SPREAD MODULATION SIGNAL RECEIVER

摘要

PROBLEM TO BE SOLVED: To provide a spread modulation signal receiver that a high resolution signal processing section accurately applies separation and discrimination to a main signal component and a delay signal component with high time resolution by eliminating an invalid component by multiplication/division of a window function in the case of multiplication and division of a window function with a normalized signal so as to eliminate noise in the normalized signal in the time domain. SOLUTION: This spread modulation signal receiver is provided with a reception section 1 that generates a base band(BB) spread modulation signal, a reference signal generating section 4 that generates a reference signal, 1st and 2nd filters 3, 6 that limit a band width of a BB spread modulation signal and the reference signal that are respectively Fourier- transformed, a division section 7 that divides an output of the 1st filter 3 with an output of the 2nd filter to generate a normalized signal, a filter section 8 that includes a 3rd filter 21 to eliminate noise in the normalized signal, and a high resolution signal processing section 9. The filter section 8 applies, to the normalized signal, multiplication of a window function Fourier transformation, noise elimination, correction of a signal waveform, inverse Fourier transformation, limitation of the band width, and division of the window function. The 1st and 2nd filters 3, 6 have a wider bandwidth than the valid bandwidth of the normalized signal, and the 3rd filter 21 has a bandwidth equal to the valid bandwidth of the normalized signal.