Research Of Video Multicast Based On Compressed Sensing With The AMP Reconstruction Algorithm

Nowadays,with the rapid development of the network technology and the multimedia technology,people pay more attention to the video multicast in the wireless network.Thanks to its measurements with unstructured property,it is an effective way to solve the problem of user heterogeneity with the combination of the wireless video multicast and compressed sensing.However,when the number of observing measurements is not too much and noise mixed during the transmission,it has become a worthy studying problem that how to recover the high original video quality to meet users' demand for video basic quality.So this paper studies the problem and the main work is as follows:Firstly,we propose a scheme based on BM3 D and approximate message passing for soft video multicast over wireless networks(BM3D-AMP-cast).At the encoder side,each frame is divided into blocks size of 72×88,and each block gains its measurements through observing.Then each block measurements are transmitted into OFDM channel to obtain the noisy measurements.At the decoder side,each block of each frame is recovered by the BM3D-AMP algorithm adding the motion estimation and motion compensation(MC-BM3D-AMP).Finally,blocks of each frame are combined to restore each frame of video.Experimental results show that the proposed BM3D-AMP-cast is more effective than the state-of-the-art SoftCast and DCS-cast schemes in unicast and multicast scenarios when the measurements with noise have low observing rate,viz have high packet loss rate(??9.06.0 P).Secondly,a scheme based on total variation and approximate message passing for soft video multicast over wireless networks(TV-AMP-cast),is proposed in this paper.BM3D-AMP-cast is optimized and supplemented with TV-AMP-cast.When sampled a little measurements of compress sensing,viz having extremely high packet loss rate(??95.085.0 P)during transmition,the scheme has its advantages.At the encoder side,each frame is divided into blocks size of 72×88,and each block gains its measurements through observing.Then each block measurements are transmitted into OFDM channel to obtain thenoisy measurements.At the decoder side,using TV-AMP algorithm adding the motion estimation and motion compensation(MC-TV-AMP)to recover each frame of video.Experimental results show that the proposed TV-AMP-cast plays an important role in optimizing the complement of BM3D-AMP-cast,which can meet users' demand for video basic quality in the case of extremely high packet loss rate in unicast and multicast scenarios.