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Video transmission scheme having end-to-end QoS guarantee in MIMO OFDM system

A video transmission and video packet technology, applied in the direction of digital video signal modification, image communication, selective content distribution, etc., can solve the problem of no real improvement of end-to-end video quality

Inactive Publication Date: 2014-03-26
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the ultimate goal of wireless communication is to provide users with end-to-end QoS guarantees, and the above-mentioned prior art solutions do not really improve the end-to-end video quality

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  • Video transmission scheme having end-to-end QoS guarantee in MIMO OFDM system

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Embodiment Construction

[0067] The technical solutions provided by the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0068] A MIMO OFDM system cross-layer video transmission scheme and system according to the present invention is characterized in that the end-to-end video transmission quality is ensured by adding a cross-layer optimization controller, and the specific working principle is to use the existing wireless link perception The algorithm senses the characteristics of the wireless link, and the cross-layer optimization controller simultaneously adjusts the video encoder and physical layer transmission parameters according to the sensing results, so as to optimize the end-to-end video quality.

[0069] figure 1 Shown is the block diagram of the H.264 / AVC-based video cross-layer transmission system proposed in this paper. The figure includes H.264 / AVC codec, cross-layer optimization controller and MIMO-OFDM system. Among them, the...

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Abstract

The invention provides a video transmission method and system having an end-to-end QoS guarantee in a MIMO OFDM system. The method includes the following steps: a step 101): the transmission packet error rate PER and the time delay of each H.264 / AVC video packet are predicted by adopting the average bit mutual information method; a step 102): an end-to-end video transmission distortion expectation value in several different combinations of video coding parameters and physical layer modulation coding parameters is estimated according to the ROPE algorithm and the video packet transmission packet error rate and the time delay predicted in the step 101); and a step 103): the corresponding video coding parameter and the corresponding modulation coding parameter when the end-to-end video distortion expectation value is minimum are taken as optimal parameters separately for the transmission of the current video. According to the invention, the end-to-end video distortion is taken as the optimization objective, the wireless link characteristics are estimated accurately, and according to the current wireless link state, the application layer coding parameters and the physical layer transmission parameters are combined to improve the end-to-end video quality so as to improve the video service experience of a user on the MIMO OFDM system.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a video transmission scheme with end-to-end QoS guarantee in MIMO OFDM system. Background technique [0002] With the rapid development of mobile Internet technology, people's demand for wireless multimedia services and applications is becoming stronger and stronger. At the same time, many new mobile communication technologies have emerged to improve system capacity and reliability. MIMOOFDM is one of them, and it is also the physical layer technology of the fourth-generation mobile communication system. Compared with wired communication systems, wireless communication systems are characterized by the time-varying nature of channel fading. Therefore, how to counteract the time-varying fading of wireless channels becomes the key to solving wireless video transmission, and the same is true for MIMO OFDM systems. [0003] The combined source-channel coding method assi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/647H04N19/164H04N19/166H04N19/156H04N21/2383
Inventor 胡亚辉吕国锋慈松
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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