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Free Space Optical Communication System and Method Based on Compressed Sensing and Sparse Aperture

An optical communication system and sparse aperture technology, which is applied in the field of free-space optical communication systems based on compressed sensing and sparse aperture, can solve the problems of sampling redundancy and limited aperture size, and achieve cost savings, save detection dimensions, and overcome sampling problems. The effect of redundancy

Active Publication Date: 2015-09-09
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0010] The purpose of the present invention is to overcome the defects of sampling redundancy and limited aperture size in the free space optical communication system in the prior art, thereby providing a free space optical communication system based on compressed sensing and sparse aperture

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  • Free Space Optical Communication System and Method Based on Compressed Sensing and Sparse Aperture

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Embodiment Construction

[0043] The present invention will be further described now in conjunction with accompanying drawing.

[0044] The free-space optical communication system based on compressed sensing of the present invention adopts the principle of compressed sensing (Compressive Sensing, referred to as CS), which can be randomly sampled with fewer data samples (far lower than Nyquist / Shannon sampling). The limit of the theorem) perfectly recovers the original signal. The basic process of compressed sensing includes: firstly, using prior knowledge, select a suitable sparse basis Ψ, so that the point spread function x is converted by Ψ to get x' is the most sparse; and sparse basis Ψ, establish a mathematical model y=AΨx′+e, perform convex optimization through the compressed sensing algorithm, obtain x’, and then use Inverts to x.

[0045] Imaging systems are generally divided into coherent light imaging systems and incoherent light imaging systems. In the incoherent light diffraction-limited...

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Abstract

The invention relates to a free space light communication system based on compressed sensing and sparse aperture. The free space light communication system comprises a sparse aperture unit, a free space collimating unit, a light beam converting unit, a beam spot synthesizing lens, a space light modulator mapping lens, a seventh reflector, a space light modulator module, a light converging and collecting unit, a point detector, an adder and a computing module, wherein light signals incident on each light path are projected onto the beam spot synthesizing lens, the sparse aperture is directly imaged and mapped to the space light modulator module through the space light modulator mapping lens and the seventh reflector, a sparse aperture imaging light field is randomly modulated by the space light modulator module, the randomly modulated light is collected and gathered, and the collected light signals are converted into effective electric signals; the adder computes each path of electric signals, and results are input into the computing module; and after the processes are repeated for many times, the computing module utilizes compressed sensing theory to rebuild a point spread function subjected to disturbance degradation, and the point-to-point free space light communication is realized.

Description

technical field [0001] The invention relates to the field of free space optical communication, in particular to a free space optical communication system and method based on compressed sensing and sparse aperture. Background technique [0002] Free space optical communication uses the atmosphere as the transmission medium to transmit optical signals. It combines the advantages of optical fiber communication and microwave communication. It not only has the advantages of large communication capacity and high-speed transmission, but also does not need to lay optical fibers. Compared with laser communication, The laser used in free-space optical communication has high frequency, strong directivity, and wide available frequency spectrum, and there is no need to apply for a frequency use license. Compared with optical fiber communication, free-space optical communication has a lower cost and is easier and faster to construct. The United States is the first country in the world to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/11
Inventor 孙志斌
Owner NAT SPACE SCI CENT CAS
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