System, method, and computer program for superposition coded...

H - Electricity – 04 – W

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H04W 80/00 (2009.01)

Patent

CA 2744261

A cross-layer design architecture is provided for logical superposition coded (SPC) modulation for last-hop wireless data, aiming to overcome the effects of multi-user channel diversity in wireless video multicast. The proposed approach generates a logical SPC modulated signal by mapping successively refined information bits onto layered modulation through dynamic energy allocation and phase keying assignment, which mimics the superposition process for multiple modulated signals in convention hardware-based SPC modulation. At the receiver end, the received logical SPC signal is decoded by implementing a software-based approach on common demodulators without going through the signal-interference cancellation (SIC) process that is necessary in the conventional approach. The approach presented provides comparable or even better overall system throughput than by using the conventional hardware and SIC-based SPC modulation under various scenarios of different histograms of user channel conditions and power allocations for base and enhancement layer information.

On décrit une architecture de conception inter-couches destinée à la modulation codée par superposition (superposition coded, SPC) logique de données radio de dernier saut, visant à surmonter les effets dune diversité de canaux multiutilisateurs en multidiffusion vidéo sans fil. Lapproche proposée génère un signal modulé SPC logique en projetant des bits dinformation successivement raffinés sur une modulation stratifiée par allocation dynamique dénergie et attribution dun déplacement de phase, ce qui reproduit le processus de superposition pour des signaux modulés multiples utilisé dans la modulation SPC conventionnelle basée sur le matériel. À lextrémité réceptrice, le signal SPC logique reçu est décodé en mettant en uvre une approche basée sur le logiciel sur des démodulateurs communs sans passer par le processus dannulation des interférences entre signaux (signal-interference cancellation, SIC) nécessaire dans lapproche conventionnelle. Lapproche présentée assure un débit global du système comparable voire supérieur à celui obtenu en utilisant la modulation SPC conventionnelle basée sur le matériel et la SIC dans divers scénarios de différents histogrammes de conditions de canaux dutilisateurs et dallocations de puissance pour les informations de couches de base et denrichissement.

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