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Video softcast method based on channel characteristic

A technology of channel characteristics and video, applied in the field of video coding and decoding and wireless transmission, can solve the problem that the video soft broadcast scheme does not consider the channel characteristics, etc.

Active Publication Date: 2015-10-21
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] The purpose of the present invention is to provide stronger protection to video data at the physical layer according to the actual transmission channel characteristics in the fading channel, to effectively overcome the shortcomings of the existing video softcasting scheme that does not consider the channel characteristics, and to provide a method that ultimately improves the video quality. Video soft broadcasting method based on channel characteristics to restore quality

Method used

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  • Video softcast method based on channel characteristic
  • Video softcast method based on channel characteristic
  • Video softcast method based on channel characteristic

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specific Embodiment approach

[0086] The specific operation steps are:

[0087] 1. The coding end comprises DCT, energy distribution, Hadamard transform, specifically comprises the following steps:

[0088] The first step: read in the video sequence, and divide each frame of image into multiple non-overlapping image blocks of 8×8 size;

[0089] Second step: perform DCT on each 8×8 video block to obtain DCT coefficients, and divide the DCT coefficients into 64 frequency subbands, wherein the kth subband is denoted as x(k);

[0090] Step 3: Perform power allocation on x(k) to minimize the reconstruction error and obtain x a0 (k):

[0091] x a0 (k)=g(k) x(k) (1)

[0092] in, is the energy distribution scaling factor, P is the total power of the DCT coefficients, σ x(j) is the standard deviation of the jth subband of the DCT coefficients;

[0093] Step 4: pair x a0 (k) Perform Hadamard transformation to generate data with the same importance

[0094] y → ...

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Abstract

The invention relates to a video softcast method based on a channel characteristic. According to the method, subcarriers of the highest quality of a video data allocation channel are transmitted in a physical layer, and a decoding terminal uses a linear least square estimator (LLSE) to denoise and uses zero forcing decision feedback equalization (ZF-DFE) to decode, so that the video recovery quality is improved finally. The video softcast method comprises following steps that a coding terminal reads in a video sequence and partitions images, removes intra-frame redundancy through discrete cosine transformation (DCT), performs power distribution so as to minimize reconstruction errors, and finally generates data of the same significance through hadamard transform; acquired data packages are sent into orthogonal frequency division multiplexing (OFDM), data of each package is simply modulated firstly so as to form a series of symbols, subcarriers are allocated according to CSI transmitted by a feedback channel, serial-parallel conversion, inverse fast fourier transform (IFFT), cyclic prefix insertion and parallel-serial conversion are performed on the symbols so as to obtain OFDM transmission symbols, and the transmission symbols are transmitted into additive white Gaussian noise (AWGN) to be sent to a receiving terminal; the process of the receiving terminal is opposite to the process of a transmitting terminal; and the decoding terminal uses the LLSE to denoise, and uses ZF-DFE to decode, and inverse discrete cosine transformation (IDCT) is performed finally, so as to acquire the recovered video.

Description

technical field [0001] The invention belongs to the technical field of video codec and wireless transmission, and in particular relates to a video soft broadcasting method based on channel characteristics, which provides stronger protection for video data at the physical layer, thereby finally improving the quality of video recovery. Background technique [0002] With the rapid development of wireless networks and mobile terminals, wireless video multicast is becoming more and more common. Therefore, how to provide better video services in wireless networks has become a research hotspot in the field of wireless video multicast. The purpose of wireless video multicast is to transmit a video signal to multiple users at the same time by a video server. The main challenge is the heterogeneous characteristics of users and the smooth degradation of video quality. The traditional wireless video transmission framework consists of digital compression coding and digital channel coding...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L1/08H04L27/26
CPCH04L1/08H04L27/2601H04L67/1078H04L65/70
Inventor 王安红张帆李素月王海东马晓莉
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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