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Sequence detection method based on generalized likelihood ratio detection principle in wireless optical communication

A generalized likelihood ratio and wireless optical communication technology, which is applied in the field of sequence detection based on the generalized likelihood ratio detection principle, can solve the problems of system complexity increase, reduce system complexity, avoid judgment failure and error leveling problems , Avoid the effect of error leveling problem

Active Publication Date: 2017-08-04
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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  • Sequence detection method based on generalized likelihood ratio detection principle in wireless optical communication
  • Sequence detection method based on generalized likelihood ratio detection principle in wireless optical communication
  • Sequence detection method based on generalized likelihood ratio detection principle in wireless optical communication

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Embodiment approach

[0033] Since the decision complexity of the generalized likelihood ratio detection principle 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 path in the observation window, the path is measured by the generalized likelihood ratio

[0036]

[0037] or

[0038]

[0039] And judgment conditions

[0040]

[0041] Choose one of the M hypothetical paths converging to each node as the surviving path;

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

[0043] (4) Store the surviving path and reception sequence at the undetected time (that is, after time t). Select and store L in the test sequence in chronological order i M-order ...

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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 suitable for the field of wireless optical communication, and specifically relates to a sequence detection method based on the principle of generalized likelihood ratio detection. 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 the sequence detection results. This method is also applicable to communication fields where other channels contain additive constant or slowly changing 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 transmitting power, no electromagnetic interference, and green energy saving. Wireless optical communication systems generally use wireless channels as transmission me...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L1/00
CPCH04L1/0036H04L1/0046H04L25/0202
Inventor 宋天宇吴茗蔚丰明坤余作奔王中鹏周武杰翟治年
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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