Data recovery and open-loop synchronization method for optical PPM asynchronous sampling signal based on MPPC detection

A technology of sampling signal and open-loop synchronization, applied in the field of space optical communication, which can solve the problems of poor robustness of ratio method, inaccurate photon number recovery method, and complex system.

Inactive Publication Date: 2021-03-16
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] In order to solve the inaccuracy of the traditional photon number recovery method, the closed-loop clock PPM time slot synchronization method needs closed-loop tracking, the system is more complex and the single ratio method is less robust

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  • Data recovery and open-loop synchronization method for optical PPM asynchronous sampling signal based on MPPC detection
  • Data recovery and open-loop synchronization method for optical PPM asynchronous sampling signal based on MPPC detection
  • Data recovery and open-loop synchronization method for optical PPM asynchronous sampling signal based on MPPC detection

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[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0062] The present invention provides a method for data recovery and open-loop synchronization of an optical PPM asynchronous sampling signal based on MPPC detection. The flow chart of the method is as follows figure 2 shown, including:

[0063] S1. Sampling the electrical signal output by the MPPC with an asynchronous clock more than twice the frequency of the PPM time slot, and then performing an FFT operation on the sampled signal;

[0064] S2, the initia...

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Abstract

The invention belongs to the field of space optical communication, and particularly relates to a data recovery and open-loop synchronization method for an optical PPM asynchronous sampling signal based on MPPC detection. The method comprises the following steps: firstly, carrying out fast Fourier transform (FFT) on a PPM asynchronous sampling signal, and then estimating the initial frequency offset and phase offset of the signal by using Quinn, Jacobsen and MacLed algorithms respectively; and performing photon number recovery on the PPM signal by frequency offset and phase offset estimation values through correlation operation, further solving time slot log likelihood ratio sequences corresponding to Quinn, Jacobsen and MacLed algorithms, and finally selecting a sequence with the maximum standard deviation from the three groups of time slot log likelihood ratio sequences as the input of an error correction decoder. The time slot synchronization method provided by the invention has veryhigh synchronization precision under extremely low optical power, is high in operation speed, and has relatively strong robustness compared with a single ratio method; for 64PPM modulation signals, the photon number recovery method provided by the invention only needs to detect 1.2 photons on average in each signal time slot, so that the bit error rate can be less than 1.0 e-4.

Description

technical field [0001] The invention belongs to the field of space optical communication, in particular to a method for data recovery and open-loop synchronization of an optical PPM asynchronous sampling signal based on MPPC detection. Background technique [0002] Deep space exploration requires higher and higher transmission capabilities. Pulse position modulation (PPM) combined with photon detection array has the advantages of high energy efficiency, strong anti-interference ability and high detection frequency, and has been widely used in deep space optical communication research. With the demand of deep space exploration, photon detectors with array structure are getting more and more attention. Multi-pixel photon counter (MPPC) as a photon detector with an array structure has the advantages of high gain, fast response, excellent time resolution, wide spectral response range, etc., and has a simple structure and low cost. In recent years, it has been widely used in las...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04J3/06H04B10/70H04B10/524
CPCH04B10/524H04B10/70H04J3/0602H04L7/0075
Inventor 向劲松张少华张卓胡东洋
Owner CHONGQING UNIV OF POSTS & TELECOMM
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