CN113676246A

CN113676246A - Performance evaluation method, system and medium for satellite-ground converged network transmission link

Info

Publication number: CN113676246A
Application number: CN202110946262.7A
Authority: CN
Inventors: 王学玲; 李志强
Original assignee: Space E Star Communication Technology Co ltd
Current assignee: Space E Star Communication Technology Co ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2021-11-19
Anticipated expiration: 2041-08-18
Also published as: CN113676246B

Abstract

The invention discloses a performance evaluation method, a system and a medium for satellite-ground fusion network transmission links, wherein the method comprises the following steps: comparing the signal-to-interference-and-noise ratio of the direct transmission link in the satellite-ground fusion network with a preset reference value, and determining the direct transmission link or the relay link in the satellite-ground fusion network as a transmission link according to a comparison result, so that the computation complexity of system implementation is reduced, and the system performance of the satellite-ground fusion network under multi-relay multi-link transmission and the high-complexity computation degree of system implementation are balanced; after the transmission link is determined, the throughput of the transmission link is calculated according to the signal-to-interference-and-noise ratio of the transmission link, the complexity of throughput calculation can be reduced, the system performance of the selected transmission link is quantitatively evaluated based on the throughput, the calculation difficulty of the quantitative evaluation of the system performance is further reduced, and the performance of the system can be accurately evaluated.

Description

Performance evaluation method, system and medium for satellite-ground converged network transmission link

Technical Field

The present application relates to the field of communications, and in particular, to a method, a system, and a medium for evaluating performance of a satellite-ground converged network transmission link.

Background

With the development of satellite communication technology, the popularization of satellite communication is accelerating, and satellite televisions and satellite handheld terminals are mature in succession and applied to communication transmission. In a wireless communication system satellite, mobile communication and ground mobile communication are used as two leading technologies of communication technology, a satellite communication network and a ground mobile communication network are fused and cooperatively operated, and all-weather smoothness and all-region coverage of a high-speed mobile internet can be realized.

In the satellite-ground converged ground relay terminal network, a plurality of ground relay terminals can bring better system performance relative to a single ground relay terminal. If all terrestrial repeaters in the satellite beam participate in the cooperative transmission, the system implementation complexity is high. In this context, a relay selection strategy is generally employed to balance the complexity of the system and the system performance.

In the prior art, a ground relay terminal selection strategy in a satellite-ground convergence network is as follows: and the full relay participation scene under the condition of multiple relays in the satellite-ground fusion network is obtained, and an accurate expression of traversal capacity and the multi-relay multi-user satellite-ground fusion network are obtained. However, although the performance of the system is improved to some extent by the participation of multiple relays in cooperative transmission, the computational complexity of the system is high, and the performance of the system and the complexity of system implementation cannot be balanced. Moreover, the quantitative evaluation of the system performance also depends on the calculation of the system, and the calculation difficulty of the quantitative evaluation of the system performance is increased by the high-complexity system calculation, so that the performance is difficult to quantitatively and accurately evaluate.

Disclosure of Invention

Based on the above, the embodiments of the present invention provide a performance evaluation method, system and medium for a satellite-ground converged network transmission link, so as to solve the technical problem in the prior art that how to reduce the calculation difficulty of quantitative evaluation of system performance and accurately and quantitatively evaluate system performance because a plurality of ground relay terminals participate in cooperative transmission based on a satellite-ground converged network.

In order to solve the above technical problem, an embodiment of the present application provides a performance evaluation method for a satellite-ground converged network transmission link, and a specific technical solution is as follows:

the satellite-ground converged network comprises a satellite destination end, a handset source end and a plurality of ground relay ends, wherein the satellite destination end receives an uplink signal transmitted by the handset source end to form a direct transmission link between the handset source end and the satellite destination end; the satellite destination receives uplink signals transmitted from the handset source to the plurality of terrestrial relay terminals and assisted by the plurality of terrestrial relay terminals to form a plurality of relay links between the handset source and the satellite destination, wherein the method for evaluating the performance of the transmission links comprises the following steps:

the signal-to-interference-and-noise ratio of the direct transmission link in the satellite-ground fusion network is compared with a preset reference value gamma₀Comparing the sizes of the satellite-ground converged networks, and determining a direct transmission link or a relay link in the satellite-ground converged network as a transmission link according to a comparison result; and calculating the throughput of the transmission link according to the signal-to-interference-and-noise ratio of the transmission link, and analyzing the performance of the selected transmission link based on the throughput.

Preferably, the step of calculating the throughput of the transmission link according to the signal-to-interference-and-noise ratio of the transmission link includes:

if the transmission link is the direct transmission link, the signal to interference plus noise ratio of the direct transmission link is used as the signal to interference plus noise ratio of the transmission link, the interruption probability of the direct transmission link is calculated based on the signal to interference plus noise ratio, and a first parameter L is obtained₁(ii) a The first parameter L is measured₁Substituting the throughput expression of the direct transmission link for calculation to obtain the throughput of the direct transmission link as T ═ R_s×[1-L₁]Where T is the throughput of the direct link, R_sIs a preset transmission rate; if the transmission link is the relay link, calculating to obtain an accurate closed expression of the throughput of the relay link based on the signal-to-interference-and-noise ratio of the relay link, and obtaining the throughput of the relay link as

Wherein T is the throughput of the relay link, R_sIs a predetermined transmission rate, L₁Is a first parameter, L₂Is a second parameter, L₃Is the third parameter.

Preferably, the step of analyzing the performance of the selected transmission link based on the throughput comprises:

acquiring the throughput of the transmission link under different signal to interference and noise ratios, and generating a throughput signal to interference and noise ratio curve according to the throughput under different signal to interference and noise ratios; and analyzing the performance of the transmission link at different throughputs based on the throughput signal-to-interference-and-noise ratio curve.

Preferably, the signal-to-interference-and-noise ratio of the direct transmission link is compared with the preset reference value γ₀The step of comparing the magnitudes of (a) and (b) comprises:

and receiving a source signal sent by the source end of the handset and interference signals sent by interference stations in the ground environment where the plurality of ground relay ends are located, and obtaining the signal-to-interference-and-noise ratio of the direct transmission link.

Preferably, the step of determining, according to the comparison result, the direct link or the relay link in the satellite-ground converged network as the transmission link includes:

if the comparison result is that the signal to interference plus noise ratio of the direct transmission link is smaller than the preset reference value, determining a target relay link from the plurality of relay links as the transmission link; and if the comparison result is that the signal to interference plus noise ratio of the direct transmission link is greater than or equal to the preset reference value, determining the direct transmission link as the transmission link.

Preferably, the step of determining a target relay link from the plurality of relay links as the transmission link includes:

calculating the signal-to-interference-and-noise ratio gamma of the first hop link between the source end of the handset and the ith ground relay end_1iAnd the signal-to-interference-and-noise ratio gamma of a second hop link between the ith terrestrial relay terminal and the satellite destination terminal_2i(ii) a Wherein, i is more than or equal to 1 and less than or equal to N1, and N1 represents the number of ground relay terminals; comparing the signal-to-interference-and-noise ratio gamma of the first hop link corresponding to the ith ground relay terminal_1iAnd the signal-to-interference-and-noise ratio gamma of the second hop link_2iThe smaller value of the two is selected as the signal to interference plus noise ratio gamma of the relay link corresponding to the ith ground relay terminal_i＝min(γ_1i，γ_2i) (ii) a Similarly, calculating the signal-to-interference-and-noise ratios of relay links corresponding to the N1 ground relay terminals respectively: gamma ray₁，γ₂，......，γ_i，......，γ_N1Then, select from themTaking the maximum value as the target signal-to-interference-and-noise ratio gamma_obj＝max(γ₁，γ₂，......，γ_i，......，γ_N1) (ii) a The target signal-to-interference-and-noise ratio gamma is measured_objAnd the corresponding relay link is used as a target relay link, and the target relay link is determined as the transmission link.

calculating the signal-to-interference-and-noise ratio gamma of the first hop link between the source end of the handset and the ith ground relay end_1iWherein, i is more than or equal to 1 and less than or equal to N1, and N1 represents the number of ground relay terminals; similarly, calculating the signal-to-interference-and-noise ratio γ of the first hop link in the relay links respectively corresponding to the N1 terrestrial relay terminals₁₁，γ₁₂，......，γ_1i，......，γ_1N1Then, the maximum value is selected as the reference signal-to-interference-and-noise ratio gamma_ref＝max(γ₁₁，γ₁₂，......，γ_1i，......，γ_1N1) (ii) a The reference signal-to-interference-and-noise ratio gamma is measured_refAnd the corresponding relay link is used as a target relay link, and the target relay link is determined as the transmission link.

Preferably, the step of setting the target relay link as the transmission link is followed by:

determining a signal-to-interference-and-noise ratio (SINR) gamma of a first hop link in the target relay link_zj1(ii) a Determining a signal-to-interference-and-noise ratio gamma of a second hop link in the target relay link_zj2(ii) a The signal-to-interference-and-noise ratio gamma of a first hop link in the target relay link is determined_zj1Signal to interference plus noise ratio gamma with the second hop link in the target relay link_zj2And comparing, taking the minimum value as the signal to interference plus noise ratio of the target relay link, and expressing as: gamma ray_srd＝min(γ_zj1，γ_zj2) (ii) a Further obtaining the signal-to-interference-and-noise ratio of a transmission link of the satellite-ground converged network system as follows:

preferably, another embodiment of the present invention provides a performance evaluation system for a satellite-ground converged network transmission link, where the performance evaluation system for the satellite-ground converged network transmission link includes a satellite destination terminal, a handset source terminal, and a plurality of ground relay terminals;

the satellite destination end can receive an uplink signal from the handset source end to form a direct transmission link between the handset source end and the satellite destination end in the performance evaluation system of the satellite-ground fusion network transmission link;

or, the satellite destination receives uplink signals transmitted from the handset source to the plurality of terrestrial relay terminals and assisted by the plurality of terrestrial relay terminals to form a plurality of relay links between the handset source and the satellite destination in the performance evaluation system of the satellite-terrestrial converged network transmission link;

the satellite destination comprises a memory, a processor and a performance evaluation program of the transmission link of the satellite-ground converged network, which is stored on the memory and can run on the processor, and when being executed by the processor, the performance evaluation program of the transmission link of the satellite-ground converged network realizes the steps of the method proposed by the embodiment.

Preferably, another embodiment of the present invention provides a medium, on which a performance evaluation program of a satellite-ground converged network transmission link is stored, and when being executed by a processor, the performance evaluation program of the satellite-ground converged network transmission link implements the steps of the method proposed by the above embodiment.

The embodiment of the application has the following beneficial effects: the invention discloses a performance evaluation method, a system and a medium for a satellite-ground fusion network transmission link, wherein a relay selection strategy is adopted in a multi-ground relay multi-link selection system of the satellite-ground fusion network to determine an optimal transmission link, so that the computation complexity of system realization can be reduced even if a plurality of ground relays participate in cooperative transmission in the satellite-ground fusion network, and the performance of the system and the high-complexity computation degree of system realization are balanced; after the optimal transmission link is determined, calculating the signal-to-interference-and-noise ratio of the transmission link by utilizing a beam forming maximum ratio combining technology and a maximum ratio transmitting technology; the throughput of the transmission link is calculated according to the determined signal-to-interference-and-noise ratio of the transmission link, the complexity of calculation of the throughput can be reduced, the system performance of the selected transmission link is quantitatively evaluated based on the throughput, the calculation difficulty of quantitative evaluation of the system performance is reduced, and the performance can be quantitatively and accurately evaluated.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic flowchart of a first embodiment of a method for evaluating performance of star-earth converged network transmission links according to the present invention;

FIG. 2 is a schematic diagram of a transmission link system model of the satellite-ground convergence network of the present invention;

FIG. 3 is a flowchart illustrating another embodiment of a method for evaluating performance of star-earth converged network transmission links according to the present invention;

FIG. 4 is a flowchart illustrating another embodiment of a method for evaluating performance of star-earth converged network transmission links according to the present invention;

FIG. 5 is a schematic flow chart of a further implementation of the embodiment of FIG. 4;

FIG. 6 is a flowchart illustrating another embodiment of a method for evaluating performance of star-earth converged network transmission links according to the present invention;

FIG. 7 is a graph of throughput versus performance for transmission links of the satellite-to-ground converged network of the present invention at different SINR;

fig. 8 is a schematic structural diagram of a satellite destination of a performance evaluation system of a satellite-ground converged network transmission link in a hardware operating environment according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," and any variations thereof, as appearing in the specification, claims and drawings of this application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.

For a better understanding of the above technical solutions, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Referring to fig. 1, a first embodiment of the present invention provides a flowchart of a performance evaluation method for satellite-ground converged network transmission links. In this embodiment, the performance evaluation method for the satellite-ground converged network transmission link includes the following steps:

step S10, the signal-to-interference-and-noise ratio of the direct transmission link in the satellite-ground fusion network and a preset reference value gamma₀Comparing the sizes of the satellite-ground converged networks, and determining a direct transmission link or a relay link in the satellite-ground converged network as a transmission link according to a comparison result; wherein, if the signal-to-interference-and-noise ratio of the direct transmission link is less than the preset reference value gamma₀Step S11 is executed, and if the signal to interference plus noise ratio of the direct link is greater than or equal to the set reference value, step S12 is executed.

Step S20, calculating the throughput of the transmission link according to the signal to interference plus noise ratio of the transmission link, and analyzing the performance of the selected transmission link based on the throughput.

With reference to fig. 2, the research environment of this embodiment is a satellite-ground convergence network under multiple ground relays, in a system model of the satellite-ground convergence network, one satellite beam may cover multiple ground relay stations or terminals, and a satellite destination terminal D receives an uplink signal transmitted by the handset source terminal S to form a direct link between the handset source terminal S and the satellite destination terminal D; and the satellite destination terminal D receives uplink signals transmitted to the plurality of ground relay terminals by the handset source terminal S and assisted by the plurality of ground relay terminals R to form a plurality of relay links between the handset source terminal S and the satellite destination terminal D.

In the embodiment shown in fig. 1, before analyzing the performance of the transmission link, the transmission link of the satellite-ground converged network is determined; receiving a signal sent from a handset source end S at a satellite destination end D to calculate the signal-to-interference-and-noise ratio of a direct transmission link, comparing the calculated signal-to-interference-and-noise ratio of the direct transmission link with a preset reference value, and if the signal-to-interference-and-noise ratio of the direct transmission link is smaller than a preset reference value gamma₀And selecting a ground relay terminal to assist the transmission of the satellite signal, namely determining a target relay link from the plurality of relay links as a transmission link. And calculating the throughput according to the determined signal-to-interference-and-noise ratio of the transmission link, and evaluating the performance of the selected transmission link based on the throughput.

Preferably, the embodiment of fig. 1 is further described with reference to fig. 2. Preferably, the transmission link system of the satellite-ground converged network in the embodiment of the invention comprises a satellite destination terminal D, a handset source terminal S and a plurality of ground relay terminals R; the satellite destination terminal D can receive an uplink signal from the handset source terminal S to form a direct transmission link between the handset source terminal and the satellite destination terminal in the transmission link system of the satellite-ground converged network; or, the satellite destination D receives the uplink signal transmitted from the handset source S to the plurality of terrestrial relay nodes R and assisted by the plurality of terrestrial relay nodes R to form a plurality of relay links between the handset source and the satellite destination in the transmission link system of the satellite-terrestrial converged network, and may further select a relay link with the largest signal-to-interference-and-noise ratio from the plurality of relay links as an optimal relay link or a target relay link between the handset source, the terrestrial relay node, and the satellite destination.

Preferably, the performance evaluation method for the satellite-ground converged network transmission link in this embodiment is applied to transmission link selection under uplink multiple antennas and multiple relays in the satellite-ground converged network, and a system model of the satellite-ground converged network, as shown in fig. 2, includes a handset source S with a single antenna, a satellite destination D, and N1 ground relay terminals configured with N2 antennas, that is, each ground relay terminal is configured with N2 antennas, so that the ground relay terminals can realize multi-set reception based on multiple antennas.

Preferably, in the satellite-ground converged network system model according to the embodiment of the present invention, M1 and M2 single-antenna interference stations respectively interfere with the ground relay node R and the satellite destination node D.

Preferably, in step S10, the signal to interference plus noise ratio of the direct link is compared with a preset reference value γ by checking the signal to interference plus noise ratio of the direct link at the satellite destination₀And comparing the sizes to determine the transmission link of the satellite-ground converged network.

Preferably, before determining the transmission link selection, the satellite destination D first calculates the signal-to-interference-and-noise ratio of the direct transmission link of the system model for comparison with the preset reference value γ₀The comparison is performed and the transmission link is selected. The transmission link is a signal transmission channel between the satellite destination end D and the handset source end S.

Preferably, the method for determining the signal-to-interference-and-noise ratio of the direct transmission link includes: and the satellite destination terminal D receives the source signal sent by the handset source terminal S and the interference signals sent by the interference stations in the ground environment where the plurality of ground relay terminals are located, and calculates the source signal and the interference signals to obtain the signal-to-interference-and-noise ratio of the direct transmission link.

If the signal emitted from the source end S of the handset is x_s(t) and a modulus value of 1, i.e., E [ | x_s(t)|²]1, satelliteThe destination terminal D directly receives the signal transmitted upstream from the handset source terminal S, wherein the received signal (1):

wherein, P_sDenotes the transmission power, h, of the source S_sdRepresenting the channel fading component, P, between the source S and destination D, subject to a shaded Rice distribution_jdRepresents the power g from the jth co-channel interference to the satellite destination D_jdAnd a channel fading component representing that the j-th interference to the satellite destination D obeys the shaded Rice distribution. x is the number of_jd(t) denotes signals emanating from j co-channel interferers and E [ | x [ ]_jd(t)|²]＝1，n_d(t) represents additive white Gaussian noise at the destination D and satisfies

δ_dThe gaussian white noise power of the satellite destination D is shown, and M2 shows the number of interferers interfering with the satellite destination D.

Preferably, the signal to interference plus noise ratio of the direct transmission link transmitting end of the satellite-ground converged network system can be calculated as follows:

wherein,

λ_sdrepresenting the signal-to-noise ratio, λ, of the direct link_jdRepresenting the signal-to-noise ratio of the interfering link; p_sRepresenting the transmission power of the handset source S, hsd representing the channel fading component between the handset source S and the satellite destination D, subject to a shadowy Rice distribution, P_jdRepresents the power, g, of the jth co-channel interference from the interfering station to the satellite destination D_idRepresents the channel fading component, delta, of the jth co-channel interference to the satellite destination end D obeying the shadow Rice distribution_dWhite gaussian noise representing satellite destination DThe power, M2, represents the number of co-channel interferers interfering with the satellite destination D.

Preferably, the satellite destination D receives the signal sent from the handset source S and the co-channel interference signal sent from the interference station to calculate the sir of the direct link, and compares the calculated sir of the direct link with a preset reference value γ₀And comparing the sizes of the satellite-ground converged networks, and judging whether the transmission link of the satellite-ground converged network is a direct transmission link or a relay link according to the comparison result, so that the determination of the transmission link of the satellite-ground converged network is realized.

And step S11, determining a target relay link from the plurality of relay links as the transmission link.

And step S12, determining the direct transmission link as the transmission link.

Preferably, the research environment of this embodiment is a satellite-ground convergence network under multiple ground relays, in a system model of the satellite-ground convergence network, one satellite beam may cover multiple ground relay terminals, and a satellite destination terminal D receives an uplink signal transmitted by the handset source terminal S to form a direct link between the handset source terminal S and the satellite destination terminal D; and the satellite destination terminal D receives uplink signals transmitted to the plurality of ground relay terminals R by the handset source terminal S and assisted by the plurality of ground relay terminals R to form a plurality of relay links between the handset source terminal S and the satellite destination terminal D. In the mobile communication process, a plurality of ground relay terminals R transmit to bring better system performance, and simultaneously, all the ground relay terminals R in the satellite beam participate in cooperative transmission, so the system complexity is very high. The signal-to-interference-and-noise ratio of a direct transmission link in the satellite-ground converged network is compared with a preset reference value gamma₀The size of the satellite-ground converged network is compared, and the optimal link is determined to be used as a transmission link in the satellite-ground converged network according to the comparison result, so that the complexity and the system performance of the system are balanced. Receiving a signal sent from a handset source end S at a satellite destination end D to calculate the signal-to-interference-and-noise ratio of a direct transmission link, comparing the calculated signal-to-interference-and-noise ratio of the direct transmission link with a preset reference value, and if the signal-to-interference-and-noise ratio of the direct transmission link is smaller than a preset reference value gamma₀One terrestrial repeater R is selected to assist in the transmission of the satellite signal, i.e. from a plurality of repeater linksThe target relay link is determined as the transmission link.

Preferably, for step S11, the method for determining the target relay link from the plurality of relay links as the transmission link includes at least two implementation methods, which are specifically described below with reference to fig. 3 and 4, respectively.

First, a first implementation method is shown in fig. 3:

step S111, calculating the signal-to-interference-and-noise ratio gamma of the first hop link between the source end of the handset and the ith ground relay end_1iAnd the signal-to-interference-and-noise ratio gamma of a second hop link between the ith terrestrial relay terminal and the satellite destination terminal_2i(ii) a Wherein, i is more than or equal to 1 and less than or equal to N1, and N1 represents the number of ground relay terminals;

step S112, comparing the signal-to-interference-and-noise ratio gamma of the first hop link corresponding to the ith ground relay terminal_1iAnd the signal-to-interference-and-noise ratio gamma of the second hop link_2iThe smaller value of the two is selected as the signal to interference plus noise ratio gamma of the relay link corresponding to the ith ground relay terminal_i＝min(γ_1i，γ_2i)；

Step S113, according to the methods in steps S111 and S112, calculating the signal to interference plus noise ratios of the relay links corresponding to the N1 ground relay terminals:

γ₁，γ₂，.....，γ_i，.....，γ_N1，

then, the maximum value is selected as the target signal-to-interference-and-noise ratio gamma_obj＝max(γ₁，γ₂，......，γ_i，......，γ_N1)；

Step S114, the target signal-to-interference-and-noise ratio gamma is processed_objAnd the corresponding relay link is used as a target relay link, and the target relay link is determined as the transmission link.

Preferably, for each terrestrial relay node R, the signal transmission channel between the terrestrial relay node R and the handset source node S is the first hop link of the relay link, and the signal transmission channel from the terrestrial relay node R to the satellite destination node D is the second hop link of the relay link. Thus, for each relay link, a first hop link and a second hop link are included.

Preferably, in conjunction with fig. 2, for the first hop link, the handset source transmits the signal to the ith terrestrial relay R_iWherein, i is more than or equal to 1 and less than or equal to N1, N1 represents the number of ground relay terminals, the ith ground relay terminal R_iThe received signal represents:

wherein, P_sRepresenting the transmit power of the handset source S,

representing the handset source S to the ith terrestrial repeater R_iOf the channel fading vector, W₁Denotes the ith terrestrial repeater terminal R_iAnd satisfies | | w₁||²The signal emitted by the handset source S is x ═ 1_s(t)，P_ξiIs the interference power of the ξ ground interference at the ith ground relay terminal Ri,

indicating the xi ground interference to the ith ground relay terminal R_iChannel fading vector, x, between_ξi(t) denotes at the ith terrestrial relay terminal R_iIs processed by an interference signal from the xi ground interference

n_ir(t) denotes at the ith terrestrial relay terminal R_iAnd satisfies the additive white gaussian noise vector of order N2 × 1

Wherein, delta_rGaussian white noise Power, I, representing the ground Relay node R_N2×1The matrix is an N2 × 1 unit column matrix, M1 represents the number of interference interfering with the terrestrial relay node R, and N2 represents the number of antennas disposed at the terrestrial relay node. Wherein H is a tableThe conjugate transpose of the matrix vector is shown.

Preferably, according to the ith terrestrial relay terminal R_iThe received signal can calculate the ith ground relay terminal R corresponding to the relay link_iThe signal to interference plus noise ratio of the first hop link at (b). Ith ground relay terminal R_iThe signal-to-interference-and-noise ratio of the corresponding first-hop link represents:

wherein, P_sRepresenting the transmit power of the handset source S,

representing the handset source S to the ith terrestrial repeater R_iOf the channel fading vector, w₁Denotes the ith terrestrial repeater terminal R_iAnd satisfies | | w₁||²＝1，P_ξiIs the xi ground interference at the ith ground relay terminal R_iThe power of the interference at (a) is,

indicating the xi ground interference to the ith ground relay terminal R_iChannel fading vector between, n_ir(t) denotes at the ith terrestrial relay terminal R_iAnd satisfies the additive white gaussian noise vector of order N2 × 1

Wherein, delta_rGaussian white noise Power, I, representing the ground Relay node R_N2×1The matrix is an unit column matrix of N2 × 1, M1 represents the number of interference interfering with the terrestrial relay terminal R, N2 represents the number of antennas disposed at the terrestrial relay terminal, and H represents the conjugate transpose of the matrix vector.

Preferably, in conjunction with fig. 2, for the second hop link, the ith terrestrial relay terminal R_iTransmitting the received signal to the satellite destination D, whereby the received signal at the satellite destination D represents:

wherein Pr represents the power of the signal at the terrestrial repeater terminal R,

denotes the ith terrestrial repeater terminal R_iChannel fading vector to satellite destination D and satisfies the shadowed Rice distribution, w₂Is the ith ground relay terminal R_iA transmit beamforming vector of

The signal emitted by the source end S of the handset is x_s(t)，P_jdRepresents the power g from the jth co-channel interference to the satellite destination D_jdRepresenting the channel fading component of the jth interference to satellite destination terminal D obeying the shaded Rice distribution, M2 representing the interference number of the interference satellite destination terminal D, x_jd(t) denotes signals emanating from j co-channel interferers and E [ | x [ ]_jd(t)|²]＝1，n_d(t) represents additive white Gaussian noise at the destination D and satisfies

δ_dAnd H represents the conjugate transpose of the matrix vector.

Preferably, the ith ground relay terminal R can be calculated_iThe signal-to-interference-and-noise ratio of the second hop link at the satellite destination D is:

wherein, P_rRepresents the power of the signal at the terrestrial repeater terminal R,

P_jdRepresents the power g from the jth co-channel interference to the satellite destination D_jdRepresenting the channel fading component of the j interference to the satellite destination D obeying the shaded Rice distribution, M2 representing the interference number of the interference satellite destination D, n_d(t) represents additive white Gaussian noise at the destination D and satisfies

δ_dAnd H represents the conjugate transpose of the matrix vector.

Preferably, according to the ith terrestrial relay terminal R_iThe received signal can be calculated by the ith ground relay terminal R of the relay link_iSignal to interference and noise ratio gamma of_1iAccording to the ith terrestrial relay terminal R_iThe ith ground relay terminal R can be obtained by calculating the received signal_iSignal to interference plus noise ratio at satellite destination D is gamma_2iPreferably, in combination with the decode-and-forward protocol, the value with the minimum signal-to-interference-and-noise ratio in the two-hop link is the final signal-to-interference-and-noise ratio of the link, and then the ith terrestrial relay node R_iThe ith signal to interference plus noise ratio of the formed ith relay link is as follows:

γ_i＝min(γ_1i，γ_2i)

wherein, γ_1iIth ground relay terminal R_iSignal to interference and noise ratio, gamma, of the first hop link of (1)_2iDenotes the ith terrestrial repeater terminal R_iThe signal to interference plus noise ratio of the second hop link at the destination D.

Preferably, the signal-to-interference-and-noise ratios, such as γ, of the relay links corresponding to the N1 terrestrial relay terminals are calculated₁、γ₂、……γ_i……、γ_N1Will be gamma₁、γ₂、……γ_i……、γ_N1Comparing the two values to obtain the maximum value gamma_maxThe maximum value gamma is set_maxIs determined as a target signal to interference plus noise ratio gamma_obj＝max(γ₁，γ₂，......，γ_i，......，γN1)。

Preferably, the signal-to-interference-and-noise ratios of all relay links are compared with the target signal-to-interference-and-noise ratio gamma_objAnd comparing, wherein the relay link corresponding to the target signal-to-interference-and-noise ratio is the target relay link, and determining the target relay link as the transmission link of the satellite-ground converged network.

In the first method, each relay link is divided into two-hop links, a first-hop link is respectively corresponding to a position between a handset source end S and a ground relay end R, a second-hop link is corresponding to a position between the ground relay end R and a satellite destination end D, the two-hop links form a relay link, the signal-to-interference-and-noise ratio of the relay link is determined by the signal-to-interference-and-noise ratio of the first-hop link and the signal-to-interference-and-noise ratio of the second-hop link, so that the signal-to-interference-and-noise ratios corresponding to the two-hop links are calculated respectively, and then a smaller value of the calculated signal-to-interference-and-noise ratios is obtained by comparison to serve as the signal-to-interference-and-noise ratio of the relay link, which is finally determined by the minimum signal-to-interference-and-noise ratio in each hop link formed by the relay link. After the signal-to-interference-and-noise ratios of the relay links corresponding to each ground relay terminal are obtained, the signal-to-interference-and-noise ratios of the relay links are compared, the maximum value is selected, and the corresponding relay link is the target relay link. Therefore, the method needs to calculate the signal-to-interference-and-noise ratio corresponding to the two-hop link included in each relay link, and the calculation amount is large.

It should be noted that, in addition to calculating and comparing the maximum signal to interference and noise ratios in the first hop links and the second hop links of all the relay links, the present embodiment may also calculate and comparing the maximum signal to interference and noise ratios in the first hop links of all the relay links.

Preferably, a second method is implemented, as in fig. 4:

step S115, calculating the signal-to-interference-and-noise ratio gamma of the first hop link between the source end of the handset and the ith ground relay end_1iWherein, i is more than or equal to 1 and less than or equal to N1, and N1 represents the number of ground relay terminals;

step S116, according to the method of step S115, N1 are calculatedThe signal-to-interference-and-noise ratio gamma of the first hop link in the relay links respectively corresponding to the ground relay terminals₁₁，γ₁₂，......，γ_1i，......，γ_1N1Then, the maximum value is selected as the reference signal-to-interference-and-noise ratio gamma_ref＝max(γ₁₁，γ₁₂，......，γ_1i，......，γ_1N1)；

Step S117, the reference signal to interference plus noise ratio gamma_refAnd the corresponding relay link is used as a target relay link, and the target relay link is determined as the transmission link.

Preferably, the invention adopts a time multiplexing signal transmission mode, and when the signal-to-interference-and-noise ratio of the direct transmission link is less than a preset reference value gamma₀In time, the satellite destination D assists in receiving the signal transmitted from the handset source S by means of the terrestrial relay R, and the signal transmission phase from the handset source to the satellite destination D requires two slot phases, a first slot phase and a second slot phase. In the first time slot stage, starting from a first ground relay terminal R1, respectively calculating the signal-to-interference-and-noise ratio of each relay link at the ground relay terminal R based on a signal sent by a handset source terminal S, and comparing the calculated signal-to-interference-and-noise ratios of the relay links at the ground relay terminal R, wherein the ground relay terminal with the largest signal-to-interference-and-noise ratio is a target ground relay terminal. After the target ground relay terminal is determined, the signal to interference plus noise ratio corresponding to the second hop link can be further calculated by the second time slot stage of the target relay link transmission corresponding to the target ground relay terminal.

Preferably, in the first time slot phase, the handset source S transmits signals to a plurality of terrestrial relay nodes R, and then the ith terrestrial relay node R_iThe signal interference noise ratio is sent to the ith ground relay terminal R through the receiving handset source terminal S_iThe signal of the ith ground relay terminal is calculated to obtain the signal to interference and noise ratio gamma of the ith ground relay terminal_1i(ii) a Calculating the SINR of other ground relay terminals by the same method, comparing the calculated SINRs, and determining the largest SINR among the RSRs as the largest SINR among multiple ground relay terminalsAnd the maximum signal-to-interference-and-noise ratio is the signal-to-interference-and-noise ratio of the first hop link of the relay link.

Preferably, referring to fig. 5, after the signal to interference plus noise ratio of the first hop link is obtained, a ground relay corresponding to the maximum signal to interference plus noise ratio of the first hop link among the plurality of ground relays is searched, and the searched ground relay is used as a target ground relay. And determining a target relay link from the plurality of relay links according to the target ground relay terminal, wherein the target relay link is a transmission link of the satellite-ground converged network. Specifically, the step of setting the target relay link as the transmission link includes:

step S1171, determining the signal-to-interference-and-noise ratio gamma of the first hop link in the target relay link_zj1(ii) a The specific calculation method comprises the ith ground relay terminal R_iThe method for calculating the sir of the corresponding first hop link is not described herein again.

Step S1172, determining the signal-to-interference-and-noise ratio gamma of the second hop link in the target relay link_zj2(ii) a The specific calculation method comprises the ith ground relay terminal R_iThe method for calculating the signal-to-interference-and-noise ratio of the corresponding second hop link is not described herein again.

Step S1173, the signal to interference plus noise ratio gamma of the first hop link in the target relay link is determined_zj1Signal to interference plus noise ratio gamma with the second hop link in the target relay link_zj2And comparing, and taking the minimum value as the signal-to-interference-and-noise ratio of the target relay link, wherein the minimum value can be expressed as:

γ_srd＝min(γ_zj1，γ_zj2)

step S1174, preferably, the signal to interference plus noise ratio reaching the satellite destination end by combining the direct link of the satellite-ground converged network system is γ_sdFurther, the signal-to-interference-and-noise ratio of the transmission link finally determined by the satellite-ground converged network system can be obtained as follows:

compared with the first method, the second method only needs to calculate the signal-to-interference-and-noise ratio of the first hop link for each relay link, and then selects the maximum value from the signal-to-interference-and-noise ratios of the first hop links by comparing the signal-to-interference-and-noise ratios of the first hop links, and the relay link corresponding to the maximum value is used as the target relay link. The method omits the calculation and comparison of the SINR of the second hop link in the relay links, because the SINR from the ground relay terminals R to the same satellite destination terminal D can be covered by the same satellite beam, the SINR from the ground relay terminals R to the satellite destination terminal D is close to or consistent, or can share the SINR of the same second hop link, and the SINR of the first hop link between the handset source terminal and the ground relay terminals plays a main role, so the SINR can be obtained only by calculating and comparing the SINR of the first hop link in the relay links. Therefore, compared with the first method, the second method has the advantages that the calculation amount is obviously reduced, and the implementation is more convenient and faster.

Preferably, after determining the transmission links of the satellite-ground converged network, in step S20, the throughput of the transmission links is calculated according to the signal-to-interference-and-noise ratios of the transmission links, and the performance of the selected transmission links is analyzed based on the throughput.

Preferably, the signal-to-interference-and-noise ratio is output according to the satellite-ground converged network system

And calculating the throughput of the transmission link, and analyzing the performance of the selected transmission link based on the throughput.

In the satellite-ground converged network of the embodiment, a relay selection strategy is adopted to determine a transmission link, and under the condition that a plurality of ground relays participate in cooperative transmission, the computational complexity of system implementation is reduced, so that the performance of the system and the high-complexity computational complexity of system implementation are balanced; after the transmission link is determined, the signal to interference and noise ratio of the relay link can be calculated. And then, the throughput of the transmission link is calculated according to the determined signal-to-interference-and-noise ratio of the transmission link, so that the complexity of calculating the throughput can be reduced, the system performance of the selected transmission link is quantitatively evaluated based on the throughput, the calculation difficulty of quantitatively evaluating the system performance is reduced, and the performance can be quantitatively and accurately evaluated.

Referring to fig. 6, another embodiment of the method for evaluating performance of a satellite-ground converged network transmission link, in which the step of calculating throughput of the transmission link according to the signal-to-interference-and-noise ratio of the transmission link includes:

step S21, if the transmission link is a direct transmission link, the signal to interference plus noise ratio of the direct transmission link is used as the signal to interference plus noise ratio of the transmission link, and the interruption probability of the direct transmission link is calculated based on the signal to interference plus noise ratio to obtain a first parameter L₁；

Step S22, the first parameter L is set₁Substituting the throughput into the throughput expression of the direct transmission link to calculate to obtain that the throughput of the direct transmission link is T-R_s×[1-L₁]Where T is the throughput of the direct link, R_sIs a preset transmission rate;

step S23, if the transmission link is a relay link, calculating to obtain an accurate closed expression of the throughput of the relay link based on the signal-to-interference-and-noise ratio of the relay link, and obtaining the throughput of the relay link as

Preferably, the outage probability is defined as the final signal to interference plus noise ratio from the satellite destination D to the handset source S being less than a preset reference value γ₀The throughput is defined as the capability of transmitting a certain amount of data on the transmission link of the satellite-ground converged network at a preset transmission rate, and the performance of the transmission link can be judged according to the throughput of the transmission link of the satellite-ground converged network. After determining the transmission link, the embodiment analyzes the performance of the selected transmission link through the throughput. Specifically, if the transmission link is a direct transmission link, the signal to interference plus noise ratio γ of the direct transmission link is determined_sdAnd as the signal-to-interference-and-noise ratio of the transmission link, calculating the throughput of the direct transmission link based on the signal-to-interference-and-noise ratio, and further analyzing the performance of the selected transmission link based on the throughput.

If the transmission link is a relay link, the signal to interference plus noise ratio gamma of the relay link is determined_srdAnd as the signal-to-interference-and-noise ratio of the transmission link, calculating the throughput of the relay link based on the signal-to-interference-and-noise ratio of the relay link, and analyzing the performance of the selected transmission link based on the throughput.

Preferably, when all satellite links h_kWhen the shaded rice distribution is obeyed, the ith element component is expressed as:

[h_k]_i＝Ye^jθ+Ze^jξ

where γ and Z represent the amplitude of the scatter and line-of-sight components, respectively, subject to Rayleigh and Nakagami-m distributions, respectively. Further θ represents the random phase, subject to a uniform distribution of (0, 2 π), and ξ is the determined phase of the line-of-sight link.

When the satellite link follows the shadow Rice distribution, the signal-to-noise ratio lambda of the direct transmission link_sdIs expressed as:

wherein,

Ω₀，2b₀，m₀≧ 0 represents the power of the line-of-sight component, the power of the multipath component, and the fading parameter from 0 to ∞. 1F₁(-,) represents the confluent hyper-geometric function. When m is₀When it is an integer, 1F₁(m₀；1；δ₀λ_sd) Can be expressed as:

wherein,

is a pochmammer symbol. Will be provided with

Signal-to-noise ratio lambda of medium available direct transmission link_sdThe probability density function of (a):

wherein,

eyes of a user

Is the average signal-to-noise ratio of the direct link.

Meanwhile, the signal-to-noise ratio lambda of the direct transmission link can be obtained_sdCumulative distribution function of (2):

preferably, when the link from the relay R to the satellite D has the same channel parameters, the signal-to-noise ratio λ of the link from the relay R to the satellite D can be obtained_2iProbability density function of (1):

wherein,

represents the average signal-to-noise ratio, m, of the ith relay link to the destination satellite D₁Represents a fading parameter from 0 to ∞ and B (,) represents a Beta function.

Preferably, the signal-to-noise ratio λ of the link relaying R to the satellite D is obtained_2iCumulative distribution function of (2):

preferably, when the links of the interfering satellites in the relay link also have the same channel parameters, the signal-to-noise ratio λ of the links of the interfering satellites in the relay link is_JdThe probability density function of (a):

preferably, the signal-to-noise ratio λ of the link in the link interfering with the satellite_JdCumulative distribution function of (2):

preferably, the signal-to-noise ratio λ of the transmission link from the source S to the relay R₁Probability density function of (1):

wherein l is ∈ {1, Jr },

ρ(A_l) Is a matrix A_lThe number of different independent diagonal elements of (a),

is that

Number of heavy roots, x_i，j(A_l) Is a of a matrix_lThe (i, j) th characteristic coefficient of (1).

Preferably, the signal-to-noise ratio λ of the transmission link from the source S to the relay R is obtained₁Cumulative distribution function of (2):

preferably, according to the definition of the interruption probability: and obtaining the probability that the final end-to-end signal-to-interference-and-noise ratio is smaller than a preset reference value, and obtaining an accurate closed expression of the interruption probability:

P_out(γ₀)＝Pr(γ_e≤γ₀)

preferably, if the transmission link is a direct transmission link, a first accurate closed-type expression of the interruption probability of the direct transmission link is obtained according to the definition of the interruption probability of the direct transmission link:

P_out(γ₀)＝Pr(γ_sd≤γ₀)

preferably, P is aided by the signal to interference and noise ratio of the direct link_out(γ₀)＝P_r(γ_sd≤γ₀) Can be converted into:

wherein A is＝γ₀，B＝γ₀Setting a first parameter L₁，P_r(γ_sd≤γ₀)＝L₁The result of the calculation then equals the first parameter L₁。

Preferably, the cumulative distribution function of the signal-to-interference-and-noise ratio of the direct transmission link

Probability density function of signal-to-interference-and-noise ratio of male interference link

Is substituted into

The calculation can obtain:

preferably, the following can be obtained by simplifying and finishing:

preferably, the function H (n, μ) is defined as:

preferably, the definition function H (n, μ) is substituted into L₁In (1), the calculation can yield:

thus, the interruption probability of the direct transmission link is obtained:

P_out(γ₀)＝L₁

wherein L is₁Is the first parameter.

Preferably, according to the definition of throughput: ability to transmit a certain amount of data over a transmission link of a satellite-to-ground converged network at a preset transmission rate, whereby a third exact closed form expression T ═ R of throughput can be derived_s×P_r(γ_sd＞γ₀) Converting the third exact closed-form expression may result in:

T＝R_s×[1-P_out(γ₀)]

wherein R is_sIs a predetermined transmission rate, P_out(γ₀) Is the probability of interruption of the transmission link.

Preferably, after obtaining the outage probability of the transmission link, the first parameter L is used₁Substituting the third accurate closed expression of the throughput of the direct transmission link to calculate the throughput of the direct transmission link:

T＝R_s×[1-L₁]

wherein R is_sIs a predetermined transmission rate, L₁Is the first parameter.

Preferably, if the transmission link is a relay link, according to the definition of the interruption probability: the final signal-to-noise ratio from the satellite destination terminal D to the handheld terminal S is less than the preset reference value gamma₀By means of the SINR output by the satellite-to-ground converged network system

A second exact closed-form expression of the outage probability of the relay link can be obtained:

P_out(γ₀)＝P_r(γ_sd≤γ₀，γ_srd≤γ₀)

by making P pairs_out(γ₀)＝P_r(γ_sd≤γ₀，γ_srd≤γ₀) Further development, we can get:

P_out(γ₀)＝Pr(γ_sd≤γ₀)-Pr(γ₁＞γ₀)P_r(γ_sd≤γ₀，γ₂＞γ₀)

preferably, the relay link according to this embodiment is used as a transmission link, so γ of the first hop link of the relay link₁Cumulative distribution function of (2):

preferably, when all satellite links obey the independent and identically distributed shaded Rice channels, the cumulative distribution function formula of the first hop link of the relay link

The transformation is carried out to obtain:

preferably, the ith relay R is obtained according to the first slot stage of the relay link_iCan calculate the signal-to-interference-and-noise ratio

By the ith ground relay terminal R_iThe signal-to-interference-and-noise ratio of the first hop link is transformed to obtain:

wherein, C ═ γ₀And D ═ γ₀°

Preferably, the pair of the probability density function and the cumulative distribution function based on the signal-to-noise ratio of the first hop link of the relay link

Is converted to further obtain

Preferably, the following equation is obtained by performing integral expansion on the equation:

will define the function, C ═ y₀And D ═ γ₀Bringing in

And calculating to obtain:

will be provided with

Is substituted into

Can obtain the product

Final expression and by

Can calculate L₂The final expression of (2).

Preferably, the third parameter L₃The expression of (a) is:

the gamma of the second hop link of the relay link can be obtained by the formula₂Cumulative distribution function of (2):

wherein E ═ γ₀，F＝γ₀。

Preferably, γ of the second hop link of the relay link₂The cumulative distribution function of (2), the cumulative distribution function of the SINR of the direct transmission link, and the probability density function of the SINR of the interference link are substituted into a third parameter L₃In the calculation, the following results can be obtained:

and (3) performing integral expansion on the formula to obtain a result:

will define the function sum A ═ gamma₀，B＝γ₀，E＝γ₀，F＝γ₀Substituting the above result, the calculation is simplified to obtain:

preferably, a fourth exact closed-form expression of the throughput of the relay link is obtained according to the definition of the throughput:

will be provided with

Unfolding was carried out to obtain:

throughput of available relay link:

preferably, after the throughput of the transmission link is obtained, the performance of the transmission link is evaluated, the throughput of the transmission link of the satellite-ground converged network system under different signal-to-interference-and-noise ratios is obtained, the throughput under different signal-to-interference-and-noise ratios is generated into a throughput signal-to-interference-and-noise ratio curve, and the performance of the transmission link under different throughputs is analyzed according to the throughput signal-to-interference-and-noise ratio curve. AS shown in fig. 7, FHS denotes frequency heavyshadooping, AS denotes AverageShadowing, DLTS denotes Directlinktransmissionscheme, and PRSS denotes pro-drelalysifiercecheme; for ease of analysis, assume N₁＝3，N₂＝3，M₁＝3，M₂3; while assuming R_s10bit/s/Hz and

the satellite-ground converged network system is in gamma₀Under different fading conditions of 3dB, the performance of the satellite-ground converged network system is enhanced with the increase of throughput, the performance of the transmission link is better as the throughput of the transmission link of the satellite-ground converged network is higher, and the performance of the transmission link is poorer as the throughput of the transmission link of the satellite-ground converged network is lower.

In addition, the invention also provides a medium, on which a performance evaluation program of the satellite-ground converged network transmission link is stored, and the performance evaluation program of the satellite-ground converged network transmission link is executed by a processor to realize the steps of the performance evaluation method of the satellite-ground converged network transmission link in each embodiment.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a satellite destination of a performance evaluation system of a satellite-ground converged network transmission link in a hardware operating environment according to an embodiment of the present invention, relating to hardware.

The performance evaluation system of the satellite-ground converged network transmission link in the embodiment of the invention comprises a satellite destination end, a handset source end and a plurality of ground relay ends; the satellite destination end can receive an uplink signal from the handset source end to form a direct transmission link between the handset source end and the satellite destination end in the performance evaluation system of the satellite-ground fusion network transmission link; or, the satellite destination receives the uplink signals transmitted from the handset source to the plurality of terrestrial relay terminals and assisted by the plurality of terrestrial relay terminals to form a plurality of relay links between the handset source and the satellite destination in the performance evaluation system of the satellite-terrestrial converged network transmission link, and selects a relay link with the largest signal-to-interference-plus-noise ratio from the plurality of relay links as a relay link between the handset source, the terrestrial relay terminal and the satellite destination.

As shown in fig. 8, the satellite destination of the performance evaluation system of the satellite-ground converged network transmission link may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wireless interface (e.g., a WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.

Those skilled in the art will appreciate that the hardware configuration of the satellite destination of the performance evaluation system of the satellite-ground converged network transmission link shown in fig. 8 does not constitute a limitation of the satellite destination of the performance evaluation system of the satellite-ground converged network transmission link, and may include more or less components than those shown, or combine certain components, or arrange different components. The satellite destination of the performance evaluation system of the satellite-ground converged network transmission link of the embodiment is described below with reference to fig. 8.

As shown in fig. 8, a memory 1005 as a medium may include an operating system, a network communication module, a user interface module, and a performance evaluation program of the star-earth converged network transmission link.

In fig. 8, the device processor 1001 is a control center of the terminal device, and connects various parts of the hardware structure of the satellite destination of the performance evaluation system of the whole satellite-ground converged network transmission link by using various interfaces and lines, by running or executing software programs and/or modules stored in the memory 1005, and calling the performance evaluation program of the satellite-ground converged network transmission link stored in the memory 1005, and performs the following operations:

the signal-to-interference-and-noise ratio of the direct transmission link in the satellite-ground fusion network is compared with a preset reference value gamma₀Comparing the sizes of the satellite-ground converged network, and determining a direct transmission link or a relay link in the satellite-ground converged network as a transmission link according to a comparison result; and calculating the throughput of the transmission link according to the signal-to-interference-and-noise ratio of the transmission link, and analyzing the performance of the selected transmission link based on the throughput.

if the transmission link is the direct transmission link, the signal to interference plus noise ratio of the direct transmission link is used as the signal to interference plus noise ratio of the transmission link, the interruption probability of the direct transmission link is calculated based on the signal to interference plus noise ratio, and a first parameter L is obtained₁(ii) a The first parameter L is measured₁Substituting the throughput expression of the direct transmission link for calculation to obtain the throughput of the direct transmission link as T ═ R_s×[1-L₁]Where T is the throughput of the direct link, R_sIs a preset transmission rate; if the transmission link is the relay link, calculating to obtain an accurate closed expression of the throughput of the relay link based on the signal-to-interference-and-noise ratio of the relay link, and obtaining the medium throughput of the relay link according to the accurate closed expressionThe throughput of the relay link is

calculating the signal-to-interference-and-noise ratio gamma of the first hop link between the source end of the handset and the ith ground relay end_1iAnd the signal-to-interference-and-noise ratio of the second hop link between the ith terrestrial relay terminal and the satellite destination terminalRatio gamma_2i(ii) a Wherein, i is more than or equal to 1 and less than or equal to N1, and N1 represents the number of ground relay terminals; comparing the signal-to-interference-and-noise ratio gamma of the first hop link corresponding to the ith ground relay terminal_1iAnd the signal-to-interference-and-noise ratio gamma of the second hop link_2iThe smaller value of the two is selected as the signal to interference plus noise ratio gamma of the relay link corresponding to the ith ground relay terminal_i＝min(γ_1i，γ_2i) (ii) a Similarly, calculating the signal-to-interference-and-noise ratios of relay links corresponding to the N1 ground relay terminals respectively: gamma ray₁，γ₂，......，γ_i，......，γ_N1Then, the maximum value is selected as the target signal-to-interference-and-noise ratio gamma_obj＝max(γ₁，γ₂，......，γ_i，.......，γ_N1) (ii) a The target signal-to-interference-and-noise ratio gamma is measured_objAnd the corresponding relay link is used as a target relay link, and the target relay link is determined as the transmission link.

determining a signal-to-interference-and-noise ratio (SINR) gamma of a first hop link in the target relay link_zj1(ii) a Determining a signal-to-interference-and-noise ratio of a second hop link of the target relay linksγ_zj2(ii) a The signal-to-interference-and-noise ratio gamma of a first hop link in the target relay link is determined_zj1Signal to interference plus noise ratio gamma with the second hop link in the target relay link_zj2And comparing, taking the minimum value as the signal to interference plus noise ratio of the target relay link, and expressing as: gamma ray_srd＝min(γ_zj1，γ_zj2) (ii) a Further obtaining the signal-to-interference-and-noise ratio of a transmission link of the satellite-ground converged network system as follows:

in the embodiment of the computer-readable storage medium of the present invention, all technical features of the embodiments of the performance evaluation method for the satellite-ground converged network transmission link are included, and the description and the explanation contents are substantially the same as those of the embodiments of the performance evaluation method for the satellite-ground converged network transmission link, and are not described herein in detail.

It should be understood that reference to "a plurality" herein means two or more. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.

Claims

1. A performance evaluation method of a satellite-ground converged network transmission link is characterized in that the satellite-ground converged network comprises a satellite destination terminal, a handset source terminal and a plurality of ground relay terminals, wherein the satellite destination terminal receives an uplink signal transmitted by the handset source terminal to form a direct transmission link between the handset source terminal and the satellite destination terminal; the satellite destination receives uplink signals transmitted from the handset source to the plurality of terrestrial relay terminals and assisted by the plurality of terrestrial relay terminals to form a plurality of relay links between the handset source and the satellite destination, wherein the method for evaluating the performance of the transmission links comprises the following steps:

the signal-to-interference-and-noise ratio of the direct transmission link in the satellite-ground fusion network is compared with a preset reference value gamma₀Comparing the sizes of the satellite-ground converged networks, and determining a direct transmission link or a relay link in the satellite-ground converged network as a transmission link according to a comparison result;

and calculating the throughput of the transmission link according to the signal-to-interference-and-noise ratio of the transmission link, and analyzing the performance of the selected transmission link based on the throughput.

2. The method for evaluating performance of transmission links of satellite-to-ground converged network of claim 1, wherein the step of calculating the throughput of the transmission links according to their signal-to-interference-and-noise ratios comprises:

if the transmission link is the direct transmission link, the signal to interference plus noise ratio of the direct transmission link is used as the signal to interference plus noise ratio of the transmission link, the interruption probability of the direct transmission link is calculated based on the signal to interference plus noise ratio, and a first parameter L is obtained₁；

The first parameter L is measured₁Substituting the throughput expression of the direct transmission link for calculation to obtain the throughput of the direct transmission link as T ═ R_s×[1-L₁]Where T is the throughput of the direct link, R_sIs a preset transmission rate；

If the transmission link is the relay link, calculating to obtain an accurate closed expression of the throughput of the relay link based on the signal-to-interference-and-noise ratio of the relay link, and obtaining the throughput of the relay link as

3. The method for performance evaluation of transport links of a satellite-to-ground converged network of claim 1, wherein the step of analyzing the performance of the selected transport links based on the throughput comprises:

acquiring the throughput of the transmission link under different signal to interference and noise ratios, and generating a throughput signal to interference and noise ratio curve according to the throughput under different signal to interference and noise ratios;

and analyzing the performance of the transmission link at different throughputs based on the throughput signal-to-interference-and-noise ratio curve.

4. The method for evaluating performance of transmission link of satellite-ground converged network according to claim 1, wherein the signal-to-interference-and-noise ratio of the direct transmission link is compared with the preset reference value γ₀The step of comparing the magnitudes of (a) and (b) comprises:

5. The method for evaluating performance of transmission link in satellite-ground converged network according to claim 1, wherein the step of determining the direct transmission link or the relay link in the satellite-ground converged network as the transmission link according to the comparison result comprises:

if the comparison result is that the signal to interference plus noise ratio of the direct transmission link is smaller than the preset reference value, determining a target relay link from the plurality of relay links as the transmission link;

and if the comparison result is that the signal to interference plus noise ratio of the direct transmission link is greater than or equal to the preset reference value, determining the direct transmission link as the transmission link.

6. The method for evaluating performance of a satellite-to-ground converged network transmission link of claim 5, wherein the step of determining a target relay link from the plurality of relay links as the transmission link comprises:

calculating the signal-to-interference-and-noise ratio gamma of the first hop link between the source end of the handset and the ith ground relay end_1iAnd the signal-to-interference-and-noise ratio gamma of a second hop link between the ith terrestrial relay terminal and the satellite destination terminal_2i(ii) a Wherein, i is more than or equal to 1 and less than or equal to N1, and N1 represents the number of ground relay terminals;

comparing the signal-to-interference-and-noise ratio gamma of the first hop link corresponding to the ith ground relay terminal_1iAnd the signal-to-interference-and-noise ratio gamma of the second hop link_2iThe smaller value of the two is selected as the signal to interference plus noise ratio gamma of the relay link corresponding to the ith ground relay terminal_i＝min(γ_1i,γ_2i)；

Similarly, calculating the signal-to-interference-and-noise ratios of relay links corresponding to the N1 ground relay terminals respectively:

γ₁,γ₂,……,γ_i,……,γ_N1，

then, the maximum value is selected as the target signal-to-interference-and-noise ratio gamma_obj＝max(γ₁,γ₂,……,γ_i,……,γ_N1)；

The target signal-to-interference-and-noise ratio gamma is measured_objAnd the corresponding relay link is used as a target relay link, and the target relay link is determined as the transmission link.

7. The method for evaluating performance of a satellite-to-ground converged network transmission link of claim 5, wherein the step of determining a target relay link from the plurality of relay links as the transmission link comprises:

calculating the signal-to-interference-and-noise ratio gamma of the first hop link between the source end of the handset and the ith ground relay end_1iWherein, i is more than or equal to 1 and less than or equal to N1, and N1 represents the number of ground relay terminals;

similarly, calculating the signal-to-interference-and-noise ratio γ of the first hop link in the relay links respectively corresponding to the N1 terrestrial relay terminals₁₁,γ₁₂,……,γ_1i,……,γ_1N1Then, the maximum value is selected as the reference signal-to-interference-and-noise ratio gamma_ref＝max(γ₁₁,γ₁₂,……,γ_1i,……,γ_1N1)；

The reference signal-to-interference-and-noise ratio gamma is measured_refAnd the corresponding relay link is used as a target relay link, and the target relay link is determined as the transmission link.

8. The method for evaluating performance of a satellite-to-ground converged network transport link of claim 7, wherein the step of setting the target relay link as the transport link is followed by:

determining a signal-to-interference-and-noise ratio (SINR) gamma of a first hop link in the target relay link_zj1；

Determining a signal-to-interference-and-noise ratio gamma of a second hop link in the target relay link_zj2；

The signal-to-interference-and-noise ratio gamma of a first hop link in the target relay link is determined_zj1Signal to interference plus noise ratio gamma with the second hop link in the target relay link_zj2And comparing, taking the minimum value as the signal to interference plus noise ratio of the target relay link, and expressing as:

γ_srd＝min(γ_zj1,γ_zj2)；

further obtaining the signal-to-interference-and-noise ratio of a transmission link of the satellite-ground converged network system as follows:

9. a performance evaluation system of a satellite-ground converged network transmission link is characterized by comprising a satellite destination end, a handset source end and a plurality of ground relay ends; the satellite destination end can receive an uplink signal from the handset source end to form a direct transmission link between the handset source end and the satellite destination end in the performance evaluation system of the satellite-ground fusion network transmission link;

the satellite destination comprises a memory, a processor and a performance evaluation program of the transmission link of the satellite-ground converged network, which is stored on the memory and can run on the processor, and when being executed by the processor, the performance evaluation program of the transmission link of the satellite-ground converged network realizes the steps of the performance evaluation method of the transmission link of the satellite-ground converged network according to any one of claims 1 to 8.

10. A medium, characterized in that the medium stores thereon a performance evaluation program of a star-earth converged network transmission link, which when executed by a processor implements the steps of the performance evaluation method of the star-earth converged network transmission link according to any one of claims 1 to 8.