Equalization device, reception device and equalization method

摘要

This equalization device and method, while preventing an expansion of circuit size, enable high-speed detection of a CIR in order to effectively achieve frequency domain equalization even when the phase of the received signal is significantly different from the phase of the known signal, and when the transmission channel has large temporal variations. A reference signal extraction unit (112) extracts both a real part component and an imaginary part component from the portion of the received signal including the known signal. A CIR detection filter unit (120) filters the known signal to generate a first processed signal and a second processed signal, detects real part filter coefficients by updating a first filter coefficient used in filtering the known signal in such a way that the first processed signal converges to the real part component, and detects imaginary part filter coefficients by filtering the known signal in such a way that the second processed signal converges to the imaginary part component. A CIR output unit (140) uses either the real part filter coefficients or the imaginary part filter coefficients to identify the channel impulse response.

主权项

1. An equalization device comprising:
a first Fourier transform unit for generating a frequency domain signal by performing a Fourier transform on a received signal including a known signal; a reference signal extraction unit for extracting, from the received signal, a real part component and an imaginary part component of a part including the known signal; a detection filter unit for executing a filtering process on the known signal to generate a first processed signal, updating first filter coefficients, when executing the filtering process on the known signal, to make the first processed signal converge to the real part component, selecting real part filter coefficients from the updated first filter coefficients, executing a filtering process on the known signal to generate a second processed signal, updating second filter coefficients, when executing the filtering process on the known signal, to make the second processed signal converge to the imaginary part component, and selecting imaginary part filter coefficients from the updated second filter coefficients; an output unit for using either the real part filter coefficients or the imaginary part filter coefficients to identify a channel impulse response; a second Fourier transform unit for generating a channel estimation signal by performing a Fourier transform on the channel impulse response; an equalization unit for generating an equalized signal by correcting the frequency domain signal on a basis of the channel estimation signal; and an inverse Fourier transform unit for generating a demodulated signal by executing an inverse Fourier transform on the equalized signal.