Patent ID: 7133475

Claim:
A radio receiver comprising: a detecting section for performing quasi-synchronous detection on a signal that is modulated with a frame, and for outputting a baseband signal, the frame being a sequence of slots each of which includes known information and possibly includes words having a steep autocorrelation characteristic and a small and gentle crass-correlation characteristic; a synchronizing section for performing frame synchronization with a frame indicated by said baseband signal; a vector extracting section for extracting a sequence of first vectors and a sequence of second vectors by analyzing said baseband signal based on a formation of said frame, the sequence of first vectors indicating a sequence of words individually included in said slots, the sequence of second vectors indicating said known information included in said slots; a channel inferring section for obtaining an error in said first vectors and said second vectors from deviations of particular symbol positions to be indicated in a signal space by said sequence of first vectors and said sequence of second vectors; and a transmission-characteristic compensating section for compensating for an error in a vector indicating said baseband signal in said signal space, the error being obtained by said channel inferring second, wherein said vector extracting section provides a compensation for an error previously obtained by said channel inferring section to said extracted sequence of second vectors.