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:
(a) spreading circuitry configured to:
spread a signal using a sequence defined by one orthogonal sequence from a first set of orthogonal sequences and one cyclic shift value among plurality of cyclic shift values to generate a first spread signal, andspread the first spread signal using another orthogonal sequence from a second set of orthogonal sequences different from the first set of orthogonal sequences to generate a second spread signal, where a number of orthogonal sequences in the second set is less than a length of one of the orthogonal sequences in the second set; and (b) a radio transmitter to transmit the second spread signal.