Synchronization method applied to photon counting visible light communication system
A visible light communication and photon counting technology, which is applied in the field of visible light communication, can solve the problems that there is no mature technology and equipment for photon counting visible light communication, and there is no pulse signal synchronization.
Active Publication Date: 2018-07-13
DONGGUAN XINDA INST OF INTEGRATED INNOVATION +1
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[0004] Since the research on SPAD-based photon counting visible light communication is still in its infancy, there is no mature technology and equipment for actual photon counting visible light communication.
The theoretical research on the counting judgment of this system is mostly based on the premise of complete synchronization, and there is no specific scheme for synchronizing the output pulse signal.
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[0038] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention.
[0039] Such as figure 1 As shown, when the receiving end receives the data from the sending end, it compiles the data into several data frames composed of synchronous code groups, such as figure 2 As shown, at the beginning of each frame, a synchronization header for marking the starting position of the data frame is added; wherein, the synchronization header is composed of M-bit synchronization code groups, and the i-th synchronization code group is recorded as s i , the number of data bits in the frame is D.
[0040] In order to determine the arrival position of the counting pulse, the SPAD output signal is first sampled, thereby converting the continuous signal in the time doma...
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The invention relates to the technical field of visible light communication, and specifically discloses a synchronization method applied to a photon counting visible light communication system. The method comprises the following steps: encoding data into a plurality of data frames composed of synchronization code groups at a receiving end; performing digital signals on an SPAD output signal, and determining an arrival position of a counting pulse; sending a pulse position signal to a shift register, and dividing the shift register into a plurality of time windows; performing cross-correlationcalculation between the pulse counts in each time window and the synchronization code group, and comparing the similarity between the two; judging whether synchronization is reached by the similaritybetween the pulse count and the synchronization code group; and if the synchronization is reached, judging each code element, and restoring the sent data. According to the synchronization method, thebit synchronization and frame synchronization are combined, photon pulse counting of bit synchronization and frame synchronization is performed, and the cross-correlation calculation is performed by using the photon pulse counting and the frame synchronization code group, thereby realizing the synchronization of SPAD-based photon counting visible light communication system.
Description
technical field [0001] The invention relates to the technical field of visible light communication, and specifically discloses a synchronization method applied to a photon counting visible light communication system. Background technique [0002] The current visible light communication (VLC) system usually uses the method of intensity modulation / direct detection, using high-speed LED to send signals in the form of light intensity at the sending end, and using PD to detect light intensity at the receiving end to complete photoelectric conversion. When VLC is used for long-distance communication, such as monitoring systems of gas pipelines and data transmission through plastic optical fibers, the number of photons reaching the receiver is much smaller than that of short-distance communication links, and the signal is submerged in noise; or underwater In visible light communication, due to the absorption and scattering of light by the water body, the signal is weak when the lig...
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IPC IPC(8): H04B10/116H04L7/00
CPCH04B10/116H04L7/0075
Inventor 汪涛冀亚玮朱义君田忠骏郑晓东刘洛琨梁进山张海勇
Owner DONGGUAN XINDA INST OF INTEGRATED INNOVATION