CN112953646B - Differential multi-pulse position modulation method and system - Google Patents

Abstract

The invention discloses a differential multi-pulse position modulation method and system, which are applied to the technical field of pulse modulation. The specific steps are as follows: obtaining data to be transmitted and subdividing them into multiple groups of ordered sequences; modulating laser light with the ordered sequences, Obtain the MPPM modulated signal, and perform differential processing on the MPPM modulated signal to obtain a DMPPM modulated signal; the MPPM modulated signal and the DMPPM modulated signal are converted to obtain a standard mapping constellation diagram and a first mapping constellation diagram; By judging the first mapping Whether there is an error in the constellation diagram; if there is, use the data in the standard mapping constellation diagram to replace; if not, output the first mapping constellation diagram. By comparing the standard mapping constellation diagram and the first mapping constellation diagram, the invention judges whether mistransmitted data occurs in the differential processing process, and corrects the mistransmitted data through a correction module, thereby greatly improving the accuracy of data transmission.

Description

Differential multi-pulse position modulation method and system

technical field

The present invention relates to the technical field of differential multi-pulse position modulation, and more particularly to a differential multi-pulse position modulation method and system.

Background technique

With the continuous development of the information age, a large number of digital multimedia continue to emerge, and the communication system with fast transmission rate, large transmission capacity and wide coverage has become an international research hotspot. Wireless laser communication realizes the transmission and exchange of data such as image and voice in space (atmosphere, seawater or space) using laser as a carrier.

Wireless laser communication has the advantages of strong anti-interference ability, high transmission frequency and good confidentiality. Using light waves with extremely short wavelengths as carriers to communicate between space satellites is the best solution to achieve high-speed communication. In today's increasingly crowded space satellites, wireless laser communication has broad application prospects.

However, the error characteristic is an important indicator to measure the accuracy of data transmission in a communication system within a specified time. Because the DMPPM symbol length is not fixed, it is difficult to analyze the error characteristic of its packet error rate, and there is a great obstacle to the correction of data transmission accuracy.

Therefore, how to provide a differential multi-pulse position modulation method and system capable of ensuring accurate data transmission is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a differential multi-pulse position modulation method and system, which not only improves the unit signal rate of information transmission and the bandwidth requirement of communication, but also ensures the accuracy of data.

In order to achieve the above object, the present invention provides the following technical solutions:

Differential multi-pulse position modulation method, the specific steps are as follows:

Obtaining data to be transmitted is subdivided into multiple groups of ordered sequences; wherein, the ordered sequences are binary arrays;

modulating the laser and the ordered sequence to obtain an MPPM modulation signal, and performing differential processing on the MPPM modulation signal to obtain a DMPPM modulation signal;

Converting the MPPM modulation signal and the DMPPM modulation signal to obtain a standard mapping constellation diagram and a first mapping constellation diagram;

Determine whether there is an error in the first mapping constellation by judging the first mapping constellation and the standard mapping constellation;

If it exists, use the data in the standard mapping constellation for replacement; if it does not exist, output the first mapping constellation.

Preferably, in the above-mentioned differential multi-pulse position modulation method, each group of the ordered sequences is modulated into an information frame, the information frame includes m time slots, and the m time slots include p optical pulse, and the duration of each optical pulse is the same as the duration of the time slot.

Preferably, in the above differential multi-pulse position modulation method, in the differential processing, all empty time slots after the last pulse in each information frame period in the MPPM modulated signal are deleted to obtain the DMPPM modulated signal.

Preferably, in the above differential multi-pulse position modulation method, it is determined whether there is an error in the first mapping constellation, and an image recognition model is used to identify the first mapping constellation and the standard mapping constellation.

Differential multi-pulse position modulation system, including: signal source, laser, modulator, differential module, constellation conversion module, image recognition module, correction module and output module;

The signal emitted by the signal source and the laser obtains the MPPM modulation signal through the modulator;

The MPPM modulation signal obtains a DMPPM modulation signal through the differential module, and the MPPM modulation signal and the DMPPM modulation signal obtain a standard mapping constellation diagram and a first mapping constellation diagram by using the constellation diagram conversion module;

The standard mapping constellation diagram and the first mapping constellation diagram are used as the input of the image recognition module for comparison, and the comparison result is fed back to the correction module, and the correction module is used for correction, and the corrected DMPPM modulation signal is output.

Preferably, in the above differential multi-pulse position modulation system, the constellation conversion module includes an input unit, an MPPM symbol unit, a signal pulse time slot coordinate unit and an output unit;

The MPPM modulated signal and the DMPPM modulated signal sequentially pass through the MPPM symbol unit and the signal pulse time slot coordinate unit; a mapping constellation diagram is obtained through the output unit according to the coordinates output by the signal pulse time slot coordinate unit.

It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a differential multi-pulse position modulation method and system. A differential module is added after the modulator, and the empty time slot after the last pulse in each frame of signal is deleted. , to achieve differential multi-pulse modulation, which can have a higher signal transmission rate per unit time. At the same time, due to the shortening of the information frame, it also means a reduction in bandwidth requirements. By comparing the standard mapping constellation diagram and the first mapping constellation diagram, it is judged whether there is mistransmitted data in the differential processing process, and the mistransmission data is corrected by the correction module, which greatly improves the accuracy of data transmission.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative efforts.

Fig. 1 accompanying drawing is the method flow chart of the present invention;

Figure 2 is a structural block diagram of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The differential multi-pulse position modulation method is shown in Figure 1, and the specific steps are as follows:

The acquired data to be transmitted is subdivided into multiple groups of ordered sequences; wherein, the ordered sequences are binary arrays;

Modulate the laser and the ordered sequence to obtain the MPPM modulation signal, and perform differential processing on the MPPM modulation signal to obtain the DMPPM modulation signal;

Convert the MPPM modulated signal and the DMPPM modulated signal to obtain a standard mapping constellation diagram and a first mapping constellation diagram;

Determine whether there is an error in the first mapping constellation by judging the first mapping constellation and the standard mapping constellation;

If it exists, use the data in the standard mapping constellation for replacement, and output the replaced first mapping constellation; if not, output the first mapping constellation.

In order to further optimize the above technical solution, each group of ordered sequences is modulated into an information frame, the information frame contains m time slots, the m time slots contain p optical pulses, and the duration of each optical pulse is the same as the time it is in. The gap duration is the same.

In order to further optimize the above technical solution, differential processing is used to delete all empty time slots after the last pulse in each information frame period in the MPPM modulated signal to obtain the DMPPM modulated signal.

In order to further optimize the above technical solution and determine whether there is an error in the first mapping constellation, an image recognition model is used to identify the first mapping constellation and the standard mapping constellation.

The differential multi-pulse position modulation system, as shown in Figure 2, includes: a signal source, a laser, a modulator, a differential module, a constellation diagram conversion module, an image recognition module, a correction module and an output module;

The signal emitted by the signal source and the laser passes through the modulator to obtain the MPPM modulation signal;

The MPPM modulation signal obtains the DMPPM modulation signal through the differential module, and the MPPM modulation signal and the DMPPM modulation signal use the constellation diagram conversion module to obtain the standard mapping constellation diagram and the first mapping constellation diagram;

The standard mapping constellation diagram and the first mapping constellation diagram are used as the input of the image recognition module for comparison, and the comparison result is fed back to the correction module, and the correction module is used for correction, and the corrected DMPPM modulation signal is output.

In order to further optimize the above technical solution, the constellation diagram conversion module includes an input unit, an MPPM symbol unit, a signal pulse time slot coordinate unit and an output unit;

The MPPM modulated signal and the DMPPM modulated signal pass through the MPPM symbol unit and the signal pulse time slot coordinate unit in turn; the mapping constellation diagram is obtained through the output unit according to the coordinates output by the signal pulse time slot coordinate unit.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. Differential multi-pulse position modulation method, is characterized in that, concrete steps are as follows: The acquired data to be transmitted is subdivided into multiple groups of ordered sequences; wherein, the ordered sequences are binary arrays; the laser is modulated with the ordered sequences to obtain MPPM modulation signals, and the MPPM modulation signals are subjected to differential processing obtaining a DMPPM modulated signal; the MPPM modulated signal and the DMPPM modulated signal are converted to obtain a standard mapping constellation diagram and a first mapping constellation diagram; Determine whether there is an error in the first mapping constellation by judging the first mapping constellation and the standard mapping constellation; If it exists, use the data in the standard mapping constellation for replacement; if it does not exist, output the first mapping constellation. 2 . The differential multi-pulse position modulation method according to claim 1 , wherein each group of the ordered sequences is modulated into an information frame, and the information frame includes m time slots, and the m time slots. 3 . A slot contains p optical pulses, and the duration of each optical pulse is the same as that of the time slot. 3. The differential multi-pulse position modulation method according to claim 1, wherein, in the differential processing, all empty time slots after the last pulse in each information frame period in the MPPM modulated signal are deleted to obtain the DMPPM modulated signal . 4. The differential multi-pulse position modulation method according to claim 1, wherein, determining whether there is an error in the first mapping constellation, and identifying the first mapping constellation and the standard mapping through an image recognition model Constellation. 5. A differential multi-pulse position modulation system, comprising: a signal source, a laser, a modulator, a differential module, a constellation diagram conversion module, an image recognition module, a correction module and an output module; The signal emitted by the signal source and the laser obtains the MPPM modulation signal through the modulator; The MPPM modulation signal obtains a DMPPM modulation signal through the differential module, and the MPPM modulation signal and the DMPPM modulation signal obtain a standard mapping constellation diagram and a first mapping constellation diagram by using the constellation diagram conversion module; The standard mapping constellation diagram and the first mapping constellation diagram are used as the input of the image recognition module, and are compared, and the comparison result is fed back to the correction module, and the correction module is modified to output the modified DMPPM modulation signal; the correction module Determine whether there is an error in the first mapping constellation by judging the first mapping constellation and the standard mapping constellation; If it exists, use the data in the standard mapping constellation for replacement, and output the replaced first mapping constellation; if not, output the first mapping constellation. 6. The differential multi-pulse position modulation system according to claim 5, wherein the constellation diagram conversion module comprises an input unit, an MPPM symbol unit, a signal pulse time slot coordinate unit and an output unit; The MPPM modulated signal and the DMPPM modulated signal sequentially pass through the MPPM symbol unit and the signal pulse time slot coordinate unit; a mapping constellation diagram is obtained through the output unit according to the coordinates output by the signal pulse time slot coordinate unit.

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