Polarization code building method capable of resisting atmospheric turbulence decline based on Gaussian approximation theory

A technology of atmospheric turbulence and construction methods, which is applied to electrical components, using linear codes for error correction/detection, and using block codes for error correction/detection, etc., which can solve the problem of limited decoding performance of polar codes and the inability to accurately select Polarized sub-channels to transmit information bits and other issues to achieve the effect of reducing complexity

Inactive Publication Date: 2018-07-06
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0007] When polar codes are used in free-space optical communication systems, since the atmospheric turbulence effect will produce random fluctuations in the strength of the received signal, the traditional polar code construction scheme for additive Gaussian white noi

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  • Polarization code building method capable of resisting atmospheric turbulence decline based on Gaussian approximation theory
  • Polarization code building method capable of resisting atmospheric turbulence decline based on Gaussian approximation theory
  • Polarization code building method capable of resisting atmospheric turbulence decline based on Gaussian approximation theory

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Embodiment

[0034] This embodiment provides a polar code construction method based on Gaussian approximation to resist atmospheric turbulence attenuation, which is used to select the most reliable polar sub-channel transmission information bit sequence in the atmospheric turbulence channel, and the other sub-channels transmit the sending end and A fixed sequence of bits known to both receivers.

[0035] The polar code construction method includes the following steps:

[0036] (1) According to the signal instantaneous gain I caused by the known atmospheric turbulence effect q and the Gaussian noise power σ at the receiver 2 , to determine the probability density distribution of the Log-Likelihood Ratio (LLR) of the received signal when the transmitted signal is an all-zero sequence. Since the probability density distribution of the log likelihood ratio of the received signal conforms to the Gaussian distribution, the probability density distribution can be uniquely determined by the mean...

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Abstract

The invention provides a polarization code building method capable of resisting atmospheric turbulence decline based on a Gaussian approximation theory. Polarization code coding is applied to a free space optical communication system, a polarization sub-channel with relatively low atmospheric turbulence gain error probability is selected to be applied to transmitting an information bit sequence, and a polarization sub-channel with relatively high atmospheric turbulence gain error probability is selected to be applied to transmitting a known fixed bit sequence. The method provided by the invention comprises the specific steps of initializing a probability density distribution of a received signal log-likelihood ratio according to a signal transient gain caused by atmospheric turbulence; performing iteration computing on log-likelihood ratio probability density distribution of the polarization channels; computing the error probability of each polarization sub-channel; and selecting the polarization sub-channel with the relatively low error probability to be applied to transmitting the information bit sequence. According to the method provided by the invention, the problem of buildingthe polarization code under the atmospheric turbulence decline channel is mainly solved, decrease of the system performance caused by atmospheric turbulence decline can be effectively suppressed, andthe stability of the free space optimal communication system is improved.

Description

technical field [0001] The invention relates to the field of information coding and free space optical communication, in particular to a construction method of polar codes against atmospheric turbulence attenuation. Background technique [0002] With the continuous increase of communication capacity, the spectrum resource of traditional radio frequency communication is gradually becoming saturated, and the Free Space Optical communication system (Free Space Optical, FSO) communication system has been widely concerned. Compared with the traditional radio frequency communication system, the free space optical communication system has the advantages of high transmission rate, large transmission bandwidth, no electromagnetic interference, and no frequency license. Therefore, the free space optical communication system is being widely used in the last mile access, campus and enterprise interconnection, video surveillance stream transmission, wireless backhaul, disaster recovery e...

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Application Information

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IPC IPC(8): H04L1/00H04B10/11H03M13/13H04B10/516
CPCH03M13/13H04B10/11H04B10/516H04L1/0057
Inventor 方佳飞肖石林毕美华刘凌张云昊黄天成
Owner SHANGHAI JIAO TONG UNIV
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