A mobile device for receiving an orthogonal frequency division multiplexing, OFDM, signal, the mobile device comprising: a reception section configured to receive from a base station information of a number of subcarrier blocks to be used for a channel quality determination, each of the subcarrier blocks including a plurality of subcarriers; a subcarrier block selection section configured to select a set of preferred subcarrier blocks providing the best channel quality within a set of subcarrier blocks to be used for transmission from the base station to the mobile device, wherein the set of preferred subcarrier blocks is selected from among a restricted number of subcarriers forming a part out of all subcarriers forming the set of subcarrier blocks to be used for transmission, wherein a number of the selected preferred subcarrier blocks in the set corresponds to the information of the number of subcarrier blocks received from the base station, and wherein said number of subcarrier blocks received from the base station is less than a total number of subcarrier blocks within the set of subcarrier blocks to be used for transmission; a CQI generating section configured to generate one channel quality indicator, CQI, the generated CQI being a value representing an average channel quality across the selected preferred subcarrier blocks of the set; and a reporting section configured to transmit a signal, to the base station, the signal including the generated CQI and information indicating positions of the selected preferred subcarrier blocks of the set selected by the subcarrier block selection section, wherein the information of the number of subcarrier blocks received from the base station does not indicate positions of the subcarrier blocks to be selected. a reception section configured to receive from a base station information of a number of subcarrier blocks to be used for a channel quality determination, each of the subcarrier blocks including a plurality of subcarriers; a subcarrier block selection section configured to select a set of preferred subcarrier blocks providing the best channel quality within a set of subcarrier blocks to be used for transmission from the base station to the mobile device, wherein the set of preferred subcarrier blocks is selected from among a restricted number of subcarriers forming a part out of all subcarriers forming the set of subcarrier blocks to be used for transmission, wherein a number of the selected preferred subcarrier blocks in the set corresponds to the information of the number of subcarrier blocks received from the base station, and wherein said number of subcarrier blocks received from the base station is less than a total number of subcarrier blocks within the set of subcarrier blocks to be used for transmission; a CQI generating section configured to generate one channel quality indicator, CQI, the generated CQI being a value representing an average channel quality across the selected preferred subcarrier blocks of the set; and a reporting section configured to transmit a signal, to the base station, the signal including the generated CQI and information indicating positions of the selected preferred subcarrier blocks of the set selected by the subcarrier block selection section, wherein the information of the number of subcarrier blocks received from the base station does not indicate positions of the subcarrier blocks to be selected.