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In this paper, block turbo codes (BTCs) with trellis-based decoding are proposed for use in digital video broadcasting-return channel via satellite (DVB-RCS) for ATM transmission. Reed-Muller (RM) codes are used as the component codes. The BTCs are shortened in order to accommodate a satellite ATM cell. It is shown that different shortening patterns can be used. In some cases, the codes have unequal error protection (UEP) property. In order to test the suitability of the proposed coding scheme from a practical point of view, the effect of channel impairment, channel signal to noise ratio (SNR) mismatch, is investigated. Simulation results for RM-turbo codes and shortened turbo codes are presented over AWGN and Rayleigh-fading channels. The performance of the shortened codes with different shortening patterns and with the effect of channel SNR mismatch are shown.