digital video broadcasting terrestrial receivers include a fast fourier transformer that is configured to generate a frequency domain signal from a demodulated dvb - t signal using a range of a window , and an equalizer that is configured to equalize the frequency domain signal according to a channel selection to generate an equalized frequency domain signal . a controller is responsive to a bit error rate of the equalized frequency domain signal to control the channel selection for the equalizer , and to control the range of the window used by the fast fourier transformer .