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The evolving digital televison broadcasting standard does not standardize the data rate of the transmitted data but instead leaves it completely unspecified. W e propose two digital receiver algorithms for the processing of an extended range of variable sample rates. The algorithms are compared in terms of their complexity and performance. One of the algorithms is based on filtering the received samples prior to timing synchronization, whereas the second algorithm increases the sample rate in timing recovery loop and matched filter. Both algorithms can be implemented causing negligible loss in a DVB receiver.

AbstructAn order to determine the performance of wireless data transmssion at high data rates consideration of channel transmission characteristics, intersymbol interference reduction (equalization) channel coding is necessary.In this paper, the combination of a modem combating intersymbol interference by means of decision feedback equalization and reducing bit error probability by a combination of convolutional and reed-solomon decoding and a finitebuffer ARQ protocol is discussed. It is shown that the effect of the modem on the performance of the ARQ protocol can be determined quantitatively by identifying the packet error sequence as a markoff process. Furthermore, the bumtiness of the resulting error sequence is shown to have a Limited impact on the protocol performance in terms of throughput and delay jitter.