Patent ID: 8279956
Filing Date: 2012-10-02
Classification: H04L

Abstract:
1. An information processing apparatus comprising: demodulation FFT processing means for carrying out an FFT (Fast Fourier Transform) process on a demodulation-related signal extracted by making use of a demodulation FFT window from every symbol of a received OFDM (Orthogonal Frequency Division Multiplexing) signal in order to convert said extracted demodulation-related signal from a time-domain signal into a frequency-domain signal and for outputting said frequency-domain signal; control FFT processing means for carrying out a process equivalent to an FFT process on a control-related signal extracted by making use of a control FFT window from every symbol of said received OFDM signal in order to convert said extracted control-related signal from a time-domain signal into a frequency-domain signal and for outputting said frequency-domain signal; transmission-line information estimation means for generating a transmission-line information estimation value by making use of an SP (Scattered Pilot) signal selected from said frequency-domain signal output by said demodulation FFT processing means; equalization means for equalizing said frequency-domain signal output by said demodulation FFT processing means and said frequency-domain signal output by said control FFT processing means by making use of said transmission-line information estimation value generated by said transmission-line information estimation means; reception-quality computation/comparison means for computing a demodulation reception quality by making use of all or a part of said frequency-domain signal generated by said demodulation FFT processing means and equalized by said equalization means and computing a control reception quality by making use of all or a part of said frequency-domain signal generated by said control FFT processing means and equalized by said equalization means and for comparing said computed demodulation reception quality with said computed control reception quality; and FFT-window position control means for controlling said demodulation FFT window to be used by said demodulation FFT processing means and said control FFT window to be used by said control FFT processing means on the basis of a comparison result produced by said reception-quality computation/comparison means.