Patent ID: 8000226

Claim:
An OFDM reception apparatus that receives and demodulates an OFDM signal, the OFDM reception apparatus 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, for each subcarrier, 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; a collision position detection section that detects a position of data symbols colliding with each other between a plurality of cells by detecting a position 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; and a retransmission request transmission section that transmits information of the position of the data symbols colliding with each other detected by said collision position detection section to a communication partner as information for a retransmission request.