CN111669215A - Multi-subcarrier dynamic frequency resource allocation technology for satellite uplink communication link - Google Patents
Multi-subcarrier dynamic frequency resource allocation technology for satellite uplink communication link Download PDFInfo
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a multi-subcarrier dynamic frequency resource allocation method for a satellite uplink communication link, which classifies users to allocate different subcarriers for different users; then, on the basis of adopting a modulation mode of multiple subcarriers, the subcarriers are initially distributed according to different users to ensure that the user distribution on the subcarriers is relatively uniform, so that the signal quality is ensured, the capacity of a multi-subcarrier dynamic frequency resource distribution system is improved, and meanwhile, the multi-subcarrier dynamic frequency resource distribution system effectively meets the communication requirements of high-speed data transmission users and basic communication users; and finally, according to the user communication request, the current frequency utilization condition, the channel state and the initial subcarrier allocation, dynamic frequency resource allocation is carried out, so that the accuracy and the real-time performance of frequency allocation can be effectively realized, the communication quality of authorized users is ensured, the compatibility of various service signal types is realized, and the whole user capacity of the multi-subcarrier dynamic frequency resource allocation system is improved.
Description
Technical Field
The invention relates to the technical field of satellite communication signal modulation system design, signal spectrum design and frequency resource allocation, in particular to a multi-subcarrier dynamic frequency resource allocation method and a multi-subcarrier dynamic frequency resource allocation system for a satellite uplink communication link.
Background
The multi-user random access bidirectional satellite communication system mainly comprises a user terminal, a satellite and a ground central processing station, wherein a communication signal sent by the terminal is forwarded to the ground central processing station through the satellite, the central processing station demodulates the signal and manages the user, and specific management information is broadcasted to the user. The transmission of information from the user to the central processing station is called uplink and the transmission of information from the central processing station to the user is called downlink. The satellite communication system has limited bandwidth, signals are overlapped on a time domain and a frequency domain under the condition of multi-user random access, so that the equivalent carrier-to-noise ratio of effective signals is reduced due to multi-access interference between the signals, and the user capacity of the system is greatly dependent on the influence of the multi-access interference.
In the current multi-user random access satellite communication, a terminal mostly adopts a fixed signal modulation system and a fixed frequency allocation strategy, the strategy is simple to realize, and the construction cost of the terminal and a central processing station is lower. However, the user management mode is simple, which easily causes the over-high occupancy rate of partial bandwidth in the bandwidth to affect the signal quality, and the over-low occupancy rate of partial bandwidth to cause the resource waste; in addition, the same design is adopted in the user service, so that diversified requirements cannot be met.
Disclosure of Invention
The invention provides a multi-subcarrier dynamic frequency resource allocation method and a multi-subcarrier dynamic frequency resource allocation system for a satellite uplink communication link, which are used for overcoming the defects that in the prior art, the signal quality is poor due to simple user management mode, diversified requirements cannot be met due to the adoption of the same design and the like.
In order to achieve the above object, the present invention provides a multi-subcarrier dynamic frequency resource allocation method for a satellite uplink communication link, including:
dividing users into high-speed data transmission users and basic communication users according to the historical communication conditions of the users; the communication signal of the high-speed data transmission user is a high-speed data transmission signal, and the communication signal of the basic communication user is a basic communication signal;
carrying out multi-subcarrier modulation on the communication signal, and carrying out subcarrier initial allocation according to the high-speed data transmission user and the basic communication user;
and according to the user communication request, the current subcarrier utilization condition, the channel state and the information of the initial subcarrier allocation, performing dynamic frequency resource allocation.
To achieve the above object, the present invention further provides a multi-subcarrier dynamic frequency resource allocation system for a satellite uplink communication link, including:
the user classification module is used for classifying users into high-speed data transmission users and basic communication users according to the historical communication conditions of the users; the communication signal of the high-speed data transmission user is a high-speed data transmission signal, and the communication signal of the basic communication user is a basic communication signal;
a subcarrier initial allocation module, configured to perform multi-subcarrier modulation on the communication signal, and perform subcarrier initial allocation according to the high-speed data transmission user and the basic communication user;
and the dynamic frequency resource allocation module is used for performing dynamic frequency resource allocation according to the user communication request, the current subcarrier utilization condition, the channel state and the information of the initial allocation of the subcarriers.
To achieve the above object, the present invention further provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method when executing the computer program.
To achieve the above object, the present invention further proposes a computer-readable storage medium having a computer program stored thereon, which, when being executed by a processor, implements the steps of the above method.
Compared with the prior art, the invention has the beneficial effects that:
the multi-subcarrier dynamic frequency resource allocation method for the satellite uplink communication link, provided by the invention, classifies users to allocate different subcarriers to different users, so that the communication quality is ensured; then, on the basis of adopting a modulation mode of multiple subcarriers, the subcarriers are initially distributed according to different users to ensure that the user distribution on the subcarriers is relatively uniform, so that the signal quality is ensured, the capacity of a multi-subcarrier dynamic frequency resource distribution system is improved, and meanwhile, the multi-subcarrier dynamic frequency resource distribution system effectively meets the communication requirements of high-speed data transmission users and basic communication users; and finally, according to the user communication request, the current frequency utilization condition, the channel state and the initial subcarrier allocation, dynamic frequency resource allocation is carried out, so that the accuracy and the real-time performance of frequency allocation can be effectively realized, the communication quality of authorized users is ensured, the compatibility of various service signal types is realized, and the whole user capacity of the multi-subcarrier dynamic frequency resource allocation system is improved. The method provided by the invention has great significance for the signal system design problem of the multi-user random access two-way satellite communication system.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a flowchart of a multi-subcarrier dynamic frequency resource allocation method for a satellite uplink communication link according to the present invention;
FIG. 2 is a diagram of a multi-subcarrier spectrum in the present invention;
FIG. 3 is a block diagram of a multi-subcarrier dynamic frequency resource allocation system according to the present invention;
fig. 4 is a flowchart of a dynamic frequency resource allocation method for a high speed data transmission user according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a dynamic frequency resource allocation of a primary communication signal according to an embodiment of the present invention;
fig. 6 is a flowchart of a dynamic frequency resource allocation method for a user in a particular industry according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a multi-subcarrier dynamic frequency resource allocation method for a satellite uplink communication link, as shown in fig. 1, comprising:
101: dividing users into high-speed data transmission users and basic communication users according to the historical communication conditions of the users; the communication signal of the high-speed data transmission user is a high-speed data transmission signal, and the communication signal of the basic communication user is a basic communication signal;
the high-speed data transmission user refers to the communication signal of the user to carry out high-speed data transmission.
The basic communication user means that its communication signal performs data transmission at a normal speed.
102: carrying out multi-subcarrier modulation on the communication signals, and carrying out subcarrier initial allocation according to the high-speed data transmission user and the basic communication user so as to ensure the signal quality and the system capacity;
a multi-subcarrier spectrum diagram is shown in fig. 2.
The initial allocation of the subcarriers refers to allocating a plurality of subcarriers to different types of users so as to enable corresponding users to use the subcarriers preferentially, and if one of the subcarriers is allocated to a high-speed data transmission user, the high-speed data transmission user can use the subcarrier preferentially.
103: according to the user communication request, the current subcarrier utilization condition, the channel state and the information of subcarrier initial allocation, dynamic frequency resource allocation is performed, and the multi-subcarrier dynamic frequency allocation system is shown in fig. 3.
The user communication request refers to a communication application sent by a user to the central processing station.
The current subcarrier utilization condition refers to whether idle subcarriers exist or not, the number of basic communication users in a single subcarrier, and the like.
The channel refers to a communication channel, and the channel state refers to the influence of a signal propagation path such as path loss and fading characteristics of the channel on a signal.
The multi-subcarrier dynamic frequency resource allocation method for the satellite uplink communication link, provided by the invention, classifies users to allocate different subcarriers to different users, so that the communication quality is ensured; then, on the basis of adopting a modulation mode of multiple subcarriers, the subcarriers are initially distributed according to different users to ensure that the user distribution on the subcarriers is relatively uniform, so that the signal quality is ensured, the capacity of a multi-subcarrier dynamic frequency resource distribution system is improved, and meanwhile, the multi-subcarrier dynamic frequency resource distribution system effectively meets the communication requirements of high-speed data transmission users and basic communication users; and finally, according to the user communication request, the current frequency utilization condition, the channel state and the initial subcarrier allocation, dynamic frequency resource allocation is carried out, so that the accuracy and the real-time performance of frequency allocation can be effectively realized, the communication quality of authorized users is ensured, the compatibility of various service signal types is realized, and the whole user capacity of the multi-subcarrier dynamic frequency resource allocation system is improved.
In one embodiment, for step 102, the step of performing initial allocation of subcarriers according to the high speed data transmission user and the basic communication user includes:
and carrying out subcarrier initial allocation according to the high-speed data transmission user and the basic communication user, allocating communication signals of the high-speed data transmission user to idle subcarriers, and allocating the communication signals of the basic communication user to subcarriers containing other basic communication users. The distribution can ensure that the users on the plurality of subcarriers are distributed more uniformly, thereby ensuring the signal quality and simultaneously improving the capacity of the multi-subcarrier dynamic frequency resource distribution system.
An idle subcarrier refers to a subcarrier that is not used by a user.
Users communicate by broadcasting communication signals in a single subcarrier, while there may be multiple randomly accessed users' signals in the same subcarrier.
The high-speed data transmission user needs to adopt higher transmitting power to ensure the data transmission quality, so that strong interference is generated on signals in the same sub-carrier, and the sub-carrier for high-speed data transmission to ensure the signal quality of the user is an idle sub-carrier.
The transmission power of the basic communication user is lower, and the signal gain is improved by adopting a spread spectrum mode, so that the method can tolerate larger user multiple access interference, can tolerate simultaneous access of more paths of signals, and has low data transmission speed. The low-power communication signals can be used for grading the speed, the interference between the signals is still within a controllable range, and the overlapping transmission of multipath signals with different speeds can be realized.
In the next embodiment, for step 103, the dynamic frequency resource allocation includes three allocation manners, which are respectively: the method comprises a high-speed data transmission user dynamic frequency resource allocation mode, a basic communication signal dynamic frequency resource allocation mode and a specific industry user dynamic frequency resource allocation mode.
In a certain embodiment, the dynamic frequency resource allocation method for the high speed data transmission user specifically includes:
201: monitoring the dynamic condition of idle subcarriers in each subcarrier by using a central processing station;
202: and receiving a high-speed communication application sent by a high-speed data transmission user by using a central processing station, wherein the central processing station allocates idle subcarriers for the high-speed data transmission user according to the high-speed communication application and broadcasts the idle subcarriers to the user through a downlink.
In the next embodiment, the allocation manner of the dynamic frequency resource of the high speed data transmission user includes two cases, as shown in fig. 4, which is:
if idle subcarriers exist in the multi-subcarrier dynamic frequency resource allocation system at the moment through monitoring of the central processing station, the central processing station allocates the idle subcarriers for the high-speed data transmission user according to the high-speed communication application and broadcasts the idle subcarriers to the high-speed data transmission user through a downlink;
if the central processing station monitors that no idle sub-carrier exists in the multi-sub-carrier dynamic frequency resource allocation system, the high-speed data transmission user needs to wait until the central processing station monitors that the idle sub-carrier exists in the multi-sub-carrier dynamic frequency resource allocation system and broadcasts to the high-speed data transmission user through a downlink.
In another embodiment, the subcarriers are respectively numbered from SF1 to SFN from low to high according to the central frequency point, where N is the number of subcarriers within the bandwidth range;
as shown in fig. 5, the dynamic frequency resource allocation method of the basic communication signal specifically includes:
301: estimating the tolerable maximum signal quantity of each subcarrier according to the reference carrier-to-noise ratio of all subcarrier receiving signals;
302: the use of the sub-carriers is used in sequence according to the sequence of SF 1-SFN, a central processing station is utilized to receive the basic communication application of a basic communication user, the central processing station monitors the signal quantity on each sub-carrier and broadcasts the occupation condition of the sub-carriers to the basic communication user, and when the signal quantity carried on the sub-carriers reaches 95% of the maximum signal quantity carried by the current sub-carriers, the sub-carriers used by the basic communication user are delayed backwards;
303: when the number of signals carried by all subcarriers reaches 95% of the maximum number of signals, the central processing station gives an alarm to all basic communication users, and the basic communication users select to continue sending basic communication applications to the central processing station or select to wait for communication after the occupation amount of the subcarriers is reduced according to the communication emergency degree of the basic communication users;
304: and when the number of signals carried by all the subcarriers reaches the maximum number of signals, the central processing station suspends receiving the basic communication application until the number of signals carried by a certain subcarrier is reduced to be less than 95% of the maximum number of signals.
In a next embodiment, the dynamic frequency resource allocation method for the specific industry user is shown in fig. 6, and specifically includes:
401: allocating a specific signal bandwidth and a specific subcarrier for a specific industry user in advance, wherein the specific industry user has a priority usage right in the specific signal bandwidth and the specific subcarrier;
402: receiving a specific communication application of a specific industry user by using a central processing station, wherein the central processing station monitors the number of signals on a specific subcarrier, and if the number of signals carried by the specific subcarrier is lower than 90% of the maximum number of the carried signals, the central processing station dynamically allocates the specific subcarrier to the basic communication user for use; otherwise, the specific subcarrier only supports the specific industry user to communicate.
The invention also provides a multi-subcarrier dynamic frequency resource allocation system for a satellite uplink communication link, which comprises:
the user classification module is used for classifying users into high-speed data transmission users and basic communication users according to the historical communication conditions of the users; the communication signal of the high-speed data transmission user is a high-speed data transmission signal, and the communication signal of the basic communication user is a basic communication signal;
a subcarrier initial allocation module, configured to perform multi-subcarrier modulation on the communication signal, and perform subcarrier initial allocation according to the high-speed data transmission user and the basic communication user;
and the dynamic frequency resource allocation module is used for performing dynamic frequency resource allocation according to the user communication request, the current subcarrier utilization condition, the channel state and the information of the initial allocation of the subcarriers.
In one embodiment, for the subcarrier initial allocation module, the step of performing subcarrier initial allocation according to the high-speed data transmission user and the basic communication user includes:
and carrying out subcarrier initial allocation according to the high-speed data transmission user and the basic communication user, allocating the communication signals of the high-speed data transmission user to idle subcarriers, and allocating the communication signals of the basic communication user to subcarriers containing other basic communication users. The distribution can ensure that the users on the plurality of subcarriers are distributed more uniformly, thereby ensuring the signal quality and simultaneously improving the capacity of the multi-subcarrier dynamic frequency resource distribution system.
In the next embodiment, for the dynamic frequency resource allocation module, the dynamic frequency resource allocation includes three allocation manners, which are respectively: the method comprises a high-speed data transmission user dynamic frequency resource allocation mode, a basic communication signal dynamic frequency resource allocation mode and a specific industry user dynamic frequency resource allocation mode.
In a certain embodiment, the dynamic frequency resource allocation method for the high speed data transmission user specifically includes:
monitoring the dynamic condition of idle subcarriers in each subcarrier by using a central processing station;
and receiving a high-speed communication application sent by a high-speed data transmission user by using a central processing station, wherein the central processing station allocates idle subcarriers for the high-speed data transmission user according to the high-speed communication application and broadcasts the idle subcarriers to the user through a downlink.
In the next embodiment, the allocation manner of the dynamic frequency resource of the high speed data transmission user includes two cases, as shown in fig. 4, which is:
if idle subcarriers exist in the multi-subcarrier dynamic frequency resource allocation system at the moment through monitoring of the central processing station, the central processing station allocates the idle subcarriers for the high-speed data transmission user according to the high-speed communication application and broadcasts the idle subcarriers to the high-speed data transmission user through a downlink;
if the central processing station monitors that no idle sub-carrier exists in the multi-sub-carrier dynamic frequency resource allocation system, the high-speed data transmission user needs to wait until the central processing station monitors that the idle sub-carrier exists in the multi-sub-carrier dynamic frequency resource allocation system and broadcasts to the high-speed data transmission user through a downlink.
In another embodiment, the subcarriers are respectively numbered from SF1 to SFN from low to high according to the central frequency point, where N is the number of subcarriers within the bandwidth range;
as shown in fig. 5, the dynamic frequency resource allocation method of the basic communication signal specifically includes:
estimating the tolerable maximum signal quantity of each subcarrier according to the reference carrier-to-noise ratio of all subcarrier receiving signals;
the use of the sub-carriers is used in sequence according to the sequence of SF 1-SFN, a central processing station is utilized to receive the basic communication application of a basic communication user, the central processing station monitors the signal quantity on each sub-carrier and broadcasts the occupation condition of the sub-carriers to the basic communication user, and when the signal quantity carried on the sub-carriers reaches 95% of the maximum signal quantity carried by the current sub-carriers, the sub-carriers used by the basic communication user are delayed backwards;
when the number of signals carried by all subcarriers reaches 95% of the maximum number of signals, the central processing station gives an alarm to all basic communication users, and the basic communication users select to continue sending basic communication applications to the central processing station or select to wait for communication after the occupation amount of the subcarriers is reduced according to the communication emergency degree of the basic communication users;
and when the number of signals carried by all the subcarriers reaches the maximum number of signals, the central processing station suspends receiving the basic communication application until the number of signals carried by a certain subcarrier is reduced to be less than 95% of the maximum number of signals.
In a next embodiment, the dynamic frequency resource allocation method for the specific industry user is shown in fig. 6, and specifically includes:
allocating a specific signal bandwidth and a specific subcarrier for a specific industry user in advance, wherein the specific industry user has a priority usage right in the specific signal bandwidth and the specific subcarrier;
receiving a specific communication application of a specific industry user by using a central processing station, wherein the central processing station monitors the number of signals on a specific subcarrier, and if the number of signals carried by the specific subcarrier is lower than 90% of the maximum number of the carried signals, the central processing station dynamically allocates the specific subcarrier to the basic communication user for use; otherwise, the specific subcarrier only supports the specific industry user to communicate.
The invention further provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method when executing the computer program.
The invention also proposes a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method described above.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A multi-subcarrier dynamic frequency resource allocation method for a satellite uplink communication link, comprising:
dividing users into high-speed data transmission users and basic communication users according to the historical communication conditions of the users; the communication signal of the high-speed data transmission user is a high-speed data transmission signal, and the communication signal of the basic communication user is a basic communication signal;
carrying out multi-subcarrier modulation on the communication signal, and carrying out subcarrier initial allocation according to the high-speed data transmission user and the basic communication user;
and according to the user communication request, the current subcarrier utilization condition, the channel state and the information of the initial subcarrier allocation, performing dynamic frequency resource allocation.
2. The method of claim 1, wherein the step of performing initial allocation of subcarriers according to the high speed data transmission users and the basic communication users comprises:
and carrying out subcarrier initial allocation according to the high-speed data transmission user and the basic communication user, allocating communication signals of the high-speed data transmission user to idle subcarriers, and allocating the communication signals of the basic communication user to subcarriers containing other basic communication users.
3. The method of claim 2, wherein the dynamic frequency resource allocation comprises three allocation modes, respectively: the method comprises a high-speed data transmission user dynamic frequency resource allocation mode, a basic communication signal dynamic frequency resource allocation mode and a specific industry user dynamic frequency resource allocation mode.
4. The method according to claim 3, wherein the dynamic frequency resource allocation method for the high speed data transmission users comprises:
monitoring the dynamic condition of idle subcarriers in each subcarrier by using a central processing station;
and receiving a high-speed communication application sent by a high-speed data transmission user by using a central processing station, wherein the central processing station allocates idle subcarriers for the high-speed data transmission user according to the high-speed communication application and broadcasts the idle subcarriers to the user through a downlink.
5. The method of claim 4, wherein the dynamic frequency resource allocation for high speed data transmission users comprises two cases:
if idle subcarriers exist in the multi-subcarrier dynamic frequency resource allocation system at the moment through monitoring of the central processing station, the central processing station allocates the idle subcarriers for the high-speed data transmission user according to the high-speed communication application and broadcasts the idle subcarriers to the high-speed data transmission user through a downlink;
if the central processing station monitors that no idle sub-carrier exists in the multi-sub-carrier dynamic frequency resource allocation system, the high-speed data transmission user needs to wait until the central processing station monitors that the idle sub-carrier exists in the multi-sub-carrier dynamic frequency resource allocation system and broadcasts to the high-speed data transmission user through a downlink.
6. The method according to claim 3, wherein the subcarriers are numbered SF 1-SFN from low to high according to the center frequency point, where N is the number of subcarriers within the bandwidth range;
the dynamic frequency resource allocation method of the basic communication signal specifically includes:
estimating the tolerable maximum signal quantity of each subcarrier according to the reference carrier-to-noise ratio of all subcarrier receiving signals;
the use of the sub-carriers is used in sequence according to the sequence of SF 1-SFN, a central processing station is utilized to receive the basic communication application of a basic communication user, the central processing station monitors the signal quantity on each sub-carrier and broadcasts the occupation condition of the sub-carriers to the basic communication user, and when the signal quantity carried on the sub-carriers reaches 95% of the maximum signal quantity carried by the current sub-carriers, the sub-carriers used by the basic communication user are delayed backwards;
when the number of signals carried by all subcarriers reaches 95% of the maximum number of signals, the central processing station gives an alarm to all basic communication users, and the basic communication users select to continue sending basic communication applications to the central processing station or select to wait for communication after the occupation amount of the subcarriers is reduced according to the communication emergency degree of the basic communication users;
and when the number of signals carried by all the subcarriers reaches the maximum number of signals, the central processing station suspends receiving the basic communication application until the number of signals carried by a certain subcarrier is reduced to be less than 95% of the maximum number of signals.
7. The method of claim 3, wherein the industry-specific user dynamic frequency resource allocation specifically comprises:
allocating a specific signal bandwidth and a specific subcarrier for a specific industry user in advance, wherein the specific industry user has a priority usage right in the specific signal bandwidth and the specific subcarrier;
receiving a specific communication application of a specific industry user by using a central processing station, wherein the central processing station monitors the number of signals on a specific subcarrier, and if the number of signals carried by the specific subcarrier is lower than 90% of the maximum number of the carried signals, the central processing station dynamically allocates the specific subcarrier to the basic communication user for use; otherwise, the specific subcarrier only supports the specific industry user to communicate.
8. A multi-subcarrier dynamic frequency resource allocation system for a satellite uplink communication link, comprising:
the user classification module is used for classifying users into high-speed data transmission users and basic communication users according to the historical communication conditions of the users; the communication signal of the high-speed data transmission user is a high-speed data transmission signal, and the communication signal of the basic communication user is a basic communication signal;
a subcarrier initial allocation module, configured to perform multi-subcarrier modulation on the communication signal, and perform subcarrier initial allocation according to the high-speed data transmission user and the basic communication user;
and the dynamic frequency resource allocation module is used for performing dynamic frequency resource allocation according to the user communication request, the current subcarrier utilization condition, the channel state and the information of the initial allocation of the subcarriers.
9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor when executing the computer program implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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