歐規數位電視（DVB-T）收發機制實現及實際通道之驗證

Abstract

In this thesis, an experimental platform for evaluating the performance of DVB-T system is developed. The parameters applied in Taiwan’s DTV system are used to generate the transmission signal. The Matlab simulated baseband signals are modulated by Angilent E4438C and emitted through an antenna. At the receiving side, the radiation signals are captured and down converted by Tectronix RSA 6114A and decoded by developed Matlab code. Three kinds of channel models, TU6, CT8, and SFN, with joined Doppler effects are used to verify and estimate the performance of channel estimation algorithms and interpolation methods. Base on the experimental results, the time domain correlation channel estimation method FPTC (Frequency Domain Pilot Time Domain Correlation) has better performance than traditional one tape equalization method. Besides, utilizing Franks window and FPTC channel estimation has good performance to compensate the Doppler effects. Moreover, the linear interpolation has much stable BER performance than FFT interpolations or cubic spline interpolation in most of the case. The proposed experimental platform can be used to evaluate the performance of developed algorithms or signal processing methods for improving the quality of DVB-T receivers. As a result of this thesis, we also found that further research on channel estimation and filtering algorithms are necessary to improve the performance of DVB-T receivers in high speed or long echoes’ environment.