A better way for mobile high-def video streaming

With mobile video traffic increasing significantly, research at the University of Bristol has shown how videos can be better transmitted over wireless links such as Wi-Fi and 4G.

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The study by Professor Andrew Nix and Dr Victoria Sgardoni from the university’s Communication Systems & Networks group is published in the journal, IEEE Transactions for Mobile Computing.

They propose a new approach for high-quality video transmission over wireless links, says the university. They suggest cross-packet forward error correction (FEC) codes, such as Raptor codes, are applied at the application layer (AL) to allow the AL decoder to regenerate packets that were lost over the radio and network layers.

The university writes:

The proposed methodology takes into consideration the channel resources required to accommodate the Raptor overheads. Simulation results show that packet loss is eliminated and the amount of radio resource required to transport video is reduced significantly. Automatic Repeat Request (ARQ) based unicast systems require up to 115.6 per cent more channel resources, by comparison to the researchers proposed Raptor-aware LA system without retransmissions.

Furthermore, the Raptor-aware LA system can enhance the link budget by up to 4dB, (increasing radio coverage by up to 58 per cent), and can improve total goodput by 46.7 per cent compared to a traditional ARQ-based system.

Paper: Raptor code-aware link adaptation for spectrally efficient unicast video streaming over mobile broadband networks, Victoria Sgardoni, Member, IEEE, and Andrew R. Nix, IEEE Transactions on Mobile Computing 

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