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Network-code-based free-space optical cooperative relay communication method

A technology of network coding and cooperative relay, applied in baseband system components, preventing/detecting errors through diversity reception, digital transmission systems, etc., can solve problems such as lack of applications, and achieve the effect of improving throughput and reducing time overhead

Inactive Publication Date: 2011-05-25
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The current relay transmission technology of free space optical communication is still lack of application in the scenario of multiple source nodes

Method used

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  • Network-code-based free-space optical cooperative relay communication method
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  • Network-code-based free-space optical cooperative relay communication method

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Experimental program
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Embodiment Construction

[0071] For the free space optical transmission method based on network coding cooperative relay proposed by the present invention, its specific implementation steps are as follows:

[0072] 1. Generate randomly distributed information bit data;

[0073] 2. Generate a set of pseudo-random interleaving patterns and distribute them to the interleavers of each transmitting node. At the same time, the relay node and the target receiving node also store this set of interleaving patterns;

[0074] 3. The free space optical communication system works in two time slots:

[0075] (1) First time slot transmission processing

[0076] In the first time slot, the media access layer of each source node sets a certain transmit optical power for the information bit data to be transmitted, and transmits the data to the physical layer transmit module; in the physical layer transmit module, the data First perform channel coding (such as: repetition code coding), then perform interleaving accor...

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Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a network-code-based free-space optical cooperative relay communication method. In the invention, a relay node of the system is provided with a baseband signal processing module which can perform the network coding for relay data; in addition, a destination node utilizes a double iterative receiver structure and a network-code-based iterative detection algorithm to detect the information of a multi-source node. The method can provide a space diversity gain to a destination node receiver. The transmission reliability which is higher than that of the traditional multi-source system can be realized; and at the same time, the expenditure of relay equipment can be reduced, and the system capacity can be improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a free space wireless optical cooperative relay communication method based on network coding. Background technique [0002] Free-space optical communication technology (FSO, Free-Space Optics), also known as wireless optical communication, is a wireless communication technology that uses the atmosphere as the transmission medium and laser as the carrier to transmit high-speed information. It is a combination of optical communication and wireless communication, which has many advantages such as high data transmission rate, does not occupy licensed frequency band, and low equipment cost. As a promising solution to the "last mile" problem, free-space optical communication technology has gained widespread attention. However, for free-space optical communication systems, atmospheric attenuation and atmospheric turbulence will seriously reduce transmission r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04L25/02
Inventor 周小林杨彦东张成磊刘俊
Owner FUDAN UNIV
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