BBC R&D

Abstract

The DVB-T2 specification whilst functional being the specification of a transmitted on-air signal, includes a detailed specification for a model of the buffer used by the receiver to store data prior to outputting it - the Receiver Buffer Model (RMB). Whilst the basics of this model and how it is used are described in the T2 implementation guidelines that document does not give a detailed explanation of the underlying theory, nor the derivation of the associated formulae. This White Paper therefore adds a considerable amount of detail to that available in the implementation guidelines. This paper starts by explaining why such a model is needed in the specification and how it helps optimise the use of the parameters of the system. It then described the underlying theory, which explains how to calculate allowable combinations of parameters and so create a mode of operation which is fully compliant with the specification. Finally, this paper explains how the RBM has been modellled in the T2 common simulation platform (CSP-see both in terms of checking the input parameters against the rules developed here, and then verifying that for a given input an accurate model of the RBM will indeed operate correctly without causing overflow or underflow in the receiver.

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