CN113347129A - Communication method, device and system for data bidirectional transmission - Google Patents
Communication method, device and system for data bidirectional transmission Download PDFInfo
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- CN113347129A CN113347129A CN202110615715.8A CN202110615715A CN113347129A CN 113347129 A CN113347129 A CN 113347129A CN 202110615715 A CN202110615715 A CN 202110615715A CN 113347129 A CN113347129 A CN 113347129A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2537—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to scattering processes, e.g. Raman or Brillouin scattering
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- 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
- H04B10/5161—Combination of different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
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Abstract
The invention discloses a communication method, a device and a system for data bidirectional transmission, wherein the method comprises the following steps: and generating a corresponding frame type to select the optimal modulation format, modulation rate and time slot ratio of the traffic information according to the communication service information and the channel state. The first side device and the second side device establish time division bidirectional communication by performing negotiation communication using a request frame, a response frame, and an information frame, changing respective modulation formats and modulation rates, and changing the ratio of a transmission time slot, a reception time slot, an illumination time slot, and other time slots. The method realizes flexible modulation format and speed of data transmission according to different channel characteristics of communication equipment of two parties, reasonably allocates the optimal time slot ratio of a time division duplex mode, solves the problem of backscattering interference generated by signal light, illumination light and other light of communication equipment, improves the data speed by improving the bandwidth utilization rate of a data packet, and realizes time division multiplexing of a multi-optical-path function.
Description
Technical Field
The invention belongs to the technical field of underwater optical communication, and particularly relates to a communication method, device and system for bidirectional data transmission.
Background
The underwater blue-green laser communication is one of important technologies in the current underwater wireless communication field, and compared with a one-way transmission mode, the two-way communication mode adopted in the submarine wireless optical communication field has the characteristics of high reliability and more stable transmission, but the underwater optical communication two-way transmission has the problem of backscattering interference, and the backscattering can seriously affect the channel characteristics, so that the quality of a received signal is poor, the signal-to-noise ratio is low, the bit error rate is high, and the packet loss rate of service transmission is high.
At present, in order to solve the problem of backscattering interference in bidirectional underwater wireless optical communication, a transmission mode of time division duplex is generally adopted to change underwater blue-green laser transmission into half duplex, that is, for any end device, data is not received when being transmitted, and data is not transmitted when being received. In the field of underwater wireless optical communication, the speed and distance of blue-green laser transmission can be improved by adopting RS channel coding of forward error correction and PPM modulation mode. However, the current underwater bidirectional communication is mainly based on a mode of fixed rate, fixed modulation coding format and fixed bidirectional communication time slot occupation ratio, and has the problem that the link adaptability under the condition of dynamic change of channel characteristics and service characteristics cannot be met. In addition to the back scattering interference caused by the light transmitted by the local terminal equipment, the noise influence on the underwater optical communication signal can be caused by equipment such as underwater camera illumination, underwater laser detection and the like, and the problem of back scattering interference caused by the signal light, illumination light and other light of the communication equipment exists.
Disclosure of Invention
Therefore, the communication method, the device and the system for data bidirectional transmission provided by the invention overcome the defects that the prior art cannot meet the defects of poor link adaptability under the condition of dynamic change of channel characteristics and service characteristics and back scattering interference generated by signal light, illumination light and other light of communication equipment.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a communication method for bidirectional data transmission, where the communication method is executed by a first side platform device, and the method includes:
receiving an optical communication signal of second-side platform equipment, generating the position of the optimal modulation format of a command word according to the optical communication signal, and sending a first request frame corresponding to the optimal modulation format to the second-side platform equipment;
after receiving a first response frame sent by the second side platform equipment, changing the modulation format of the second side platform equipment, and sending an information frame with the changed modulation format to the second side platform equipment;
generating the position of the optimal modulation rate of the command word according to the bit error rate of the first side platform equipment system, and sending a second request frame corresponding to the optimal modulation rate to the second side platform equipment;
after receiving a second response frame sent by the second side platform equipment, changing the modulation rate of the second side platform equipment, and sending an information frame of which the modulation rate is changed to the second side platform equipment;
adjusting the rate according to the error rate, counting the uplink and downlink traffic when the error rate meets a first preset condition, generating the position of a command word corresponding to the optimal time slot ratio of the traffic information, and sending a third request frame for adjusting the optimal time slot ratio of the sending time slot, the receiving time slot, the lighting time slot and other time slots;
and after receiving a third response frame sent by the second side platform equipment, changing the self sending time slot, the receiving time slot, the lighting time slot and other time slot ratios, sending a data frame for establishing connection to the second side platform equipment, and establishing time division bidirectional transmission.
Preferably, the step of generating the position of the optimal modulation format of the command word from the optical communication signal comprises:
averagely dividing the modulation format of the signal modulation format control module according to a first preset value;
the signal modulation format control module analyzes the optical communication signal by using a first preset algorithm and calculates a first preset coefficient;
and judging the threshold range of the first preset coefficient by using the first preset threshold to generate the position of the optimal modulation format of the command word, wherein each threshold range respectively corresponds to the optimal modulation format of the command word.
Preferably, the step of generating a position of an optimal modulation rate of the command word according to the bit error rate of the first side platform device system includes:
averagely dividing the signal rate of the signal rate control module according to a second preset value;
the signal rate control module analyzes the channel error rate by using a second preset algorithm and calculates a second preset coefficient;
and judging the threshold value range of the second preset coefficient by using a second preset threshold value, wherein each threshold value range corresponds to the optimal modulation rate of the command word, and when the error rate meets a second preset condition, generating the position of the optimal modulation rate of the command word.
Preferably, the step of counting the uplink and downlink traffic and generating the position of the optimal time slot ratio of the command word includes:
dividing the time slot ratio of the time slot control module traffic according to a third preset value;
the time slot control module analyzes the sending traffic and the receiving traffic of the first side platform equipment by using a third preset algorithm and calculates a third preset coefficient;
and judging the threshold range of a third preset coefficient by using a third preset threshold, and generating the position of the optimal time slot ratio of the command word, wherein each threshold range corresponds to the optimal time slot ratio of the command word respectively.
A second aspect of the embodiments of the present invention provides a communication method for bidirectional data transmission, where the communication method is executed by a second side platform device, and the method includes:
changing the modulation format of the self equipment according to the received first request frame, and sending a first response frame with the changed modulation format;
according to the received information frame of which the modulation format is changed by the first side platform, establishing time division bidirectional communication of the modulation format at first preset time;
changing the modulation rate of the self equipment according to the received second request frame, and sending a second response frame for changing the modulation rate;
according to the received information frame of which the modulation rate is changed by the first side platform, establishing time division bidirectional communication of a new modulation rate at a second preset time;
and changing the time slot ratio of the self device according to the received third request frame, and transmitting a third response frame for changing the transmission time slot, the receiving time slot, the lighting time slot and other time slot ratios.
Preferably, the communication method of data bidirectional transmission is used for underwater wireless optical communication and other space wireless optical communication.
A third aspect of the embodiments of the present invention provides a communication apparatus for bidirectional data transmission, which is executed by a first side platform device, and includes:
the optimal modulation format request unit is used for receiving an optical communication signal of the second-side platform equipment, generating the position of the optimal modulation format of the command word according to the optical communication signal, and sending a first request frame corresponding to the optimal modulation format to the second-side platform equipment;
the modulation format changing unit is used for changing the modulation format of the modulation format after receiving the first response frame sent by the second-side platform equipment and sending the information frame with the changed modulation format to the second-side platform equipment;
the optimal modulation rate request unit is used for generating the position of the optimal modulation rate of the command word according to the error rate of the first side platform equipment system and sending a second request frame corresponding to the optimal modulation rate to the second side platform equipment;
the optimal modulation rate changing unit is used for changing the modulation rate of the optimal modulation rate after receiving a second response frame sent by the second side platform equipment and sending an information frame with the changed modulation rate to the second side platform equipment;
the optimal time slot ratio request unit is used for adjusting the rate according to the error rate, counting the uplink and downlink traffic when the error rate meets a first preset condition, generating the position of a command word corresponding to the optimal time slot ratio of the traffic information, and sending a third request frame for adjusting the optimal time slot ratio of the sending time slot, the receiving time slot, the lighting time slot and other time slots;
and the optimal time slot ratio changing unit is used for changing the self sending time slot, the receiving time slot, the lighting time slot and other time slot ratios after receiving the third response frame sent by the second side platform equipment, sending a data frame for establishing connection to the second side platform equipment, and establishing time division bidirectional transmission.
A fourth aspect of the present invention provides a communication apparatus for bidirectional data transmission, where the communication apparatus is executed by a second side platform device, and the apparatus includes:
the optimal modulation format request feedback unit is used for changing the modulation format of the self equipment according to the received first request frame and sending a first response frame for changing the modulation format;
the modulation format communication establishing unit is used for establishing time division bidirectional communication of the modulation format at first preset time according to the received information frame of which the first side platform changes the modulation format;
an optimal modulation rate request feedback unit, configured to change the modulation rate of the device itself according to the received second request frame, and send a second response frame that changes the modulation rate;
the modulation rate communication establishing unit is used for establishing time division bidirectional communication of a new modulation rate at a second preset time according to the received information frame of which the modulation rate is changed by the first side platform;
and the optimal time slot ratio request feedback unit is used for changing the transmitting time slot, the receiving time slot, the lighting time slot and other time slot ratios of the self equipment according to the received third request frame and transmitting a third response frame with the changed time slot ratio.
Preferably, the communication device for data bidirectional transmission is used for underwater blue-green laser communication.
A fifth aspect of the present invention provides a communication system for bidirectional data transmission, including: a first side stage apparatus and a second side stage apparatus,
the first side platform equipment receives an optical communication signal of the second side platform equipment, generates the position of the optimal modulation format of the command word according to the optical communication signal, sends a first request frame corresponding to the optimal modulation format to the second side platform equipment, and the second side platform equipment changes the modulation format of the equipment according to the received first request frame and sends a first response frame for changing the modulation format;
the first side platform equipment changes the modulation format of the first side platform equipment after receiving a first response frame sent by the second side platform equipment and sends an information frame with the changed modulation format to the second side platform equipment, and the second side platform equipment establishes time division bidirectional communication of the modulation format at first preset time according to the received information frame with the changed modulation format of the first side platform equipment;
the first side platform equipment generates the position of the optimal modulation rate of the command word according to the bit error rate of a first side platform equipment system, and sends a second request frame corresponding to the optimal modulation rate to second side platform equipment, and the second side platform equipment changes the modulation rate of the equipment per se according to the received second request frame and sends a second response frame for changing the modulation rate;
the first side platform equipment changes the self modulation rate after receiving a second response frame sent by the second side platform equipment, and sends an information frame with the changed modulation rate to the second side platform equipment, and the second side platform equipment establishes time division bidirectional communication of a new modulation rate at second preset time according to the received information frame with the changed modulation rate of the first side platform equipment;
the first side platform equipment adjusts the rate according to the error rate, when the error rate meets a first preset condition, the first side platform equipment counts uplink and downlink traffic, generates the position of a command word corresponding to the optimal time slot proportion of traffic information, and sends a third request frame for adjusting the optimal time slot proportion of a sending time slot, a receiving time slot, an illuminating time slot and other time slots, and the second side platform equipment changes the sending time slot, the receiving time slot, the illuminating time slot and other time slot proportions of the equipment according to the received third request frame and sends a third response frame for changing the time slot proportion;
and after receiving the third response frame sent by the second side platform equipment, the first side platform equipment changes the self sending time slot, the receiving time slot, the lighting time slot and other time slot ratios, sends a data frame for establishing connection to the second side platform equipment, and establishes time division bidirectional transmission.
The technical scheme of the invention has the following advantages:
1. the invention provides a communication method, a device and a system for data bidirectional transmission, which are characterized in that according to communication service information and a channel state, a corresponding frame type is generated to select the optimal modulation format, modulation rate and time slot ratio of the service volume information. The first side device and the second side device establish time division bidirectional communication by performing negotiation communication using a request frame, a response frame, and an information frame, changing respective modulation formats and modulation rates, and changing the ratio of a transmission time slot, a reception time slot, an illumination time slot, and other time slots. According to different channel characteristics of communication equipment, flexible modulation format and speed of data transmission are realized, the optimal time slot ratio of a time division duplex mode is reasonably distributed, the problem of backscattering interference generated by signal light, illumination light and other light of communication equipment is solved, the signal light, the illumination light and other light sources of the equipment respectively work in respective time slots, and the light sources are not interfered with each other. The data rate is improved by improving the bandwidth utilization rate of the data packet, and the time division multiplexing of the multi-optical-path function is realized.
2. According to the communication method, the device and the system for data bidirectional transmission, the first side platform device is arranged on the seabed and can be applied to complex and variable underwater environments, the change of the underwater environment influences the characteristics of an optical channel, and under the condition of the constantly changing optical channel, the modulation format and the modulation rate can be dynamically adjusted to enable the communication to achieve the best performance.
3. The communication method, the device and the system for data bidirectional transmission can be applied to underwater seabed, solve the problem of signal interference of light channels in underwater back scattering light and other illumination and detection lasers, enable the sending light, the receiving light, the illumination light and the other light not to interfere with each other, and realize time division multiplexing of multiple light paths.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present invention;
fig. 2 is a schematic diagram of protocol interaction of a communication system for bidirectional data transmission according to an embodiment of the present invention
Fig. 3 is a block diagram of a frame structure according to an embodiment of the present invention;
fig. 4 is a system block diagram of a transmission device according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating steps of a specific example of a communication method for bidirectional data transmission according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating steps of another specific example of a communication method for bidirectional data transmission according to an embodiment of the present invention;
fig. 7 is a block diagram illustrating a specific example of a communication device for bidirectional data transmission according to an embodiment of the present invention;
fig. 8 is a block diagram of another specific example of a communication device for bidirectional data transmission according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. 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.
An embodiment of the present invention provides a communication system for bidirectional data transmission, and fig. 1 is a schematic view of an application scenario of an embodiment of the present invention. The underwater optical communication is performed by the first side platform device and the second side platform device which are connected underwater. The first side platform equipment is arranged on the sea floor, the second side platform equipment is controlled by a master control platform on the sea level to perform underwater operation, and communication is established with the first side platform equipment on the sea floor, so that information such as a sea floor video acquired by the first side platform equipment is uploaded to the second side platform equipment and further can be uploaded to the sea level.
The first side platform equipment consists of an underwater seabed base station, a sensor platform, an underwater equipment platform such as an ROV or UUV and other sending equipment such as a receiving end, a sending end and recruitment equipment. The second side equipment platform comprises an ROV or a UUV and other various equipment hung in the air or on the deck or a water surface buoy, a submerged buoy or a water surface air vehicle platform, a receiving end, a sending end, lighting equipment, other sending equipment and the like. The second side platform device and the first side platform device can be switched with each other, and the two devices are connected through a time division duplex protocol, so that bidirectional data transmission is realized.
Examples
An embodiment of the present invention provides a communication system for bidirectional data transmission, as shown in fig. 2, including: a first side stage apparatus and a second side stage apparatus.
In the embodiment of the present invention, the first side platform device receives an optical communication signal of the second side platform device, generates a position of an optimal modulation format of a command word according to the optical communication signal, and sends a first request frame corresponding to the optimal modulation format to the second side platform device, and the second side platform device changes a modulation format of its own device according to the received first request frame and sends a first response frame changing the modulation format.
In a specific embodiment, the first side platform device determines the optimal modulation format according to the intensity of the optical signal. The weak signal can be in a high-order modulation format to improve the sensitivity. The signal intensity can be in a low-order modulation format, and the information transmission quantity is improved. The first side device is placed on the seafloor and when light from the second side device is detected, a change modulation format is sent to the second side platform device telling the second side device to prepare itself for the change. And the second side equipment receives the data and changes the modulation format thereof, and feeds back the data to the first side equipment. The platform devices on both sides can know that the modulation format needs to be changed, and can negotiate with each other.
As shown in fig. 3, the command word consists of three 8-bit bytes (CMD0, CMD1, CMD2), the first byte has 7, 8 bits to indicate the indication of the rate, 5, 6 bits to indicate the modulation format, the lower four bits to indicate the current frame type (request, response, information), the upper four bits of the second byte to indicate the transmitted time slot, and the lower four bits to indicate the received time slot. The upper four bits of the third byte represent the time slots of illumination and the lower four bits represent the other time slots. By way of example only, and not by way of limitation, in practical applications, the rate, modulation format, and location of the current frame type in the byte may be transformed and determined according to practical situations. For example: the position of the corresponding modulation format in the command word is generated, and if the current modulation format is 01, and the optimum modulation format is determined to be 11, the position 01 needs to be changed to 11.
In the embodiment of the present invention, after receiving the first response frame sent by the second side platform device, the first side platform device changes its modulation format, and sends an information frame with the changed modulation format to the second side platform device. And the second side platform equipment establishes time division bidirectional communication of the modulation format at the first preset time according to the received information frame of which the modulation format is changed by the first side platform.
In a specific embodiment, the first side subsea equipment (first side platform equipment) knows that the other side has changed, and changes its modulation format. The information frame whose modulation format has been changed is transmitted to the partner apparatus (second-side platform apparatus). After receiving the information frame, the opposite device also sends the information frame with changed modulation format to establish time division two-way communication. At this time, communication after changing the modulation format is established.
In the embodiment of the present invention, the first side platform device generates a position of an optimal modulation rate of the command word according to the bit error rate of the first side platform device system, and sends a second request frame corresponding to the optimal modulation rate to the second side platform device. And the second side platform equipment changes the modulation rate of the self equipment according to the received second request frame and sends a second response frame for changing the modulation rate. The specific implementation process refers to the process of modulation format communication establishment.
In the embodiment of the present invention, after receiving the second response frame sent by the second side platform device, the first side platform device changes its own modulation rate, and sends the information frame with the changed modulation rate to the second side platform device. And the second side platform equipment establishes time division bidirectional communication of a new modulation rate at a second preset time according to the received information frame of which the modulation rate is changed by the first side platform. The specific implementation process refers to the process of modulation format communication establishment. The two devices negotiate the current optimal modulation rate and establish communication after the rate is changed.
In the embodiment of the invention, the first side platform device adjusts the rate according to the error rate, when the error rate meets a first preset condition, the first side platform device counts the uplink and downlink traffic, generates the position of a command word corresponding to the optimal time slot proportion of the traffic information, and sends a third request frame for adjusting the optimal time slot proportion of the sending time slot, the receiving time slot, the lighting time slot and other time slots. And the second side platform device changes the sending time slot, the receiving time slot, the lighting time slot and other time slot ratios of the self device according to the received third request frame, and sends a third response frame for changing the sending time slot, the receiving time slot, the lighting time slot and other time slot ratios. The specific implementation process refers to the process of modulation format communication establishment.
In the embodiment of the invention, after receiving the third response frame sent by the second side platform device, the first side platform device changes the self sending time slot, the receiving time slot, the lighting time slot and other time slot ratios, sends the data frame for establishing connection to the second side platform device, and establishes time division bidirectional transmission. The specific implementation process refers to the process of modulation format communication establishment. The signal light, the lighting light and other light sources of the equipment respectively work in respective time slots, the light sources do not interfere with each other, the two equipment negotiate the current optimal time slot ratio, and the communication after the time slot ratio is changed is established.
In an embodiment of the present invention, the step of generating the position of the optimal modulation format of the command word according to the optical communication signal includes: and averagely dividing the modulation format of the signal modulation format control module according to a first preset value. The signal modulation format control module analyzes the optical communication signal by using a first preset algorithm and calculates a first preset coefficient. And judging the threshold range of the first preset coefficient by using the first preset threshold to generate the position of the optimal modulation format of the command word, wherein each threshold range respectively corresponds to the optimal modulation format of the command word. And judging the optimal modulation format according to the strength of the optical signal.
In the embodiment of the present invention, the step of generating the position of the optimal modulation rate of the command word according to the bit error rate of the first side platform device system includes: and averagely dividing the signal rate of the signal rate control module according to a second preset value. And the signal rate control module analyzes the channel error rate by using a second preset algorithm and calculates a second preset coefficient. And judging the threshold value range of the second preset coefficient by using a second preset threshold value, wherein each threshold value range corresponds to the optimal modulation rate of the command word, and when the error rate meets a second preset condition, generating the position of the optimal modulation rate of the command word. And judging the optimal modulation rate according to the calculated error rate.
In the embodiment of the invention, the step of counting the uplink and downlink traffic and generating the position of the optimal time slot ratio of the command word comprises the following steps: and averagely dividing the time slot ratio of the traffic of the time slot control module according to a third preset value. And the time slot control module analyzes the sending traffic and the receiving traffic of the first side platform equipment by using a third preset algorithm and calculates a third preset coefficient. And judging the threshold range of a third preset coefficient by using a third preset threshold, and generating the position of the optimal time slot ratio of the command word, wherein each threshold range corresponds to the optimal time slot ratio of the command word respectively. And judging the optimal time slot ratio according to the traffic.
In the embodiment of the invention, the communication method for data bidirectional transmission is used for underwater wireless optical communication and other space wireless optical communication.
In an embodiment of the present invention, as shown in fig. 4, a system block diagram of a communication device is transmitted. The method comprises the following steps: MCU control unit, FPGA agreement control unit and FPGA signal processing unit.
And the MCU control unit is used for completing light signal acquisition, judging light intensity and controlling illumination. The FPGA signal processing unit is used as a main body to finish the acquisition, coding, modulation and time division duplex protocol transmission of video services. The FPGA protocol control unit is used for calculating the error rate, changing the command word corresponding to the rate, completing the statistics of uplink and downlink services, changing the corresponding command word of the time slot ratio, and changing the command word corresponding to the modulation format according to the light intensity and voltage of the MCU
According to the communication system for bidirectional data transmission provided by the embodiment of the invention, the flexible modulation format and rate of data transmission are realized according to different channel characteristics of equipment of two communication parties, the optimal time slot ratio of a time division duplex mode is reasonably distributed, signal light, illumination light and other light sources of the equipment respectively work in respective time slots, the light sources are not interfered with each other, the data rate is improved by improving the bandwidth utilization rate of a data packet, and the time division multiplexing of a multi-optical-path function is realized.
An embodiment of the present invention further provides a communication method for bidirectional data transmission, which is executed by a first side platform device, as shown in fig. 5, where the method includes:
step 1: and receiving an optical communication signal of the second side platform equipment, generating the position of the optimal modulation format of the command word according to the optical communication signal, and sending a first request frame corresponding to the optimal modulation format to the second side platform equipment.
In one embodiment, the first side determines the best modulation format and then tells the opposite end that a change is needed.
Step 2: and after receiving the first response frame sent by the second side platform equipment, changing the modulation format of the second side platform equipment, and sending the information frame with the changed modulation format to the second side platform equipment.
In a specific embodiment, the first side device receives the response from the peer end, which indicates that the first side device knows that the peer end has received the request and changed the modulation format, and then may send an information frame with the changed modulation format to the peer end device.
And step 3: and generating the position of the optimal modulation rate of the command word according to the error rate of the first side platform equipment system, and sending a second request frame corresponding to the optimal modulation rate to the second side platform equipment.
In a specific embodiment, the first peer platform device determines the optimal modulation rate and informs the peer end of the need to change.
And 4, step 4: and after receiving a second response frame sent by the second side platform equipment, changing the modulation rate of the second side platform equipment, and sending an information frame with the changed modulation rate to the second side platform equipment.
In a specific embodiment, the first side receives the response of the peer end, which indicates that the first side device knows that the peer end has received the request and changed the modulation rate, and then may send an information frame with the changed modulation rate to the peer end.
And 5: and adjusting the rate according to the error rate, counting the uplink and downlink traffic when the error rate meets a first preset condition, generating the position of a command word corresponding to the optimal time slot ratio of the traffic information, and sending a third request frame for adjusting the optimal time slot ratio of the sending time slot, the receiving time slot, the lighting time slot and other time slots.
In one embodiment, the first peer determines the best slot fraction and informs the peer that a change is required.
Step 6: and after receiving a third response frame sent by the second side platform equipment, changing the self sending time slot, the receiving time slot, the lighting time slot and other time slot ratios, sending a data frame for establishing connection to the second side platform equipment, and establishing time division bidirectional transmission.
Through the above steps 1 to 5, the communication method for bidirectional data transmission according to the embodiment of the present invention implements flexible modulation format and rate of data transmission according to different channel characteristics of two communication devices, reasonably allocates the optimal timeslot ratio in the tdd mode, improves the data rate by improving the bandwidth utilization of the data packet, and implements tdd with multiple optical path functions.
An embodiment of the present invention further provides a communication method for bidirectional data transmission, as shown in fig. 6, where the communication method is executed by a second-side platform device, and the method includes:
step S1: and changing the modulation format of the self equipment according to the received first request frame, and transmitting a first response frame with the changed modulation format.
In a specific embodiment, the second side device receives the request that the first side device needs to change, and informs the peer that it has received and made a change.
Step S2: and establishing time division bidirectional communication of the modulation format at the first preset time according to the received information frame of which the modulation format is changed by the first side platform.
In a specific embodiment, the second-side device receives the information frame that the opposite end has changed, and then sends the information frame, so that the two parties establish communication.
Step S3: and changing the modulation rate of the self equipment according to the received second request frame, and sending a second response frame for changing the modulation rate.
Step S4: and establishing time division bidirectional communication of a new modulation rate at a second preset time according to the received information frame of which the modulation rate is changed by the first side platform.
Step S5: and changing the time slot ratio of the self device according to the received third request frame, and transmitting a third response frame for changing the transmission time slot, the receiving time slot, the lighting time slot and other time slot ratios.
Through the steps S1 to S5, the communication method for bidirectional data transmission according to the embodiment of the present invention implements flexible modulation format and rate of data transmission, reasonably allocates the optimal timeslot ratio in the tdd mode, improves the data rate by improving the bandwidth utilization of the data packet, and implements tdd with multiple optical paths according to different channel characteristics of the two communication devices.
An embodiment of the present invention further provides a communication apparatus for bidirectional data transmission, which is executed by a first side platform device, and as shown in fig. 7, the apparatus includes:
an optimal modulation format request unit 101, configured to receive an optical communication signal of a second-side platform device, generate a position of an optimal modulation format of a command word according to the optical communication signal, and send a first request frame corresponding to the optimal modulation format to the second-side platform device; see step 1 in the above examples for details.
A modulation format changing unit 102, configured to change a modulation format of the second side platform device after receiving the first response frame sent by the second side platform device, and send an information frame with the changed modulation format to the second side platform device; see step 2 in the above example for details.
An optimal modulation rate requesting unit 103, configured to generate a position of an optimal modulation rate of the command word according to the bit error rate of the first side platform device system, and send a second request frame corresponding to the optimal modulation rate to the second side platform device; see step 3 in the above example for details.
An optimal modulation rate changing unit 104, configured to change a modulation rate of the second side platform device after receiving the second response frame sent by the second side platform device, and send an information frame with the changed modulation rate to the second side platform device; see step 4 in the above examples for details.
An optimal timeslot proportion request unit 105, configured to adjust a rate according to the bit error rate, count uplink and downlink traffic when the bit error rate meets a first preset condition, generate a position of a command word corresponding to the optimal timeslot proportion of the traffic information, and send a third request frame for adjusting the optimal timeslot proportion of the transmission timeslot, the reception timeslot, the illumination timeslot, and other timeslots; see step 5 in the above example for details.
And an optimal timeslot proportion changing unit 106, configured to change the self transmission timeslot, the reception timeslot, the lighting timeslot, and other timeslot proportions after receiving the third response frame sent by the second side platform device, send a data frame for establishing a connection to the second side platform device, and establish time division bidirectional transmission. See step 6 in the above example for details.
Through the modules 101 to 106, the bidirectional transmission communication apparatus provided in the embodiment of the present invention, according to different channel characteristics of two communication devices, implements flexible modulation format and rate of data transmission, reasonably allocates an optimal timeslot ratio in a tdd mode, so that signal light, illumination light, and other light sources of the device respectively operate in their respective timeslots, and the light sources do not interfere with each other, thereby increasing data rate by increasing bandwidth utilization of a data packet, and implementing time division multiplexing with a multi-optical-path function.
An embodiment of the present invention further provides a communication apparatus for bidirectional data transmission, as shown in fig. 8, where the communication apparatus is executed by a second side platform device, and the apparatus includes:
an optimal modulation format request feedback unit 201, configured to change a modulation format of its own device according to the received first request frame, and send a first response frame with the changed modulation format; see step S1 in the above embodiment for details.
A modulation format communication establishing unit 202, configured to establish time division bidirectional communication of a modulation format at a first preset time according to a received information frame in which a first side platform changes the modulation format; see step S2 in the above embodiment for details.
An optimal modulation rate request feedback unit 203, configured to change the modulation rate of its own device according to the received second request frame, and send a second response frame for changing the modulation rate; see step S3 in the above embodiment for details.
A modulation rate communication establishing unit 204, configured to establish time division bidirectional communication at a new modulation rate at a second preset time according to the received information frame of which the modulation rate is changed by the first side platform; see step S4 in the above embodiment for details.
An optimal slot ratio request feedback unit 205, configured to change the transmission slot, the reception slot, the illumination slot, and other slot ratios of the self device according to the received third request frame, and transmit a third response frame with the changed slot ratio. See step S5 in the above embodiment for details.
Through the modules 201 to 205, the bidirectional transmission communication apparatus provided in the embodiment of the present invention, according to different channel characteristics of two communication devices, implements flexible modulation format and rate of data transmission, reasonably allocates an optimal timeslot ratio in a time division duplex mode, so that signal light, illumination light, and other light sources of the device respectively operate in their respective timeslots, and the light sources do not interfere with each other, thereby increasing data rate by increasing bandwidth utilization of a data packet, and implementing time division multiplexing with a multi-optical-path function.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A communication method for bidirectional data transmission, performed by a first side platform device, the method comprising:
receiving an optical communication signal of second-side platform equipment, generating the position of the optimal modulation format of a command word according to the optical communication signal, and sending a first request frame corresponding to the optimal modulation format to the second-side platform equipment;
after receiving a first response frame sent by the second side platform equipment, changing the modulation format of the second side platform equipment, and sending an information frame with the changed modulation format to the second side platform equipment;
generating the position of the optimal modulation rate of the command word according to the bit error rate of the first side platform equipment system, and sending a second request frame corresponding to the optimal modulation rate to the second side platform equipment;
after receiving a second response frame sent by the second side platform equipment, changing the modulation rate of the second side platform equipment, and sending an information frame of which the modulation rate is changed to the second side platform equipment;
adjusting the rate according to the error rate, counting the uplink and downlink traffic when the error rate meets a first preset condition, generating the position of a command word corresponding to the optimal time slot ratio of the traffic information, and sending a third request frame for adjusting the optimal time slot ratio of the sending time slot, the receiving time slot, the lighting time slot and other time slots;
and after receiving a third response frame sent by the second side platform equipment, changing the self sending time slot, the receiving time slot, the lighting time slot and other time slot ratios, sending a data frame for establishing connection to the second side platform equipment, and establishing time division bidirectional transmission.
2. The communication method for bidirectional data transmission according to claim 1, wherein the step of generating the position of the optimal modulation format of the command word according to the optical communication signal comprises:
averagely dividing the modulation format of the signal modulation format control module according to a first preset value;
the signal modulation format control module analyzes the optical communication signal by using a first preset algorithm and calculates a first preset coefficient;
and judging the threshold range of the first preset coefficient by using the first preset threshold to generate the position of the optimal modulation format of the command word, wherein each threshold range respectively corresponds to the optimal modulation format of the command word.
3. The communication method for bidirectional data transmission according to claim 1, wherein the step of generating the position of the optimal modulation rate of the command word according to the error rate of the first side platform device system comprises:
averagely dividing the signal rate of the signal rate control module according to a second preset value;
the signal rate control module analyzes the channel error rate by using a second preset algorithm and calculates a second preset coefficient;
and judging the threshold value range of the second preset coefficient by using a second preset threshold value, wherein each threshold value range corresponds to the optimal modulation rate of the command word, and when the error rate meets a second preset condition, generating the position of the optimal modulation rate of the command word.
4. The communication method for bidirectional data transmission according to claim 1, wherein the step of counting the uplink and downlink traffic and generating the position of the optimal time slot ratio of the command word comprises:
dividing the time slot ratio of the time slot control module traffic according to a third preset value;
the time slot control module analyzes the sending traffic and the receiving traffic of the first side platform equipment by using a third preset algorithm and calculates a third preset coefficient;
and judging the threshold range of a third preset coefficient by using a third preset threshold, and generating the position of the optimal time slot ratio of the command word, wherein each threshold range corresponds to the optimal time slot ratio of the command word respectively.
5. A communication method for bidirectional data transmission, performed by a second side platform device, the method comprising:
changing the modulation format of the self equipment according to the received first request frame, and sending a first response frame with the changed modulation format;
according to the received information frame of which the modulation format is changed by the first side platform, establishing time division bidirectional communication of the modulation format at first preset time;
changing the modulation rate of the self equipment according to the received second request frame, and sending a second response frame for changing the modulation rate;
according to the received information frame of which the modulation rate is changed by the first side platform, establishing time division bidirectional communication of a new modulation rate at a second preset time;
and changing the time slot ratio of the self device according to the received third request frame, and transmitting a third response frame for changing the transmission time slot, the receiving time slot, the lighting time slot and other time slot ratios.
6. The communication method for the bidirectional data transmission according to any one of claims 1 to 5, wherein the communication method for the bidirectional data transmission is used for underwater wireless optical communication and other space wireless optical communication.
7. A communication apparatus for bidirectional data transmission, performed by a first side platform device, the apparatus comprising:
the optimal modulation format request unit is used for receiving an optical communication signal of the second-side platform equipment, generating the position of the optimal modulation format of the command word according to the optical communication signal, and sending a first request frame corresponding to the optimal modulation format to the second-side platform equipment;
the modulation format changing unit is used for changing the modulation format of the modulation format after receiving the first response frame sent by the second-side platform equipment and sending the information frame with the changed modulation format to the second-side platform equipment;
the optimal modulation rate request unit is used for generating the position of the optimal modulation rate of the command word according to the error rate of the first side platform equipment system and sending a second request frame corresponding to the optimal modulation rate to the second side platform equipment;
the optimal modulation rate changing unit is used for changing the modulation rate of the optimal modulation rate after receiving a second response frame sent by the second side platform equipment and sending an information frame with the changed modulation rate to the second side platform equipment;
the optimal time slot ratio request unit is used for adjusting the rate according to the error rate, counting the uplink and downlink traffic when the error rate meets a first preset condition, generating the position of a command word corresponding to the optimal time slot ratio of the traffic information, and sending a third request frame for adjusting the optimal time slot ratio of the sending time slot, the receiving time slot, the lighting time slot and other time slots;
and the optimal time slot ratio changing unit is used for changing the self sending time slot, the receiving time slot, the lighting time slot and other time slot ratios after receiving the third response frame sent by the second side platform equipment, sending a data frame for establishing connection to the second side platform equipment, and establishing time division bidirectional transmission.
8. A communication apparatus for bidirectional data transmission, performed by a second side platform device, the apparatus comprising:
the optimal modulation format request feedback unit is used for changing the modulation format of the self equipment according to the received first request frame and sending a first response frame for changing the modulation format;
the modulation format communication establishing unit is used for establishing time division bidirectional communication of the modulation format at first preset time according to the received information frame of which the first side platform changes the modulation format;
an optimal modulation rate request feedback unit, configured to change the modulation rate of the device itself according to the received second request frame, and send a second response frame that changes the modulation rate;
the modulation rate communication establishing unit is used for establishing time division bidirectional communication of a new modulation rate at a second preset time according to the received information frame of which the modulation rate is changed by the first side platform;
and the optimal time slot ratio request feedback unit is used for changing the transmitting time slot, the receiving time slot, the lighting time slot and other time slot ratios of the self equipment according to the received third request frame and transmitting a third response frame with the changed time slot ratio.
9. The communication device for data bidirectional transmission according to claim 7 or 8, wherein the communication device for data bidirectional transmission is used for underwater blue-green laser communication.
10. A communication system for bi-directional data transmission, comprising: a first side stage apparatus and a second side stage apparatus,
the first side platform equipment receives an optical communication signal of the second side platform equipment, generates the position of the optimal modulation format of the command word according to the optical communication signal, sends a first request frame corresponding to the optimal modulation format to the second side platform equipment, and the second side platform equipment changes the modulation format of the equipment according to the received first request frame and sends a first response frame for changing the modulation format;
the first side platform equipment changes the modulation format of the first side platform equipment after receiving a first response frame sent by the second side platform equipment and sends an information frame with the changed modulation format to the second side platform equipment, and the second side platform equipment establishes time division bidirectional communication of the modulation format at first preset time according to the received information frame with the changed modulation format of the first side platform equipment;
the first side platform equipment generates the position of the optimal modulation rate of the command word according to the bit error rate of a first side platform equipment system, and sends a second request frame corresponding to the optimal modulation rate to second side platform equipment, and the second side platform equipment changes the modulation rate of the equipment per se according to the received second request frame and sends a second response frame for changing the modulation rate;
the first side platform equipment changes the self modulation rate after receiving a second response frame sent by the second side platform equipment, and sends an information frame with the changed modulation rate to the second side platform equipment, and the second side platform equipment establishes time division bidirectional communication of a new modulation rate at second preset time according to the received information frame with the changed modulation rate of the first side platform equipment;
the first side platform equipment adjusts the rate according to the error rate, when the error rate meets a first preset condition, the first side platform equipment counts uplink and downlink traffic, generates the position of a command word corresponding to the optimal time slot proportion of traffic information, and sends a third request frame for adjusting the optimal time slot proportion of a sending time slot, a receiving time slot, an illuminating time slot and other time slots, and the second side platform equipment changes the sending time slot, the receiving time slot, the illuminating time slot and other time slot proportions of the equipment according to the received third request frame and sends a third response frame for changing the time slot proportion;
and after receiving the third response frame sent by the second side platform equipment, the first side platform equipment changes the self sending time slot, the receiving time slot, the lighting time slot and other time slot ratios, sends a data frame for establishing connection to the second side platform equipment, and establishes time division bidirectional transmission.
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