Joint source-channel coding with adaptation

Minh Quang Nguyen (1, 2, 3, 4) , Hang Nguyen (5, 1, 2, 4) , Eric Renault (5, 1, 2, 4) , Phan Thuan Do (5, 3, 4)

1 TSP - RS2M - Département Réseaux et Services Multimédia Mobiles
2 SAMOVAR - Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux
3 SOICT - School of Information and Communication Technology
4 CNRS - Centre National de la Recherche Scientifique
5 R3S-SAMOVAR - Réseaux, Systèmes, Services, Sécurité

According to Shannon's source-channel separation theorem, the source coding and the channel coding operations should be performed independently. However, such a method does not exploit the nature of unequiprobable source output in a finite block regime so that it can not achieve good qualities in several scenarios in practical systems. In this study, we propose a JSCC strategy which takes into account the unequiprobable source output to attain better data quality than traditional methods. An adaptation is performed in order to map source code outputs to appropriate inputs of channel code. We also propose a greedy algorithm to construct parameters for the adaptation in polynomial time. Our simulation is performed on AMR compression to estimate the effect of our approach as compared to the traditional strategy. Using this approach we find significantly improved speech quality after transmission in both cases: transfer of only one AMR codec mode and transfer of all AMR codec modes

Mots clés: Joint source channel coding; Shannon thoery; Information theory; Speech; Unequal error protection

Domaines: Réseaux et télécommunications [cs.NI]

Minh Quang Nguyen, Hang Nguyen, Eric Renault, Phan Thuan Do. Joint source-channel coding with adaptation. ICCE 2016 :6th International Conference on Communications and Electronics, Jul 2016, Halong Bay, Vietnam. pp.77 - 81, ⟨10.1109/CCE.2016.7562616⟩. ⟨hal-01446916⟩