Effects Of Filters on DVB-T Receiver Performance Under AWGN, RAYLEIGH and RICEAN Fading Channels

Digital Video Broadcasting – Terrestrial (DVB-T) has become a very popular technologyfor terrestrial digital television services. DVB-T is based on Orthogonal Frequency Division Multiplexing (OFDM) technique. OFDM is considered suitable forDVB-T system because of its low Inter-Symbol Interference (ISI). DVB-T has some limitations too including large dynamic signal range and sensitivity to frequency error. To overcome these limitations a good DVB-T receiver is a must. In this paper we address these issues. This paper has two-fold objectives (i) to investigate the performances of DVB-T system under different channel conditions, and (ii)to improve performance of DVB-T system by selecting suitable filters in receiver. To investigate the performance of DVB-T system we have considered some popular channel models namely AWGN, Rayleigh, andRicean. In order to improve the system performance some classic filters like Butterworth, Chebyshev, and elliptic have been included in the receiver. The simulation results show that a careful selection of filter is a must for a DVB-T system. It is also shown that the filter selection should be based on the underlying channel condition s.

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