Structured Network Coding and Cooperative Wireless Ad-Hoc Peer-to-Peer Repair for WWAN Video Broadcast

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Executive Summary

In a scenario where each peer of an ad-hoc Wireless Local Area Network (WLAN) receives one of many available video streams from a Wireless Wide Area Network (WWAN), authors propose a network-coding-based cooperative repair framework for the ad-hoc peer group to improve broadcast video quality during channel losses. Specifically, they first impose network coding structures globally, and then select the appropriate video streams and network coding types within the structures locally, so that repair can be optimized for broadcast video in a rate-distortion manner. Innovative probability - the likelihood that a repair packet is useful in data recovery to a receiving peer - is analyzed in this setting for accurate optimization of the network codes.

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