Orthogonal space-time block coding method and device in m-ppm optical communication system
A space-time block coding and optical communication system technology, applied in the field of optical communication, can solve the problems of inability to meet transmission requirements and low transmission efficiency, and achieve the effect of breaking through application limitations, large channel capacity, and improving effectiveness and reliability
Active Publication Date: 2018-01-16
GUILIN UNIV OF ELECTRONIC TECH
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Orthogonal space-time block coding (OSTBC) is a simple and effective space-time orthogonal coding method in MIMO technology, but the existing OSTBC design in optical communication systems based on intensity modulation / direct detection (IM / DD) only supports OOK Two modulation methods, B-PPM and B-PPM, the transmission efficiency of these two modulation methods is too low, and the transmission requirements cannot be met when the background light is relatively strong or high-speed communication
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[0025] In order to better understand the present invention, the present invention will be further described in detail below in conjunction with the given embodiments and drawings.
[0026] 1. Aiming at the M-PPM optical communication system of any order, an OSTBC coding transmission scheme that can make the optical communication system obtain the orthogonal diversity gain in space and time at the same time is designed. The features of the coded transmission scheme include:
[0027] (1) Two light sources are used to emit light signals.
[0028] (2) The form of the emission matrix C is as follows:
[0029] or or or
[0030] Where c 1 With c 2 Is the modulation symbol; c i T Is the modulation symbol c i (i=1, 2) The inverse sign on the same prime number group.
[0031] 2. The characteristics of the above modulation symbol and its inverse symbol are:
[0032] (1) The modulation symbol and its inverse symbol belong to the same prime number group G={1,2,3,,p-1}, where p is a prime number, ...
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The invention discloses orthogonal space-time packet coding and decoding methods and devices in an M-PPM optical communication system. The coding method includes the following steps: using two light sources to emit light signals; and transmitting a matrix C or the decoding method includes signal orthogonal combination and maximum likelihood decoding. The maximum likelihood decoding process includes the following steps: (1) applying a maximum likelihood criterion and according to a signal combination result, looking for a modulation sign and inverse sign pair with the maximum energy; (2) applying a time orthogonal characteristic of M-PPM signals and determining the modulation sign from the modulation sign and inverse sign pair with the maximum energy so as to obtain a decoding result. The orthogonal space-time packet coding and decoding methods and devices in the M-PPM optical communication system enable a wireless optical communication system to have a larger channel capacity and are capable of effectively weakening effects of atmospheric turbulences on system performance so that system validity and reliability are further improved and the methods and devices are applicable to an M-PPM optical communication system of any modulation order and capable of breaking through application limitations of a traditional OSTBC scheme.
Description
Technical field [0001] The present invention relates to the field of optical communication technology, in particular to an orthogonal space-time group coding and decoding method and device based on an M-PPM optical communication system. Background technique [0002] Applying multiple-input multiple-output (MIMO) technology to optical communication systems enables the optical communication system to have a larger channel capacity, and can effectively reduce the impact of atmospheric turbulence on optical communication, and improve the effectiveness and reliability of communication. Orthogonal space-time block coding (OSTBC) is a simple and effective space-time orthogonal coding method in MIMO technology, but the existing OSTBC design based on intensity modulation / direct detection (IM / DD) optical communication system only supports OOK And B-PPM two modulation methods, the transmission efficiency of these two modulation methods is too low, and can not meet the transmission requireme...
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IPC IPC(8): H04L1/06H04B10/11
Inventor 敖珺马春波敖发良
Owner GUILIN UNIV OF ELECTRONIC TECH