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Transmission method and device for physical layer data in satellite two-way communication

A data transmission method and two-way communication technology, which is applied in the field of physical layer data transmission in satellite two-way communication, can solve the problems of high error rate, limited application range, high decoding complexity, etc., and achieve the effect of reducing complexity

Inactive Publication Date: 2012-03-21
ACAD OF BROADCASTING SCI SARFT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the existing physical layer data transmission scheme adopts Turbo encoding, and the frame control data adopts a separate Turbo encoder, which causes problems such as high decoding complexity and high error flat bottom, which makes the cost of satellite two-way communication terminal equipment relatively high. High, the scope of application is limited

Method used

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  • Transmission method and device for physical layer data in satellite two-way communication
  • Transmission method and device for physical layer data in satellite two-way communication
  • Transmission method and device for physical layer data in satellite two-way communication

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Embodiment 1

[0068] Such as image 3 As shown, a satellite two-way communication physical layer data transmission method provided by the embodiment of the present invention, of course, the method provided by this embodiment is only a specific implementation, not the only implementation of the method of the present invention; specific , the method includes:

[0069] Step 1, combine the 16-byte MAC frame control data and the 108-byte payload data in the MAC frame stream data to form the first PBB (Physical Block Body, physical block body) in the physical layer data frame, and add 4 bytes PBH (Physical Block Header, physical block header), and then perform CRC32 encoding to form the first forward error correction code FEC in the physical layer frame, that is, the LDPC codeword;

[0070] In this embodiment, the size of the PBB is limited to 124 bytes;

[0071] Step 2. According to the specific application requirements, determine whether to combine to form other PBBs. If so, form one or more ...

Embodiment 2

[0093] Such as Figure 6 As shown, the data receiving and processing flow of a satellite two-way communication physical layer data transmission provided by Embodiment 2 of the present invention, the specific implementation steps are as follows:

[0094] Step 1, performing down-conversion and orthogonal demodulation processing on the data from the satellite communication channel link;

[0095] Step 2, performing matched filtering and channel equalization on the demodulated data;

[0096] Among them, the matched filter also uses a raised cosine roll-off filter with a roll-off coefficient of 0.35, and the equalization algorithm adopts the maximum likelihood equalization algorithm, that is, the Viterbi equalization algorithm;

[0097] Step 3. The data after equalization is completed, and the synchronization head UW in the data is used to perform synchronous processing on the data; wherein, the synchronous processing process adopts a general correlation operation to obtain a correla...

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Abstract

The invention discloses a transmission method and a device for physical layer data in satellite two-way communication. The transmission method includes that media access control (MAC) frames to be transmitted form one or a plurality of physical block bodies through a data sending end according to predefined configurations, and one or a plurality of low density parity check (LDPC) code words are obtained after physical block heads and cyclic redundancy check (CRC) codes are added on each obtained physical block body. The physical block bodies at least comprise control data of the MAC frames, and the control data respectively performs scrambling, LDPC encoding and bit interweaving processing on the LDPC code words and adds advanced audio codes (ACCs) in front of the processed LDPC code words to obtain physical layer data frames. The obtained physical layer data frames are conducted with mapping processing and sent to the downstream after synchronous heads UW are added in frame heads. The transmission method and the device for physical layer data in satellite two-way communication solves the problems of high complexity and error floor in coding and the like caused by the fact that the existing frame control data adopts an independent Turbo coder in the prior art.

Description

technical field [0001] The invention relates to the technical field of satellite broadcast communication, in particular to a physical layer data transmission method and device in satellite two-way communication. Background technique [0002] At present, in areas with large areas and sparsely populated areas, mainly in mountainous areas and hills, where wired communication is difficult to achieve and wireless communication coverage is difficult, it is necessary to develop satellite two-way communication services to achieve contact with the outside world, especially in electric power, chemical industry, water conservancy, radio and television and geology Fields such as exploration have their own unique needs for two-way communication and data transfer via satellite. In addition, in densely populated areas such as cities and towns where satellite TV is broadcast, there is also a demand for satellite two-way services, including VoIP, distance learning, video-on-demand and other ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B7/185
Inventor 刘春江裴育杰施玉海郭沛宇杨明吴力夫冯海亮傅雪鹏周德斌李晓鸣苗勃
Owner ACAD OF BROADCASTING SCI SARFT
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