Transmission method, transmission device, reception method, and reception device
View Patent ↗Provided is a precoding method for generating, from a plurality of baseband signals, a plurality of precoded signals to be transmitted over the same frequency bandwidth at the same time, including the steps of selecting a matrix F[i] from among N matrices, which define precoding performed on the plurality of baseband signals, while switching between the N matrices, i being an integer from 0 to N−1, and N being an integer at least two, generating a first precoded signal z 1 and a second precoded signal z 2 , generating a first encoded block and a second encoded block using a predetermined error correction block encoding method, generating a baseband signal with M symbols from the first encoded block and a baseband signal with M symbols the second encoded block, and precoding a combination of the generated baseband signals to generate a precoded signal having M slots.
1. A phase weight altering method comprising the steps of:
encoding a first plurality of bits to a first encoded block and a second encoded block by using a predetermined error correction block encoding method;
mapping the first encoded block to a first baseband signal s 1 with M symbols and the second encoded block to a second baseband signal s 2 with M symbols, M being an integer that is at least two;
selecting a matrix F[i] from among N matrices while switching between the N matrices, the N matrices defining phase weight altering performed on the plurality of baseband signals, i being an integer variable from 0 to (K−1), K being an integer that is at least two and less than N, and N being an integer that is at least three; and
generating a first phase weight altered signal z 1 and a second phase weight altered signal z 2 by phase weight altering, in accordance with the selected matrix F[i], the first baseband signal s 1 and the second baseband signal s 2 to be transmitted over the same frequency bandwidth at the same time, wherein
the first phase weight altered signal z 1 and the second phase weight altered signal z 2 satisfying the equation (z 1 , z 2 ) T =F[i](s 1 , s 2 ) T ,
(z 1 , z 2 ) T being a transposed vector of (z 1 , z 2 ), and
(s 1 , s 2 ) T being a transposed vector of (s 1 , s 2 ).
2. The phase weight altering method of claim 1 , wherein
the first phase weight altered signal z 1 is transmitted from a first antenna with a first frequency bandwidth at a first time,
the second phase weight altered signal z 2 is transmitted from a second antenna with the first frequency bandwidth at the first time.
3. A phase weight altering apparatus comprising:
an error correction coder that encodes a first plurality of bits to a first encoded block and a second encoded block by using a predetermined error correction block encoding method;
a mapper that maps the first encoded block to a first baseband signal s 1 with M symbols and the second encoded block to a second baseband signal s 2 with M symbols, M being an integer that is at least two;
a weighting information generator that selects a matrix F[i] from among N matrices while switching between the N matrices, the N matrices defining phase weight altering performed on the plurality of baseband signals, i being an integer variable from 0 to (K−1), K being an integer that is at least two and less than N, and N being an integer that is at least three; and
a weighting calculator that generates a first phase weight altered signal z 1 and a second phase weight altered signal z 2 by phase weight altering, in accordance with the selected matrix F[i], the first baseband signal s 1 and the second baseband signal s 2 to be transmitted over the same frequency bandwidth at the same time, wherein
the first phase weight altered signal z 1 and the second phase weight altered signal z 2 satisfy the equation (z 1 , z 2 ) T =F[i](s 1 , s 2 ) T ,
(z 1 , z 2 ) T being a transposed vector of (z 1 , z 2 ), and
(s 1 , s 2 ) T being a transposed vector of (s 1 , s 2 ).
4. The phase weight altering apparatus of claim 3 , further comprising,
the first phase weight altered signal z 1 from a first antenna with a first frequency bandwidth at a first time, and
the second phase weight altered signal z 2 from a second antenna with the first frequency bandwidth at the first time.