CN112953646B - Differential multi-pulse position modulation method and system - Google Patents
Differential multi-pulse position modulation method and system Download PDFInfo
- Publication number
- CN112953646B CN112953646B CN202110224902.3A CN202110224902A CN112953646B CN 112953646 B CN112953646 B CN 112953646B CN 202110224902 A CN202110224902 A CN 202110224902A CN 112953646 B CN112953646 B CN 112953646B
- Authority
- CN
- China
- Prior art keywords
- mapping constellation
- signal
- mppm
- dmppm
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
Abstract
The invention discloses a differential multi-pulse position modulation method and a differential multi-pulse position modulation system, which are applied to the technical field of pulse modulation and specifically comprise the following steps: obtaining data to be transmitted and subdividing the data into a plurality of groups of ordered sequences; modulating the laser and the ordered sequence to obtain an MPPM modulated signal, and carrying out differential processing on the MPPM modulated signal to obtain a DMPPM modulated signal; the MPPM modulation signal and the DMPPM modulation signal are converted to obtain a standard mapping constellation diagram and a first mapping constellation diagram; judging whether the first mapping constellation map has errors or not; if yes, replacing the data in the standard mapping constellation diagram; if not, outputting the first mapping constellation. According to the invention, the standard mapping constellation diagram and the first mapping constellation diagram are compared to judge whether the mistransmitted data occurs in the differential processing process, and the mistransmitted data is corrected through the correction module, so that the accuracy of data transmission is greatly improved.
Description
Technical Field
The invention relates to the technical field of differential multi-pulse position modulation, in particular to a differential multi-pulse position modulation method and a differential multi-pulse position modulation system.
Background
With the continuous development of the information era, a large amount of digital multimedia is emerging continuously, and a communication system with high transmission rate, large transmission capacity and wide coverage space becomes an international research hotspot. The wireless laser communication realizes the transmission and exchange of data such as images, voice and the like in links such as space (atmosphere, seawater or space) and the like by taking laser as a carrier wave.
The wireless laser communication has the advantages of strong anti-interference capability, high transmission frequency, good confidentiality and the like. The optical wave with extremely short wavelength is used as a carrier to carry out the communication between space satellites, and the optical communication method is the best scheme for realizing high-speed communication. In the day when space satellites are increasingly crowded, wireless laser communication has wide application prospect.
However, the error characteristic is an important index for measuring the data transmission accuracy of the communication system in a specified time, and because the length of the DMPPM symbol is not fixed, the analysis of the packet error rate error characteristic is difficult, and there is a great obstacle to the correction of the 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.
Disclosure of Invention
In view of this, the present invention provides a differential multi-pulse position modulation method and system, which not only improve the unit signaling rate of information transmission and the bandwidth requirement of communication, but also can ensure the accuracy of data.
In order to achieve the above purpose, the invention provides the following technical scheme:
the differential multi-pulse position modulation method comprises the following specific steps:
obtaining data to be transmitted and subdividing the data into a plurality of groups of ordered sequences; wherein the ordered sequence is a binary array;
modulating the laser and the ordered sequence to obtain an MPPM modulated signal, and carrying out differential processing on the MPPM modulated signal to obtain a DMPPM modulated signal;
the MPPM modulation signal and the DMPPM modulation signal are converted to obtain a standard mapping constellation diagram and a first mapping constellation diagram;
determining whether the first mapping constellation has errors by judging the first mapping constellation and the standard mapping constellation;
if yes, replacing the data in the standard mapping constellation diagram; if not, outputting the first mapping constellation.
Preferably, in the above differential multi-pulse position modulation method, each group of the ordered sequences is modulated into an information frame, where the information frame includes m time slots, the m time slots include p light pulses, and the duration of each light pulse is the same as the duration of the corresponding time slot.
Preferably, in the differential multi-pulse position modulation method, the differential processing deletes all empty time slots after the last pulse in each information frame period in the MPPM modulated signal to obtain the DMPPM modulated signal.
Preferably, in the above differential multi-pulse position modulation method, it is determined whether the first mapping constellation has an error, and the first mapping constellation and the standard mapping constellation are identified by an image identification model.
A differential multi-pulse position modulation system comprising: the device comprises a signal source, a laser, a modulator, a difference module, a constellation diagram conversion module, an image identification module, a correction module and an output module;
the signal source and the signal emitted by the laser pass through the modulator to obtain an MPPM modulation signal;
the MPPM modulation signal passes through the difference module to obtain a DMPPM modulation signal, and the MPPM modulation signal and the DMPPM modulation signal utilize the constellation map conversion module to obtain a standard mapping constellation map and a first mapping constellation map;
and the standard mapping constellation and the first mapping constellation are used as the input of the image identification module for comparison, the comparison result is fed back to the correction module, the correction is carried out through the correction module, and the corrected DMPPM modulation signal is output.
Preferably, in the above differential multi-pulse position modulation system, the constellation diagram conversion module includes an input unit, an MPPM symbol unit, a signal pulse slot coordinate unit, and an output unit;
the MPPM modulation signal and the DMPPM modulation signal sequentially pass through an MPPM symbol unit and a signal pulse time slot coordinate unit; and obtaining a mapping constellation diagram through the output unit according to the coordinates output by the signal pulse time slot coordinate unit.
Compared with the prior art, the differential multi-pulse position modulation method and system provided by the invention have the advantages that the differential module is added behind the modulator, the empty time slot after the last pulse in each frame of signal is deleted, the differential multi-pulse modulation is realized, and higher signaling rate can be realized in unit time. At the same time, the shortening of the information frame also means a reduction of the bandwidth requirements. Whether mistransmitted data occur in the differential processing process is judged by comparing the standard mapping constellation diagram with the first mapping constellation diagram, and the mistransmitted data are corrected by the correction module, so that the accuracy of data transmission is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of the process of the present invention;
FIG. 2 is a block diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The differential multi-pulse position modulation method, as shown in fig. 1, includes the following steps:
obtaining data to be transmitted and subdividing the data into a plurality of groups of ordered sequences; wherein the ordered sequence is a binary array;
modulating the laser and the ordered sequence to obtain an MPPM modulated signal, and carrying out differential processing on the MPPM modulated signal to obtain a DMPPM modulated signal;
the MPPM modulation signal and the DMPPM modulation signal are converted to obtain a standard mapping constellation diagram and a first mapping constellation diagram;
determining whether the first mapping constellation has errors by judging the first mapping constellation and a standard mapping constellation;
if yes, replacing the data in the standard mapping constellation diagram, and outputting a first mapping constellation diagram after replacement; if not, outputting the first mapping constellation.
In order to further optimize the technical scheme, each group of ordered sequences is modulated into an information frame, the information frame comprises m time slots, the m time slots comprise p optical pulses, and the duration of each optical pulse is the same as that of the corresponding time slot.
In order to further optimize the technical scheme, the difference processing is to delete all empty time slots after the last pulse in each information frame period in the MPPM modulation signal to obtain the DMPPM modulation signal.
In order to further optimize the technical scheme, whether the first mapping constellation has errors or not is determined, and the first mapping constellation and the standard mapping constellation are identified through an image identification model.
A differential multi-pulse position modulation system, as shown in fig. 2, comprising: the device comprises a signal source, a laser, a modulator, a difference module, a constellation diagram conversion module, an image identification module, a correction module and an output module;
signals transmitted by the signal source and the laser pass through the modulator to obtain an MPPM modulation signal;
the MPPM modulation signal passes through a difference module to obtain a DMPPM modulation signal, and the MPPM modulation signal and the DMPPM modulation signal utilize a constellation map conversion module to obtain a standard mapping constellation map and a first mapping constellation map;
and the standard mapping constellation and the first mapping constellation are used as the input of the image identification module for comparison, the comparison result is fed back to the correction module, the correction is carried out through the correction module, and the corrected DMPPM modulation signal is output.
In order to further optimize the technical scheme, 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 modulation signal and the DMPPM modulation signal sequentially pass through an MPPM symbol unit and a signal pulse time slot coordinate unit; and obtaining a mapping constellation diagram through an output unit according to the coordinates output by the signal pulse time slot coordinate unit.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable 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 applied to 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. The differential multi-pulse position modulation method is characterized by comprising the following specific steps of:
obtaining data to be transmitted and subdividing the data into a plurality of groups of ordered sequences; wherein the ordered sequence is a binary array; modulating laser and the ordered sequence to obtain an MPPM modulated signal, and carrying out differential processing on the MPPM modulated signal to obtain a DMPPM modulated signal; the MPPM modulation signal and the DMPPM modulation signal are converted to obtain a standard mapping constellation diagram and a first mapping constellation diagram;
determining whether the first mapping constellation has errors by judging the first mapping constellation and the standard mapping constellation;
if yes, replacing the data in the standard mapping constellation diagram; if not, outputting 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, the information frame comprises m time slots, the m time slots comprise p light pulses, and the duration of each light pulse is the same as the duration of the corresponding time slot.
3. The differential multi-pulse position modulation method according to claim 1, wherein the differential processing deletes all empty slots after the last pulse in each information frame period in the MPPM modulated signal to obtain the DMPPM modulated signal.
4. The differential multi-pulse position modulation method according to claim 1, wherein it is determined whether the first mapping constellation has an error, and the first mapping constellation and the standard mapping constellation are identified by an image recognition model.
5. A differential multi-pulse position modulation system, comprising: the device comprises a signal source, a laser, a modulator, a difference module, a constellation diagram conversion module, an image identification module, a correction module and an output module;
the signal source and the signal emitted by the laser pass through the modulator to obtain an MPPM modulation signal;
the MPPM modulation signal passes through the difference module to obtain a DMPPM modulation signal, and the MPPM modulation signal and the DMPPM modulation signal utilize the constellation map conversion module to obtain a standard mapping constellation map and a first mapping constellation map;
the standard mapping constellation and the first mapping constellation are used as the input of the image identification module for comparison, the comparison result is fed back to the correction module, the correction is carried out through the correction module, and the corrected DMPPM modulation signal is output; the correction module determines whether the first mapping constellation map has errors by judging the first mapping constellation map and a standard mapping constellation map;
if yes, replacing the data in the standard mapping constellation diagram, and outputting a first mapping constellation diagram after replacement; if not, outputting the first mapping constellation.
6. The differential multi-pulse position modulation system according to claim 5, wherein the constellation map conversion module comprises an input unit, an MPPM symbol unit, a signal pulse slot coordinate unit and an output unit;
the MPPM modulation signal and the DMPPM modulation signal sequentially pass through an MPPM symbol unit and a signal pulse time slot coordinate unit; and obtaining a mapping constellation diagram through the output unit according to the coordinates output by the signal pulse time slot coordinate unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110224902.3A CN112953646B (en) | 2021-03-01 | 2021-03-01 | Differential multi-pulse position modulation method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110224902.3A CN112953646B (en) | 2021-03-01 | 2021-03-01 | Differential multi-pulse position modulation method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112953646A CN112953646A (en) | 2021-06-11 |
| CN112953646B true CN112953646B (en) | 2022-04-19 |
Family
ID=76246903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110224902.3A Active CN112953646B (en) | 2021-03-01 | 2021-03-01 | Differential multi-pulse position modulation method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112953646B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112637096A (en) * | 2020-12-09 | 2021-04-09 | 西安理工大学 | Differential keying communication method based on chaotic shaping filter and pulse position modulation |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE602007004063D1 (en) * | 2007-02-06 | 2010-02-11 | Oerlikon Space Ag | Optical high-rate pulse position modulation scheme and optical communication system based thereon |
| US8682181B2 (en) * | 2011-03-05 | 2014-03-25 | Alcatel Lucent | System, method, and apparatus for high-sensitivity optical detection |
| CN102420791B (en) * | 2011-10-27 | 2013-10-09 | 清华大学深圳研究生院 | Bit zone difference pulse position modulation method and device |
| US9853734B1 (en) * | 2015-04-16 | 2017-12-26 | Inphi Corporation | Apparatus and methods for digital signal constellation transformation |
| US9960853B2 (en) * | 2016-10-04 | 2018-05-01 | The United States Of America As Represented By The Secretary Of The Navy | System and method for a differential pulse position modulation encoder and decoder |
| CN107659360A (en) * | 2017-10-25 | 2018-02-02 | 长春理工大学 | A kind of difference multi-pulse position modulation device |
| CN107682093A (en) * | 2017-10-25 | 2018-02-09 | 长春理工大学 | A kind of difference multi-pulse position modulation method |
-
2021
- 2021-03-01 CN CN202110224902.3A patent/CN112953646B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112637096A (en) * | 2020-12-09 | 2021-04-09 | 西安理工大学 | Differential keying communication method based on chaotic shaping filter and pulse position modulation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112953646A (en) | 2021-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9973964B2 (en) | Enterprise cognitive radio integrated with laser communications | |
| EP0712258A2 (en) | Apparatus for testing mobile radio communication stations | |
| CN108632186B (en) | Digital information detection method of environmental signal backscattering system based on MFSK modulation | |
| CN113541800A (en) | Communication method between base station and terminal and corresponding communication system | |
| CN109932724B (en) | Ultra-wideband laser communication and ranging integrated device and method | |
| CN102752058B (en) | Audio data transmission system, audio data transmission device and electronic sign tool | |
| CN102035602B (en) | Optimal channel coding modulation-based adaptive optical transmission system and method | |
| CN112953646B (en) | Differential multi-pulse position modulation method and system | |
| CN1284307C (en) | Communication system for CDMA | |
| KR20110100197A (en) | Complex optical modulation for real time communication | |
| CN115802082A (en) | Vehicle-mounted video distribution equipment, method, device, terminal and storage medium | |
| CN111865848B (en) | Signal modulation format identification method and system | |
| US7352301B2 (en) | Method for transmitting a data flow over an optical bus, corresponding system and computer program product | |
| CN115327475A (en) | System, method and equipment for positioning cluster receiving end based on ultraviolet light scattering communication | |
| CN103973592A (en) | Cell processing method and device | |
| CN107294601A (en) | The method and device of signal transmission | |
| CN107423648B (en) | RFID reader capable of improving forward anti-interference function | |
| JPS6148250A (en) | Space light transmission system | |
| CN210670239U (en) | Uncompressed high-definition video transmission system | |
| CN107800477A (en) | A kind of visible light communication method of reseptance based on camera | |
| US11552917B2 (en) | Verification system for message delivery and processing | |
| CN114513523B (en) | Data synchronization method, device, equipment and storage medium | |
| CN117574930B (en) | Method and device for generating three-dimensional bar code information, electronic equipment and readable medium | |
| WO2024038543A1 (en) | Optically modulated signal generation device and transmission module | |
| CN116800338A (en) | Underwater turbulence-resistant wireless optical communication system based on quasi-coherent modulation technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |