BASE STATION APPARATUS AND RADIO COMMUNICATION METHOD

摘要

A wireless communication apparatus and method minimizes degradation in a separation characteristic of a code-multiplexed response signal using two-dimensional processing. One of plural cyclic shift values defines a reference signal sequence that is spread with an orthogonal sequence associated with one of the plural cyclic shift values. This two-dimensional processing compensates for interference affecting the reference signal.

主权项

1. A radio communication apparatus comprising:
spreading circuitry configured to spread an ACK or NACK with an orthogonal sequence, which is one of plural orthogonal sequences, and with a sequence defined by a cyclic shift value, which is one of plural cyclic shift values and which is associated with the orthogonal sequence; and a transmitter configured to transmit the ACK or NACK, wherein: each of the plural orthogonal sequences is an orthogonal sequence comprised of 4 elements; the plural orthogonal sequences include a first orthogonal sequence and a second orthogonal sequence, wherein a sequence comprised of 2 elements in the first half of the first orthogonal sequence is not orthogonal to a sequence comprised of 2 elements in the first half of the second orthogonal sequence, and a sequence comprised of 2 elements in the second half of the first orthogonal sequence is not orthogonal to a sequence comprised of 2 elements in the second half of the second orthogonal sequence; and a cyclic shift value associated with the first orthogonal sequence is different from a cyclic shift value associated with the second orthogonal sequence.