Jubran Mohammad K, Bansal Manu, Kondi Lisimachos P, Grover Rohan
Department of Electrical Engineering, Birzeit University, Birzeit, Palestine.
IEEE Trans Image Process. 2009 Jan;18(1):106-16. doi: 10.1109/TIP.2008.2006600.
In this paper, we propose an optimal strategy for the transmission of scalable video over packet-based multiple-input multiple-output (MIMO) systems. The scalable extension of H.264/AVC that provides a combined temporal, quality and spatial scalability is used. For given channel conditions, we develop a method for the estimation of the distortion of the received video and propose different error concealment schemes. We show the accuracy of our distortion estimation algorithm in comparison with simulated wireless video transmission with packet errors. In the proposed MIMO system, we employ orthogonal space-time block codes (O-STBC) that guarantee independent transmission of different symbols within the block code. In the proposed constrained bandwidth allocation framework, we use the estimated end-to-end decoder distortion to optimally select the application layer parameters, i.e., quantization parameter (QP) and group of pictures (GOP) size, and physical layer parameters, i.e., rate-compatible turbo (RCPT) code rate and symbol constellation. Results show the substantial performance gain by using different symbol constellations across the scalable layers as compared to a fixed constellation.
在本文中，我们提出了一种在基于分组的多输入多输出（MIMO）系统上传输可伸缩视频的最优策略。我们使用了提供时间、质量和空间可伸缩性组合的H.264/AVC可伸缩扩展。针对给定的信道条件，我们开发了一种估计接收视频失真的方法，并提出了不同的错误隐藏方案。与具有分组错误的模拟无线视频传输相比，我们展示了失真估计算法的准确性。在所提出的MIMO系统中，我们采用正交空时分组码（O-STBC），它保证了在分组码内不同符号的独立传输。在所提出的受限带宽分配框架中，我们使用估计的端到端解码器失真来最优地选择应用层参数，即量化参数（QP）和图像组（GOP）大小，以及物理层参数，即速率兼容Turbo（RCPT）码率和符号星座。结果表明，与固定星座相比，在可伸缩层中使用不同的符号星座可带来显著的性能提升。
