Pseudo-analog channel coding method and device based on two-dimensional chaotic coding

A technology of analog channel and coding method, which is applied in the field of pseudo-analog channel coding based on two-dimensional chaotic coding, can solve the problem of less SoftCast, achieve the effect of improving utilization ability, improving the quality of reconstructed video, and reducing the amount of transmitted data

Active Publication Date: 2021-12-10
TONGJI UNIV
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Problems solved by technology

But at present, there are few related studies on improving SoftCast from the perspective of analog channel coding.

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  • Pseudo-analog channel coding method and device based on two-dimensional chaotic coding
  • Pseudo-analog channel coding method and device based on two-dimensional chaotic coding
  • Pseudo-analog channel coding method and device based on two-dimensional chaotic coding

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Embodiment

[0054] Such as figure 1 As shown, a pseudo-analog channel coding method based on two-dimensional chaotic coding can significantly improve the bandwidth utilization ability in the case of low signal-to-noise ratio, and specifically includes the following steps:

[0055] S1. The sending end obtains the video pixel data to be transmitted, performs 3D-DCT operation on the video pixel data, obtains 3D-DCT coefficients and performs standardization processing;

[0056] S2. The low-frequency data part in the 3D-DCT coefficients is coded and protected by two-dimensional chaotic coding, and the high-frequency data part is transmitted according to the original SoftCast, and the data to be transmitted is power allocated and whitened before being sent to the receiving end;

[0057] S3. The receiving end performs LLSE decoding according to the received data, and then uses two-dimensional chaotic decoding to restore the coded low-frequency data part, performs inverse DCT operation according ...

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Abstract

The invention relates to a pseudo-analog channel coding method and device based on two-dimensional chaotic coding, and the method specifically comprises the steps: S1, enabling a transmitting end to obtain video pixel data needing to be transmitted, performing the 3D-DCT operation of the video pixel data, obtaining a 3D-DCT coefficient, and performing the standardization processing of the 3D-DCT coefficient; S2, performing coding protection on a low-frequency data part in the 3D-DCT coefficient by adopting two-dimensional chaotic coding, transmitting a high-frequency data part according to original SoftCast, performing power distribution and whitening operation on data needing to be transmitted, and then sending the data to a receiving end; S3, enabling a receiving end to perform LLSE decoding according to the received data, performing data recovery on a coded low-frequency data part by using two-dimensional chaotic decoding, performs inverse DCT operation according to a 3D-DCT coefficient obtained by decoding, and performing arrangement according to the sequence of each pixel block in video pixel data to obtain a reconstructed video. Compared with the prior art, the method has the advantages that the utilization capability of the bandwidth is remarkably improved under the condition of low signal-to-noise ratio, and the like.

Description

technical field [0001] The invention relates to the fields of pseudo-analog video transmission and analog channel coding, in particular to a pseudo-analog channel coding method and device based on two-dimensional chaotic coding. Background technique [0002] The traditional digital video transmission method has the problem of "cliff effect", which cannot meet the needs of users with different channel qualities in multicast scenarios. In order to solve the problem of "cliff effect" in digital video transmission, foreign research proposed SoftCast, a pseudo-analog video transmission scheme. On the sending side, pseudo-analog video transmission schemes use decorrelation, power allocation, and whitening to replace source coding and channel coding in digital video transmission. At the receiving end, the pseudo-analog video transmission scheme uses LLSE (Linear Least Square Estimator) decoding to replace channel decoding and source decoding in digital video transmission. Because...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/182H04N19/176H04N19/625
CPCH04N19/182H04N19/176H04N19/625Y02D30/70
Inventor 黄新林王钱袁李宇轩谢宸虓刘剑锋卞梦奇何婉宁
Owner TONGJI UNIV
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