Video signal transmission method based on power line

The invention discloses a video signal transmission method based on a power line, wherein the method can transmit video signals by using the power line. The method uses digital coding to obtain the best coding efficiency and uses analog coding to achieve gentle video quality change; through the hybrid digital and analog coding methods and the effective combination of the advantages of the two methods, power margin in digital coded modulation is used to transmit information related to an enhancement layer, so that the power utilization is improved and meanwhile the reconstruction quality of video transmission is enhanced; according to the channel condition, a target information rate is dynamically adjusted to ensure the all-weather communication reachability; under the same bandwidth condition, the transmission of different information rates is realized dynamically, the use of the bandwidth is maximized, and the communication rate and the success rate are guaranteed; and besides, in a video data decoding proce