tailieunhanh - The bit interleaved coded modulation module for DVB-NGH

This paper describes the main features of the DVBNGH Bit-Interleaved Coded Modulation (BICM) module. This latter is derived from a sub-set of DVB-T2 BICM components with additional features intended to first lower receiver complexity and power consumption and then to increase receiver robustness over mobile reception. Therefore, the long code block size was removed, a different range of coding rates was chosen, non-uniform constellations were adopted in order to provide shaping gain, and the principle of signal space diversity was extended to four-dimensional rotated constellations. Moreover the structure of the time interleaver offers the possibility to significantly increase the interleaving depth, a feature required for mobility over terrestrial and satellite links. | 19th International Conference on Telecommunications ICT 2012 The Bit Interleaved Coded Modulation Module for DVB-NGH Enhanced features for mobile reception Catherine Douillard and Charbel Abdel Nour Lab-STICC laboratory UMR CNRS 6285 Institut Mines-Télécom Télécom Bretagne Université Européenne de Bretagne Brest France @ Abstract This paper describes the main features of the DVB-NGH Bit-Interleaved Coded Modulation BICM module. This latter is derived from a sub-set of DVB-T2 BICM components with additional features intended to first lower receiver complexity and power consumption and then to increase receiver robustness over mobile reception. Therefore the long code block size was removed a different range of coding rates was chosen non-uniform constellations were adopted in order to provide shaping gain and the principle of signal space diversity was extended to four-dimensional rotated constellations. Moreover the structure of the time interleaver offers the possibility to significantly increase the interleaving depth a feature required for mobility over terrestrial and satellite links. Keywords-DVB-NGH BICM LDPC code non-uniform constellations 4D rotated constellations time interleaver. I. Introduction In 2009 when the DVB-NGH Call for Technologies 1 was issued two technical state-of-the-art DVB standards could be used as a starting point for DVB-NGH DVB-SH 2 and DVB-T2 3 . Both standards include state-of-the-art BitInterleaved Coded Modulation BICM modules. In particular they both use a capacity approaching coding scheme a turbo coding scheme is used in DVB-SH and a DVB-S2-like LDPC code was adopted in DVB-T2. Moreover the DVB-NGH Commercial Requirements 4 mention the possibility to combine DVB-NGH and DVB-T2 signals in one Radio Frequency RF channel. The natural way for this combination calls for the use of the so-called Future Extension Frames FEF of DVB-T2. Although a DVB-T2 FEF can contain BICM .