Signal processing device, signal processing method, and program

摘要

Disclosed is a signal processing device that reduces the influence of an interfering wave to suppress the deterioration of a BER even if narrow-band noise is included in a communication band. In the signal processing device, which is capable of performing an FFT and performing a window function process as preprocessing before the FFT and achieves OFDM demodulation, the window function process is skipped to perform an FFT on a received signal if the frequency of narrow-band noise included in the received signal coincides with the subcarrier frequency of OFDM within a predetermined range. If the frequencies do not coincide with each other, the FFT is performed after the window function process is performed on the received signal. The signal processing device includes an NBN detection/determination section, which determines whether narrow-band noise is included in a subcarrier, and a window function determination section, which determines, in accordance with the degree of coincidence between the frequency of narrow-band noise and the frequency of a subcarrier, whether or not to perform the window function process.

主权项

1. A signal processing device that outputs received data upon receipt of a modulated signal that is orthogonal frequency division modulated by a plurality of subcarriers, the signal processing device comprising:
a processor; and a memory storing instructions which cause the processor to execute:
an input section that extracts a predetermined number of input data from the modulated signal that is in a time series;a window function processing section that exercises control to determine whether or not to perform a window function process on the predetermined number of input data;an FFT processing section that performs an FFT process on data output from the window function processing section; anda narrow-band noise detection/determination section that detects a degree of coincidence between a frequency of narrow-band noise included in the modulated signal and a plurality of frequencies of the subcarriers, and exercises control to determine in accordance with the detected degree of coincidence whether the window function processing section should perform the window function process on the input data and supply the resulting processed data to the FFT processing section or supply the input data to the FFT processing section without performing the window function process on the input data.