CN115765849A - Beidou global short message user access method, system, equipment and medium - Google Patents
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Abstract
The invention discloses a Beidou global short message user access method, a Beidou global short message user access system, beidou global short message user access equipment and a Beidou global short message user access medium.
Description
Technical Field
The invention relates to the technical field of Beidou global short message correlation, in particular to a Beidou global short message user access method, a Beidou global short message user access system, beidou global short message user access equipment and a Beidou global short message user access medium.
Background
The Beidou system can provide high-precision, high-reliability positioning, navigation and time service, and also can provide two-way short message communication service, wherein the short message service comprises global short message service in an on-board processing and re-transferring mode and regional short message service in a transparent forwarding mode. The global short message consists of a space section, a ground section and a user section, wherein the user sends a short message inbound signal through an L frequency band, and the satellite-borne receiver forwards the inbound signal to the ground station through an inter-satellite link after receiving the inbound signal.
At present, the Beidou global short message capacity is limited, only 14 MEO satellites have uplink access capacity of global short messages, about 30 ten thousand times/hour of global short message inbound capacity is realized, and the access requirements of massive Beidou global short message terminals which are distributed all over the world in the future cannot be met far. Even with the upgrade and update of the Beidou third satellite, the 24 MEO satellites can be finally realized to have the global short message capability and can also realize the global short message inbound capability of millions of times/hour at most, which is far away from the massive access requirements of users, and a method for further improving the Beidou global short message access capability when the Beidou constellation architecture, the satellite quantity and the access resources reach the saturated state is lacked.
Disclosure of Invention
The present invention is directed to at least solving the problems of the prior art. Therefore, the invention provides a Beidou global short message user access method, a Beidou global short message user access system, beidou global short message user access equipment and a Beidou global short message user access medium, which can realize data receiving and sending of activated users and improve user access capability of the Beidou global short message.
Acquiring a signal transmitted by a user terminal;
calculating to obtain a baseband signal of the user terminal according to the signal;
calculating to obtain the joint probability density of the user terminal according to the baseband signal;
calculating through a message transmission algorithm according to the joint probability density to obtain a probability model factor graph;
and calculating according to the probability model factor graph to obtain a channel estimated value of the user terminal, and receiving and transmitting data of the user terminal according to the channel estimated value.
According to the embodiment of the invention, at least the following technical effects are achieved:
the method comprises the steps of obtaining signals transmitted by a user terminal, obtaining baseband signals of the user terminal according to signal calculation, obtaining combined probability density of the user terminal according to the baseband signals, obtaining a probability model factor graph according to the combined probability density through a message transmission algorithm, obtaining a channel estimated value of the user terminal according to the probability model factor graph calculation, receiving and sending data of the user terminal according to the channel estimated value, achieving data receiving and sending of an activated user, and improving user access capacity of Beidou global short messages.
According to some embodiments of the invention, said calculating a baseband signal of the user terminal from the signal comprises:
acquiring channel impulse response, delay domain grid parameters and Doppler domain grid parameters when the signals are received;
calculating according to the signal and the channel impulse response to obtain a receiving signal of the user terminal;
performing satellite sampling demodulation according to the received signal to obtain a first baseband signal;
and calculating according to the first baseband signal, the delay domain grid parameters and the Doppler domain grid parameters to obtain the baseband signal.
According to some embodiments of the present invention, the calculation formula for obtaining the received signal of the user terminal by performing the calculation according to the signal and the channel impulse response is as follows:
wherein,
for the device activity indicator function of the kth user terminal,
the probability of the device activity indicator function being 1 for the kth user terminal,
is a value that is much less than 1,
for the baseband received signal of the kth user terminal at time t,
for the signal transmitted from the kth user terminal at time t,
to be at a time delay
The channel impulse response at the doppler frequency v and,
is additive white Gaussian noise with a unilateral power density spectrum of N0,
in order to be a sparse complex coefficient,
the delay on the p path for the k user terminal,
the doppler shift on the p-th path for the k-th user terminal.
According to some embodiments of the present invention, the calculation formula for performing satellite sampling demodulation according to the received signal to obtain the first baseband signal is:
wherein,
for the baseband modulated signal of the kth user terminal,
for the u-th symbol transmitted by the k-th user terminal,
for the mth element in the spreading sequence of the kth user terminal,
for the duration of a single chip, satisfy
T is the time of transmission of a spreading sequence, M is the number of chips in a spreading sequence,
a first baseband signal of the u-th symbol,
for the equivalent channel of all M chips in the u-th received symbol duration,
in order to be a matrix of the transmitted signals,
the signal on the first chip for the u-th user terminal,
is additive white gaussian noise with single-side power density spectrum of N0.
According to some embodiments of the present invention, the calculation according to the first baseband signal, the delay domain grid parameter, and the doppler domain grid parameter is performed to obtain a calculation formula of the baseband signal, where the calculation formula is:
wherein L is the number of delay domain grids,j is the number of grids in the Doppler domain,
in order to delay the parameters of the domain grid,
the power density spectrum is an additive white Gaussian noise with a unilateral power density spectrum of N0.
According to some embodiments of the invention, the calculation formula of the joint probability density calculated according to the baseband signal is:
wherein,
is a conditional gaussian prior probability and is,
mean of 0 and variance of
The circular symmetry of (a) is a complex gaussian distribution,
is a hidden binary variable with the value of 1 or-1,
the function is a dirac trigonometric function,
in order to be a function of the Gamma distribution,
in order to introduce the auxiliary variable(s),
in order to be a function of the joint probability,
is a joint probability density function.
According to some embodiments of the invention, the probabilistic model factor graph includes a linear model and a Markov random field model.
In a second aspect of the present invention, a beidou global short message user access system is provided, which includes:
the transmitting signal acquisition module is used for acquiring a signal transmitted by a user terminal;
a baseband signal calculation module, configured to calculate a baseband signal of the user terminal according to the signal;
a joint probability density calculation module, configured to calculate a joint probability density of the user terminal according to the baseband signal;
the factor graph calculation module is used for calculating through a message transmission algorithm according to the joint probability density to obtain a probability model factor graph;
and the channel pre-estimated value calculation module is used for calculating a channel pre-estimated value of the user terminal according to the probability model factor graph and receiving and transmitting data of the user terminal according to the channel pre-estimated value.
The system obtains the signal transmitted by the user terminal, obtains the baseband signal of the user terminal according to the signal calculation, obtains the joint probability density of the user terminal according to the baseband signal calculation, obtains the probability model factor graph according to the joint probability density through the message transmission algorithm, obtains the channel estimated value of the user terminal according to the probability model factor graph calculation, and receives and transmits the data of the user terminal according to the channel estimated value, realizes the data receiving and transmitting of the active user, and improves the user access capability of the Beidou global short message.
In a third aspect of the present invention, an electronic device for accessing a beidou global short message user is provided, which includes at least one control processor and a memory for communication connection with the at least one control processor; the memory stores instructions executable by the at least one control processor, and the instructions are executed by the at least one control processor to enable the at least one control processor to execute the Beidou global short message subscriber access method.
In a fourth aspect of the present invention, a computer-readable storage medium is provided, where the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are configured to enable a computer to execute the above-mentioned beidou global short message user access method.
It should be noted that the beneficial effects between the second aspect to the fourth aspect of the present invention and the prior art are the same as the beneficial effects between the above-mentioned beidou global short message subscriber access system and the prior art, and will not be described in detail here.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a beidou global short message user access method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a probability model factor graph of a beidou global short message user access method according to an embodiment of the present invention;
fig. 3 is a flowchart of a beidou global short message subscriber access system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, if there are first, second, etc. described, it is only for the purpose of distinguishing technical features, and it is not understood that relative importance is indicated or implied or the number of indicated technical features is implicitly indicated or the precedence of the indicated technical features is implicitly indicated.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to, for example, the upper, lower, etc., is indicated based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that unless otherwise explicitly defined, terms such as setup, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the detailed contents of the technical solutions.
The Beidou system can provide high-precision, high-reliability positioning, navigation and time service, and also can provide two-way short message communication service, wherein the short message service comprises global short message service in an on-board processing and re-transferring mode and regional short message service in a transparent forwarding mode. The global short message consists of a space section, a ground section and a user section, wherein the user sends a short message inbound signal through an L frequency band, and the satellite-borne receiver forwards the inbound signal to the ground station through an inter-satellite link after receiving the inbound signal.
At present, the Beidou global short message has limited capacity, only 14 MEO satellites have uplink access capacity of global short messages, and about 30 ten thousand times/hour of global short message inbound capacity is realized, so that the access requirement of massive Beidou global short message terminals which are distributed all over the world in the future can not be met. Even with the upgrade and update of the Beidou third satellite, the 24 MEO satellites can be finally realized to have the global short message capability and can also realize the global short message inbound capability of millions of times/hour at most, which is far away from the massive access requirements of users, and a method for further improving the Beidou global short message access capability when the Beidou constellation architecture, the satellite quantity and the access resources reach the saturated state is lacked.
In order to solve the technical defects, referring to fig. 1, the invention further provides a beidou global short message user access method, which comprises the following steps:
and step S101, acquiring a signal transmitted by the user terminal.
And step S102, obtaining a baseband signal of the user terminal according to signal calculation.
And step S103, calculating the joint probability density of the user terminal according to the baseband signal.
And step S104, calculating through a message transmission algorithm according to the joint probability density to obtain a probability model factor graph.
And step S105, calculating according to the probability model factor graph to obtain a channel estimated value of the user terminal, and transceiving data of the user terminal according to the channel estimated value.
The method comprises the steps of obtaining signals transmitted by a user terminal, obtaining baseband signals of the user terminal according to signal calculation, obtaining combined probability density of the user terminal according to the baseband signals, obtaining a probability model factor graph according to the combined probability density through a message transmission algorithm, obtaining a channel estimated value of the user terminal according to the probability model factor graph calculation, receiving and sending data of the user terminal according to the channel estimated value, achieving data receiving and sending of an activated user, and improving user access capacity of Beidou global short messages.
In some embodiments, calculating a baseband signal of the user terminal from the signal includes:
acquiring channel impulse response, delay domain grid parameters and Doppler domain grid parameters when receiving signals;
calculating according to the signal and the channel impulse response to obtain a receiving signal of the user terminal;
carrying out satellite sampling demodulation according to the received signal to obtain a first baseband signal;
and calculating according to the first baseband signal, the delay domain grid parameter and the Doppler domain grid parameter to obtain a baseband signal.
In some embodiments, the calculation formula for obtaining the received signal of the user terminal according to the signal and the channel impulse response is:
wherein,
for the device activity indicator function of the kth user terminal,
the probability of the device activity indicator function being 1 for the kth user terminal,
is a value much less than 1 and,
for the baseband received signal of the kth user terminal at time t,
for the signal transmitted from the kth user terminal at time t,
to be in time delay
The channel impulse response at the doppler frequency v and,
is additive white Gaussian noise with a unilateral power density spectrum of N0,
in order to be a sparse complex coefficient,
the delay on the p path for the k user terminal,
the doppler shift on the p-th path for the k-th user terminal.
In some embodiments, the satellite sampling demodulation is performed according to the received signal, and the calculation formula of the first baseband signal is:
wherein,
for the baseband modulated signal of the kth user terminal,
for the u-th symbol transmitted by the k-th user terminal,
for the mth element in the spreading sequence of the kth user terminal,
for the duration of a single chip, satisfy
T is the time of transmission of a spreading sequence, M is the number of chips in a spreading sequence,
a first baseband signal of the u-th symbol,
for the equivalent channel of all M chips in the u-th received symbol duration,
in order to transmit a matrix of signals,
the signal on the first chip for the u-th user terminal,
is additive white Gaussian noise with a unilateral power density spectrum of N0.
In some embodiments, the calculation is performed according to the first baseband signal, the delay domain grid parameter, and the doppler domain grid parameter, and a calculation formula of obtaining the baseband signal is:
wherein L is the number of delay domain grids, J is the number of Doppler domain grids,
in order to delay-domain trellis parameters,
the method is characterized in that the method is a Doppler domain grid parameter, y is a superposed signal of symbols of K users, h is a channel coefficient vector, and w is additive white Gaussian noise with a unilateral power density spectrum of N0.
In some embodiments, the joint probability density is calculated from the baseband signal by the following formula:
wherein,
is a conditional gaussian prior probability and is,
mean of 0 and variance of
The circular symmetry of (a) is a complex gaussian distribution,
is a hidden binary variable with the value of 1 or-1,
the function is a dirac trigonometric function,
in order to be a function of the Gamma distribution,
in order to introduce the auxiliary variable(s),
in order to be a joint probability function,
is a joint probability density function.
Referring to fig. 2, in some embodiments, the probability model factor graph includes a Linear model (Linear Module) and a markov random field model (MRF Module), specifically, the left side is the Linear model mainly used for processing the constraints of the baseband signal calculation formula, and the right side is the markov random field model mainly used for the markov random field prior probability in the joint probability density function calculation formula.
The invention can accurately realize the data receiving and transmitting of the active user through the high-efficiency active user detection and the channel estimation algorithm without increasing too many satellite processing resources under the constraint conditions of limited constellation architecture, satellite quantity, access resources and large time delay and large Doppler frequency shift between the Beidou satellite and the user terminal, thereby further improving the user access capability of the Beidou global short message.
In addition, referring to fig. 3, an embodiment of the present invention provides a beidou global short message user access system, which includes a transmission signal acquisition module 1100, a baseband signal calculation module 1200, a joint probability density calculation module 1300, a factor graph calculation module 1400, and a channel pre-estimation value calculation module 1500, where:
the transmission signal acquiring module 1100 is configured to acquire a signal transmitted by a user terminal;
the baseband signal calculation module 1200 is configured to obtain a baseband signal of the user terminal according to signal calculation;
the joint probability density calculation module 1300 is configured to calculate a joint probability density of the user terminal according to the baseband signal;
the factor graph calculation module 1400 is configured to perform calculation according to the joint probability density through a message passing algorithm to obtain a probability model factor graph;
the channel estimated value calculating module 1500 is configured to calculate a channel estimated value of the user terminal according to the probability model factor graph, and transmit and receive data of the user terminal according to the channel estimated value.
The system obtains the signal transmitted by the user terminal, obtains the baseband signal of the user terminal according to the signal calculation, obtains the joint probability density of the user terminal according to the baseband signal calculation, obtains the probability model factor graph according to the joint probability density through the message transmission algorithm, obtains the channel estimated value of the user terminal according to the probability model factor graph calculation, and receives and transmits the data of the user terminal according to the channel estimated value, realizes the data receiving and transmitting of the active user, and improves the user access capability of the Beidou global short message.
It should be noted that the embodiment of the present system and the embodiment of the system described above are based on the same inventive concept, and therefore, the related contents of the embodiment of the method described above are also applicable to the embodiment of the present system, and are not described herein again.
The application also provides a big dipper global short message user inserts electronic equipment, includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor when executing the computer program implementing: the Beidou global short message user access method is disclosed.
The processor and memory may be connected by a bus or other means.
The memory, as a non-transitory computer-readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer-executable programs. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and these remote memories may be connected to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The non-transitory software programs and instructions required to implement the beidou global short message user access method of the above embodiment are stored in the memory, and when executed by the processor, the beidou global short message user access method of the above embodiment is executed, for example, the method steps S101 to S105 in fig. 1 described above are executed.
The present application further provides a computer-readable storage medium storing computer-executable instructions for performing: the Beidou global short message user access method is disclosed.
The computer-readable storage medium stores computer-executable instructions, which are executed by a processor or controller, for example, by a processor in the above-mentioned embodiment of the electronic device, and enable the processor to execute the beidou global short message subscriber access method in the above-mentioned embodiment, for example, execute the above-described method steps S101 to S105 in fig. 1.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program elements or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program elements, or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as is well known to those of ordinary skill in the art.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A Beidou global short message user access method is characterized by comprising the following steps:
acquiring a signal transmitted by a user terminal;
calculating to obtain a baseband signal of the user terminal according to the signal;
calculating to obtain the joint probability density of the user terminal according to the baseband signal;
calculating through a message transfer algorithm according to the joint probability density to obtain a probability model factor graph;
and calculating according to the probability model factor graph to obtain a channel estimated value of the user terminal, and transceiving data of the user terminal according to the channel estimated value.
2. The beidou global short message user access method according to claim 1, wherein the calculating the baseband signal of the user terminal according to the signal comprises:
acquiring channel impulse response, delay domain grid parameters and Doppler domain grid parameters when the signals are received;
calculating according to the signal and the channel impulse response to obtain a receiving signal of the user terminal;
performing satellite sampling demodulation according to the received signal to obtain a first baseband signal;
and calculating according to the first baseband signal, the delay domain grid parameter and the Doppler domain grid parameter to obtain the baseband signal.
3. The beidou global short message user access method according to claim 2, characterized in that the calculation formula for obtaining the received signal of the user terminal by performing the calculation according to the signal and the channel impulse response is:
wherein,
for the device activity indicator function of the kth user terminal,
the probability of the device activity indicator function being 1 for the kth user terminal,
is a value much less than 1 and,
for the baseband received signal of the kth user terminal at time t,
for the signal transmitted from the kth user terminal at time t,
to be at a time delay
The channel impulse response at the doppler frequency v and,
is additive white Gaussian noise with a unilateral power density spectrum of N0,
in order to be a sparse complex coefficient,
the delay on the p path for the kth user terminal,
the doppler shift on the p-th path for the k-th user terminal.
4. The Beidou global short message user access method according to claim 3, wherein the calculation formula for obtaining the first baseband signal by performing satellite sampling demodulation according to the received signal is as follows:
wherein,
for the baseband modulated signal of the kth user terminal,
for the u-th symbol transmitted by the k-th user terminal,
for the mth element in the spreading sequence of the kth user terminal,
for the duration of a single chip, satisfy
T is the time of transmission of a spreading sequence, M is the number of chips in a spreading sequence,
a first baseband signal of the u-th symbol,
for the equivalent channel of all M chips in the u-th received symbol duration,
in order to be a matrix of the transmitted signals,
the signal on the first chip for the u-th user terminal,
additive Gaussian white with single-sided power density spectrum of N0And (3) noise.
5. The Beidou global short message user access method according to claim 4, wherein the calculation according to the first baseband signal, the delay domain grid parameter and the Doppler domain grid parameter is performed to obtain the baseband signal with a calculation formula:
wherein L is the number of delay domain grids, J is the number of Doppler domain grids,
in order to delay-domain trellis parameters,
the power density spectrum is an additive white Gaussian noise with a unilateral power density spectrum of N0.
6. The Beidou global short message user access method according to claim 5, wherein the calculation formula for obtaining the joint probability density according to the baseband signal is as follows:
wherein,
is a conditional gaussian prior probability that,
mean of 0 and variance of
The circular symmetry of (a) is a complex gaussian distribution,
is a hidden binary variable with the value of 1 or-1,
the function is a dirac trigonometric function,
in order to be a function of the Gamma distribution,
in order to introduce the auxiliary variable(s),
in order to be a joint probability function,
is a joint probability density function.
7. The Beidou global short message user access method according to claim 6, wherein the probabilistic model factor graph comprises a linear model and a Markov random field model.
8. The utility model provides a big dipper global short message user access system which characterized in that is applied to the main satellite, big dipper global short message user access system includes:
the transmitting signal acquisition module is used for acquiring a signal transmitted by a user terminal;
a baseband signal calculation module, configured to calculate a baseband signal of the user terminal according to the signal;
a joint probability density calculation module, configured to calculate a joint probability density of the user terminal according to the baseband signal;
the factor graph calculation module is used for calculating through a message transfer algorithm according to the joint probability density to obtain a probability model factor graph;
and the channel pre-estimated value calculation module is used for calculating a channel pre-estimated value of the user terminal according to the probability model factor graph and receiving and transmitting data of the user terminal according to the channel pre-estimated value.
9. The Beidou global short message user access equipment is characterized by comprising at least one control processor and a memory which is in communication connection with the at least one control processor; the memory stores instructions executable by the at least one control processor to enable the at least one control processor to perform a beidou global short message subscriber access method as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium characterized by: the computer-readable storage medium stores computer-executable instructions for causing a computer to perform a beidou global short message subscriber access method as claimed in any one of claims 1 to 7.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20120098612A1 (en) * | 2009-06-26 | 2012-04-26 | Giulio Colavolpe | Reduced complexity fdm-cpm dectector with multiple access interference cancellation |
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