A base station characterized by comprising: an arranging unit configured to arrange a first signal generated with first information and a second signal generated with second information in different subcarriers, respectively, of a first OFDM symbol, and to arrange a third signal generated with third information in a second OFDM symbol other than the first OFDM symbol, wherein the first information and the second information are for direct use by a mobile station to determine scrambling code candidates, and wherein the third information is for use by the mobile station to select a scrambling code from the scrambling code candidates; wherein the scrambling code candidates are associated with a code group sequence set comprising a plurality of code group sequences that are mutually-orthogonal orthogonal sequences, wherein the first information is generated by multiplying a pilot signal with a first code group sequence, the second information is generated by multiplying the pilot signal with a second code group sequence, and the third information is associated with the scrambling code, and wherein the base station further comprises: a transmitting unit configured to transmit the first OFDM symbol and the second OFDM symbol, wherein the arranging unit is further configured to arrange the first signal in first subcarriers included in a first subcarrier group and to arrange the second signal in second subcarriers included in a second subcarrier group. an arranging unit configured to arrange a first signal generated with first information and a second signal generated with second information in different subcarriers, respectively, of a first OFDM symbol, and to arrange a third signal generated with third information in a second OFDM symbol other than the first OFDM symbol, wherein the first information and the second information are for direct use by a mobile station to determine scrambling code candidates, and wherein the third information is for use by the mobile station to select a scrambling code from the scrambling code candidates; wherein the scrambling code candidates are associated with a code group sequence set comprising a plurality of code group sequences that are mutually-orthogonal orthogonal sequences, wherein the first information is generated by multiplying a pilot signal with a first code group sequence, the second information is generated by multiplying the pilot signal with a second code group sequence, and the third information is associated with the scrambling code, and wherein the base station further comprises: a transmitting unit configured to transmit the first OFDM symbol and the second OFDM symbol, wherein the arranging unit is further configured to arrange the first signal in first subcarriers included in a first subcarrier group and to arrange the second signal in second subcarriers included in a second subcarrier group. a transmitting unit configured to transmit the first OFDM symbol and the second OFDM symbol, wherein the arranging unit is further configured to arrange the first signal in first subcarriers included in a first subcarrier group and to arrange the second signal in second subcarriers included in a second subcarrier group. <EOS>