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Adaptive layered video transmission method based on channel characteristics

A technology of channel characteristics and video transmission, applied in the field of video transmission, can solve the problem of not considering channel characteristics and so on

Active Publication Date: 2017-11-10
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of according to the actual transmission channel characteristic, provide different protections to the video data with different importance in the physical layer, to effectively overcome the shortcoming that the existing video transmission technology does not consider the channel characteristic, thereby improve the video quality finally. Adaptive Layered Video Transmission Method Based on Channel Characteristics for Recovering Quality

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  • Adaptive layered video transmission method based on channel characteristics
  • Adaptive layered video transmission method based on channel characteristics
  • Adaptive layered video transmission method based on channel characteristics

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specific Embodiment approach

[0074] The specific operation steps are:

[0075] Ⅰ. The sending end mainly includes layered SVC video coding, OFDM technology, subcarrier allocation, water injection algorithm, etc., including the following steps:

[0076] The first step: read in the video sequence;

[0077] The second step: use the SVC encoder to encode the video sequence to generate a base layer (Base Layer, BL) and an enhancement layer (Enhancement Layer, EL);

[0078]Step 3: Modulate the BL and EL bit streams generated by encoding using 16 Quadrature Amplitude Modulation (16QAM), and the modulation principle is to convert the adjacent four binary bits 0000, 0001, 0010, 0011, 0100 , 0101, 0110, 0111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111 are modulated into corresponding symbols -3-3j, -3-j, -3+3j, -3+j, -1- 3j, -1-j, -1+3j, -1+j, 3-3j, 3-j, 3+3j, 3+j, 1-3j, 1-j, 1+3j, 1+j;

[0079] Step 4: According to the channel state information transmitted by the feedback channel, including the channel tran...

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Abstract

The invention discloses a self-adaptive layered video transmission method based on channel characteristics. The method can provide different kinds of protection for video data with different levels of importance in a physical layer so as to improve the video restoration quality finally. According to the technical scheme, the method comprises the steps that a video sequence is read in by a sending end, videos are encoded by an SVC encoder, a BL bit stream and an EL bit stream which are generated during encoding are modulated through 16QAM, subcarrier distribution and power distribution are carried out according to CSI transmitted by a feedback channel, serial-parallel conversion is carried out on a BL symbol and an EL symbol, parallel signals are mixed and undergo IFFT, a cyclic prefix is inserted, parallel-serial conversion is carried out, and an OFDM transmission symbol is sent to a channel; the process of the receiving end is opposite to the process of the sending end, the obtained bit streams are input into an SVC decoder to be decoded to obtain BL data and EL data, a receiver with weaker receiving capacity receives the BL data and restores the low-resolution videos, and a receiver with stronger receiving capacity receives the two layers of data and restores the high-resolution videos.

Description

technical field [0001] The invention belongs to the technical field of video transmission methods, and in particular relates to an adaptive layered video transmission method based on channel characteristics that provides different protections for video data with different importances at the physical layer, thereby ultimately improving video recovery quality. Background technique [0002] With the rapid development of wireless networks and mobile terminals, wireless video transmission technology has become 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 transmission. At present, wireless multicast is an important way of wireless video transmission. Its purpose is to transmit a video signal to multiple users at the same time by the video server, and each user can get his own restored video. Since multiple users have heterogeneous channel conditions (for example, the base sta...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L5/00H04N19/37
Inventor 王安红张帆马晓莉王海东邢彩荣
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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