CN111770458B - Variable modulation coding method, device and system suitable for Beidou RDSS - Google Patents
Variable modulation coding method, device and system suitable for Beidou RDSS Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
- H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H04B7/18519—Operations control, administration or maintenance
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
- H04B7/18543—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for adaptation of transmission parameters, e.g. power control
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Abstract
The application relates to a variable modulation coding method, device and system suitable for Beidou RDSS. The method comprises the following steps: receiving a communication mode request sent by a user machine; when the communication mode request is a low-speed communication mode, sending an outbound signal to the user machine to enable the user machine to carry out signal-to-noise ratio estimation on the outbound signal, generating a low-speed communication mode switching instruction according to the signal-to-noise ratio estimation result, framing the low-speed communication mode switching instruction in the inbound signal, when the communication mode request is a high-speed communication mode, carrying out signal-to-noise ratio estimation on an inbound pilot signal sent by the user machine, generating a high-speed communication mode switching instruction according to the signal-to-noise ratio estimation result, and framing the high-speed communication mode switching instruction in the outbound signal.
Description
Technical Field
The application relates to the technical field of satellite short message communication, in particular to a variable modulation coding method, device and system suitable for Beidou RDSS.
Background
The satellite short message communication system mainly comprises a space section, a ground control center and a user section, wherein the space section comprises a satellite constellation comprising a plurality of satellites, and the satellites (outbound transponders and inbound transponders) are used for forwarding outbound signals sent by the ground center station and inbound signals sent by the user machine. The ground control center completes the receiving and sending measurement of the user signal and the receiving and sending processing of the information, and manages and controls the operation of the whole system. The user segment receives data service and control message from the ground control center, and sends inbound message according to self service demand and outbound control signaling, so as to realize short message communication function.
The Beidou RDSS service system is a typical satellite short message communication system in China, a user inbound system adopts a transmission system of a fixed modulation mode and a coding mode, but because signals of the Beidou RDSS service system are easily influenced by multiple factors such as weather fading, shadow fading, multipath effect and the like, in order to ensure the communication quality, the coding modulation mode can only be fixed on low-order modulation with better robustness and low-efficiency coding, so that the spectrum utilization rate of the Beidou RDSS inbound signals and the system throughput are lower. Therefore, new designs for methods, apparatuses, and systems for communicating inbound signals are needed to improve the spectrum utilization and system throughput of the system. Only by adopting a new system, the RDSS system can compete for a place under the conditions that the ground mobile communication network is further rapidly expanded and the satellite communication service is rapidly developed.
Disclosure of Invention
Therefore, in order to solve the technical problems, a variable modulation coding method, a variable modulation coding device and a variable modulation coding system suitable for the beidou RDSS are provided, wherein the variable modulation coding method, the variable modulation coding device and the variable modulation coding system can improve the spectrum utilization rate and the system throughput of the system.
A variable modulation coding method suitable for Beidou RDSS comprises the following steps:
receiving a communication mode request sent by a user machine; the communication mode request includes: a low-speed communication mode and a high-speed communication mode;
when the communication mode request is a low-speed communication mode, sending an outbound signal to the user machine so that the user machine carries out signal-to-noise ratio estimation on the outbound signal, generating a low-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and framing the low-speed communication mode switching instruction in an inbound signal; the low-speed communication mode switching instruction is used for configuring configuration parameters of the station entering signals in the low-speed communication mode;
when the communication mode request is in a high-speed communication mode, carrying out signal-to-noise ratio estimation on an inbound pilot signal sent by a user machine, generating a high-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and framing the high-speed communication mode switching instruction in an outbound signal; the high-speed communication mode switching instruction is used for configuring the configuration parameters of the inbound signal in the high-speed communication mode according to the high-speed communication mode switching instruction when the user machine analyzes the outbound signal to obtain the high-speed communication mode switching instruction.
In one embodiment, the method further comprises the following steps: the user machine carries out signal-to-noise ratio estimation on the outbound signal to obtain a signal-to-noise ratio interval corresponding to the outbound signal; generating a low-speed communication mode switching instruction according to the signal-to-noise ratio interval, and selecting corresponding configuration parameters from a preset transmission strategy table according to the low-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, and information rate.
In one embodiment, the SNR intervals are (-2.7, 0.8), (0.8, 5), (5, 8.9) and (8.9, + ∞), respectively, the configuration parameters corresponding to the (-2.7, 0.8) interval in the transmission strategy table are 1/4Turbo-BPSK-2kbps, the configuration parameters corresponding to the 0.8,5 interval are 1/2Turbo-BPSK-4kbps, the configuration parameters corresponding to the 5,8.9 interval are 1/2Turbo-QPSK-8kbps, the configuration parameters corresponding to the 8.9, + -, interval are 1/2Turbo-16QAM-16kbps, wherein 1/2Turbo and 1/4Turbo represent coding modes, BPSK, QPSK and 16QAM represent modulation modes, and the information rates are represented by 2kbps, 4kbps, 8kbps and 16 kbps.
In one embodiment, the method further comprises the following steps: performing signal-to-noise ratio estimation on an inbound pilot signal sent by a user machine to obtain a signal-to-noise ratio interval corresponding to the inbound pilot signal; generating a high-speed communication mode switching instruction according to the signal-to-noise ratio interval; framing the high-speed communication mode switching instruction in an outbound signal, and sending the outbound signal to a user machine so that the user machine selects corresponding configuration parameters from a preset transmission strategy table according to the high-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, information rate, and access scheme.
In one embodiment, the SNR intervals are (12.64-17.76), (17.76-19.96) and (19.96, + ∞) respectively, the configuration parameters corresponding to the 12.64-17.76 intervals in the transmission strategy table are 16QAM-1/2Turbo-64kbps-CDMA, (the configuration parameters corresponding to the 17.76-19.96 intervals are 256QAM-3/4Turbo-192kbps-CDMA, and the configuration parameters corresponding to the + ∞intervalsare 256 QAM-3/4-384 kbps-FDMA, wherein 1/2Turbo and 3/4Turbo represent coding modes, 16QAM and 256QAM represent modulation modes, 64kbps, 192kbps and 384kbps represent information rates, and CDMA represents access modes.
A variable modulation encoding apparatus suitable for beidou RDSS, the apparatus comprising:
the selection module is used for receiving a communication mode request sent by a user machine; the communication mode request includes: a low-speed communication mode and a high-speed communication mode;
the low-speed communication module is used for sending an outbound signal to the user machine when the communication mode request is in a low-speed communication mode so that the user machine can carry out signal-to-noise ratio estimation on the outbound signal, generating a low-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and framing the low-speed communication mode switching instruction in the inbound signal; the low-speed communication mode switching instruction is used for configuring configuration parameters of the station entering signals in the low-speed communication mode;
the high-speed communication module is used for carrying out signal-to-noise ratio estimation on an inbound pilot signal sent by a user machine when the communication mode request is in a high-speed communication mode, generating a high-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and framing the high-speed communication mode switching instruction in an outbound signal; the high-speed communication mode switching instruction is used for configuring the configuration parameters of the inbound signal in the high-speed communication mode according to the high-speed communication mode switching instruction when the user machine analyzes the outbound signal to obtain the high-speed communication mode switching instruction.
In one embodiment, the low-speed communication module is further configured to perform signal-to-noise ratio estimation on the outbound signal by the user equipment to obtain a signal-to-noise ratio interval corresponding to the outbound signal; generating a low-speed communication mode switching instruction according to the signal-to-noise ratio interval, and selecting corresponding configuration parameters from a preset transmission strategy table according to the low-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, and information rate.
In one embodiment, the high-speed communication module is further configured to perform signal-to-noise ratio estimation on an inbound pilot signal sent by a user equipment, so as to obtain a signal-to-noise ratio interval corresponding to the inbound pilot signal; generating a high-speed communication mode switching instruction according to the signal-to-noise ratio interval; framing the high-speed communication mode switching instruction in an outbound signal, and sending the outbound signal to a user machine so that the user machine selects corresponding configuration parameters from a preset transmission strategy table according to the high-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, information rate, and access scheme.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
receiving a communication mode request sent by a user machine; the communication mode request includes: a low-speed communication mode and a high-speed communication mode;
when the communication mode request is a low-speed communication mode, sending an outbound signal to the user machine so that the user machine carries out signal-to-noise ratio estimation on the outbound signal, generating a low-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and framing the low-speed communication mode switching instruction in an inbound signal; the low-speed communication mode switching instruction is used for configuring configuration parameters of the station entering signals in the low-speed communication mode;
when the communication mode request is in a high-speed communication mode, carrying out signal-to-noise ratio estimation on an inbound pilot signal sent by a user machine, generating a high-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and framing the high-speed communication mode switching instruction in an outbound signal; the high-speed communication mode switching instruction is used for configuring the configuration parameters of the inbound signal in the high-speed communication mode according to the high-speed communication mode switching instruction when the user machine analyzes the outbound signal to obtain the high-speed communication mode switching instruction.
According to the variable modulation coding method, the variable modulation coding device and the variable modulation coding system which are suitable for the Beidou RDSS, when a user machine carries out communication, a communication mode needs to be appointed, so that the communication is carried out according to the corresponding communication mode, the communication mode is divided into a low-speed communication mode and a high-speed communication mode, and under the low-speed communication mode, configuration parameters of an inbound signal are configured adaptively according to the signal-to-noise ratio of the outbound signal. Under the high-speed communication mode, a high-speed communication mode switching instruction is generated according to the signal-to-noise ratio of the inbound pilot signal and is sent to the user machine, and the configuration parameters of the inbound signal are adaptively configured in the user machine according to the high-speed communication mode switching instruction. By the mode, the signal transmission with different transmission rates can be realized under the condition of different signal-to-noise ratios.
Drawings
Fig. 1 is an application scenario diagram of a variable modulation coding method suitable for beidou RDSS in one embodiment;
FIG. 2 is a schematic flow chart of a variable modulation coding method suitable for Beidou RDSS in one embodiment;
FIG. 3 is a block diagram of a variable modulation encoding apparatus suitable for Beidou RDSS in one embodiment;
FIG. 4 is a block diagram showing the structure of a user machine in one embodiment;
FIG. 5 is a block diagram of a central station in one embodiment;
fig. 6 is a block diagram of a variable modulation coding system suitable for beidou RDSS in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The variable modulation coding method suitable for the Beidou RDSS can be applied to the application environment shown in the figure 1. The central station 102 is configured in a ground control center, the user machine 104 is configured in a user segment, and the central station 102 communicates with the user machine 104 through a space segment 106, wherein the communication links are divided into an inbound link and an outbound link, the inbound link refers to a link through which the user machine 104 transmits an inbound signal to the central machine 102, and the outbound link refers to a link through which the central machine 102 transmits an outbound signal to the user machine 104.
In one embodiment, as shown in fig. 2, a variable modulation coding method suitable for beidou RDSS is provided, which is described by taking the method as an example of being applied to the central station in fig. 1, and includes the following steps:
The communication mode request includes: the low-speed communication mode and the high-speed communication mode can be actively selected according to communication requirements when a user communicates.
the low-speed communication mode switching command is used for configuring configuration parameters of the inbound signal in the low-speed communication mode.
Generally speaking, the higher the signal-to-noise ratio, the better the quality of the communication, so before communication, signal-to-noise ratio estimation needs to be performed, for example: if the current signal-to-noise ratio is small, a communication mode with a low transmission rate is selected, after the transmission rate is determined, configuration parameters can be correspondingly selected, and the configuration parameters can be a modulation mode, a coding mode and the like. When the signal to noise ratio is high, a relatively high transmission rate can be selected, and it is worth to say that the relatively high transmission rate is also in the range of low rate, so that the communication mode can be adaptively selected, and the situation that when the selected transmission rate is high, the signal to noise ratio is low is avoided.
And step 206, when the communication mode request is a high-speed communication mode, performing signal-to-noise ratio estimation on the inbound pilot signal sent by the user machine, generating a high-speed communication mode switching instruction according to the signal-to-noise ratio estimation result, and framing the high-speed communication mode switching instruction in the outbound signal.
The high-speed communication mode switching instruction is used for configuring the configuration parameters of the inbound signal in the high-speed communication mode according to the high-speed communication mode switching instruction when the user machine analyzes the outbound signal to obtain the high-speed communication mode switching instruction.
In the variable modulation coding method suitable for the Beidou RDSS, when the user machine carries out communication, a communication mode needs to be appointed, so that the communication is carried out according to the corresponding communication mode, the communication mode is divided into a low-speed communication mode and a high-speed communication mode, and under the low-speed communication mode, configuration parameters of an inbound signal are configured adaptively according to the signal-to-noise ratio of the outbound signal. Under the high-speed communication mode, a high-speed communication mode switching instruction is generated according to the signal-to-noise ratio of the inbound pilot signal and is sent to the user machine, and the configuration parameters of the inbound signal are adaptively configured in the user machine according to the high-speed communication mode switching instruction. By the mode, the signal transmission with different transmission rates can be realized under the condition of different signal-to-noise ratios.
In one embodiment, the user machine carries out signal-to-noise ratio estimation on the outbound signal to obtain a signal-to-noise ratio interval corresponding to the outbound signal; generating a low-speed communication mode switching instruction according to the signal-to-noise ratio interval, and selecting corresponding configuration parameters from a preset transmission strategy table according to the low-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, and information rate.
Specifically, the SNR intervals are (-2.7, 0.8), (0.8, 5), (5, 8.9) and (8.9, + ∞) respectively, the configuration parameters corresponding to the (-2.7, 0.8) interval in the transmission strategy table are 1/4Turbo-BPSK-2kbps, the configuration parameters corresponding to the 0.8,5 interval are 1/2Turbo-BPSK-4kbps, the configuration parameters corresponding to the 5,8.9 interval are 1/2Turbo-QPSK-8kbps, the configuration parameters corresponding to the 8.9, + ∞intervalare 1/2Turbo-16QAM-16kbps, wherein 1/2Turbo and 1/4Turbo represent coding modes, BPSK, QPSK and 16QAM represent modulation modes, and the information rates are represented by 2kbps, 4kbps, 8kbps and 16 kbps.
The transmission policy table in the low-speed communication mode is shown in table 1:
table 1 transmission policy table in low speed communication mode
Wherein Es/N0 represents the signal-to-noise ratio interval.
In this embodiment, the influence of rainfall and ambient factors is comprehensively considered, the channels are divided into 4 states, and the signal-to-noise ratio intervals under the 4 transmission channels are calculated, as shown in table 1. The information transmission strategy ITS is determined, and the information transmission strategy comprises a coding mode, a modulation mode and an information rate. And the user machine selects a corresponding coding mode, a modulation mode and an information rate for information transmission according to the ITS.
In one embodiment, a signal-to-noise ratio estimation is performed on an inbound pilot signal sent by a subscriber unit to obtain a signal-to-noise ratio interval corresponding to the inbound pilot signal; generating a high-speed communication mode switching instruction according to the signal-to-noise ratio interval; framing the high-speed communication mode switching instruction in an outbound signal, and sending the outbound signal to a user machine so that the user machine selects corresponding configuration parameters from a preset transmission strategy table according to the high-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, information rate, and access scheme.
Specifically, the SNR intervals are (12.64-17.76), (17.76-19.96) and (19.96, + ∞) respectively, the configuration parameters corresponding to the 12.64-17.76 intervals in the transmission strategy table are 16QAM-1/2Turbo-64kbps-CDMA, (the configuration parameters corresponding to the 17.76-19.96 intervals are 256QAM-3/4Turbo-192kbps-CDMA, (the configuration parameters corresponding to the 19.96, + ∞) intervals are 256QAM-3/4Turbo-384kbps-FDMA, wherein 1/2Turbo and 3/4Turbo represent coding modes, 16QAM and 256QAM represent modulation modes, 64kbps, 192kbps and 384kbps represent information rates, and CDMA represents access modes.
The transmission policy table in the high-speed communication mode is shown in table 2:
table 2 transmission policy table in high-speed communication mode
In this embodiment, the influence of rainfall and ambient factors is comprehensively considered, channels are divided into 3 states, and signal-to-noise ratio thresholds under the 3 transmission channels are calculated, as shown in table 2. The information transmission strategy ITS is determined, and the information transmission strategy comprises a coding mode, a modulation mode, an information rate, an access mode and subcarrier allocation. Of particular note, there are 23 subcarriers, from sf1 to sf23, where the subcarriers need to be selected as idle and do not have a large impact on other traffic. And the user machine selects a corresponding coding mode, a modulation mode, an information rate, an access mode and a subcarrier to carry out information transmission according to the ITS.
Note that, when communication is performed, for example: in the low-speed communication mode, after configuration is performed in the subscriber unit, framing needs to be performed in the inbound signal so that the central station performs the same configuration for coding and modulation in communication.
In summary, the communication method selects different information transmission strategies ITS including a coding method, a modulation method, an information rate, an access method, and a subcarrier allocation method according to the channel condition by the user equipment. The user machine generates an inbound signal according to the ITS, the Beidou satellite transmits the inbound signal, and the central station demodulates the inbound signal to realize the communication function of the uplink service of the Beidou RDSS. The invention can effectively improve the frequency spectrum utilization rate of the Beidou RDSS system, increase the system throughput and reduce the influence of channel fading fluctuation on the transmission performance of the Beidou RDSS system.
It should be understood that, although the steps in the flowchart of fig. 2 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 2 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 3, there is provided a variable modulation encoding apparatus suitable for beidou RDSS, including: a selection module 302, a low-speed communication module 304, and a high-speed communication module 306, wherein:
a selection module 302, configured to receive a communication mode request sent by a user equipment; the communication mode request includes: a low-speed communication mode and a high-speed communication mode;
a low-speed communication module 304, configured to send an outbound signal to the ue when the communication mode request is in the low-speed communication mode, so that the ue performs signal-to-noise ratio estimation on the outbound signal, generates a low-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and frames the low-speed communication mode switching instruction in an inbound signal; the low-speed communication mode switching instruction is used for configuring configuration parameters of the station entering signals in the low-speed communication mode;
a high-speed communication module 306, configured to perform signal-to-noise ratio estimation on an inbound pilot signal sent by a user equipment when the communication mode request is a high-speed communication mode, generate a high-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and frame the high-speed communication mode switching instruction in an outbound signal; the high-speed communication mode switching instruction is used for configuring the configuration parameters of the inbound signal in the high-speed communication mode according to the high-speed communication mode switching instruction when the user machine analyzes the outbound signal to obtain the high-speed communication mode switching instruction.
In one embodiment, as shown in fig. 4 and fig. 5, which are schematic block diagrams of a user equipment and a central station, respectively, the variable transmission strategy switching unit is configured to select corresponding configuration parameters according to the snr estimation value.
In one embodiment, the low-speed communication module 304 is further configured to perform signal-to-noise ratio estimation on the outbound signal by the user equipment, so as to obtain a signal-to-noise ratio interval corresponding to the outbound signal; generating a low-speed communication mode switching instruction according to the signal-to-noise ratio interval, and selecting corresponding configuration parameters from a preset transmission strategy table according to the low-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, and information rate.
In one embodiment, the SNR intervals are (-2.7, 0.8), (0.8, 5), (5, 8.9) and (8.9, + ∞), respectively, the configuration parameters corresponding to the (-2.7, 0.8) interval in the transmission strategy table are 1/4Turbo-BPSK-2kbps, the configuration parameters corresponding to the 0.8,5 interval are 1/2Turbo-BPSK-4kbps, the configuration parameters corresponding to the 5,8.9 interval are 1/2Turbo-QPSK-8kbps, the configuration parameters corresponding to the 8.9, + -, interval are 1/2Turbo-16QAM-16kbps, wherein 1/2Turbo and 1/4Turbo represent coding modes, BPSK, QPSK and 16QAM represent modulation modes, and the information rates are represented by 2kbps, 4kbps, 8kbps and 16 kbps.
In one embodiment, the high-speed communication module 306 is further configured to perform signal-to-noise ratio estimation on an inbound pilot signal sent by a user equipment, so as to obtain a signal-to-noise ratio interval corresponding to the inbound pilot signal; generating a high-speed communication mode switching instruction according to the signal-to-noise ratio interval; framing the high-speed communication mode switching instruction in an outbound signal, and sending the outbound signal to a user machine so that the user machine selects corresponding configuration parameters from a preset transmission strategy table according to the high-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, information rate, and access scheme.
In one embodiment, the SNR intervals are (12.64-17.76), (17.76-19.96) and (19.96, + ∞) respectively, the configuration parameters corresponding to the 12.64-17.76 intervals in the transmission strategy table are 16QAM-1/2Turbo-64kbps-CDMA, (the configuration parameters corresponding to the 17.76-19.96 intervals are 256QAM-3/4Turbo-192kbps-CDMA, and the configuration parameters corresponding to the + ∞intervalsare 256 QAM-3/4-384 kbps-FDMA, wherein 1/2Turbo and 3/4Turbo represent coding modes, 16QAM and 256QAM represent modulation modes, 64kbps, 192kbps and 384kbps represent information rates, and CDMA represents access modes.
For specific limitations of the variable modulation coding device suitable for the beidou RDSS, reference may be made to the above limitations on the variable modulation coding method suitable for the beidou RDSS, and details are not repeated here. All modules in the variable modulation coding device suitable for the Beidou RDSS can be completely or partially realized through software, hardware and a combination of the software and the hardware. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, as shown in fig. 6, a variable modulation coding system suitable for beidou RDSS is provided, including:
a user machine and a central station;
the user machine is used for sending a communication mode request; the communication mode request includes: a low-speed communication mode and a high-speed communication mode;
when the communication mode request is in a low-speed communication mode, the central station sends outbound information to the user machine, the user machine carries out signal-to-noise ratio estimation on the outbound signal, generates a low-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, frames the low-speed communication mode switching instruction in an inbound signal, and sends the inbound signal; the low-speed communication mode switching instruction is used for configuring configuration parameters of the station entering signals in the low-speed communication mode;
when the communication mode request is in a high-speed communication mode, the central station carries out signal-to-noise ratio estimation on an inbound pilot signal sent by the user machine, generates a high-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and frames the high-speed communication mode switching instruction in an outbound signal; the high-speed communication mode switching instruction is used for configuring the configuration parameters of the inbound signal in the high-speed communication mode according to the high-speed communication mode switching instruction when the user machine analyzes the outbound signal to obtain the high-speed communication mode switching instruction.
In an embodiment, a computer device is provided, comprising a memory storing a computer program and a processor implementing the steps of the method in the above embodiments when the processor executes the computer program.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A variable modulation coding method suitable for Beidou RDSS comprises the following steps:
receiving a communication mode request sent by a user machine; the communication mode request includes: a low-speed communication mode and a high-speed communication mode;
when the communication mode request is a low-speed communication mode, sending an outbound signal to the user machine so that the user machine carries out signal-to-noise ratio estimation on the outbound signal, generating a low-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and framing the low-speed communication mode switching instruction in an inbound signal; the low-speed communication mode switching instruction is used for configuring configuration parameters of the station entering signals in the low-speed communication mode;
when the communication mode request is in a high-speed communication mode, carrying out signal-to-noise ratio estimation on an inbound pilot signal sent by a user machine, generating a high-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and framing the high-speed communication mode switching instruction in an outbound signal; the high-speed communication mode switching instruction is used for configuring the configuration parameters of the inbound signal in the high-speed communication mode according to the high-speed communication mode switching instruction when the user machine analyzes the outbound signal to obtain the high-speed communication mode switching instruction.
2. The method of claim 1, wherein the ue performs snr estimation on the outbound signal, and generates a low speed communication mode switching command according to the snr estimation result, comprising:
the user machine carries out signal-to-noise ratio estimation on the outbound signal to obtain a signal-to-noise ratio interval corresponding to the outbound signal;
generating a low-speed communication mode switching instruction according to the signal-to-noise ratio interval, and selecting corresponding configuration parameters from a preset transmission strategy table according to the low-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, and information rate.
3. The method of claim 2, wherein the signal-to-noise ratio intervals are (-2.7,0.8], (0.8,5], (5,8.9], and (8.9, + ∞ ];
the configuration parameters corresponding to the (-2.7, 0.8) interval in the transmission strategy table are 1/4Turbo-BPSK-2kbps, the configuration parameters corresponding to the 0.8,5 interval are 1/2Turbo-BPSK-4kbps, the configuration parameters corresponding to the 5,8.9 interval are 1/2Turbo-QPSK-8kbps, and the configuration parameters corresponding to the 8.9, + ∞intervalare 1/2Turbo-16QAM-16 kbps;
wherein 1/2Turbo and 1/4Turbo represent coding modes; BPSK, QPSK, and 16QAM represent modulation schemes; 2kbps, 4kbps, 8kbps and 16kbps represent information rates.
4. The method of claim 1, wherein the performing snr estimation on inbound pilot signals transmitted by the subscriber unit, generating a high speed communication mode switching command based on the snr estimation, and framing the high speed communication mode switching command in the outbound signal comprises:
performing signal-to-noise ratio estimation on an inbound pilot signal sent by a user machine to obtain a signal-to-noise ratio interval corresponding to the inbound pilot signal;
generating a high-speed communication mode switching instruction according to the signal-to-noise ratio interval;
framing the high-speed communication mode switching instruction in an outbound signal, and sending the outbound signal to a user machine so that the user machine selects corresponding configuration parameters from a preset transmission strategy table according to the high-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, information rate, and access scheme.
5. The method of claim 4, wherein the SNR intervals are (12.64-17.76), (17.76-19.96), and (19.96, + ∞ ];
in the transmission strategy table, the configuration parameters corresponding to the 12.64-17.76 intervals are 16QAM-1/2Turbo-64kbps-CDMA, the configuration parameters corresponding to the 17.76-19.96 intervals are 256QAM-3/4Turbo-192kbps-CDMA, and the configuration parameters corresponding to the +/-infinity intervals are 256QAM-3/4Turbo-384 kbps-FDMA;
wherein 1/2Turbo and 3/4Turbo represent coding modes; 16QAM and 256QAM denote modulation schemes; 64kbps, 192kbps, and 384kbps represent information rates; CDMA denotes an access scheme.
6. A variable modulation coding device suitable for big dipper RDSS, characterized in that, the device includes:
the selection module is used for receiving a communication mode request sent by a user machine; the communication mode request includes: a low-speed communication mode and a high-speed communication mode;
the low-speed communication module is used for sending an outbound signal to the user machine when the communication mode request is in a low-speed communication mode so that the user machine can carry out signal-to-noise ratio estimation on the outbound signal, generating a low-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and framing the low-speed communication mode switching instruction in the inbound signal; the low-speed communication mode switching instruction is used for configuring configuration parameters of the station entering signals in the low-speed communication mode;
the high-speed communication module is used for carrying out signal-to-noise ratio estimation on an inbound pilot signal sent by a user machine when the communication mode request is in a high-speed communication mode, generating a high-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and framing the high-speed communication mode switching instruction in an outbound signal; the high-speed communication mode switching instruction is used for configuring the configuration parameters of the inbound signal in the high-speed communication mode according to the high-speed communication mode switching instruction when the user machine analyzes the outbound signal to obtain the high-speed communication mode switching instruction.
7. The apparatus of claim 6, wherein the low-speed communication module is further configured to perform signal-to-noise ratio estimation on the outbound signal by the user equipment, so as to obtain a signal-to-noise ratio interval corresponding to the outbound signal; generating a low-speed communication mode switching instruction according to the signal-to-noise ratio interval, and selecting corresponding configuration parameters from a preset transmission strategy table according to the low-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, and information rate.
8. The apparatus of claim 6, wherein the high speed communication module is further configured to perform snr estimation on an inbound pilot signal sent by a subscriber station to obtain an snr interval corresponding to the inbound pilot signal; generating a high-speed communication mode switching instruction according to the signal-to-noise ratio interval; framing the high-speed communication mode switching instruction in an outbound signal, and sending the outbound signal to a user machine so that the user machine selects corresponding configuration parameters from a preset transmission strategy table according to the high-speed communication mode switching instruction; the configuration parameters include: coding scheme, modulation scheme, information rate, and access scheme.
9. The utility model provides a variable modulation coding system suitable for big dipper RDSS which characterized in that includes:
a user machine and a central station;
the user machine is used for sending a communication mode request; the communication mode request includes: a low-speed communication mode and a high-speed communication mode;
when the communication mode request is in a low-speed communication mode, the central station sends an outbound signal to the user machine, the user machine carries out signal-to-noise ratio estimation on the outbound signal, generates a low-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, frames the low-speed communication mode switching instruction in an inbound signal, and sends the inbound signal to the central station; the low-speed communication mode switching instruction is used for configuring configuration parameters of the station entering signals in the low-speed communication mode;
when the communication mode request is in a high-speed communication mode, the central station carries out signal-to-noise ratio estimation on an inbound pilot signal sent by the user machine, generates a high-speed communication mode switching instruction according to a signal-to-noise ratio estimation result, and frames the high-speed communication mode switching instruction in an outbound signal; the high-speed communication mode switching instruction is used for configuring the configuration parameters of the inbound signal in the high-speed communication mode according to the high-speed communication mode switching instruction when the user machine analyzes the outbound signal to obtain the high-speed communication mode switching instruction.
10. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 5 when executing the computer program.
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