Base station apparatus, terminal device, transmission method, and reception method

A terminal device that communicates with a base station apparatus, comprising:

• wireless receive circuitry that receives reception signals;
• and
• despreading circuitry that performs despreading in a receive antenna direction on reception signals each received by a corresponding receive antenna;
• wherein
• a maximum spreading ratio of a spreading code with which the despreading in a receive antenna direction is performed is equal to a number of receive antennas.

A communication method in a base station apparatus that communicates with a terminal apparatus, comprising:

• a modulation step of generating modulation symbols from a bit sequence;
• a code multiplexing step of performing spreading and code multiplexing;
• and
• a precoding step of performing precoding from output of the code multiplexing step, wherein
• a maximum spreading ratio of a spreading code with which the spreading in a receive antenna direction is performed is equal to a number of receive antennas of the terminal apparatus.

A communication method in a terminal apparatus that communicates with a base station apparatus, comprising:

• a wireless receive step of receiving reception signals;
• and
• a despreading step of performing despreading in a receive antenna direction on reception signals each received by a corresponding receive antenna, wherein
• a maximum spreading ratio of a spreading code with which the despreading in the receive antenna direction is performed is equal to a number of receive antennas.