CN112564764B - User access simulation system and method for broadband satellite communication system - Google Patents
User access simulation system and method for broadband satellite communication system Download PDFInfo
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Abstract
The invention provides a user access simulation system and a method facing a broadband satellite communication system, comprising the following steps: the user access simulation system adopts a framework of combining a GPU and a CPU, wherein: the user access simulation system adopts a CPU to control and distribute user access simulation tasks, including user definition, signal parameter generation and reading; the user access simulation system adopts a GPU to finish the generation of access signals of a plurality of independent users in parallel by taking the user as a unit; the user access simulation system adopts the GPU to construct the operating environment of a user control algorithm and a digital signal generation algorithm so as to ensure the real-time performance of user access simulation.
Description
Technical Field
The invention relates to the technical field of communication satellites, in particular to a user access simulation system and a user access simulation method for a broadband satellite communication system.
Background
The low-orbit broadband satellite communication system is a huge and complex network system, is high in construction cost and long in construction period, and can be used for constructing a set of ground test verification system on the ground, verifying key technologies, testing system capacity and indexes, and performing recurrence and troubleshooting on abnormal problems in order to reduce the risk of construction of the system, so that the reliability of the system is greatly improved, and reliable and effective support can be provided for construction and operation of an actual system. The main function of the low-orbit broadband satellite communication system is to provide high-speed communication service for a large number of global users, so how to simulate the access behavior of wide-area coverage users is a key link for carrying out full-system test verification. By developing user communication access simulation, key service performance indexes such as verification protocol correctness, interface matching, time delay, throughput, network load and the like can be effectively supported.
In large-scale user random access simulation, a batch of test terminals are usually designed by utilizing hardware such as an FPGA (field programmable gate array) and a DSP (digital signal processor), unified control is carried out to simulate a large number of user terminal access behaviors of a real system, the states of the test terminals and the real terminals have higher consistency, a large number of access signals can be simultaneously generated, the signal processing real-time performance is better, the simulation effect is closer to the actual effect, but the mode has the disadvantages of complex system, higher cost and poor expandability. In addition, when some simulation systems develop user access simulation, a mode of combining software and hardware is adopted, a small amount of hardware test terminals are adopted to simulate user access, physical processes such as signal modulation and demodulation are verified, large-scale user access test is realized by software simulation, protocol layer verification is emphasized, and the mode is different from the actual scene of the system.
Disclosure of Invention
The invention aims to provide a user access simulation system and a user access simulation method for a broadband satellite communication system, and aims to solve the problems that an existing large-scale user random access simulation system is complex, high in cost, poor in expandability or low in simulation precision.
In order to solve the above technical problem, the present invention provides a user access simulation system for a broadband satellite communication system, comprising:
the user access simulation system adopts a framework of combining a GPU and a CPU, wherein:
the user access simulation system adopts a CPU to control and distribute user access simulation tasks, including user definition, signal parameter generation and reading;
the user access simulation system adopts a GPU to finish the generation of access signals of a plurality of independent users in parallel by taking the user as a unit;
the user access simulation system adopts the GPU to construct the operating environment of a user control algorithm and a digital signal generation algorithm so as to ensure the real-time performance of user access simulation.
Optionally, in the user access analog system for the broadband satellite communication system, the user access analog system includes a user mode control module and a digital signal generation module, where:
the user mode control module is used for allocating task parameters according to a simulation scene, wherein the task parameters comprise the number of users, the types of the users, the proportion of the users, the distribution area, the distribution mode and the flow of the users, and each task parameter is provided to a system built-in model;
the user mode control module simulates user positions and user access behaviors, wherein the number and the positions of users are set according to requirements, and the user access is divided into a random access mode and a timing cycle access mode;
the digital signal generation module generates digital baseband signals in a GPU parallel thread mode according to the number of users generated by the user mode control module, the characteristic identification codes of the users and the time sequence generated by the user signals, so that the real-time performance of the multi-user digital signal generation is guaranteed.
Optionally, in the user access simulation system for the broadband satellite communication system, the user access simulation system further includes an interface communication module, where:
the interface communication module is communicated with other subsystems through optical fibers, and the other subsystems comprise an environment channel simulation system, a communication satellite simulation system, an operation simulation system, an efficiency evaluation system, a ground operation control simulation system and a ground measurement and control simulation system.
Optionally, in the user access simulation system for the broadband satellite communication system, a workflow of the user access simulation system is as follows:
the CPU reads the task parameters configured according to the simulation scene to acquire a user access simulation task and determine a simulation access scene;
the CPU uniformly schedules the access time of each user and/or the generation time parameter of each user signal according to the simulation access scene, supports a random access mode and a timing cycle access mode according to an access protocol, and transmits the generation time parameter of the user signal to a storage space opened by the GPU.
Optionally, in the user access simulation system for the broadband satellite communication system, a workflow of the user access simulation system further includes:
establishing a GPU thread structure, wherein the GPU comprises M parallel thread blocks, N threads are supported and operated in each parallel thread block, K threads in the N threads take users as units, each thread independently completes a user signal generation task, and the rest N-K threads complete signal combination tasks;
the CPU distributes the generation tasks of the user signals of the GPU according to the number of the users and the distribution area, determines the users corresponding to each thread of the GPU, distributes the users in the same wave position to a plurality of processes in the same thread block so as to ensure the balance of the tasks, and distributes the users in the same wave position to the processes in the same thread block, so that the total number of the users in each thread block is the same.
Optionally, in the user access simulation system for the broadband satellite communication system, a workflow of the user access simulation system further includes:
defining the number of wave bits allocated in a thread block to be P, and the number of analog users in each wave bit to be Ui (i is 1,2,3, …, P), the following constraint relationship exists: N-K is more than or equal to P,
the GPU reads signal parameters prestored in a storage space according to the distributed tasks, executes user signal generation tasks in parallel and stores the generated signals in a memory;
when the total number of the users in the simulation access scene is larger than the number of bus processes which can be supported by the GPU, the tasks are executed in blocks, all user signal generation tasks in one wave position are executed by taking the wave position as a unit, the generated signals are stored in a memory, and all user signal generation in the next wave position is continuously executed until all signals are generated.
Optionally, in the user access simulation system for the broadband satellite communication system, a workflow of the user access simulation system further includes:
each thread block of the GPU is responsible for executing threads of a combining task, signals are sequenced and combined according to the access time of each signal, all users in the same wave position are accessed to intermediate frequency signals to execute combining by taking the wave position as a unit, each wave position corresponds to one path of signal, and the signals are transmitted back to a local memory after being quantized;
optionally, in the user access simulation system for the broadband satellite communication system, a workflow of the user access simulation system further includes:
the digital intermediate frequency signal of the local memory is the output of the user access analog system, and the data is matched with a broadband communication constellation ground test verification system and is transmitted to other subsystems by using optical fibers in time.
The invention also provides a user access simulation method facing the broadband satellite communication system, wherein the user access simulation system adopts a framework combining GPU and CPU, wherein:
the user access simulation system adopts a CPU to control and distribute user access simulation tasks, including user definition, signal parameter generation and reading;
the user access simulation system adopts a GPU to finish the generation of access signals of a plurality of independent users in parallel by taking the user as a unit;
the user access simulation system adopts the GPU to construct the operating environment of a user control algorithm and a digital signal generation algorithm so as to ensure the real-time performance of user access simulation.
In the user access simulation system and method for the broadband satellite communication system, which are provided by the invention, based on the architecture of GPU + CPU, the user access simulation system for the low-orbit broadband satellite communication system is provided, the system supports independent configuration of user access signals by taking a single user as a unit, relatively truly simulates large-scale user access behaviors of the low-orbit broadband satellite communication system, combines the characteristics of strong GPU parallel processing capability and flexible CPU development and configuration, overcomes the defects of strong complexity and high cost of a large-scale communication user access signal simulation system under the traditional hardware architecture based on FPGA + DSP, overcomes the defect of insufficient authenticity of the traditional software simulation or a small amount of hardware simulation, and has good authenticity, economy and expansibility.
The invention provides a high-efficiency communication user access simulation system based on a GPU and a CPU, which can be applied to a broadband communication constellation ground test verification system, generates a large number of user access signals with low resource overhead and simulates access behaviors of a large number of satellite communication terminals. The system can replace the traditional communication user to access a large batch of independent test terminals of the simulation test, and has low cost, high efficiency and flexible scheduling. Compared with the prior art, the invention has the beneficial effects that:
by adopting the architecture of GPU + CPU, the advantage of strong parallel computing capability of the GPU is fully exerted, a large number of tasks for generating user access signals can be executed simultaneously, the signal generation and processing efficiency is high, and the time for signal simulation generation is reduced;
by adopting a GPU + CPU architecture and global task control by taking a user as a unit through the CPU, the generated user access signal can be parameterized and configured according to external requirements, and meanwhile, a parameter model is built in, so that the access behaviors of a large number of user terminals can be restored relatively truly;
compared with an analog signal generation system which generally adopts FPGA + DSP, the system mainly adopts a general computer, supports the rapid development of different protocols and different systems, and has great advantages in the aspects of upgrading optimization, updating iteration, operation maintenance and the like;
according to the broadband communication satellite multi-beam characteristics, the unified task allocation is executed on the multi-user terminals in the same wave position by taking the wave beams as units, the thread tasks in the GPU thread blocks are reasonably optimized, and the operation efficiency of the GPU is improved.
Drawings
FIG. 1 is a schematic diagram of a distributed broadband communication constellation ground test verification system adapted to multiple scenarios according to an embodiment of the present invention;
shown in the figure: 1-an environmental channel simulation subsystem; 2-user access simulation subsystem; 3-a communication satellite simulation subsystem; 4-operating the simulation subsystem; 5-a performance evaluation subsystem; 6-a ground operation control simulation subsystem; 7-ground measurement and control simulation subsystem.
Detailed Description
The user access simulation system for the broadband satellite communication system according to the present invention is further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Furthermore, features from different embodiments of the invention may be combined with each other, unless otherwise indicated. For example, a feature of the second embodiment may be substituted for a corresponding or functionally equivalent or similar feature of the first embodiment, and the resulting embodiments are likewise within the scope of the disclosure or recitation of the present application.
The core idea of the invention is to provide a user access simulation system facing a broadband satellite communication system, so as to solve the problems of complexity, higher cost, poor expandability or low simulation precision of the existing large-scale user random access simulation system.
In order to realize the idea, the invention provides a user access simulation system facing a broadband satellite communication system, which comprises: the user access simulation system adopts a framework of combining a GPU and a CPU, wherein: the user access simulation system adopts a CPU to control and distribute user access simulation tasks, including user definition, signal parameter generation and reading; the user access simulation system adopts a GPU to finish the generation of access signals of a plurality of independent users in parallel by taking the user as a unit; the user access simulation system adopts the GPU to construct the operating environment of a user control algorithm and a digital signal generation algorithm so as to ensure the real-time performance of user access simulation.
The invention relates to the technical field of ground simulation of a low-orbit broadband satellite communication system, in particular to a user access simulation system design for the low-orbit broadband satellite communication system.
The embodiment provides a user access simulation system facing a low-orbit broadband satellite communication system based on a GPU + CPU architecture, the system supports independent configuration of user access signals by taking a single user as a unit, simulates large-scale user access behaviors of the low-orbit broadband satellite communication system more truly, combines the characteristics of strong GPU parallel processing capacity and flexible CPU development and configuration, overcomes the defects of strong complexity and high cost of a large-scale communication user access signal simulation system based on a traditional FPGA + DSP hardware architecture, overcomes the defect of insufficient authenticity of a traditional software simulation or a small amount of hardware simulation, and has good authenticity, economy and expansibility.
The invention provides a high-efficiency communication user access simulation system based on a GPU and a CPU, which can be applied to a broadband communication constellation ground test verification system, generates a large number of user access signals with low resource overhead and simulates access behaviors of a large number of satellite communication terminals. The system can replace the traditional communication user to access a large batch of independent test terminals of the simulation test, and has low cost, high efficiency and flexible scheduling.
Specifically, the user access simulation system is composed of a user mode control module, a digital signal generation module and an interface communication module. The user access simulation subsystem adopts a framework of GPU + CPU, the CPU completes task control and distribution, user definition, signal parameter generation and reading and the like, and the GPU completes the access signal generation of a plurality of independent users in parallel by taking the users as units.
Compared with the prior art, the invention has the beneficial effects that:
by adopting the architecture of GPU + CPU, the advantage of strong parallel computing capability of the GPU is fully exerted, a large number of tasks for generating user access signals can be executed simultaneously, the signal generation and processing efficiency is high, and the time for signal simulation generation is reduced;
by adopting a GPU + CPU architecture and global task control by taking a user as a unit through the CPU, the generated user access signal can be parameterized and configured according to external requirements, and meanwhile, a parameter model is built in, so that the access behaviors of a large number of user terminals can be restored relatively truly;
compared with an analog signal generation system which generally adopts FPGA + DSP, the system mainly adopts a general computer, supports the rapid development of different protocols and different systems, and has great advantages in the aspects of upgrading optimization, updating iteration, operation maintenance and the like;
according to the broadband communication satellite multi-beam characteristics, the unified task allocation is executed on the multi-user terminals in the same wave position by taking the wave beams as units, the thread tasks in the GPU thread blocks are reasonably optimized, and the operation efficiency of the GPU is improved.
In one embodiment of the invention, the user access analog system is composed of a user mode control module, a digital signal generation module and an interface communication module. The interface communication module communicates with other systems through optical fibers.
In order to ensure the real-time performance of simulation, the user access simulation subsystem adopts a GPU to realize the operation environment of a user control algorithm and a digital signal generation algorithm. The user access simulation subsystem adopts a framework of GPU + CPU, the CPU completes task control and distribution, user definition, signal parameter generation and reading and the like, and the GPU completes the access signal generation of a plurality of independent users in parallel by taking the users as units.
The user mode control module can configure parameters mainly including user number, user type, user proportion, distribution area, distribution mode and user flow according to a simulation scene, and each parameter provides a system built-in model and the like. The user mode control module can simulate the user position and the user access behavior, wherein the number of the users and the user position can be set according to requirements, and the user access is divided into different modes such as random access, timing cycle access and the like.
The digital signal generating module generates digital baseband signals according to the number of users generated by the user mode control module, the characteristic identification codes of the users, the time sequence generated by the user signals and the like. The digital baseband signal is generated in a GPU parallel thread mode, and the real-time performance of multi-user digital signal generation can be guaranteed.
In one embodiment of the present invention, the workflow of the user access simulation system is as follows:
the CPU obtains a user access simulation task by reading scene configuration parameters and determines an access scene, wherein the configuration parameters mainly comprise the number of users, the types of the users, the proportion of the users, a distribution area, a distribution mode and user flow, and each parameter provides a system built-in model;
the CPU uniformly schedules the access time of each user, namely the generation time of each user signal according to the simulation scene, supports random access and timing access according to a protocol, and transmits the signal generation time parameter to a storage space opened up by the GPU;
designing a GPU thread structure, wherein the GPU totally comprises M parallel thread blocks, N threads are supported and operated in each thread block, K threads in the N threads take users as units, each thread independently completes a user signal generation task, and the rest N-K threads complete signal combination tasks;
the CPU distributes the user signal generation tasks of the GPU according to the number of the users and the distribution area, determines the users corresponding to each thread of the GPU, distributes the users in the same wave position to a plurality of processes in the same thread block in order to ensure the balance of the tasks, and the total number of the users in each thread block is as same as possible. Defining the number of wave bits allocated in a thread block to be P, and the number of analog users in each wave bit to be Ui (i is 1,2,3, …, P), the following constraint relationship exists: N-K is more than or equal to P,
the GPU reads signal parameters prestored in a storage space according to the distributed tasks, executes user signal generation tasks in parallel and stores the generated signals in a memory;
when the total number of users in the simulation scene is larger than the number of bus processes which can be supported by the GPU, executing the tasks in blocks, taking the wave positions as units, after all user signal generation tasks in one wave position are executed, storing the generated signals into a memory, and continuing to execute all user signal generation in the next wave position until all signals are generated;
each thread block of the GPU is responsible for executing threads of a combining task, signals are sequenced and combined according to the access time of each signal, all users in the same wave position are accessed to intermediate frequency signals to execute combining by taking the wave position as a unit, each wave position corresponds to one path of signal, and the signals are transmitted back to a local memory after being quantized;
the digital intermediate frequency signal of the local memory is the output of the user access analog system, and the data is matched with a broadband communication constellation ground test verification system and is transmitted to other systems in time by using optical fibers.
As shown in fig. 1, a user access simulation system 2 and other subsystems form a communication satellite constellation ground test verification system, which includes a user access simulation system 2, an environmental channel simulation system 1, a communication satellite simulation system 3, an operation simulation system 4, an efficiency evaluation system 5, a ground operation and control simulation system 6, a ground measurement and control simulation system 7, and the like. When each subsystem is deployed in different regions, the supporting environment channel simulation system 1 is required to simulate real received signals. Meanwhile, time synchronization among the subsystems is realized through a common-view receiver method among the subsystems.
The subsystems directly transmit digital intermediate frequency signals of the transmitted signals to an environment channel simulation subsystem 1 of a receiving end through optical fibers, simulate time delay and dynamics of real signals through the environment channel simulation subsystem 1 of the receiving end, filter the digital intermediate frequency signals through a high-order filter to simulate signal distortion in the real environment, and generate real radio frequency signals through DA conversion and radio frequency signal up-conversion.
Specifically, the communication satellite constellation ground test verification system is composed of a user access simulation system 2, an environment channel simulation system 1, a communication satellite simulation system 3, an operation simulation system 4, an efficiency evaluation system 5, a ground operation and control simulation system 6, a ground measurement and control simulation system 7 and the like. The subsystems can be deployed in different regions, and the subsystems in different regions need to be matched with the environment channel simulation system 1 to simulate real received signals. Meanwhile, all subsystems are communicated through optical fiber connection, and time synchronization among all subsystems is achieved through a common-view receiver method.
The user access simulation system 2 is mainly used for simulating a random access mode of a ground user. The device consists of a user mode control module, a digital signal generation module and an interface communication module. The user mode control module can simulate the user position and the user access behavior, wherein the number of the users and the user position can be set according to requirements, and the user access is divided into random access and timing cycle access. The user communication module is used for ensuring the real-time performance of simulation with other subsystems, and the user access simulation system adopts the GPU to realize the operating environment of a user control algorithm and a digital signal generation algorithm.
The environmental channel simulation system 1 is a medium for signal and information interaction of each system, and can simulate signal distortion according to real channel characteristics. The environment channel simulation system can utilize a high-order digital filter to filter the received digital intermediate-frequency signal sent by the operation simulation system according to the characteristics of real channel, such as group delay, and the like, and then generate a simulation signal simulating the characteristics of the real channel through DA conversion.
The operation simulation system 4 is a control center of the whole ground test verification system and completes generation, simulation and control of a system operation scene. The operation simulation system consists of an operation state configuration and routing module, a virtual satellite module, a virtual ground station module and an interface communication module. And the operation state configuration and routing complete satellite number setting and operation state, orbit state simulation, inter-constellation routing simulation, channel delay simulation and operation control simulation. The channel delay simulation is to calculate the channel distance according to the running orbit and the route setting, and simulate the channel delay and the signal Doppler dynamic according to the distance calculation and the orbit state. The virtual satellite module simulates a virtual satellite according to the running state configuration, simulates a real satellite to receive signals and process the received signals and generates required digital signals. The virtual ground station simulates a ground station signal processing process and an information generation process. The interface communication module completes the communication between the operation simulation system and other subsystems.
The communication satellite simulation system 3 performs a physical reality simulation of the satellite state. The communication satellite simulation system 3 consists of an interface communication module, a multi-bus verification module, a platform comprehensive processing module, a load comprehensive processing module, a radio frequency processing module, a mechanism control simulation module, a simulation verification module and an anti-irradiation verification module, can perform real satellite platform operation and signal processing simulation, load operation and signal processing simulation, and can be used as a simulation verification platform of a new algorithm of a communication satellite and a verification platform applying a universal low-level chip anti-irradiation algorithm.
The subsystem adopts the design of plug-in card formula on the single machine aspect, adopts the design of mother-daughter board on the board aspect, and the flexibility and the organic unity of authenticity of furthest assurance system. In the unit aspect, adopt quick-witted case and integrated circuit board plug-in card formula design, the quick-witted case provides power supply and control signal transmission, simultaneously, adopts the design that radio frequency channel and signal processing integrated circuit board split, when new frequency point or new system are verified to needs, only need change corresponding radio frequency channel or signal processing integrated circuit board, need not redesign the principle appearance of whole unit, has guaranteed the flexibility and the high efficiency of extension. After principle verification is finished, the authenticity of the system can be ensured under the principle of replacement and minimization only by designing the actual circuit board of the last satellite single machine into a board card form and replacing the corresponding board card.
The board card layer adopts the modular design of a mother board and a daughter board, for example, the board card is used as a mother board, a slot is designed according to the maximization principle, and FPGAs and CPUs of different models are welded on the daughter board. The daughter board may be connected to the motherboard through a socket. When the FPGA or the CPU needs to be replaced, only the corresponding daughter board needs to be replaced, so that the system is convenient to upgrade to the maximum extent and the system cost is saved.
The ground measurement and control simulation system 7 and the ground operation and control simulation system 6 are added into a ground test verification system by utilizing a real physical ground station, and the authenticity of system simulation is improved by adopting a soft and hard cooperative mode.
The efficiency evaluation system 5 is composed of an interface communication module, a report generation module and an efficiency evaluation module, and evaluates the operation efficiency, the system capacity, the error rate and the like of the whole system in real time by collecting the intermediate state and the operation result of the operation of each subsystem, and automatically generates an evaluation report according to the efficiency evaluation result.
The distributed system mainly means that all subsystems forming the ground test verification system can be distributed in different places and are accessed into the system through the environmental channel simulation subsystem 1, information remote transmission can be carried out among all subsystems of a user through optical fibers, and radio frequency signals simulating real channels are generated locally through the attached environmental channel simulation subsystem 1. The scheme is not limited by the region and space of each subsystem, and the new subsystem can be flexibly expanded only by matching with the corresponding environment channel simulation subsystem 1.
The invention also provides a solution of a distributed communication satellite constellation ground test verification system suitable for multiple scenes aiming at the construction of the communication satellite constellation ground test verification system. The method can realize ground test verification that the arrangement among the subsystems is not limited by regions, and can quickly and flexibly expand the subsystems. Meanwhile, the invention respectively carries out innovative design from a system level, a single machine level and a board card level, gives consideration to the authenticity and the flexibility of the system, and reduces the system cost on the basis of ensuring the authenticity. Compared with the traditional ground test verification scheme, the method has the advantages of no region limitation, flexible system and single machine expansion, software and hardware collaborative simulation, more consistent technical state with a real system, low updating and upgrading cost and the like.
In summary, the above embodiments have described in detail different configurations of the user access simulation system facing the broadband satellite communication system, and it is understood that the present invention includes, but is not limited to, the configurations listed in the above embodiments, and any modifications made based on the configurations provided in the above embodiments are within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (7)
1. A user access simulation system facing a broadband satellite communication system is characterized in that the user access simulation system adopts a framework of combining a GPU and a CPU, wherein:
the user access simulation system adopts a CPU to control and distribute user access simulation tasks, including user definition, signal parameter generation and reading;
the user access simulation system adopts a GPU to finish the generation of access signals of a plurality of independent users in parallel by taking the user as a unit;
the user access simulation system adopts a GPU to construct the operating environment of a user control algorithm and a digital signal generation algorithm so as to ensure the real-time performance of user access simulation;
the user access analog system comprises a user mode control module and a digital signal generation module, wherein:
the user mode control module configures task parameters according to a simulation scene, wherein the task parameters comprise the number of users, the types of the users, the proportion of the users, the distribution area, the distribution mode and the flow of the users, and each task parameter is provided to a system built-in model;
the user mode control module simulates user positions and user access behaviors, wherein the number and the positions of users are set according to requirements, and the user access is divided into a random access mode and a timing cycle access mode;
the digital signal generation module generates digital baseband signals in a GPU parallel thread mode according to the number of users generated by the user mode control module, the characteristic identification codes of the users and the time sequence generated by the user signals, so that the real-time performance of the multi-user digital signal generation is guaranteed.
2. The broadband satellite communication system-oriented subscriber access simulation system of claim 1, wherein the subscriber access simulation system further comprises an interface communication module, wherein:
the interface communication module is communicated with other subsystems through optical fibers, and the other subsystems comprise an environment channel simulation system, a communication satellite simulation system, an operation simulation system, an efficiency evaluation system, a ground operation control simulation system and a ground measurement and control simulation system.
3. The broadband satellite communication system-oriented subscriber access simulation system of claim 1, wherein the workflow of the subscriber access simulation system is as follows:
the CPU reads the task parameters configured according to the simulation scene to acquire a user access simulation task and determine a simulation access scene;
the CPU uniformly schedules the access time of each user and/or the generation time parameter of each user signal according to the simulation access scene, supports a random access mode and a timing cycle access mode according to an access protocol, and transmits the generation time parameter of the user signal to a storage space opened by the GPU.
4. The broadband satellite communication system-oriented subscriber access simulation system of claim 3, wherein the workflow of the subscriber access simulation system further comprises:
establishing a GPU thread structure, wherein the GPU comprises M parallel thread blocks, N threads are supported and operated in each parallel thread block, K threads in the N threads take users as units, each thread independently completes a user signal generation task, and the rest N-K threads complete signal combination tasks;
the CPU distributes the generation tasks of the user signals of the GPU according to the number of the users and the distribution area, determines the users corresponding to each thread of the GPU, distributes the users in the same wave position to a plurality of processes in the same thread block so as to ensure the balance of the tasks, and distributes the users in the same wave position to the processes in the same thread block, so that the total number of the users in each thread block is the same.
5. The broadband satellite communication system-oriented subscriber access simulation system of claim 4, wherein the workflow of the subscriber access simulation system further comprises:
defining the number of wave bits allocated in a thread block to be P, and the number of analog users in each wave bit to be Ui (i is 1,2,3, …, P), the following constraint relationship exists: N-K is more than or equal to P,
the GPU reads signal parameters prestored in a storage space according to the distributed tasks, executes user signal generation tasks in parallel and stores the generated signals in a memory;
when the total number of the users in the simulation access scene is larger than the number of bus processes which can be supported by the GPU, the tasks are executed in blocks, all user signal generation tasks in one wave position are executed by taking the wave position as a unit, the generated signals are stored in a memory, and all user signal generation in the next wave position is continuously executed until all signals are generated.
6. The broadband satellite communication system-oriented subscriber access simulation system of claim 5, wherein the workflow of the subscriber access simulation system further comprises:
and each thread block of the GPU is responsible for executing a combining task, the signals are sequenced and combined according to the access time of each signal, all users in the same wave position are accessed to the intermediate frequency signal to execute combining by taking the wave position as a unit, and each wave position corresponds to one path of signal and is transmitted back to a local memory after being quantized.
7. The broadband satellite communication system-oriented subscriber access simulation system of claim 6, wherein the workflow of the subscriber access simulation system further comprises:
the digital intermediate frequency signal of the local memory is the output of the user access analog system, and the data is matched with a broadband communication constellation ground test verification system and is transmitted to other subsystems by using optical fibers in time.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008028836A2 (en) * | 2006-09-08 | 2008-03-13 | Edgeware Ab | A method and an apparatus for data streaming |
| CN108337695A (en) * | 2017-01-20 | 2018-07-27 | 维沃移动通信有限公司 | A kind of terminal capacity report method, base station and terminal |
| CN111123309A (en) * | 2019-12-31 | 2020-05-08 | 泰斗微电子科技有限公司 | Method, device and equipment for testing receiver |
Family Cites Families (5)
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| CN104597462A (en) * | 2015-02-27 | 2015-05-06 | 南通航大电子科技有限公司 | GNSS (global navigation satellite system) signal simulator and implementing method thereof on basis of GPU (graphic processing unit) |
| US10453167B1 (en) * | 2018-04-18 | 2019-10-22 | International Business Machines Corporation | Estimating performance of GPU application for different GPU-link performance ratio |
| CN111447025B (en) * | 2020-03-18 | 2022-03-11 | 重庆邮电大学 | System-level simulation platform for satellite mobile communication and construction method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008028836A2 (en) * | 2006-09-08 | 2008-03-13 | Edgeware Ab | A method and an apparatus for data streaming |
| CN108337695A (en) * | 2017-01-20 | 2018-07-27 | 维沃移动通信有限公司 | A kind of terminal capacity report method, base station and terminal |
| CN111123309A (en) * | 2019-12-31 | 2020-05-08 | 泰斗微电子科技有限公司 | Method, device and equipment for testing receiver |
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