DVB-T2 Streams



The DVB-T2 Reference Streams

Version: 1.1 (11th August, 2011)

1. Overview and scope

The present document describes the generation of reference streams used for the verification and the validation of the DVB-T2 specification. The methods were developed by the verification and validation (V&V) group of DVB TM-T2 to ensure that the specification was unambiguous and that all companies involved had the same understanding of it. The resulting streams are now being released publicly to allow other implementers to verify their implementations.

This document defines reference streams generated at different test points in the modulator chain and for different test cases. The parameters of the test cases are defined in a spreadsheet. During the V&V process, each company generated its own reference streams at some or all of the test points for each test cases and compared them against the streams generated by the other companies. The crosschecking started from the input and will gradually advance towards the output. The released streams have all been verified by several independent implementations.

First, the modulator block diagram is introduced, together with the definition of the test points at which streams are generated. Next, the input stream generation is described, comprising the generation of input packets and the assembly of these packets into input Transport Streams. In order to give a deterministic output signal to compare, the implementation of certain non-prescriptive parts of the specification are then defined. Some test cases involve FEFs, and the content of these are defined. Next, the stream file format is defined, supporting the various data types in the modulator chain. The structure of the file format is then presented.

The present document was based on a working document of the V&V group.

2. Block diagram and test points

The block diagram of the DVB-T2 modulator is shown in Figure 1, together with the test points at which streams are generated. The input generator and processing, as well as the bit-interleaved coding and modulation (BICM) are PLP specific, i.e. one per PLP, whereas the frame builder and the OFDM generation are common. In MISO mode there are two paths starting from the output of the ―MISO Processing‖ block.

The two paths are identical, except for the ―Cell Multiplexer‖ block, which is slightly different for the two transmitters.

The ―Annex D Splitting‖ block will have no effect when common PLPs are not used and test point 0 need not be generated in this case.

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