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A Sequence Detection Method Based on Generalized Likelihood Ratio Detection Principle for Wireless Optical Communication

A generalized likelihood ratio, wireless optical communication technology, applied in the field of sequence detection based on the generalized likelihood ratio detection principle, can solve problems such as system complexity growth, reduce system complexity, reduce system complexity and storage capacity, The effect of avoiding decision failure and error leveling problems

Active Publication Date: 2020-02-28
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

The performance of signal block-by-block sequence detection is better than symbol-by-symbol detection, and the performance increases with the sequence length, but the system complexity also increases exponentially with the sequence length

Method used

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  • A Sequence Detection Method Based on Generalized Likelihood Ratio Detection Principle for Wireless Optical Communication
  • A Sequence Detection Method Based on Generalized Likelihood Ratio Detection Principle for Wireless Optical Communication
  • A Sequence Detection Method Based on Generalized Likelihood Ratio Detection Principle for Wireless Optical Communication

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Embodiment approach

[0033] Due to the generalized likelihood ratio detection principle, the decision complexity is M L-1 , the present invention designs a fully connected grid graph search method to reduce system complexity. The implementation is as follows:

[0034] (1) Construct a fully connected grid graph with M nodes at each moment, such as figure 1 ;

[0035] (2) For each node at time k, based on the signal and surviving paths in the observation window, the generalized likelihood ratio path metric

[0036]

[0037] or

[0038]

[0039] and judgment conditions

[0040]

[0041] Select one of the M hypothetical paths that converge to each node as a surviving path;

[0042] (3) When M surviving paths converge at time t (t

[0043](4) Store the surviving paths and receiving sequences at the undetected time (ie after time t). Select and store L in the detection sequence in chronological order i an M-order modul...

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Abstract

The invention discloses a sequence detection method based on a generalized likelihood ratio detection principle in wireless optical communication. In view of a multi-order modulation system, sequence detection is carried out on signals through a full-connection grid graph search method and a selective storage method on the basis of generalized likelihood ratio path measurement of an observation window and a decision condition, and channel estimation and ambient light estimation can also be carried out based on sequence detection values. The grid graph designed by the invention is a full-connection graph, and the memory span of the channel does not required to be mastered. The complexity of the grid graph search algorithm is close to the square of a modulation order and does not increase with the sequence length, the observation window length or the memory span of the channel. The complexity and the storage capacity of the system are further reduced by the selective storage method, and the problems of decision failure and error leveling layers are avoided.

Description

technical field [0001] The invention is applicable to the field of wireless optical communication, and in particular relates to a sequence detection method based on a generalized likelihood ratio detection principle. In the absence of channel estimation and ambient light estimation, the sequence detection method can automatically eliminate the influence of ambient light, and can perform channel estimation and ambient light estimation based on sequence detection results. This method is also applicable to other communication domains where the channel contains additive constant or slowly varying interference in addition to multiplicative channel coefficients. Background technique [0002] Compared with traditional radio frequency and infrared communication, wireless optical communication has the advantages of high transmission power, no electromagnetic interference, and green energy saving. Wireless optical communication systems generally use wireless channels as the transmiss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L1/00
CPCH04L1/0036H04L1/0046H04L25/0202
Inventor 吴茗蔚宋天宇余作奔周武杰王中鹏翟治年刘喜昂郑卫红叶林朋
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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