7
12
24
Section
1 st
3
16
35
14
2 nd
35
30
3
3 rd
4
17
23
Section
1 st
39
15
15
15
2 nd
25
44
33
3 rd
12
43
25
permutation in the second permutation step is applied such that
the two bits of the 4-QAM constellation word are made up of bits of the first cyclic block of the respective section, the two bits of the 16-QAM constellation word having the lowest reliability are made up of bits of the second cyclic block of the respective section, and the two bits of the 16-QAM constellation word having the highest reliability are made up of bits of the third cyclic block of the respective section.
3. An interleaving method performed by a transmitter for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1, the interleaving method being used for applying bit permutation to bits of a codeword of a quasi-cyclic low-density parity-check code in order to generate a plurality of constellation words constituting a plurality of spatial-multiplexing blocks from the codeword,
the codeword consisting of N cyclic blocks, and each cyclic block consisting of Q bits,
each spatial-multiplexing block consisting of B bits and consisting of T constellation words,
the interleaving method comprising:
a first permutation step of permuting the N cyclic blocks of the codeword; and
a second permutation step of permuting the bits of the codeword, whose N cyclic blocks have been permuted, so as to map the bits to the T constellation words constituting each spatial-multiplexing block, wherein
T=2, N=45, Q=360, and B is 6,
the N cyclic blocks are divided into a plurality of sections each including B/2 cyclic blocks,
a transmission power ratio is 1/4,
the quasi-cyclic low-density parity-check code is a code defined by the DVB-NGH standard with a code rate of one of 7/15, 8/15, and 3/5,
the bits of each spatial-multiplexing block are divided into a 4-QAM constellation word and a 16-QAM constellation word, and
permutation in the first permutation step is applied
according to cyclic block permutation shown in Table 7, in accordance with the code rates of the quasi-cyclic low-density parity-check code:
TABLE 7
Code Rate
7/15
8/15
3/5
Section 1
1 st
34
34
23
2 nd
13
13
5
3 rd
24
24
22
Section 2
1 st
16
16
42
2 nd
40
15
45
3 rd
19
18
20
Section 3
1 st
23
23
43
2 nd
38
32
18
3 rd
1
1
11
Section 4
1 st
28
28
27
2 nd
36
36
39
3 rd
21
21
34
Section 5
1 st
9
9
41
2 nd
6
6
37
3 rd
2
2
6
Section 6
1 st
42
42
24
2 nd
44
44
16
3 rd
8
8
8
Section 7
1 st
43
37
30
2 nd
33
33
40
3 rd
5
5
12
Section 8
1 st
22
22
35
2 nd
41
19
21
3 rd
32
14
31
Section 9
1 st
29
29
36
2 nd
45
45
10
3 rd
15
40
33
Section
1 st
18
41
44
10
2 nd
26
26
38
3 rd
37
43
14
Section
1 st
27
27
4
11
2 nd
31
31
3
3 rd
10
10
13
Section
1 st
17
17
9
12
2 nd
30
30
29
3 rd
11
11
19
Section
1 st
14
38
32
13
2 nd
20
20
15
3 rd
7
7
25
Section
1 st
3
3
28
14
2 nd
35
35
26
3 rd
4
4
17
Section
1 st
39
39
1
15
2 nd
25
25
2
3 rd
12
12
7
permutation in the second permutation step is applied such that
the two bits of the 4-QAM constellation word are made up of bits of the first cyclic block of the respective section, the two bits of the 16-QAM constellation word having the lowest reliability are made up of bits of the second cyclic block of the respective section, and the two bits of the 16-QAM constellation word having the highest reliability are made up of bits of the third cyclic block of the respective section.
4. A signal processing method performed by a receiver for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1,
the signal processing method comprising:
a demodulating step of demodulating signals based on modulation schemes and generating demodulated signals, said signals being transmitted by mapping information generated from T constellation words according to said modulation schemes that each correspond to T constellation words, each T constellation words making up one of a plurality of spatial-multiplexing blocks generated from a codeword at a transmission side, wherein
the codeword is composed of N cyclic blocks and each cyclic block is composed of Q bits, where N=45 and Q=360,
each spatial-multiplexing block is composed of B bits and T constellation words, where B=6 and T=2,
T constellation words are composed of a 4-QAM constellation word and a 16-QAM constellation word, and
a transmission power ratio is 1/1;
an LDPC decoding step of decoding, using an LDPC decoder, the demodulated signals based on a quasi-cyclic low-density parity-check code used at the transmission side among quasi-cyclic low-density parity-check codes having code rates of 7/15, 8/15, and 3/5 as defined by the DVB-NGH standard; and
an output step of outputting the demodulated signal to the LDPC decoder, based on rules used (i) in permutation of the N cyclic blocks of the codeword performed based on Table 1 according to the first permutation step performed by the interleaving method defined in claim 1 and (ii) in bit permutation of the codeword after permutation of the N cyclic blocks performed according to the second permutation step performed by the interleaving method defined in claim 1 .
5. An interleaver provided in a transmitter for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1, the interleaver applying bit permutation to bits of a codeword of a quasi-cyclic low-density parity-check code in order to generate a plurality of constellation words of a plurality of spatial-multiplexing blocks from the codeword,
the codeword consisting of N cyclic blocks, each cyclic block consisting of Q bits,
each spatial-multiplexing block consisting of B bits and consisting of T constellation words,
the interleaver comprising:
a first permutation unit that permutes the N cyclic blocks to obtain a permuted codeword in which a sequence of the N cyclic blocks is permuted; and
a second permutation unit that permutes the bits of the permuted codeword to map the bits to the T constellation words constituting the spatial-multiplexing block, wherein
T=2, N=45, Q=360, and B is 6,
the N cyclic blocks are divided into a plurality of sections each including B/2 cyclic blocks,
a transmission power ratio is 1/1,
the quasi-cyclic low-density parity-check code is a code defined by the DVB-NGH standard with a code rate of one of 7/15, 8/15, and 3/5,
the bits of each spatial-multiplexing block are divided into a 4-QAM constellation word and a 16-QAM constellation word, and
permutation by the first interleaving unit is applied
according to cyclic block permutation shown in Table 1, in accordance with the code rates of the quasi-cyclic low-density parity-check code:
TABLE 1
Code Rate
7/15
8/15
3/5
Section 1
1 st
13
12
32
2 nd
11
27
38
3 rd
44
14
25
Section 2
1 st
41
35
18
2 nd
24
13
28
3 rd
12
38
34
Section 3
1 st
16
7
7
2 nd
27
39
39
3 rd
14
9
15
Section 4
1 st
22
19
20
2 nd
32
43
40
3 rd
5
33
44
Section 5
1 st
17
24
19
2 nd
29
25
12
3 rd
39
10
29
Section 6
1 st
6
6
14
2 nd
35
45
17
3 rd
30
21
21
Section 7
1 st
10
2
33
2 nd
8
28
5
3 rd
37
4
24
Section 8
1 st
3
3
36
2 nd
38
17
41
3 rd
1
15
31
Section 9
1 st
7
40
10
2 nd
42
42
6
3 rd
26
22
27
Section
1 st
15
8
45
10
2 nd
28
41
42
3 rd
34
11
37
Section
1 st
9
32
13
11
2 nd
23
16
43
3 rd
43
18
11
Section
1 st
4
44
26
12
2 nd
40
31
16
3 rd
2
37
22
Section
1 st
20
30
2
13
2 nd
25
26
1
3 rd
36
29
3
Section
1 st
21
34
8
14
2 nd
33
36
30
3 rd
31
23
9
Section
1 st
18
5
23
15
2 nd
19
20
4
3 rd
45
1
35
permutation by the second permutation unit is applied such that,
the two bits of the 4-QAM constellation word are made up of bits of the first cyclic block of the respective section, the two bits of the 16-QAM constellation word having the lowest reliability are made up of bits of the second cyclic block of the respective section, and the two bits of the 16-QAM constellation word having the highest reliability are made up of bits of the third cyclic block of the respective section.
6. A signal processor provided in a receiver for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1, wherein
the signal processor comprising:
a demodulator configured to demodulate signals based on modulation schemes and generate demodulated signals, said signals being transmitted by mapping information generated from T constellation words according to said modulation schemes that each correspond to T constellation words, each T constellation words making up one of a plurality of spatial-multiplexing blocks generated from a codeword at a transmission side, wherein
the codeword is composed of N cyclic blocks and each cyclic block is composed of Q bits, where N=45 and Q=360,
each spatial-multiplexing block is composed of B bits and T constellation words, where B=6 and T=2,
T constellation words are composed of a 4-QAM constellation word and a 16-QAM constellation word, and
a transmission power ratio is 1/1;
an LDPC decoder configured to decode the demodulated signals based on a quasi-cyclic low-density parity-check code used at the transmission side among quasi-cyclic low-density parity-check codes having code rates of 7/15, 8/15, and 3/5 as defined by the DVB-NGH standard; and
an outputter configured to output the demodulated signal to the LDPC decoder, based on rules used (i) in permutation of the N cyclic blocks of the codeword performed based on Table 1 according to the first permutation unit of the interleaver defined in claim 5 and (ii) in bit permutation of the codeword after permutation of the N cyclic blocks performed according to the second permutation unit of the interleaver defined in claim 5 .
7. A signal processing method performed by a receiver for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1,
the signal processing method comprising:
a demodulating step of demodulating signals based on modulation schemes and generating demodulated signals, said signals being transmitted by mapping information generated from T constellation words according to said modulation schemes that each correspond to T constellation words, each T constellation words making up one of a plurality of spatial-multiplexing blocks generated from a codeword at a transmission side, wherein
the codeword is composed of N cyclic blocks and each cyclic block is composed of Q bits, where N=45 and Q=360,
each spatial-multiplexing block is composed of B bits and T constellation words, where B=6 and T=2,
T constellation words are composed of a 4-QAM constellation word and a 16-QAM constellation word, and
a transmission power ratio is 1/2;
an LDPC decoding step of decoding, using an LDPC decoder, the demodulated signals based on a quasi-cyclic low-density parity-check code used at the transmission side among quasi-cyclic low-density parity-check codes having code rates of 7/15, 8/15, and 3/5 as defined by the DVB-NGH standard; and
an output step of outputting the demodulated signal to the LDPC decoder, based on rules used (i) in permutation of the N cyclic blocks of the codeword performed based on Table 4 according to the first permutation step performed by the interleaving method defined in claim 2 and (ii) in bit permutation of the codeword after permutation of the N cyclic blocks performed according to the second permutation step performed by the interleaving method defined in claim 2 .
8. A signal processing method performed by a receiver for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1,
the signal processing method comprising:
a demodulating step of demodulating signals based on modulation schemes and generating demodulated signals, said signals being transmitted by mapping information generated from T constellation words according to said modulation schemes that each correspond to T constellation words, each T constellation words making up one of a plurality of spatial-multiplexing blocks generated from a codeword at a transmission side, wherein
the codeword is composed of N cyclic blocks and each cyclic block is composed of Q bits, where N=45 and Q=360,
each spatial-multiplexing block is composed of B bits and T constellation words, where B=6 and T=2,
T constellation words are composed of a 4-QAM constellation word and a 16-QAM constellation word, and
a transmission power ratio is 1/4;
an LDPC decoding step of decoding, using an LDPC decoder, the demodulated signals based on a quasi-cyclic low-density parity-check code used at the transmission side among quasi-cyclic low-density parity-check codes having code rates of 7/15, 8/15, and 3/5 as defined by the DVB-NGH standard; and
an output step of outputting the demodulated signal to the LDPC decoder, based on rules used (i) in permutation of the N cyclic blocks of the codeword performed based on Table 7 according to the first permutation step performed by the interleaving method defined in claim 3 and (ii) in bit permutation of the codeword after permutation of the N cyclic blocks performed according to the second permutation step performed by the interleaving method defined in claim 3 .
9. An interleaver provided in a transmitter for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1, the interleaver applying bit permutation to bits of a codeword of a quasi-cyclic low-density parity-check code in order to generate a plurality of constellation words of a plurality of spatial-multiplexing blocks from the codeword,
the codeword consisting of N cyclic blocks, each cyclic block consisting of Q bits,
each spatial-multiplexing block consisting of B bits and consisting of T constellation words,
the interleaver comprising:
a first permutation unit that permutes the N cyclic blocks to obtain a permuted codeword in which a sequence of the N cyclic blocks is permuted; and
a second permutation unit that permutes the bits of the permuted codeword to map the bits to the T constellation words constituting the spatial-multiplexing block, wherein
T=2, N=45, Q=360, and B is 6,
the N cyclic blocks are divided into a plurality of sections each including B/2 cyclic blocks,
a transmission power ratio is 1/2,
the quasi-cyclic low-density parity-check code is a code defined by the DVB-NGH standard with a code rate of one of 7/15, 8/15, and 3/5,
the bits of each spatial-multiplexing block are divided into a 4-QAM constellation word and a 16-QAM constellation word, and
permutation by the first permutation unit is applied
according to cyclic block permutation shown in Table 4, in accordance with the code rates of the quasi-cyclic low-density parity-check code:
TABLE 4
Code Rate
7/15
8/15
3/5
Section 1
1 st
34
8
31
2 nd
13
25
43
3 rd
24
22
26
Section 2
1 st
16
18
20
2 nd
40
28
44
3 rd
19
20
39
Section 3
1 st
23
3
18
2 nd
38
23
28
3 rd
1
4
11
Section 4
1 st
28
33
37
2 nd
36
38
12
3 rd
21
19
36
Section 5
1 st
9
27
34
2 nd
6
31
42
3 rd
2
11
40
Section 6
1 st
42
6
9
2 nd
44
45
7
3 rd
8
24
21
Section 7
1 st
43
29
22
2 nd
33
39
6
3 rd
5
7
16
Section 8
1 st
22
26
27
2 nd
41
41
29
3 rd
32
2
13
Section 9
1 st
29
10
8
2 nd
45
40
30
3 rd
15
32
19
Section
1 st
18
13
38
10
2 nd
26
14
45
3 rd
37
9
32
Section
1 st
27
1
4
11
2 nd
31
34
2
3 rd
10
5
10
Section
1 st
17
35
5
12
2 nd
30
36
1
3 rd
11
21
14
Section
1 st
14
42
17
13
2 nd
20
37
41
3 rd
7
12
24
Section
1 st
3
16
35
14
2 nd
35
30
3
3 rd
4
17
23
Section
1 st
39
15
15
15
2 nd
25
44
33
3 rd
12
43
25
permutation by the second permutation unit is applied such that
the two bits of the 4-QAM constellation word are made up of bits of the first cyclic block of the respective section, the two bits of the 16-QAM constellation word having the lowest reliability are made up of bits of the second cyclic block of the respective section, and the two bits of the 16-QAM constellation word having the highest reliability are made up of bits of the third cyclic block of the respective section.
10. An interleaver provided in a transmitter for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1, the interleaver applying bit permutation to bits of a codeword of a quasi-cyclic low-density parity-check code in order to generate a plurality of constellation words of a plurality of spatial-multiplexing blocks from the codeword,
the codeword consisting of N cyclic blocks, each cyclic block consisting of Q bits,
each spatial-multiplexing block consisting of B bits and consisting of T constellation words,
the interleaver comprising:
a first permutation unit that permutes the N cyclic blocks to obtain a permuted codeword in which a sequence of the N cyclic blocks is permuted; and
a second permutation unit that permutes the bits of the permuted codeword to map the bits to the T constellation words constituting the spatial-multiplexing block, wherein
T=2, N=45, Q=360, and B is 6,
the N cyclic blocks are divided into a plurality of sections each including B/2 cyclic blocks,
a transmission power ratio is 1/4,
the quasi-cyclic low-density parity-check code is a code defined by the DVB-NGH standard with a code rate of one of 7/15, 8/15, and 3/5,
the bits of each spatial-multiplexing block are divided into a 4-QAM constellation word and a 16-QAM constellation word, and
permutation by the first permutation unit is applied
according to cyclic block permutation shown in Table 7, in accordance with the code rates of the quasi-cyclic low-density parity-check code:
TABLE 7
Code Rate
7/15
8/15
3/5
Section 1
1 st
34
34
23
2 nd
13
13
5
3 rd
24
24
22
Section 2
1 st
16
16
42
2 nd
40
15
45
3 rd
19
18
20
Section 3
1 st
23
23
43
2 nd
38
32
18
3 rd
1
1
11
Section 4
1 st
28
28
27
2 nd
36
36
39
3 rd
21
21
34
Section 5
1 st
9
9
41
2 nd
6
6
37
3 rd
2
2
6
Section 6
1 st
42
42
24
2 nd
44
44
16
3 rd
8
8
8
Section 7
1 st
43
37
30
2 nd
33
33
40
3 rd
5
5
12
Section 8
1 st
22
22
35
2 nd
41
19
21
3 rd
32
14
31
Section 9
1 st
29
29
36
2 nd
45
45
10
3 rd
15
40
33
Section
1 st
18
41
44
10
2 nd
26
26
38
3 rd
37
43
14
Section
1 st
27
27
4
11
2 nd
31
31
3
3 rd
10
10
13
Section
1 st
17
17
9
12
2 nd
30
30
29
3 rd
11
11
19
Section
1 st
14
38
32
13
2 nd
20
20
15
3 rd
7
7
25
Section
1 st
3
3
28
14
2 nd
35
35
26
3 rd
4
4
17
Section
1 st
39
39
1
15
2 nd
25
25
2
3 rd
12
12
7
permutation by the second permutation unit is applied such that
the two bits of the 4-QAM constellation word are made up of bits of the first cyclic block of the respective section, the two bits of the 16-QAM constellation word having the lowest reliability are made up of bits of the second cyclic block of the respective section, and the two bits of the 16-QAM constellation word having the highest reliability are made up of bits of the third cyclic block of the respective section.
11. A signal processor provided in a receiver for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1, wherein
the signal processor comprising:
a demodulator configured to demodulate signals based on modulation schemes and generate demodulated signals, said signals being transmitted by mapping information generated from T constellation words according to said modulation schemes that each correspond to T constellation words, each T constellation words making up one of a plurality of spatial-multiplexing blocks generated from a codeword at a transmission side, wherein
the codeword is composed of N cyclic blocks and each cyclic block is composed of Q bits, where N=45 and Q=360,
each spatial-multiplexing block is composed of B bits and T constellation words, where B=6 and T=2,
T constellation words are composed of a 4-QAM constellation word and a 16-QAM constellation word, and
a transmission power ratio is 1/2;
an LDPC decoder configured to decode the demodulated signals based on a quasi-cyclic low-density parity-check code used at the transmission side among quasi-cyclic low-density parity-check codes having code rates of 7/15, 8/15, and 3/5 as defined by the DVB-NGH standard; and
an outputter configured to output the demodulated signal to the LDPC decoder, based on rules used (i) in permutation of the N cyclic blocks of the codeword performed based on Table 4 according to the first permutation unit of the interleaver defined in claim 9 and (ii) in bit permutation of the codeword after permutation of the N cyclic blocks performed according to the second permutation unit of the interleaver defined in claim 9 .
12. A signal processor provided in a receiver for a communication system with quasi-cyclic low-density parity-check codes, spatial multiplexing, and T transmit antennas, T being an integer greater than 1, wherein
the signal processing comprising:
a demodulator configured to demodulate signals based on modulation schemes and generate demodulated signals, said signals being transmitted by mapping information generated from T constellation words according to said modulation schemes that each correspond to T constellation words, each T constellation words making up one of a plurality of spatial-multiplexing blocks generated from a codeword at a transmission side, wherein
the codeword is composed of N cyclic blocks and each cyclic block is composed of Q bits, where N=45 and Q=360,
each spatial-multiplexing block is composed of B bits and T constellation words, where B=6 and T=2,
T constellation words are composed of a 4-QAM constellation word and a 16-QAM constellation word, and
a transmission power ratio is 1/4;
an LDPC decoder configured to decode the demodulated signals based on a quasi-cyclic low-density parity-check code used at the transmission side among quasi-cyclic low-density parity-check codes having code rates of 7/15, 8/15, and 3/5 as defined by the DVB-NGH standard; and
an outputter configured to output the demodulated signal to the LDPC decoder, based on rules used (i) in permutation of the N cyclic blocks of the codeword performed based on Table 7 according to the first permutation unit of the interleaver defined in claim 10 and (ii) in bit permutation of the codeword after permutation of the N cyclic blocks performed according to the second permutation unit of the interleaver defined in claim 10 .