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A video transmission method based on minimum distortion optimization in free space optical communication

A technology of video transmission and free space, which is applied in the direction of TV system adapting to optical transmission, image communication, cable transmission adaptation, etc. It can solve the problems of difficult transmission of efficient and reliable video streams, etc., so as to improve the quality of reconstructed video and minimize video distortion , Overcome the effect of high bit error rate

Active Publication Date: 2020-07-28
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] Aiming at the problem that it is difficult to transmit efficient and reliable video streams caused by atmospheric turbulence in the free space optical communication system, the present invention proposes an efficient and feasible FSO video adaptive transmission method

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  • A video transmission method based on minimum distortion optimization in free space optical communication
  • A video transmission method based on minimum distortion optimization in free space optical communication
  • A video transmission method based on minimum distortion optimization in free space optical communication

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Embodiment Construction

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0050] The invention designs a reasonable FEC redundancy allocation strategy according to the state of the FSO channel and the importance of the video scalability layer, can effectively improve the reconstructed video quality, and maximize the use of channel bandwidth resources. The structure of the FSO video adaptive transmission system of the present invention is as follows: figure 1 As shown, refer to the following steps for details:

[0051] The first step: according to the channel characteristics of FSO, the FSO channel model is built by Monte Carlo method, and the channel signal-to-noise ratio s and bandwidth are fed back to the adaptive coding module at the sending end.

[0052] Step 2: The adaptive coding module at the sending end establishes a lookup table LUT in advance through the channel state parameters, reflecting the mapping r...

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Abstract

The invention discloses a video transmission method based on minimum distortion optimization in free space optical communication. On the basis of an unequal protection ideal, a forward error correction (FEC) redundancy distribution policy for scalable video coding is designed, with the purpose of optimizing transmission distortion resulting from information source distortion and network packet loss due to video coding in an FSO system, a distortion model combined with a channel state is solved, so redundant data packet addition schemes for different scalable video coding (SVC) layers are obtained, the bad influence resulting from a high bit error rate of the FSO system is overcome, and the reestablished video quality of a receiving end is improved. According to the method, through utilization of a fast solution algorithm, a video transmission timeliness demand is ensured, and the effective method for transmitting reliable and efficient video streams through the free space optical communication is provided.

Description

technical field [0001] The invention relates to the technical field of video transmission in FSO, in particular to a video transmission method based on minimum distortion optimization in free space optical communication. Background technique [0002] Free space optical communication technology, also known as wireless optical network, is a point-to-point or point-to-multipoint information transmission technology using laser as a carrier in atmospheric space. This technology has the advantages of high bandwidth, large communication capacity, good anti-electromagnetic interference performance and good confidentiality, which makes it a new research hotspot. The biggest disadvantage of FSO communication is that the signal is particularly susceptible to the influence of the atmospheric environment during transmission, which causes problems such as power attenuation, beam drift, beam expansion, phase fluctuation, and light intensity flicker of the communication beam. [0003] In o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/177H04N19/30H04N19/147H04N7/22
CPCH04N7/22H04N19/147H04N19/177H04N19/30
Inventor 张兴军张轩董小社于博成雷鸣刘俊男
Owner XI AN JIAOTONG UNIV
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