Patent ID: 7450653

Claim:
A signal receiving apparatus comprising: a signal detecting section which receives an OFDM signal including a pilot carrier having a particular known complex amplitude at a predetermined carrier location, and allots each of a plurality of reception complex amplitudes obtained by detecting carrier signals included in a plurality of successive ones of OFDM symbols in a two-dimensional data domain corresponding to carrier frequency and symbol time; a transfer characteristic estimating section which estimates a reception signal transfer characteristic relative to each of the carrier signals based on a reception complex amplitude corresponding to the pilot carrier among the plurality of reception complex amplitudes allotted in the two-dimensional data domain; and a data decode section which decodes transmission data based on the reception complex amplitude and the reception signal transfer characteristics; wherein the transfer characteristic estimating section includes; a calculator which calculates pilot carrier transfer characteristics based on the reception complex amplitude corresponding to the pilot carrier among the plurality of reception complex amplitudes allotted in the two-dimensional data domain; a transformer which generates two-dimensional Fourier transformed data on a two-dimensional space corresponding to on-transmission-line delay time and on-transmission-line variation frequency by performing a two-dimensional Fourier transform on the pilot carrier transfer characteristics; a filter which selectively extracts a data group within a particular domain defined by a filter extracting domain from the two-dimensional Fourier transformed data; a supplier which supplies the filter with a setting parameter to regulate a setting position of the filter extracting domain depending upon an input instruction, the filter defining the particular domain depending upon the setting parameter; and a generator which generates two-dimensional inverse transformed data on the two-dimensional space corresponding to the carrier frequency and the symbol time by performing a two-dimensional inverse Fourier transform on the selectively extracted data group, and generates the reception signal transfer characteristic based on the generated two-dimensional inverse transformed data, wherein the setting parameter is a reference pointer representative of a domain reference point of the filter extracting domain and a domain width of the filter extracting domain.