Transmission device and transmission method

A terminal comprising:

• a processor;
• and
• a memory, wherein
• the processor, in operation, performs:
• generating a modulated symbol sequence from an encoded bit sequence according to first control information, the first control information indicating a modulation scheme;
• precoding two modulated symbols included in the modulated symbol sequence to generate precoded symbols according to second control information, the second control information indicating a precoding matrix selected from among precoding matrices, the precoding matrices including a first matrix and a second matrix;
• and
• transmitting the precoded symbols through antennas, wherein
• when the first matrix is selected:
• a first precoded symbol, a second precoded symbol, a third precoded symbol, and a fourth precoded symbol are generated by the precoding,
• the second precoded symbol is equal to a result of applying a phase change to the first precoded symbol, and
• the fourth precoded symbol is equal to a result of applying a phase change to the third precoded symbol, and
• when the second matrix is selected:
• a fifth precoded symbol, a sixth precoded symbol, a seventh precoded symbol, and an eighth precoded symbol are generated by the precoding,
• the fifth precoded symbol and the sixth precoded symbol are equal to the first precoded symbol and the second precoded symbol, respectively,
• the seventh precoded symbol is equal to a result of applying a phase change to the third precoded symbol, and
• the eighth precoded symbol is equal to a result of applying a phase change to the seventh precoded symbol.