Analog and Digital Wireless Video Transmission: a Survey

With the development of wireless video services, more video transmission schemes have emerged. Because of the cliff effect and a rapid decline in signal quality, the traditional wireless transmission scheme for broadcast and mobile application scenarios has some disadvantages. Based on this situation, new wireless video transmission schemes are proposed. The analog scheme represented by SoftCast solves the cliff effect and has better video objective quality. However, the coding efficiency is not high. In order to further improve the quality of video broadcasting, hybrid digital-analog schemes are proposed. Hybrid digital-analog schemes combine digital coding and analog coding, which can balance coding efficiency and quality scalability. This is a survey on traditional digital scheme, analog scheme including SoftCast and ParCast, and hybrid digital analog schemes, including WSVC, DCast, WaveCast and LineCast.