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Transmission method and system based on HARQ anti-fading in space optical communication

A space optical communication and transmission method technology, which is applied in the field of space optical communication anti-fading, can solve the problems of increased time delay, poor error correction efficiency, waste of channel resources, etc., and achieves reduced bit error rate, large throughput, and improved The effect of anti-fading performance

Active Publication Date: 2020-05-15
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, because the HARQ scheme does not retransmit and correct some frames in a series of burst errors caused by atmospheric turbulence, but retransmits the entire error correction frame, the error correction efficiency of the entire HARQ system deteriorates, and the time delay increase, and the retransmission of part of the correct frame in the error correction frame will cause a great waste of channel resources

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  • Transmission method and system based on HARQ anti-fading in space optical communication
  • Transmission method and system based on HARQ anti-fading in space optical communication
  • Transmission method and system based on HARQ anti-fading in space optical communication

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Embodiment Construction

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts all belong to the protection scope of the present invention.

[0043] In order to further improve the anti-fading performance of the retransmission scheme combined with LDPC error correction code and ARQ, this embodiment proposes an improved HARQ scheme on the basis of the traditional chase type HARQ scheme, including the following steps:

[0044] S1. Perform frame grouping on the data sent by the buffer at the sending end, perform PPM modulation after the grouping is completed, and transmit through the fa...

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Abstract

The invention belongs to the technical field of space optical communication anti-fading, and particularly relates to a transmission method and system based on HARQ anti-fading in space optical communication. The method comprises the steps of carrying out the frame grouping of data transmitted by a transmitting end buffer, carrying out the PPM modulation after the grouping is completed, and carrying out the transmission through a fading channel; enabling a photon detector to estimate and judge the optical power of each frame of signal; if the actual photon number is greater than the threshold value of the photon detector, carrying out error correction in combination with an error correction code and an interleaving mode, and sending ACK confirmation data to a sending end buffer; and otherwise, sending a NACK non-acknowledgement signal to the sending end buffer, and retransmitting the retransmission frame of which the photon number is lower than the threshold value and is prone to error. Compared with a traditional HARQ scheme and a long interleaving combined LDPC error correction code scheme, the method has the advantages that the bit error rate of the system is reduced; the throughput is larger; and the anti-fading performance of the system is improved.

Description

technical field [0001] The invention belongs to the field of space optical communication anti-fading technology, in particular to a transmission method and system based on HARQ anti-fading in space optical communication. Background technique [0002] The existing anti-fading key technologies are divided into three categories: one is forward error correction code (FEC), such as low-density parity-check code (LDPC), Turbo code, RS convolutional code, fountain code; the other is Yes Automatic Repeat Request (ARQ); also includes Hybrid Automatic Repeat Request (HARQ). [0003] Forward error correction code (FEC): Directly correct the error codewords in the transmission process through error correction codes, but FEC is only suitable for error correction of short error codes, and has insufficient error correction capability for bursts of error codewords caused by atmospheric turbulence . Therefore, the interleaving method is generally used to disperse a series of error codeword...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04L1/00
CPCH04L1/1812H04L1/0078
Inventor 卢小辉向劲松钟路张卓
Owner CHONGQING UNIV OF POSTS & TELECOMM
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