In this paper, an unequal error protection (UEP) scheme based on hierarchical quadrature amplitude modulation (HQAM) for three-dimensional (3-D) video transmission is proposed. The proposed scheme exploits unique characteristics of the color plus depth map stereoscopic video, where the color sequence has a more significant impact on the reconstructed video quality. The UEP scheme assigns more protection to the color sequence than the depth map so as to achieve high quality 3-D video. Different levels of protection are assigned through hierarchical 16-QAM. The color data with high priority (HP) are mapped onto the most significant bits (MSBs) of the 16-QAM constellation points and the depth map with low priority (LP) are mapped onto the less significant bits (LSBs). Simulation results demonstrate that the proposed UEP scheme outperforms the conventional equal error protection (EEP) schemes by up to 5 dB in terms of the received left and right views quality 1 . Index Terms -Depth image based rendering, UEP, HQAM, 3-D video transmission.
In this paper, we propose an unequal error protection (UEP) scheme for 3 dimensional (3D) video transmission based on dual AF-DF relay selection protocol. In the proposed scheme, we consider an Amplify-and-Forward (AF) and Decodeand-Forward (DF) cooperative diversity together with the unique properties of video plus depth format to improve 3D transmission over wireless networks. We assume that the relays have the ability to perfect error-checking and the source encoded each frame of 3D video data and classify it into two sequences. The former one is the color sequence which is relayed in high reliable scheme by using perfect DF relay and the latter is depth sequence which is transmitted through AF relay. Results show that the proposed scheme improved the quality of color and depth data by exploiting the relay selection diversity, where the color data has better performance than depth data due to channel reliability.
Ahstract-The visual quality obtained in wireless transmission strongly depends on the characteristics of the wireless channel and on the error resilience of the source coding.
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