Design of Unstructured and Protograph-Based LDPC Coded Continuous Phase Modulation

Tarik Benaddi (1, 2, 3, 4) , Charly Poulliat (2, 3, 4) , Marie-Laure Boucheret (2, 3, 4) , Benjamin Gadat (5) , Guy Lesthievent (1)

1 CNES - Centre National d'Études Spatiales [Toulouse]
2 IRIT-SC - Signal et Communications
3 Toulouse INP - Institut National Polytechnique (Toulouse)
4 TéSA - Télécommunications Spatiales et Aéronautiques - Telecommunications for Space ant Aeronautics
5 TAS - Thales Alenia Space [Toulouse]

In this paper, we derive an asymptotic analysis and optimization of coded CPM systems using both unstructured and protograph-based LDPC codes ensembles. First, we present a simple yet effective approach to design unstructured LDPC codes : by inserting partial interleavers between LDPC and CPM, and allowing degree-1 and degree-2 variable nodes in a controlled pattern, we show that designed codes perform that can operate very close to the maximum achievable rates. Finally, the extension to protograph based codes is discussed. We provide some simple rules to design good protograph codes with good threshold properties.

Mots clés: Coded continuous phase modulation; Asymptotic analysis; Optimization of coded CPM systems

Domaines: Synthèse d'image et réalité virtuelle [cs.GR]; Traitement du signal et de l'image [eess.SP]; Traitement des images [eess.IV]; Vision par ordinateur et reconnaissance de formes [cs.CV]; Intelligence artificielle [cs.AI]

Tarik Benaddi, Charly Poulliat, Marie-Laure Boucheret, Benjamin Gadat, Guy Lesthievent. Design of Unstructured and Protograph-Based LDPC Coded Continuous Phase Modulation. IEEE International Symposium on Information Theory (ISIT 2014), Jun 2014, Honolulu, United States. pp.1982-1986, ⟨10.1109/ISIT.2014.6875180⟩. ⟨hal-03665303⟩