CN115694727A - Long interleaving method and equipment for satellite-ground laser communication data - Google Patents
Long interleaving method and equipment for satellite-ground laser communication data Download PDFInfo
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Abstract
The invention discloses a long interleaving method and equipment for satellite-ground laser communication data, which are used for carrying out channel coding on the satellite-ground laser communication data and dividing the data subjected to the channel coding into a plurality of data sections with the same length; dividing each data segment into a plurality of data blocks with the same length; sequentially carrying out internal interleaving on the data blocks, and obtaining a plurality of internal interleaving blocks after the internal interleaving; the outer interleaving is carried out on the inner interleaving blocks, the data after the outer interleaving is used as the data after the communication data is subjected to long interleaving, and a two-stage interleaving technology is used, so that the deep fading resistance of data transmission is effectively improved; the signal reliability and stability under the condition of extremely low signal-to-noise ratio receiving under the influence of atmospheric turbulence are greatly improved; meanwhile, aiming at the influence of deep fading of atmospheric turbulence on satellite-ground laser communication, a two-stage interleaving mode is used in long interleaving, and the burst resistance of high-speed data transmission is greatly improved.
Description
Technical Field
The present application relates to the field of satellite-to-ground laser communication technologies, and in particular, to a long interleaving method and device for satellite-to-ground laser communication data.
Background
With the rapid development of remote sensing technology, the number of satellite load platforms is increasing, and the development of high-resolution cameras, synthetic aperture radars and other technologies, the amount of data generated by the satellite load platforms increases in a geometric scale, so that the demand for high-speed satellite-ground data transmission is increasingly urgent. At present, traditional satellite-ground data transmission based on microwave is limited by frequency band bandwidth and the limitations of power consumption, size, weight, heat dissipation and the like of a data transmission terminal, and the high-speed downloading requirement of mass data is difficult to meet no matter a microwave frequency band with higher frequency such as ka or modulation technologies such as high-order modulation and VCM are adopted. In addition, due to the problems of more uncertain factors in the international form, difficult return of overseas data and the like, the data transmission requirement of satellite data is difficult to meet through the construction of an off-border station in a short term. Therefore, the demand of satellite for high-speed data transmission is increasingly contradicted with the satellite-ground data transmission capability of the existing system. The satellite-ground laser communication can break through a plurality of problems of microwave data transmission, has the advantages of large available bandwidth, high cost efficiency, small platform load, good confidentiality and the like, more and more satellites select laser communication to carry out satellite-ground high-speed data transmission, and the satellite-ground laser communication is expected to be an important way for satellite-ground high-speed data transmission in the future.
In satellite-to-ground laser communications, the non-uniform atmosphere of the near-surface region is an important component of the laser communications channel. The transmission of laser light in the atmosphere is inevitably affected by the atmosphere, and the influence mainly includes attenuation effect and turbulent flow effect. When the laser is transmitted in the atmosphere, the laser can interact with particles such as atmospheric molecules, aerosol, water vapor and the like, the interaction can directly cause the wavefront distortion of the light, and the received light power fluctuates and attenuates, so that the performance of a communication system is deteriorated. The turbulence effects of the atmosphere can cause beam drift, beam expansion, and light intensity flicker. The atmosphere is dynamically changed in real time, which causes random fluctuation of the atmosphere refractive index, and the turbulence effect further changes the random change of the light field of the light beam, and macroscopically shows that the light field is degraded in spatial coherence, fluctuated in light beam drift and fluctuated in arrival angle; the absorption and scattering effects of aerosol in an atmospheric channel on laser transmission and the intensity flicker of signal light caused by atmospheric turbulence can seriously reduce the power of the signal light, so that the light beam quality of the signal light at a receiving end is poor, and the signal-to-noise ratio of the received signal is reduced, thereby reducing the communication performance of a satellite-ground laser communication system and the reliability of a communication link. Except extreme weather conditions such as rain, cloud, fog, atmospheric turbulence, atmospheric scattering and atmospheric absorption under the better weather conditions all can cause the influence to the laser beam quality of satellite-to-ground to influence satellite-to-ground laser communication.
In a satellite-to-ground laser link, the influence of atmospheric turbulence is particularly remarkable, and a channel coding mode is adopted to improve the burst Error resistance of data transmission, for example, the channel coding mode using a Forward Error Correction function (Forward Error Correction) suggests that LDPC (Low-density Parity-check) is adopted. However, during communication, the deep fading time caused by atmospheric turbulence is long (tens of milliseconds), which is a devastating impact on the quality of high-speed laser communication (the satellite-ground laser communication speed can easily reach several Gbps). Under the influence of atmospheric turbulence, burst errors generated by data transmission are often large-chip-to-large-chip, the traditional interleaving scheme is too short to meet the requirement of high speed of satellite-to-ground laser communication, and meanwhile, the problems of too high time delay and engineering realization cannot be solved by adopting the traditional interleaving method.
Therefore, how to effectively improve the reliability of the satellite-ground laser communication while ensuring the high speed of the satellite-ground laser communication is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a long interleaving method of satellite-ground laser communication data, which is used for solving the problems that the traditional interleaving scheme in the prior art is too short to meet the requirement of high speed of satellite-ground laser communication, and the traditional interleaving method cannot be used for processing the problems of too high time delay and engineering realization, and comprises the following steps:
carrying out channel coding on satellite-ground laser communication data, and dividing the data subjected to channel coding into a plurality of data sections with the same length;
dividing each data segment into a plurality of data blocks with the same length;
sequentially carrying out internal interleaving on the data blocks, and obtaining a plurality of internal interleaving blocks after the internal interleaving;
and performing outer interleaving on the plurality of inner interleaving blocks, and using the data subjected to outer interleaving as the data subjected to long interleaving on the communication data.
In some embodiments of the present application, the type of the inner interleaving is specifically matrix interleaving, the data blocks are sequentially inner interleaved, and a plurality of inner interleaving blocks after inner interleaving are obtained, specifically:
and writing the data blocks into a preset two-dimensional matrix memory from left to right in rows, wherein the writing sequence of the same row of the two-dimensional matrix memory is from top to bottom.
In some embodiments of the present application, in the time of inner interleaving output, data in the two-dimensional matrix memory is sequentially read from top to bottom in rows.
In some embodiments of the present application, the type of the outer interleaving is specifically convolutional interleaving, and the outer interleaving is performed on the plurality of inner interleaving blocks, specifically:
and sequentially reading the internally interleaved data from the two-dimensional matrix memory, sequentially writing the internally interleaved data into a plurality of branches under the control of a selector switch, and sequentially taking out the externally interleaved data from the plurality of branches under the control of the selector switch, wherein the number of the branches is determined by the interleaving width, and the number of the delay buffers of each branch is sequentially increased according to the integral multiple of the unit interleaving depth.
In some embodiments of the present application, a distance between any two data having a spacing smaller than B × M before interleaving is greater than or equal to B and smaller than or equal to B × M after interleaving;
wherein B is the interleaving width, and M is the unit interleaving depth.
Correspondingly, the invention also provides long interleaving equipment for satellite-ground laser communication data, which comprises the following steps:
the encoding module is used for carrying out channel encoding on the satellite-ground laser communication data and dividing the data subjected to the channel encoding into a plurality of data sections with the same length;
the dividing module is used for dividing each data segment into a plurality of data blocks with the same length;
the inner interleaving module is used for sequentially carrying out inner interleaving on the data blocks and obtaining a plurality of inner interleaving blocks after the inner interleaving;
and the outer interleaving module is used for performing outer interleaving on the inner interleaving blocks and taking the data subjected to the outer interleaving as the data subjected to the long interleaving on the communication data.
In some embodiments of the present application, the type of the inner interleaving is specifically matrix interleaving, and the inner interleaving module is specifically configured to:
and writing the data blocks into a preset two-dimensional matrix memory from left to right in rows, wherein the writing sequence of the same row of the two-dimensional matrix memory is from top to bottom.
In some embodiments of the present application, in the time of inner interleaving output, data in the two-dimensional matrix memory is sequentially read from top to bottom in rows.
In some embodiments of the present application, the type of the outer interleaving is specifically convolutional interleaving, and the outer interleaving module is specifically configured to:
sequentially reading the internally interleaved data from the two-dimensional matrix memory, sequentially writing the internally interleaved data into a plurality of branches under the control of a selector switch, and sequentially taking out the externally interleaved data from the plurality of branches under the control of the selector switch, wherein the number of the branches is determined by the interleaving width, and the number of the delay buffers of each branch is sequentially increased according to the integral multiple of the unit interleaving depth.
In some embodiments of the present application, a distance between any two data having a spacing smaller than B × M before interleaving is greater than or equal to B and smaller than or equal to B × M after interleaving;
wherein B is the interleaving width and M is the unit interleaving depth.
By applying the technical scheme, channel coding is carried out on satellite-ground laser communication data, and the data subjected to channel coding is divided into a plurality of data sections with the same length; dividing each data segment into a plurality of data blocks with the same length; sequentially carrying out inner interleaving on the data blocks, and obtaining a plurality of inner interleaving blocks after the inner interleaving; the outer interleaving is carried out on the inner interleaving blocks, the data after the outer interleaving is used as the data after the communication data is subjected to long interleaving, and a two-stage interleaving technology is used, so that the deep fading resistance of data transmission is effectively improved; the inner interleaving uses rectangular interleaving, the structure is simple, the engineering realization difficulty is low, and the data blocks are interleaved, so that the high speed of laser communication is reserved, and the time delay influence caused by the rectangular interleaving is overcome to a certain extent; the outer interweaving uses convolution interweaving, the time delay and the storage capacity of the convolution interweaving are less, the time delay and the resources are reduced while the interweaving performance is guaranteed, the practicability of a long interweaving technology in engineering is greatly improved, meanwhile, the long interweaving technology is used, the interweaving depth is tens of thousands to millions of bits, and the signal reliability and the stability under the condition of extremely low signal to noise ratio receiving under the influence of atmospheric turbulence are greatly improved; meanwhile, aiming at the influence of deep fading of atmospheric turbulence on satellite-ground laser communication, a two-stage interleaving mode is used in long interleaving, and the burst resistance of high-speed data transmission is greatly improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a long interleaving method for satellite-ground laser communication data according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a long interleaving method according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating an inner interleaving proposed by an embodiment of the present invention;
FIG. 4 shows a schematic diagram of an outer weave proposed by an embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a long interleaving device for satellite-ground laser communication data according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all 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 application.
The invention uses two-stage interleaving technology, thus effectively improving the deep fading resistance of data transmission; the inner interleaving uses rectangular interleaving, the structure is simple, the engineering realization difficulty is low, and the data blocks are interleaved, so that the high speed of laser communication is reserved, and the time delay influence caused by the rectangular interleaving is overcome to a certain extent; the outer interleaving uses convolution interleaving, the time delay and the storage capacity of the convolution interleaving are less, the time delay and the resources are reduced while the interleaving performance is ensured, and the practicability of the long interleaving technology in engineering is greatly improved.
Meanwhile, the invention uses long interleaving technology, the interleaving depth is tens of thousands to millions of bits, and the signal reliability and stability under the condition of extremely low signal-to-noise ratio receiving under the influence of atmospheric turbulence are greatly improved; meanwhile, aiming at the influence of deep fading of atmospheric turbulence on satellite-ground laser communication, a two-stage interleaving mode is used in long interleaving, and the burst resistance of high-speed data transmission is greatly improved.
As shown in fig. 1, the method comprises the steps of:
step S101, channel coding is carried out on the satellite-ground laser communication data, and the data subjected to channel coding is divided into a plurality of data segments with the same length.
In this embodiment, as shown in fig. 2, mainly performing long interleaving operation on satellite-ground laser communication data, performing channel coding on the satellite-ground laser communication data, and dividing the data subjected to channel coding into a plurality of data segments with the same length, for example, using a Forward Error Correction (Forward Error Correction) channel coding, it is proposed to adopt LDPC coding (Low-density Parity-check).
It should be understood that the LDPC coding is only a preferred coding method proposed in the present application, and is not limited to the channel coding specifically, and those skilled in the art can flexibly adjust the coding method according to actual situations, and other channel coding methods for improving the burst error resistance of data transmission all belong to the protection scope of the present application.
Step S102, dividing each data segment into a plurality of data blocks with the same length.
In this embodiment, as shown in fig. 2, after LDPC encoding is performed on data, the encoded data is segmented, and the data segment is further divided into data blocks with the same length, so as to facilitate subsequent inner interleaving operations.
It can be understood that the present application focuses on the idea of dividing encoded data into data blocks and performing subsequent interleaving operation on the data blocks, and the specific process of data division is not further limited, and the methods of dividing encoded data into data blocks and performing subsequent interleaving operation on the data blocks based on the above idea all belong to the protection scope of the present application, and the lengths of the corresponding data segments and the data blocks are not limited herein, and those skilled in the art can flexibly select different lengths to meet the actual production requirements.
And step S103, sequentially carrying out inner interleaving on the data blocks and obtaining a plurality of inner interleaving blocks after the inner interleaving.
In this embodiment, a long interleaving method with two levels of interleaving is mainly used to solve the problems that the conventional interleaving scheme is too short to meet the requirement of high speed of satellite-to-ground laser communication, and the conventional interleaving method cannot handle the problems of too high delay and engineering implementation.
In order to implement inner interleaving on a data block, in some embodiments of the present application, a type of the inner interleaving is specifically matrix interleaving, the data block is sequentially inner interleaved, and a plurality of inner interleaving blocks after inner interleaving are obtained, specifically:
and writing the data blocks into a preset two-dimensional matrix memory from left to right in rows, wherein the writing sequence of the same row of the two-dimensional matrix memory is from top to bottom.
In this embodiment, the inner interleaving is taken as matrix interleaving as an example, when data in a data block is written, the writing sequence is specifically that the data is written into the two-dimensional matrix memory in rows, and after the data is written into the first row from top to bottom, the data is written into the second row from top to bottom until all the data is written into the two-dimensional matrix memory, that is, the inner interleaving operation is completed.
Optionally, the interleaving granularity of the inner interleaving may be 1bit, 8bit, 16bit, 32bit, or the like.
In order to ensure the normal output of the inner interleaving, in some embodiments of the present application, the data in the two-dimensional matrix memory is sequentially read from top to bottom in rows.
Specifically, as shown in fig. 3, when reading the inner interleaved data, the inner interleaved data is read in rows, and the inner interleaved data is read from top to bottom until the data of the tail block of the interleaved data is completely read.
And step S104, performing outer interleaving on the plurality of inner interleaving blocks, and using the data after the outer interleaving as the data after the long interleaving on the communication data.
In this embodiment, an outer interleaving operation is performed on the inner interleaved block after inner interleaving, and the data after outer interleaving is communication data after long interleaving.
In order to implement an outer interleaving operation on inner interleaving blocks, in some embodiments of the present application, a type of the outer interleaving is specifically convolutional interleaving, and the outer interleaving is performed on a plurality of inner interleaving blocks, specifically:
and sequentially reading the internally interleaved data from the two-dimensional matrix memory, sequentially writing the internally interleaved data into a plurality of branches under the control of a selector switch, and sequentially taking out the externally interleaved data from the plurality of branches under the control of the selector switch, wherein the number of the branches is determined by the interleaving width, and the number of the delay buffers of each branch is sequentially increased according to the integral multiple of the unit interleaving depth.
In the embodiment of the present application, as shown in fig. 4, taking convolutional interleaving as an example, data after inner interleaving sequentially enters B branches under the action of a switch, where B is an interleaving width (number of branches), the number of delay buffers of each branch sequentially increases by an integral multiple of M, M is a unit interleaving depth (size of unit delay buffer), and an outer interleaving output end takes out data from B branches in turn by using a synchronous switch.
In order to ensure the transmission rate of the satellite-to-ground laser communication, in some embodiments of the present application, the distance between two data with any spacing smaller than B × M before interleaving is greater than or equal to B and smaller than or equal to B × M after interleaving;
wherein B is the interleaving width and M is the unit interleaving depth.
By applying the technical scheme, channel coding is carried out on satellite-ground laser communication data, and the data subjected to channel coding is divided into a plurality of data sections with the same length; dividing each data segment into a plurality of data blocks with the same length; sequentially carrying out inner interleaving on the data blocks, and obtaining a plurality of inner interleaving blocks after the inner interleaving; the outer interleaving is carried out on the plurality of inner interleaving blocks, the data after the outer interleaving is used as the data after the communication data is subjected to long interleaving, and a two-stage interleaving technology is used, so that the deep fading resistance of data transmission is effectively improved; the inner interleaving uses rectangular interleaving, the structure is simple, the engineering realization difficulty is low, and the data blocks are interleaved, so that the high speed of laser communication is reserved, and the time delay influence caused by the rectangular interleaving is overcome to a certain extent; the outer interweaving uses convolution interweaving, the time delay and the storage capacity of the convolution interweaving are less, the time delay and the resources are reduced while the interweaving performance is guaranteed, the practicability of a long interweaving technology in engineering is greatly improved, meanwhile, the long interweaving technology is used, the interweaving depth is tens of thousands to millions of bits, and the signal reliability and the stability under the condition of extremely low signal to noise ratio receiving under the influence of atmospheric turbulence are greatly improved; meanwhile, aiming at the influence of deep fading of atmospheric turbulence on satellite-ground laser communication, a two-stage interleaving mode is used in long interleaving, and the burst resistance of high-speed data transmission is greatly improved.
To further illustrate the technical idea of the present invention, the present solution will now be further described with reference to the specific examples and fig. 2-4.
As shown in fig. 2, the main processes of the present invention are: data with data length Ndata Bits is firstly subjected to channel coding (LDPC coding), the data is segmented, the length of each segment is Nouter bit, then the data segment is divided into I blocks, the length of each block of data is Ninter bit, and the requirement of the mathematical relation Nouter = Ninter I is met. And then sequentially carrying out inner interleaving and interweaving on the data blocks with the length of Ninter to obtain I inner interleaving blocks, and finally carrying out outer interleaving on the I inner interleaving blocks. Namely, the long interleaving method of the satellite-ground laser communication data uses two-stage interleaving: inner interleaving and outer interleaving, wherein data is firstly subjected to inner interleaving and then to outer interleaving.
Because the satellite-ground laser communication speed is high, in order to adapt to the satellite-ground laser communication transmission channel environment, improve the Data transmission reliability and resist the influence of atmospheric turbulence on communication, the invention uses long interleaving, the interleaving depth (namely the Data segment length Nouter) is designed into tens of thousands to millions of bits, and the design of such large throughput is difficult to realize by using FPGA (Field Programmable Gate Array), so the invention uses DDR (Double Data Rate Synchronous Dynamic Random Access Memory) to realize long interleaving.
In order to ensure the transmission rate of laser communication, matrix interleaving is adopted for inner interleaving, the interleaving granularity Minter can be selected to be 1bit, 8bit, 16bit, 32bit and the like, and the processing flow of inner interleaving is shown in fig. 3 as follows. Firstly, data with the length of Ninter are written into a two-dimensional rectangular memory in sequence according to columns, minter bits are written into each address of the memory, the depth of the two-dimensional rectangular memory is m, the width of the two-dimensional rectangular memory is n, and the requirement that the Ninter = Minter m n is met. When the inner interweaving is output, the inner interweaving is output according to the rows, n × Minter of the 1 st row is output, and then the 2 nd row to the m th row are output sequentially.
Because the satellite-to-ground laser communication is affected by the deep fading of the atmospheric turbulence (the deep fading time is several milliseconds), the data cannot be scattered to an ideal required level only by using the internal interleaving shown in fig. 3, the data error correction capability cannot be ensured within the range, and the deep fading effect of the atmospheric turbulence is hard to resist, so that the data is subjected to external interleaving on the basis of the internal interleaving.
In order to ensure the practicability of engineering, while reducing communication delay and saving hardware resources, data is scattered to an ideal degree, the outer interleaving performs convolution interleaving on the I inner interleaving blocks, the unit interleaving depth M can be selected to be 4096 bits, 8192 bits, 10240 bits and the like, and the processing flow of the outer interleaving is shown in fig. 4 below. Firstly, data after inner interleaving sequentially enters B branches under the action of a selector switch, B is an interleaving width (number of branches), the number of delay buffers of each branch sequentially increases by integral multiple of M, M is a unit interleaving depth (size of unit delay buffer), and an outer interleaving output end alternately takes out the data from the B branches by using a synchronous selector switch.
And after any two data with the spacing smaller than B × M before interleaving are interleaved, the distance is minimum equal to B and maximum equal to B × M. In fig. 4, small squares indicate delayed data having a duration D, vertical indicates the number of convolutional interleave taps (taps) as m, and horizontal indicates the data storage intervals (storage intervals) as n. The nth tap has n delays D to form a lower triangular matrix, so that the maximum tap delay T = n × D of outer interweaving meets the requirement of high speed of satellite-ground laser communication, and the problems of overhigh delay and difficult engineering realization are solved.
It should be noted that, in application scenarios such as satellite-to-ground laser communication and microwave high-speed data transmission under different complex conditions, the internal and external interleaving method and the different long interleaving methods formed by dividing different data blocks in the present invention should fall within the protection scope of the present invention. For example: the two-stage interleaving adopts rectangular interleaving, the two-stage interleaving adopts convolutional interleaving, the interleaving methods include two methods which are not limited in the invention, the corresponding interleaving method is used according to actual requirements, and from the aspects of universality and practicability, the proposal that the rectangular interleaving is used for inner interleaving, and the convolutional interleaving is used for outer interleaving is provided.
The embodiment of the present application further provides a long interleaving device for satellite-ground laser communication data, as shown in fig. 5, the device includes:
the encoding module 10 is configured to perform channel encoding on satellite-ground laser communication data, and divide the data subjected to channel encoding into a plurality of data segments with the same length;
a dividing module 20, configured to divide each of the data segments into a plurality of data blocks with the same length;
an inner interleaving module 30, configured to perform inner interleaving on the data blocks in sequence, and obtain a plurality of inner interleaved blocks after the inner interleaving;
and an outer interleaving module 40, configured to perform outer interleaving on the multiple inner interleaving blocks, and use data after the outer interleaving as data after long interleaving of the communication data.
In a specific application scenario, the type of the inner interleaving is specifically matrix interleaving, and the inner interleaving module is specifically configured to:
and writing the data blocks into a preset two-dimensional matrix memory from left to right in rows, wherein the writing sequence of the same row of the two-dimensional matrix memory is from top to bottom.
In a specific application scenario, when performing inner-interleave output, data in the two-dimensional matrix memory is sequentially read from top to bottom in rows.
In a specific application scenario, the type of the outer interleaving is specifically convolutional interleaving, and the outer interleaving module is specifically configured to:
sequentially reading the internally interleaved data from the two-dimensional matrix memory, sequentially writing the internally interleaved data into a plurality of branches under the control of a selector switch, and sequentially taking out the externally interleaved data from the plurality of branches under the control of the selector switch, wherein the number of the branches is determined by the interleaving width, and the number of the delay buffers of each branch is sequentially increased according to the integral multiple of the unit interleaving depth.
In a specific application scenario, the distance between any two pieces of data with a distance smaller than B × M before interleaving is greater than or equal to B and smaller than or equal to B × M after interleaving;
wherein B is the interleaving width and M is the unit interleaving depth.
In conclusion, the beneficial effects of the invention are further explained:
the applicability is strong. The long interleaving method is not only suitable for the satellite-ground laser communication link, but also suitable for the microwave high-speed data transmission communication link under different complex conditions.
The practicability is strong. The invention uses two-stage interleaving technology, thus effectively improving the deep fading resistance of data transmission; the inner interleaving uses rectangular interleaving, the structure is simple, the engineering realization difficulty is low, and the data blocks are interleaved, so that the high speed of laser communication is reserved, and the time delay influence caused by the rectangular interleaving is overcome to a certain extent; the outer interweaving uses convolution interweaving, the time delay and the storage capacity of the convolution interweaving are less, the time delay and the resources are saved while the interweaving performance is guaranteed, and the practicability of the long interweaving technology in engineering is greatly improved.
The reliability is high. The invention uses long interleaving technology, the interleaving depth is tens of thousands to millions of bits, and the signal reliability and stability under the condition of extremely low signal-to-noise ratio receiving under the influence of atmospheric turbulence are greatly improved; meanwhile, aiming at the influence of deep fading of atmospheric turbulence on satellite-ground laser communication, a two-stage interleaving mode is used in long interleaving, and the burst resistance of high-speed data transmission is greatly improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method for long interleaving of satellite-to-ground laser communication data, the method comprising:
carrying out channel coding on satellite-ground laser communication data, and dividing the data subjected to channel coding into a plurality of data sections with the same length;
dividing each data segment into a plurality of data blocks with the same length;
sequentially carrying out internal interleaving on the data blocks, and obtaining a plurality of internal interleaving blocks after the internal interleaving;
and performing outer interleaving on the plurality of inner interleaving blocks, and using the data subjected to outer interleaving as the data subjected to long interleaving on the communication data.
2. The method according to claim 1, wherein the type of the inner interleaving is specifically matrix interleaving, the data blocks are sequentially inner interleaved, and a plurality of inner interleaving blocks after inner interleaving are obtained, specifically:
and writing the data blocks into a preset two-dimensional matrix memory from left to right in rows, wherein the writing sequence of the same row of the two-dimensional matrix memory is from top to bottom.
3. The method of claim 2, wherein the data in the two-dimensional matrix memory is read sequentially from top to bottom in rows at the time of the inner interleaved output.
4. The method according to claim 3, wherein the type of outer interleaving is specifically convolutional interleaving, and the outer interleaving is performed on the plurality of inner interleaving blocks, specifically:
and sequentially reading the internally interleaved data from the two-dimensional matrix memory, sequentially writing the internally interleaved data into a plurality of branches under the control of a selector switch, and sequentially taking out the externally interleaved data from the plurality of branches under the control of the selector switch, wherein the number of the branches is determined by the interleaving width, and the number of the delay buffers of each branch is sequentially increased according to the integral multiple of the unit interleaving depth.
5. The method of claim 1, wherein the distance between any two data spaced less than Bx M before interleaving is greater than or equal to B and less than or equal to Bx M after interleaving;
wherein B is the interleaving width and M is the unit interleaving depth.
6. An apparatus for long interleaving of satellite-to-ground laser communication data, the apparatus comprising:
the encoding module is used for carrying out channel encoding on the satellite-ground laser communication data and dividing the data subjected to channel encoding into a plurality of data sections with the same length;
the dividing module is used for dividing each data segment into a plurality of data blocks with the same length;
the inner interleaving module is used for sequentially carrying out inner interleaving on the data blocks and obtaining a plurality of inner interleaving blocks after the inner interleaving;
and the outer interleaving module is used for performing outer interleaving on the inner interleaving blocks and taking the data subjected to the outer interleaving as the data subjected to the long interleaving on the communication data.
7. The device of claim 6, wherein the type of inner interleaving is in particular matrix interleaving, and wherein the inner interleaving module is in particular configured to:
and writing the data blocks into a preset two-dimensional matrix memory from left to right in rows, wherein the writing sequence of the same row of the two-dimensional matrix memory is from top to bottom.
8. The apparatus of claim 7, wherein data in the two-dimensional matrix memory is read sequentially from top to bottom in rows at the time of the inner interleaved output.
9. The device of claim 8, wherein the type of outer interleaving is specifically convolutional interleaving, and wherein the outer interleaving module is specifically configured to:
and sequentially reading the internally interleaved data from the two-dimensional matrix memory, sequentially writing the internally interleaved data into a plurality of branches under the control of a selector switch, and sequentially taking out the externally interleaved data from the plurality of branches under the control of the selector switch, wherein the number of the branches is determined by the interleaving width, and the number of the delay buffers of each branch is sequentially increased according to the integral multiple of the unit interleaving depth.
10. The apparatus of claim 8, wherein a distance after interleaving of any two data with a spacing less than B x M before interleaving is greater than or equal to B and less than or equal to B x M;
wherein B is the interleaving width, and M is the unit interleaving depth.
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