Abstract: A multicarrier radio communication technology that enables radio resources to be used effectively, interference-to be suppressed, and a cell search to be performed at high speed, in a multicarrier CDMA system. In this technology, a secondary synchronization code (S-SCH signal) for identifying the group of scrambling codes divided into groups beforehand is frequency multiplexed in a plurality of subcarriers. A secondary synchronization code is coded in the time direction. Subcarriers in which a secondary synchronization code is multiplexed are mutually separated and equally spaced. The number of subcarriers in which a secondary synchronization code is multiplexed can be set to a small value with respect to the total number of subcarriers. A secondary synchronization code is an orthogonal code. On the receiving side, a cell search is carried out using such a frequency multiplexed type S-SCH.

Abstract: A replica generation section 103 performs multicarrier demodulation of a known signal of a received signal and generates a replica. A delay profile generation section 104 calculates a correlation value between the replica and the received signal and generates a delay profile. An integral value calculation section 105 integrates the correlation values for each fixed range of the delay profile and calculates a plurality of integral values. A maximum integral value detection section 106 detects the maximum integral value, which is the maximum value of the integral values. A demodulation timing detection section 107 detects the demodulation timing at which multicarrier demodulation is performed from the position of the maximum integral value.

Abstract: A multicarrier radio communication technology that enables radio resources to be used effectively, interference-to be suppressed, and a cell search to be performed at high speed, in a multicarrier CDMA system. In this technology, a secondary synchronization code (S-SCH signal) for identifying the group of scrambling codes divided into groups beforehand is frequency multiplexed in a plurality of subcarriers. A secondary synchronization code is coded in the time direction. Subcarriers in which a secondary synchronization code is multiplexed are mutually separated and equally spaced. The number of subcarriers in which a secondary synchronization code is multiplexed can be set to a small value with respect to the total number of subcarriers. A secondary synchronization code is an orthogonal code. On the receiving side, a cell search is carried out using such a frequency multiplexed type S-SCH.

Abstract: An averaging block (101) calculates a moving average of a correlation value calculated. A scale factor multiplication block (102) multiplies the correlation value which has been moving-averaged by a predetermined scale factor. An ideal correlation value generation block (103) calculates an ideal correlation value by using a reception signal in a line state having no level fluctuation due to fading fluctuation or no noise or no delayed wave and a known signal identical to a known signal contained in the reception signal. A time shifting block (104) outputs the ideal correlation value shifted on a temporal axis to a square error detection block (105). The square error detection block (105) detects a square error between the correlation value from the scale factor multiplication block (102) and the ideal correlation value from the time shifting block (104). A minimum error detection block (106) detects a minimum value of the detected square error, i.e., a minimum square error.