This work considers the design and practical implementation of JSCC-Cast, a comprehensive analog video encoding and transmission system requiring a reduced amount of digital metadata. Suitable applications for JSCC-Cast are multicast transmissions over time-varying channels and Internet of Things wireless connectivity of end devices having severe constraints on their computational capabilities. The proposed system exhibits a similar image quality compared to existing analog and hybrid encoding alternatives such as Softcast. Its design is based on the use of linear transforms that exploit the spatial and temporal redundancy and the analog encoding of the transformed coefficients with different protection levels depending on their relevance. JSCC-Cast is compared to Softcast, which is considered the benchmark for analog and hybrid video coding, and with an all-digital H.265-based encoder. The results show that, depending on the scenario and considering image quality metrics such as the structural similarity index measure, the peak signal-to-noise ratio, and the perceived quality of the video, JSCC-Cast exhibits a performance close to that of Softcast but with less metadata and not requiring a feedback channel in order to track channel variations. Moreover, in some circumstances, the JSCC-Cast obtains a perceived quality for the frames comparable to those displayed by the digital one.

中文翻译：

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一种有限数字元数据的联合源信道编码视频编码传输系统

这项工作考虑了 JSCC-Cast 的设计和实际实现，这是一个需要减少数字元数据量的综合模拟视频编码和传输系统。JSCC-Cast 的合适应用是时变信道上的多播传输和对其计算能力有严格限制的终端设备的物联网无线连接。与现有的模拟和混合编码替代方案（如软广播）相比，所提出的系统表现出相似的图像质量。其设计基于线性变换的使用，该变换利用空间和时间冗余以及根据相关性具有不同保护级别的变换系数的模拟编码。JSCC-Cast 与 Softcast 相比，后者被认为是模拟和混合视频编码的基准，以及基于 H.265 的全数字编码器。结果表明，根据场景并考虑图像质量指标，如结构相似性指标度量、峰值信噪比和视频感知质量，JSCC-Cast 表现出接近 Softcast 的性能但元数据较少，并且不需要反馈通道来跟踪通道变化。此外，在某些情况下，JSCC-Cast 获得的帧感知质量与数字帧显示的质量相当。JSCC-Cast 表现出接近 Softcast 的性能，但元数据较少，并且不需要反馈通道来跟踪通道变化。此外，在某些情况下，JSCC-Cast 获得的帧感知质量与数字帧显示的质量相当。JSCC-Cast 表现出接近 Softcast 的性能，但元数据较少，并且不需要反馈通道来跟踪通道变化。此外，在某些情况下，JSCC-Cast 获得的帧感知质量与数字帧显示的质量相当。