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Problem Addressed

The growing demand for wireless video multicasting is challenged by the need to scalably serve multiple receivers who have different channel characteristics. Ideally, a source would broadcast a single video stream yet deliver to each of multiple receivers a video resolution that matches its channel. However, current wireless transmission schemes cannot support smooth degradation and therefore the source is conflicted with transmitting at a high bitrate but reaching only nearby receivers, or transmitting at a low bitrate and reducing everyone to the channel quality of the worst receiver. The Inventors have developed SoftCast, an alternative approach to wireless video multicast where a sender simply broadcasts its packets without specifying a bitrate or a video resolution, but each receiver sees a video resolution scaled to its channel resources.