CN113708822B - Communication link modeling simulation system - Google Patents

Communication link modeling simulation system Download PDF

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CN113708822B
CN113708822B CN202110883703.3A CN202110883703A CN113708822B CN 113708822 B CN113708822 B CN 113708822B CN 202110883703 A CN202110883703 A CN 202110883703A CN 113708822 B CN113708822 B CN 113708822B
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CN113708822A (en
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王忠华
周武旸
任伟龙
鲁先龙
李刚
章仁飞
周骏
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CETC 38 Research Institute
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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
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18515—Transmission equipment in satellites or space-based relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/345—Interference values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
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Abstract

The invention discloses a communication link modeling simulation system, which belongs to the technical field of satellite communication and comprises a beam judgment module, a link budget module, an interference analysis module, a strategy simulation module and a conflict monitoring and solving module, wherein the beam judgment module judges whether a user is shielded by the earth according to the position of the user to obtain an included angle between the user and a beam center and whether the current beam working identifier exists, and inputs the included angle and the current beam working identifier into the link budget module; the link budget module obtains the current Ec/N0 of the user and inputs the current Ec/N0 into the interference analysis module; the interference analysis submodule finally obtains the current Eb/N0 of the user, and a table is looked up to obtain the corresponding theoretical BER output; and the strategy simulation analysis module optimizes the modulation mode and EIRP of the user when the BER can not meet the requirement. The conflict resolution module provides a resolution by analyzing the disturbed type of the current user through the conflict monitoring and conflict resolution module. The invention comprehensively considers the influence of a plurality of parameters on the link budget, and judges whether extra interference is generated and provides a solution by comparing a BER curve graph by using Ec/N0 under the condition of no interference calculated by the link budget.

Description

Communication link modeling simulation system
Technical Field
The invention relates to the technical field of satellite communication, in particular to a communication link modeling simulation system.
Background
In recent years, with the increase of a large number of networking devices and the difficulty of effective coverage of a ground wireless network in a part of regions, satellite communication can be used as an effective supplement to the ground network due to the characteristics of large satellite communication coverage area, capability of being combined with various multiple access technologies to form a communication network, wide communication frequency band, large capacity and the like. Therefore, the system simulation of the satellite communication under different coding modulation modes of each frequency band can verify and simulate the system communication capacity and the communication effectiveness before the satellite is transmitted.
In a satellite communication system, for a specific carrier frequency, different spreading, coding, modulation modes and the like have different signal-to-noise ratio requirements to achieve the communication error rate standard. Therefore, for different spreading, coding and modulation modes, providing a communication link modeling simulation system capable of judging and solving the link problem is a technical problem to be solved urgently. Therefore, a communication link modeling simulation system is proposed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to judge and solve the link problem through modeling simulation under different spreading, coding and modulation modes provides a communication link modeling simulation system. The modeling simulation system carries out simulation analysis on user requirements and multi-user interference, and channel characteristics take simulation analysis of multiple access links of S and Ka frequency bands as input; analyzing and optimizing resource allocation and scheduling user tasks according to the link conflict condition; establishing a complete relay satellite user use strategy simulation analysis system, accurately predicting the interference between users, reducing the interference between users by adopting technologies such as spread spectrum communication, code division multiple access, polarization isolation and the like, and ensuring the normal communication of the users; calculating the relation between the BER (bit error rate) of the communication system and the signal-to-noise ratio and the relation between the BER of the communication system and the link margin aiming at different parameters such as modulation/demodulation, coding, transmission rate, whether spread spectrum exists or not, polarization and the like; and determining a used BER curve according to the communication mode and the signal characteristics of the target user, and finding an interference threshold angle according to the entrance signal-to-noise ratio of the relay satellite.
The invention solves the technical problem through the following technical scheme that the system comprises a beam judgment module, a link budget module, an interference analysis module, a strategy simulation module and a conflict monitoring and solving module;
the beam judgment module is used for selecting a target beam, judging whether a user is positioned in the current beam or not, judging whether the user is shielded by the earth or not, and calculating to obtain the included angle between the user and the beam center and whether the user works in the current beam or not;
the link budget module is used for carrying out link budget on the users with the determined relationship between the users and the satellite beams and calculating the current Ec/N0 of the users;
the interference analysis module is used for carrying out interference calculation on all interference users in the same wave beam of a target user according to the antenna polarization type and the interference type of the user, calculating the current Eb/N0 of the user, and looking up a table to obtain the corresponding theoretical BER output;
the strategy simulation module optimizes the modulation mode and EIRP of the target user when the BER can not meet the requirement;
and the conflict monitoring and solving module analyzes the disturbed type of the current user and provides a solution.
Furthermore, an included angle between the user and the beam center, namely an included angle between a normalized vector pointed by the beam center of the synchronous satellite and a position normalized vector from the satellite to the user, is determined that the user is not shielded by the earth or shielded by the earth in the target beam according to the input effective width of the beam when the included angle is smaller than the effective width of the beam; otherwise, the user is considered to be outside the target beam.
Furthermore, the state identifiers of whether to work in the current beam are respectively 0, -1 and 1, the user with the state identifier of 0 is a non-working user of the current beam, the user with the state identifier of 1 is a user who normally works in the current beam, the user with the state identifier of-1 is a user who is shielded by the earth, and the user with the state identifier of 0 and the user with the state identifier of 1 both generate interference to the selected target user.
Further, when performing link budget, the calculation formula is as follows:
pathloss＝92.44+20log10(d sat2user )+20log10(f c /10 9 )
Figure GDA0003991598510000021
wherein: pathloss is the path loss; fc is the user center frequency in Hz; EIRP is the omnidirectional transmitting power of a user antenna, and the unit is dBm; antGain is the satellite antenna gain and is obtained by an antenna directional diagram; G/T is the gain temperature ratio; rc is the user code rate; l0 is other losses; the boltzmann constant was converted to-198.6.
Furthermore, the polarization types of the user transmitting antenna are linear polarization and circular polarization, and 3dB of polarization isolation can be generated in different polarization modes in the same frequency band.
Further, the linear polarization is divided into horizontal polarization and vertical polarization, and polarization isolation of 30dB is generated between the horizontal polarization and the vertical polarization, and the circular polarization is divided into left-hand polarization and right-hand polarization, and polarization isolation of 30dB is also generated between the left-hand polarization and the right-hand polarization.
Further, the type of interference experienced by the user is frequency division multiple access interference or code division multiple access interference.
Further, for frequency division multiple access interference, the interference power is obtained as the product of the average power spectrum of the interfering users and the interference bandwidth, taking into account the overlapping frequency band bandwidths of the target user and the interfering users.
Furthermore, for the CDMA interference, when the number of the interference users is less than 10, the ratio of the superposed interference user power to Rc/Rb is used as the total interference power; when the number of the interference users is more than 10, carrying out Gaussian equivalent analysis on the interference, and carrying out Gaussian equivalent analysis on the interference, wherein the formula is as follows:
Figure GDA0003991598510000031
where r is the code rate, N is the spreading ratio, K represents the total number of users,
Figure GDA0003991598510000032
which is indicative of the signal-to-noise ratio,
Figure GDA0003991598510000033
the power of the ith interfering user, P represents the common signal power.
Furthermore, the modulation mode of the target user is optimized, namely high-order modulation is optimized to low-order modulation, and the EIRP optimization mode is to increase the EIRP of the target user until the BER requirement is finally met.
Compared with the prior art, the invention has the following advantages: the communication link modeling simulation system comprehensively considers the influence of a plurality of parameters on the link budget, judges whether extra interference is generated or not by comparing the Ec/N0 under the condition of no interference calculated by the link budget and the BER curve chart, and is worthy of popularization and application.
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Fig. 1 is a block diagram of a communication link modeling simulation system in an embodiment of the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
As shown in fig. 1, the present embodiment provides a technical solution: a communication link modeling simulation system, comprising the following modules:
a beam judgment module:
the module has the main functions of selecting a target beam and judging whether a user is positioned in the current beam; if the user is positioned in the beam, returning the status identifier to be 1, otherwise, returning the status identifier to be 0; and meanwhile, judging whether the user is shielded by the earth, judging whether a direct path exists from the satellite coordinates to the ground station, and if the direct path exists, returning the state identifier to be-1. All users with the state identification of 1 are users which normally work in the current wave beam, and users with the state identification of 0 are non-working users of the current wave beam, and the two types of users can generate interference on the selected target user;
specifically, an included angle between a normalization vector pointed by the center of a synchronous satellite beam and a position normalization vector from a satellite to a user is calculated, and according to the input effective width of the beam, when the included angle is smaller than the effective width of the beam, it is determined that the user is in a target beam (the state identifier is 1), and the user is possibly shielded by the earth (the state identifier is-1); otherwise, the user is considered to be out of the target beam (the state is marked as 0);
and then inputting the relationship between the user and the satellite beam at the current moment and the current state identification of the user into a subsequent module so as to carry out interference analysis.
A link budget module:
performing link budget on the user with the determined user and satellite beam relationship according to the following formula:
pathloss＝92.44+20log10(d sat2user )+20log10(f c /10 9 )
Figure GDA0003991598510000041
wherein: pathloss is the path loss; fc is the user center frequency in Hz; EIRP is the omnidirectional transmitting power of a user antenna, and the unit is dBm; antGain is the satellite antenna gain and is obtained by an antenna directional diagram; G/T is the gain temperature ratio; rc is the user code rate; l0 is other losses; the boltzmann constant is converted to-198.6;
the current Ec/N0 of all users, namely the ratio of the chip signal power to the noise power, is calculated by a link budget module. Inputting the data into an interference analysis module;
an interference analysis module:
the interference analysis module carries out interference calculation on all interference users (whether the interference users are working users in the current wave beam or not) in the same wave beam of a target user, and simultaneously calculates the ratio of interference power to signal power in dB by considering the antenna polarization type and the interference type of the users, namely if the interference power is equal to the user power, the output is 0dB;
the polarization types of a user transmitting antenna are linear polarization and circular polarization, and 3dB polarization isolation can be generated in the same frequency band and different polarization modes; the linear polarization is horizontal polarization and vertical polarization, the horizontal polarization and the vertical polarization can generate polarization isolation of 30dB, the circular polarization is left-hand polarization and right-hand polarization, and the polarization isolation of 30dB is also formed between the left-hand polarization and the right-hand polarization; and determining whether the user is subjected to frequency division multiple access interference or code division multiple access interference according to whether the user is subjected to spread spectrum, working frequency, bandwidth and other parameters. For frequency division multiple access interference, the overlapping frequency band bandwidth of a target user and an interference user is considered, and interference power is obtained according to the product of the average power spectrum of the interference user and the interference bandwidth. For code division multiple access interference, when the number of interference users is less than 10, the ratio of the superposed interference user power to Rc/Rb is used as the total interference power; when the number of the interference users is more than 10, carrying out Gaussian equivalent analysis on the interference, wherein the formula is as follows:
Figure GDA0003991598510000051
where r is the code rate, N is the spreading ratio, K represents the total number of users,
Figure GDA0003991598510000052
which is indicative of the signal-to-noise ratio,
Figure GDA0003991598510000053
the power of the ith interfering user, P, represents the common signal power.
After obtaining the interference power, the Eb/(Ib + N0) of each user is calculated as SINR (signal to interference plus noise ratio) output, and then the corresponding BER output is found from the BER theoretical graph.
A strategy simulation analysis module:
considering that when the BER cannot meet the requirement, the modulation mode of the target user is optimized first, and high-order modulation (8 PSK or QPSK) is optimized to low-order modulation (BPSK). And then based on different coding BER theoretical graphs, optimizing a coding modulation mode with lower BER on the premise of the same SINR.
If the BER is still not lower than 10e-6 after the above process, the target user EIRP (equivalent isotropic radiated power) is continuously increased until the BER requirement (lower than 10 e-6) is finally reached. The EIRP is automatically increased by 5dB at a time, the upper limit is 100dB (both can be modified), and the increase is stopped if the target user still cannot work normally. It should be noted that the power increase of the target user may have a great influence on other users in the same beam, and should be used with caution.
A conflict monitoring and conflict resolution module:
a conflict monitoring module: the device is used for monitoring the states of the interfered type (non-interference, frequency division multiple access interference, code division multiple access interference), SINR, BER and the like of the current user and deciding whether to trigger the conflict resolution module.
A conflict resolution module: providing a conflict solution, and inputting the conflict solution into a strategy simulation analysis module; and then, the strategy simulation module synthesizes the interference analysis result to obtain a new user strategy.
The working principle is as follows:
firstly, a beam judgment module calculates the central position of a beam based on the satellite position and the beam direction by utilizing input user, satellite and link relation information, finds out all users in the coverage range of the current beam, judges whether the users are shielded by the earth according to the user position, obtains the included angle between the users and the beam center and whether the users work in the current beam or not, and inputs the included angle and the working identifier into a link budget module; the link budget module calculates path loss according to the distance between a user and a satellite and the working frequency of the user, obtains the current Ec/N0 of the user by combining antenna directional diagram gain, user speed, other losses and the like, and inputs the current Ec/N0 into the interference analysis module; the interference analysis module firstly judges whether the user is frequency division or code division according to the relationship between the symbol rate and the code rate of the user, calculates the interference generated by frequency overlapping on the frequency division user, calculates the spread spectrum interference on the code division user, finally obtains the current Eb/N0 of the user, and obtains the corresponding theoretical BER output by looking up a table; the strategy simulation analysis module firstly judges whether the BER meets the requirement, if not, the modulation mode of the target user is optimized, and then the coding mode is optimized; if BER is still larger than the set value through the steps, increasing EIRP of the target user, increasing a quantitative value each time, and if the BER still cannot normally work when reaching the upper limit, stopping increasing; the conflict monitoring and conflict solving module monitors states of the disturbed type, SINR, BER and the like of the current user and determines whether to trigger the conflict solving module; if a conflict occurs, the conflict resolution module provides a conflict resolution.
In summary, the communication link modeling simulation system according to the above embodiment can determine whether a plurality of users conflict according to a BER corresponding to a theoretical Eb/N0 of a link budget and an actual BER, so as to determine a conflict type, and provide a corresponding conflict solution, which is worth to be popularized and used.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A communication link modeling simulation system characterized by: the system comprises a beam judgment module, a link budget module, an interference analysis module, a strategy simulation module and a conflict monitoring and solving module;
the beam judgment module is used for selecting a target beam, judging whether a user is positioned in the current beam or not, judging whether the user is shielded by the earth or not, and calculating to obtain the included angle between the user and the beam center and whether the user works in the current beam or not;
the link budget module is used for carrying out link budget on the users with the determined relationship between the users and the satellite beams and calculating the current Ec/N0 of the users;
the interference analysis module is used for carrying out interference calculation on all interference users in the same wave beam of a target user according to the antenna polarization type and the interference type of the user, calculating the current Eb/N0 of the user, and looking up a table to obtain the corresponding theoretical BER output;
the strategy simulation module is used for optimizing the modulation mode and EIRP of the user when the BER can not meet the requirement;
the conflict monitoring and resolving module comprises a conflict monitoring module and a conflict resolving module, wherein the conflict monitoring module is used for monitoring the disturbed type of the current user and determining whether to trigger the conflict resolving module, and the conflict resolving module is used for providing a conflict resolving scheme and inputting the scheme into the strategy simulation analysis module.
2. The communication link modeling simulation system of claim 1, wherein: the method comprises the steps that an included angle between a user and a beam center, namely an included angle between a normalized vector pointed by the beam center of a synchronous satellite and a position normalized vector from the satellite to the user, is determined, and when the included angle is smaller than the effective width of the beam according to the input effective width of the beam, the user is not shielded by the earth or shielded by the earth in a target beam; otherwise, the user is considered to be outside the target beam.
3. The communication link modeling simulation system of claim 2, wherein: the state identifications of whether the current beam works are respectively 0, -1 and 1, the user with the state identification of 0 is a non-working user of the current beam, the user with the state identification of 1 is a user who normally works in the current beam, the user with the state identification of-1 is a user who is shielded by the earth, and the user with the state identification of 0 and the user with the state identification of 1 can generate interference on the selected target user.
4. The communication link modeling simulation system of claim 1, wherein: when the link budget is carried out, the calculation formula is as follows:
pathloss＝92.44+20log10(d sat2user )+20log10(f c /10 9 )
Figure FDA0003991598500000011
wherein: pathloss is the path loss; fc is the user center frequency in Hz; EIRP is the omnidirectional transmitting power of a user antenna, and the unit is dBm; antGain is the satellite antenna gain and is obtained by an antenna directional diagram; G/T is the gain temperature ratio; rc is the user code rate; l0 is other losses; the boltzmann constant was converted to-198.6.
5. The communication link modeling simulation system of claim 1, wherein: the polarization types of the user transmitting antenna are linear polarization and circular polarization, and 3dB polarization isolation can be generated in different polarization modes in the same frequency band.
6. The communication link modeling simulation system of claim 5, wherein: the linear polarization is horizontal polarization and vertical polarization, polarization isolation of 30dB can be generated between the horizontal polarization and the vertical polarization, the circular polarization is divided into left-hand polarization and right-hand polarization, and polarization isolation of 30dB also exists between the left-hand polarization and the right-hand polarization.
7. The communication link modeling simulation system of claim 6, wherein: the interference type suffered by the user is frequency division multiple access interference or code division multiple access interference.
8. The communication link modeling simulation system of claim 7, wherein: for frequency division multiple access interference, the overlapping frequency band bandwidth of a target user and an interference user is considered, and the interference power is obtained according to the product of the average power spectrum of the interference user and the interference bandwidth.
9. The communication link modeling simulation system of claim 7, wherein: for code division multiple access interference, when the number of interference users is less than 10, the ratio of the superposed interference user power to Rc/Rb is used as the total interference power; when the number of the interference users is more than 10, carrying out Gaussian equivalent analysis on the interference, wherein the formula is as follows:
Figure FDA0003991598500000021
where r is the code rate, N is the spreading ratio, K represents the total number of users,
Figure FDA0003991598500000022
which is indicative of the signal-to-noise ratio,
Figure FDA0003991598500000023
representing the power of the i-th interfering user and P the common signal power.
10. The communication link modeling simulation system of claim 1, wherein: and optimizing the modulation mode of the target user, namely optimizing high-order modulation to low-order modulation, wherein the EIRP optimization mode is to increase the EIRP of the target user until the BER requirement is finally met.
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