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DVB-T2 Rotated Constellation Demapping on a GPU

Stefan Grönroos, Kristian Nybom, Jerker Björkqvist, DVB-T2 Rotated Constellation Demapping on a GPU. In: John Glossner, Lee Pucker, Stephanie Hamill (Eds.), Proceedings of SDR-WinnComm 2013: Wireless Innovation Conference and Product Exposition, 233–238, The Wireless Innovation Forum, 2013.

Abstract:

The DVB-T2 standard for digital terrestrial broadcasting supports the use of QAM (quadrature amplitude modulation) constellations where the constellation points are rotated in the I-Q plane. This combined with a cyclic delay of the Q component provides improved performance in some fading channels. The complexity of the optimal demapping process for rotated constellations is however significantly higher than for non-rotated constellations. This makes the DVB-T2 demapper one of the most computationally complex parts of a receiver. In this paper, we examine possible simplifications of the demapping process suitable for implementation on a general purpose computer containing a modern GPU (graphics processing unit). Furthermore, we measure the performance in terms of throughput of implemented algorithms. The implementations are designed to interface efficiently to a previously implemented real-time capable GPU-based LDPC (low-density parity-check) channel decoder.

BibTeX entry:

@INPROCEEDINGS{inpGrNyBj13a,
  title = {DVB-T2 Rotated Constellation Demapping on a GPU},
  booktitle = {Proceedings of SDR-WinnComm 2013: Wireless Innovation Conference and Product Exposition},
  author = {Grönroos, Stefan and Nybom, Kristian and Björkqvist, Jerker},
  editor = {Glossner, John and Pucker, Lee and Hamill, Stephanie},
  publisher = {The Wireless Innovation Forum},
  pages = {233–238},
  year = {2013},
  keywords = {DVB-T2, QAM, Demapper},
}

Belongs to TUCS Research Unit(s): Embedded Systems Laboratory (ESLAB)

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