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A system and method for free-space optical communication based on compressed sensing

An optical communication system and free space technology, applied in the direction of free space transmission, can solve the problems of high cost and signal redundancy, and achieve the effects of saving cost, saving detection dimensions, and avoiding background noise and electrical noise

Active Publication Date: 2016-08-24
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the free space optical communication system in the prior art, such as high cost and a large number of signal redundancy, so as to provide a system with less sampling, high imaging quality, low cost, high signal-to-noise ratio, and bit error rate. Low-cost, simple and reliable free-space optical communication system and method

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  • A system and method for free-space optical communication based on compressed sensing
  • A system and method for free-space optical communication based on compressed sensing
  • A system and method for free-space optical communication based on compressed sensing

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[0044] The present invention will be further described now in conjunction with accompanying drawing.

[0045] Before explaining the system and method of the present invention in detail, the relevant concepts in the present invention will be described first.

[0046] Compressive Sensing (CS for short): Compressed Sensing is a new mathematical theory proposed by Donoho, Tao and Candès et al. The prior knowledge of the representation can achieve subsampling far below the Nyquist / Shannon sampling limit, and can reconstruct signal information almost perfectly with higher robustness. The implementation steps of the compressed sensing include: firstly, using the prior knowledge, selecting a suitable sparse basis Ψ, so that the point spread function x is converted by Ψ to obtain x' which is the most sparse; Under the condition of matrix A and sparse basis Ψ, a mathematical model y=AΨx′+e is established; after convex optimization is carried out through compressed sensing algorithm, x’...

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Abstract

The invention relates to a free space light communication system and method based on compressed sensing. The free space light communication system comprises an imaging lens, a space light modulator module, a focusing light-collecting unit, a point detector, a summator and an algorithm module. Free space light is transmitted onto the space light modulator module through the atmosphere to form space light intensity distribution, and then a binary random measuring matrix is loaded on the space light modulator module in order to realize random light intensity modulation. The modulated free space light is divided into multiple routes, and each route of free space light is focused by the focusing light-collecting unit, collected by the point detector and converted into electric signals. The summator calculates the obtained electric signals of all the routes, and inputs a calculation result to the algorithm module, the algorithm module reestablishes the point spread function which degenerates due to disturbance according to the compressed sensing theory, and therefore 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 system and method for free-space optical communication based on compressed sensing. Background technique [0002] Free space optical communication refers to the realization of point-to-point communication by modulating the light intensity of the optical carrier to spread information in the atmosphere. Free space light is the preferred solution for long-distance radio frequency. Due to the good parallelism of the beam, it has great advantages in communication. In order to detect the instantaneous light field signal, the receiver only needs to place a photoelectric sensor at the focal plane of the collecting lens. That is, the photoelectric sensor can convert the light intensity signal into an electrical signal proportionally. The light intensity distribution of the light field at the focal plane can be expressed by a point spread function. Ideally, it is assumed ...

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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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