RADIO TRANSMITTER, RADIO BASE STATION, RADIO RECEIVER, COMMUNICATION TERMINAL, RADIO TRANSMITTING METHOD AND RADIO RECEIVING METHOD

摘要

A radio transmission apparatus capable of preventing a reduction of the capacity of a downlink and preventing an increase of interference inside or outside a cell involved in transmission of MCS information. In this radio transmission apparatus, the spreading code specification section 112 specifies combinations of spreading codes that will express MCS numbers. For example, the spreading code specification section 112 specifies 7 codes out of spreading codes #1 to #8. That is, if the selected MCS number is #1, the spreading code specification section 112 specifies spreading codes #2 to #8 and does not specify spreading code #1. This allows combinations of spreading codes to carry information on MCS#1 to #8. Since power corresponding to unused spreading codes is not detected through power detection of a despread signal on the receiving side, the spreading code number can be determined as the MCS number.