DIGITAL VIDEO BROADCASTING SYSTEM AND METHOD FOR ESTIMATING CHANNEL THEREOF

摘要

The present invention discloses a digital video broadcasting system. The digital video broadcasting system comprises an Inverse Discrete Fourier Transform operator, a channel impulse response estimating device, a Discrete Fourier Transform operator and a first multiplier. The Inverse Discrete Fourier Transform operator performs the operation of Inverse Discrete Fourier Transform; the channel impulse response estimating device sets a window according to an output of the Inverse Discrete Fourier Transform operator; the Discrete Fourier Transform operator performs the operation of Discrete Fourier Transform on the output of the Inverse Discrete Fourier Transform operator within the window; the first multiplier multiplies the output of the Discrete Fourier Transform operator by three times to adjust the whole energy rate. The present invention also discloses a method for estimating channel of digital video broadcasting system. In the present invention, the accurate degree of channel estimation is improved, so that a larger gain could be provided when the QAM manner using higher encoding speed is adopted.