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Method of performing full linear error-free protection transmission on multimedia data

A multimedia data and full-line technology, applied in digital transmission systems, transmission systems, error prevention, etc., can solve problems such as image quality degradation, high hardware costs, and cliff effects

Active Publication Date: 2015-10-21
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) Softcast has a digital side channel. When the channel quality is poor to a certain extent, there will be a cliff effect, and the image quality will suddenly drop.
[0008] (2) There are digital side channels and analog main channels in the channel, and the hardware cost is high

Method used

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  • Method of performing full linear error-free protection transmission on multimedia data
  • Method of performing full linear error-free protection transmission on multimedia data
  • Method of performing full linear error-free protection transmission on multimedia data

Examples

Experimental program
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Embodiment 1

[0076] A schematic diagram of the processing flow of the encoding and transmitting part and the receiving and decoding part in the method for performing full-linear non-error-correction-protected transmission of picture multimedia data in the embodiment of the present invention is as follows figure 1 As shown, among them, figure 1 The encoded transmission part shown in A includes the following processing steps:

[0077] Step 1, separate each frame of the image multimedia data to be transmitted independently to obtain M frames, and take a 2 in one frame N ×2 N module, the M and N are set integers. The above multimedia data may be video data or picture data.

[0078] Step 2, will 2 N ×2 N After subtracting 128 from each pixel in the module, a decorrelation transformation is performed to obtain a decorrelation transformation coefficient matrix.

[0079] Step 3, will 2 N ×2 N The decorrelation transformation coefficient matrix of the module is obtained by data rearrangemen...

Embodiment 2

[0123] FPGA+DSP implementation method: Due to the need for real-time video encoding and decoding (especially the receiving and decoding part), the FPGA+DSP implementation method becomes very necessary. The implementation of this scheme is divided into two parts: encoding, transmitting and receiving and decoding, which are respectively implemented on two Xilinx KC705FPGA development boards.

[0124] In this implementation scheme, the module size is 8×8 (that is, N=3), and M=256 at the same time. The communication system is realized by OFDM system, the de-correlation transformation is DCT transformation, the data rearrangement uses zigzage algorithm, and the whitening transformation adopts Wash-Hadamard transformation. The specific implementation plan is as follows:

[0125] 1.1) The schematic diagram of the hardware system structure of the encoding and transmitting part of the embodiment of the present invention is as follows: Figure 5 As shown, the hardware part of the enco...

Embodiment 3

[0152] 2): Implementation of software radio:

[0153] In this implementation scheme, the module size is 8×8 (that is, N=3), and M=256 at the same time. The communication system is realized by OFDM system, the de-correlation transformation is DCT transformation, the data rearrangement uses zigzage algorithm, and the whitening transformation adopts Wash-Hadamard transformation. The specific implementation plan is as follows:

[0154] Source channel coding and decoding is completed by software on the PC, and high-speed digital signal processing and RF transmission and reception are completed on the USRP N210 motherboard. The software radio architecture structure diagram of the embodiment of the present invention is as follows Figure 9 As shown, the hardware part: it is composed of PC, software radio development board, and RF radio frequency chip.

[0155] 2.1) PC: through Matlab software architecture AnalogCast source codec end, linear OFDM channel codec end.

[0156] 2.3) S...

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Abstract

The invention discloses a method of performing full linear error correction-free protection transmission on multimedia data, comprising performing decorrelation transformation, energy distribution and whitening transformation on multimedia data at a sending terminal to obtain metadata matrixes and metadata vectors; setting training data corresponding with the multimedia data, and performing decorrelation transformation, energy distribution and whitening transformation on the training data to obtain training vectors; and merging the metadata matrixes, metadata vectors and training vectors and then transmitting the merged data through an error correction-free protection linear modulation radio communication channel. According to the invention, the impartiality as excellent as a Softcast system can be obtained, and metadata transmission does not exist the cliff effect, and has better robustness and transmission distance; digital sideway information does not exist, and calculating complexity and cost are reduced; metadata transmission occupies less bandwidth; when bandwidth is adequate, an IQ merging simulation modulation mode is employed, which can improve an anti-noise performance, and meanwhile increase the resistivity to phase noise.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of multimedia data transmission, and in particular, to a method for performing full linear transmission without error correction protection on multimedia data. Background technique [0002] Wireless multicast is a video broadcast service applied to different channel situations. The existing wireless multicast system has a short-board effect, that is, the video or picture quality received by all receivers is the same as that received by the receiver with the worst channel. This short board effect makes the existing wireless multicast system unable to be "fair" to all receivers. At the same time, because the existing multicast system adopts a redundant picture compression method to be transmitted, the traditional wireless multicast system cannot tolerate the occurrence of packet loss during wireless transmission, which makes the traditional wireless multicast system suffer from chann...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L27/36H04L1/06
CPCH04L1/0668H04L27/364H04L65/60
Inventor 文湘鄂李憬宇贾惠柱解晓东
Owner PEKING UNIV
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