Patent ID: 8073066
Filing Date: 2011-12-06
Classification: H04L

Abstract:
1. A signal receiving apparatus comprising: profile inference means for inferring a delay profile from a frequency-domain Orthogonal Frequency Division Multiplexing signal; delay-spread computation means for computing a delay spread on the basis of a delay profile inferred by said profile inference means; position determination means for determining an Fast Fourier Transform window position by making use of a time-domain Orthogonal Frequency Division Multiplexing signal or a delay profile inferred by said profile inference means; signal-by-function multiplication means for multiplying a window function formed on the basis of a delay spread computed by said delay-spread computation means and a Fast Fourier Transform window position determined by said position determination means by a time-domain Orthogonal Frequency Division Multiplexing signal representing one Orthogonal Frequency Division Multiplexing symbol in order to generate a post-multiplication time-domain Orthogonal Frequency Division Multiplexing signal; interval extraction means for extracting a guide interval from a post-multiplication time-domain Orthogonal Frequency Division Multiplexing signal generated by said signal-by-function multiplication means; interval-to-signal addition means for adding a guide interval extracted by said interval extraction means to a portion included in a post-multiplication time-domain Orthogonal Frequency Division Multiplexing signal generated by said signal-by-function multiplication means as a portion starting from a position leading ahead of the end position of an Orthogonal Frequency Division Multiplexing symbol represented by said post-multiplication time-domain Orthogonal Frequency Division Multiplexing signal along a time axis by a time distance equal to a difference obtained as a result of subtracting a time segment corresponding to a delay spread computed by said delay-spread computation means from the time segment of said guide interval; and signal processing means for carrying out a Fast Fourier Transform process on a portion included in a post-multiplication time-domain Orthogonal Frequency Division Multiplexing signal generated by said signal-by-function multiplication means and provided with a guide interval added by said interval-to-signal addition means as a portion starting from a Fast Fourier Transform window position determined by said position determination means in order to transform said post-multiplication time-domain Orthogonal Frequency Division Multiplexing signal into said frequency-domain Orthogonal Frequency Division Multiplexing signal.