WIRELESS COMMUNICATION APPARATUS AND RESPONSE SIGNAL SPREADING METHOD

摘要

A wireless communication apparatus capable of minimizing the degradation of the separation characteristic of response signals to be code-multiplexed. In the apparatus, a control part (209) controls both a ZC sequence to be us ed for the primary spread in a spreading part (214) and a Walsh sequence to be used for the secondary spread in a spreading part (217) according to the associations between sequences and CCEs established in accordance with the p robability of using response signal physical-resources corresponding to CCE numbers. The spreading part (214) performs the primary spread of the respons e signal by use of the ZC sequence established by the control part (209). Th e spreading part (217) performs the secondary spread of the response signal, to which CP has been added, by use of the Walsh sequence established by the control part (209).