Patent ID: 7626919

Claim:
An OFDM signal collision position detection apparatus that detects collision positions of OFDM signals transmitted from a plurality of cells, comprising: a known signal measuring section that measures reception power of a known signal; a data signal measuring section that measures reception power of a data signal; a data signal prediction section that predicts reception power of the data signal based on the measured reception power of the known signal; a power comparison section that compares the reception power of the data signal predicted by said data signal prediction section with the reception power of the data signal measured by said data signal measuring section for each subcarrier; and a collision position detection section that detects positions of data symbols colliding with each other between a plurality of cells by detecting positions where there is a large variation of said measured reception power of the data signal with respect to said predicted reception power of the data signal based on the comparison result obtained by said power comparison section, wherein: said collision position detection section detects a collision when said measured reception power of the data signal is greater than a first threshold in a positive direction with respect to said predicted reception power of the data signal or smaller than a second threshold in a negative direction.