A POLAR-BASED DEMAPPER OF 8PSK DEMODULATION FOR DVB-S2 SYSTEMS

Anthony Barré (1) , Emmanuel Boutillon (2) , Neysser Blas (3) , Daniel Diaz (3)

1 Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
2 Lab-STICC_UBS_CACS_IAS
3 INICTEL-UNI - Instituto Nacional de Investigación Y Capacitación de Telecomunicaciones

In this paper, we propose a polar-based 8-PSK demapper for DVB-S2 receivers. This demapper computes the Log- Likelihood Ratio (LLR) of the transmitted bit using the polar coordinate of the received 8-PSK symbol. Thanks to interpolation and approximation, the resulting demapper outperforms the classical LLR receiver based on Cartesian coordinates. Simulation shows almost no degradation compared to the optimal LLR generation for a 5-bit input precision of the LDPC decoder.

Mots clés: Digital communication; 8-PSK; demapper; LLR computation; polar coordinates

Domaines: Electronique

Anthony Barré, Emmanuel Boutillon, Neysser Blas, Daniel Diaz. A POLAR-BASED DEMAPPER OF 8PSK DEMODULATION FOR DVB-S2 SYSTEMS. International workshop on SIgnal Processing Systems (SISP'2013), Sep 2013, Taipei, Taiwan. pp.1-5. ⟨hal-00848635⟩