Abstract
This article introduces a method for efficiently transmitting medium grain scalable video packets over a transmission path consisting of multiple wireless links. Medium grain scalability provides bit rate adaptation according to the available bit rate by dropping a number of video packets in the compressed bit stream. In other words, rate-distortion control can be achieved by means of packet transmission control. The available bit rate and the spectral efficiency are determined by the bandwidth and the modulation level, respectively. Accordingly, the number of packets available for transmission is affected by the modulation level of the packets. However, if we consider modulation levels with higher spectral efficiency in order to increase the number of packets and reduce the expected video distortion, the packet error rate of the transmitted packets can also be increased because the spectrally efficient modulation levels are sensitive to channel noise. This is another reason for the increment in expected video distortion, because the erroneous received packets cannot be used for video reconstruction. Therefore, this article considers the minimization of expected video distortion by the optimization of two factors--packet extraction for transmission and modulation level allocation for the extracted packets. Packet extraction is optimized for the path between the source and destination nodes, whereas the modulation level for each extracted packet is optimized for each link along the transmission path.
Highlights
Scalable video coding (SVC), as standardized by the joint video team of the international telecommunication union–telecommunication standardization sector (ITU-T) and the international organization for standardization/ international electro-technical commission (ISO/IEC) [1], is a video compression method that can bandwidth-efficiently support multiple spatial-temporal resolutions for a single video
A predefined transmission time is reserved for each node, and the remaining time for each node is an important factor for these cross-layer optimization (CLO) designs
We focus on the modulation levels of the links according to their channel state information (CSI) in terms of the received signal-to-noise ratio (SNR)
Summary
Scalable video coding (SVC), as standardized by the joint video team of the international telecommunication union–telecommunication standardization sector (ITU-T) and the international organization for standardization/ international electro-technical commission (ISO/IEC) [1], is a video compression method that can bandwidth-efficiently support multiple spatial-temporal resolutions for a single video It supports a multi-bit rate feature that can be adapted to network or channel variations. The crosslayer optimization (CLO) designs of [13-15] are introduced for a video streaming service These designs, including optimal path selection, assume a sufficient number of intermediate nodes, so that if the quality of a link in one path degrades, an alternative path can be substituted. We focus on the modulation levels of the links according to their channel state information (CSI) in terms of the received signal-to-noise ratio (SNR) This rest of the article is organized as follows.
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