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Self-adaptive cross-layer forward error correction method applicable to wireless video transmission

A forward error correction, wireless video technology, applied in the direction of digital video signal modification, electrical components, image communication, etc., can solve the problem of different importance of reconstructed video quality, etc.

Inactive Publication Date: 2016-10-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This inherent hierarchical prediction structure results in different parts of the data having different importance to reconstructed video quality

Method used

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  • Self-adaptive cross-layer forward error correction method applicable to wireless video transmission
  • Self-adaptive cross-layer forward error correction method applicable to wireless video transmission
  • Self-adaptive cross-layer forward error correction method applicable to wireless video transmission

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Embodiment Construction

[0022] According to the channel conditions, such as channel average signal-to-noise ratio and carrier bandwidth, the present invention provides a design method of a cross-layer forward error correction method combining AL-FEC and PHY-FEC, and finds the best possible implementation through a heuristic search algorithm. Optimal transfer parameter values. Technical scheme of the present invention is as follows:

[0023] The present invention uses a GOP for video transmission as an optimization unit, and an optimization unit has N frames, but the importance of the N frames of images is different, and the dependencies between frames in the GOP are as follows: figure 1 shown. Among them, the I frame does not refer to other frames, the B frame refers to the adjacent I frame or P frame on both sides, and the P frame only refers to the I frame and P frame before it. In this GOP coding structure, the loss of a B frame does not affect the decoding and recovery of other frames, the loss...

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Abstract

The invention relates to a self-adaptive cross-layer forward error correction method applicable to wireless video transmission. The method comprises the steps of at a sending end of video data, predicting the magnitude of image distortion of each data packet possibly caused if packet loss occurs at a receiving end; judging the priorities of the data packets according to the caused image distortion magnitude of each data packet; selecting an encoding rate which enables protection overheads to be the fewest; solving an optimum transmission parameter value under an ideal condition; searching a feasible approximate optimum transmission parameter value under a practical condition nearby the optimum transmission parameter value under the ideal condition by employing a heuristic search algorithm; determining the optimum transmission parameter value with the goal of minimizing the minimum receiving end reconstruction video all distortion in the heuristic search algorithm; and carrying out Raptor-RCPC encoding and sending at the sending end of the video data. According to the method, the optimum video receiving quality can be obtained under the condition that the bandwidth is limited.

Description

technical field [0001] The invention belongs to the technical field of wireless video communication, and relates to the importance level division of video data and forward error correction technology of application layer and physical layer in transmission. Background technique [0002] With the vigorous development of mobile communication networks and various intelligent mobile terminals, people have more and more demands for wireless video services. However, with the explosive development of various communication services, bandwidth resources have become extremely tight, and bandwidth resources allocated to each service are very limited. In addition, the wireless signal will be affected by terrain, rain, snow, fog and other weather factors and other factors during the transmission process. Bit errors and packet loss during the transmission process are inevitable, resulting in large fluctuations in the effective transmission bandwidth. How to efficiently provide video strea...

Claims

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Application Information

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IPC IPC(8): H04N19/147H04N19/177H04N19/50
CPCH04N19/147H04N19/177H04N19/50
Inventor 侯永宏杨梦頔
Owner TIANJIN UNIV