CN114844584B - Simulation method of beam channel based on random twin cluster - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a simulation method of a beam channel based on a random twin cluster. Determining the number of scattering point clusters at a transmitting and receiving end according to the width of a beam at the transmitting and receiving end, and initializing the positions of the scattering point clusters to obtain a beam parameter at the transmitting and receiving end; calculating beam response according to the beam parameters of the transceiving end, and calculating the channel transmission function of each link at the current moment; updating time, the positions of a transceiving end, a beam direction and a scattering cluster position, calculating a channel transmission function of each link at the updating time, calculating the survival probability of the scattering cluster in a beam range, determining the occurrence and the extinction of the scattering cluster after the updating time, counting the number of the surviving scattering clusters, determining the number of the scattering clusters based on a Poisson process, and generating a new scattering cluster if the survival number is lower than the threshold. The method of the invention considers the random mobility of the scattering cluster and the influence of the wave beam on the scattering cluster generation and extinction, and makes up for the fact that the random mobility of the scattering cluster and the influence of the wave beam on the scattering cluster generation and extinction characteristics are not considered in the conventional random channel modeling theory.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a beam channel simulation method based on a random twin cluster.
Background
As a key technology in 5G, MIMO (Multiple Input Multiple Output) technology and beamforming technology, not only can the frequency band utilization rate be greatly improved, but also the serious path loss caused by a high frequency band, especially a millimeter wave frequency band, can be overcome, thereby attracting wide attention in academic and industrial fields. In recent years, with the continuous development of car networking, unmanned aerial vehicles, high-speed railways, urban rail transit and the like, the beamforming technology shows huge application advantages and potentials in wireless communication of high-mobility scenes, and therefore, the accurate and efficient beam channel model can provide important physical layer technical support for research and analysis of radio wave propagation characteristics, communication system optimization and the like in the high-mobility scenes.
The wireless channel model methods are mainly classified into deterministic channel modeling and stochastic channel modeling. The typical method of the deterministic channel model is a ray tracing method, which calculates parameters of multipath, such as power, angle, time delay and the like, by constructing an accurate propagation environment. Representative models in the stochastic channel modeling method are a geometric-based stochastic channel model and a non-geometric stochastic modeling method, typical non-geometric stochastic channel models include a tapped delay line model and a clustered delay line model, and the geometric-stochastic-based model assumes that scattering points are distributed on a regular geometric shape. Although some work is carried out on random channel models based on geometry to carry out research on beam channel modeling, the models do not take the mobility of scattering points into consideration, and do not take the influence of beams on scattering cluster extinction into consideration, so that the non-stationary characteristics of channels under beam channels are difficult to characterize.
Disclosure of Invention
The invention provides a beam channel simulation method based on a random twin cluster, which is used for solving the problem that the movement characteristic of a scattering cluster is not considered in the conventional random channel modeling theory.
In order to achieve the purpose, the invention adopts the following technical scheme.
A simulation method of beam channels based on random twin clusters comprises the following steps:
initializing a receiving and transmitting end beam parameter, wherein the receiving and transmitting end beam parameter comprises a beam direction and a beam width, the beam direction is determined according to the position of a receiving and transmitting end, the number of scattering point clusters of the receiving and transmitting end is determined according to the width of the receiving and transmitting end beam, the position of each scattering point cluster is initialized by adopting a Matern hard kernel Poisson cluster process, and a random speed is given to each scattering point cluster;
determining the current time when simulation starts, calculating beam response according to initialization parameters of receiving and transmitting end beams, constructing a line-of-sight link, a single-hop link and a double-hop link, calculating a transmission function corresponding to each link by adopting a propagation diagram theory, and calculating to obtain a channel transmission function of each link at the current time;
updating time, the positions of a transceiving end, a beam direction and a scattering cluster position, calculating to obtain a channel transmission function of each link at an updating moment, and calculating the survival probability of each scattering cluster according to the position and the speed of the scattering cluster at each moment;
determining the occurrence and the extinction of the scattering clusters after the updating time according to the scattering cluster survival probability, counting the number of the survival scattering clusters, determining the number of the scattering clusters at the moment based on the poisson process, and if the survival number is lower than the threshold value, generating a new scattering cluster based on the Matern hard-core poisson cluster process; the above process is repeated until the simulation deadline.
Preferably, the initializing a transceiving end beam parameter includes a beam direction and a beam width, where the beam direction is determined according to a transceiving end position, the number of scattering point clusters at the transceiving end is determined according to the width of a transceiving end beam, the position of each scattering point cluster is initialized by using a matern hard kernel poisson cluster process, and a random speed is given to each scattering point cluster, including:
the beam pointing direction of the transmitting and receiving ends is determined by the angle of the line-of-sight link, the horizontal angle of departure of the line-of-sight linkAnd away from pitchThe calculation formula is as follows:
whereinRespectively representing the array center coordinates of the originating and terminating ends,respectively representx、 y、zAxial unit vector, signIt is shown that the operation of the inner product of the vectors,representing an inverse cosine function; similar horizontal angle of arrival for line-of-sight linksAnd angle of pitch of arrival;
The beam pointing direction of the transceiving end is calculated as follows:
whereinIndicating the transmit/receive beam horizontal pointing angle,representing the transmit/receive beam elevation pointing angle;indicating the horizontal angle of departure/arrival of the transceiving end line-of-sight link,a pitch angle representing departure/arrival of the transceiving end line-of-sight link;indicating the horizontal width of the originating/receiving beam,representing the pitch width of the originating/receiving beam;represents a rounding function;
determining the number of scattering point clusters at the transmitting and receiving ends according to the width of the wave beams at the transmitting and receiving ends, wherein the calculation formula is as follows:
whereinWhich represents the initial moment of time of day,indicating the number of originating/terminating scattering clusters,in order to be the density factor, the density of the sample,representing the effective radius centered at the base station/terminal,represents the minimum and maximum values of the transmit/receive beam in elevation, and has;
Generating scattering clusters based on a Matern hard kernel Poisson cluster process, firstly generating the positions of scattering point cluster centers by adopting the Matern hard kernel point process, wherein the positions of any two scattering cluster centers need to meet the following requirements:
whereinRespectively representing the coordinates of the centers of two different scattering clusters,expressing the minimum interval between clusters, and generating cluster scattering points based on the Poisson point process for the generated scattering cluster center, wherein the cluster scattering points need to satisfy the following conditions:
whereinRepresenting scattering clustersmInner to the firstiScattering pointThe coordinates of (a) are calculated,representing effective radius of scattering cluster, for scattering clustermAll scattering points within the image are assigned a random velocity, denoted。
Preferably, the determining the current time when the simulation starts, calculating a beam response according to an initialization parameter of a beam at a transceiving end, constructing a line-of-sight link, a single-hop link, and a double-hop link, calculating a transmission function corresponding to each link by using a propagation map theory, and calculating a channel transmission function of each link at the current time includes:
determining the current time when the simulation starts, wherein the beam parameters at the transceiving end comprise beam pointing direction and beam width, and the beam response calculation formula is as follows:
whereinAny horizontal angle and pitch angle of the originating/terminating end are shown,maximum beam gain representing the transmit/receive beam;
the line-of-sight link refers toIn a direct link ofRefer to the originating endpAn antenna is arranged on the base plate, and the antenna is arranged on the base plate,refer to the receiving endqAn antenna; the single-hop link is represented asIndicating the proximity of the originating endmA plurality of scattering clusters, each scattering cluster having a plurality of scattering lines,indicating the vicinity of the terminating endnA scattering cluster, and have(ii) a The double-hop link is represented as;
The transmission function corresponding to each link is calculated by adopting a propagation diagram theory, wherein the transmission function expression of the direct link is as follows:
whereinRepresenting line-of-sight linksThe distance between the first and second electrodes,which is indicative of the wavelength of the light,in order to be a time-delay variable,is a variable of the time, and is,in order to be the speed of light,is a dirac function; the transmission function of the single-hop link is expressed as:
whereinIndicating a linkThe distance of (a) to (b),representing scattering clustersnInner firstjScattering point,Representing scattering clustersThe number of internal scattering points is greater than the total number of internal scattering points,indicating a linkGain, the expression is as follows:
whereinRepresenting scattering pointsRelative to the horizontal and pitch angles of departure from the origin,representing scattering pointsRelative to the horizontal and pitch angles of approach at the closeout,respectively represent The calculation formula of the average transmission delay is as follows:
the transfer function of the dual-hop link is expressed as:
whereinIs a scattering attenuation factor, the value of which depends on the material of the scattering cluster;
the channel transfer function is the sum of the transfer functions of the links, and is expressed as:
preferably, the updating time, the positions of the transceiving end, the beam direction, and the positions of the scattering clusters are calculated to obtain a channel transfer function of each link at the updating time, and the survival probability of the scattering clusters in the beam range is calculated according to the channel transfer function of each link at each time, including:
the receiving and transmitting end position is updated as follows:
whereinRefer toAt the moment of timetIn the position of (a) in the first,refer toAt the moment of timeIn the position of (a) in the first,representing the velocity vectors of the originating and the terminating ends; the scattering clusterThe location update is as follows:
whereinRefers to originating/terminating scattering clustersCentered at the momenttIn the position of (a) in the first,the scattering cluster center of the transmitting end/receiving end is in the timeIn the position of (a) in the first,representing originating/receiving scattering clustersAt the moment of timetThe scattering cluster is in a random walk state, the scattering clusterThe speed of (2) is updated as follows:
whereinTransmitting/receiving end scattering clusterAt the moment of timeThe instantaneous speed of the vehicle (c) is,is a factor of the inertia, and is,representing originating/receiving scattering clustersAt the moment of timeIs expressed as follows:
whereinRepresenting originating/receiving scattering clustersAt the moment of timetIn order to maintain track continuity, the phase is updated as follows:
whereinWhich represents the maximum allowed phase shift and,to be uniformly distributed inRandom variable in between;
the updated beam pointing angle is specifically as follows: according to the updated coordinates of the transmitting and receiving ends, the departure angle and the arrival angle of the line-of-sight link are calculated, and the beam direction is updated based on a formula (1-4);
the filtering of the scattering clusters outside the beam range according to the beam direction specifically includes: for single hop linksAnddetermining the center of the scattering clusterWhether the scattering cluster is positioned in the wave beam range of the transmitting and receiving ends at the same time or not, if not, removing the scattering cluster;
the scattering cluster survival probability calculation formula is as follows:
whereinScattering cluster for representing originating/receiving endThe parameters of the birth or death over time,scattering cluster for representing originating/receiving endA birth-to-death parameter on the beam;which represents the reference distance, is a fixed constant,the reference angle is represented as a fixed constant;indicating a linkThe angle between the beam direction and the transmitting end/receiving end.
Preferably, the occurrence and the extinction of the scattering clusters after the updating time are determined according to the scattering cluster survival probability, the number of the survival scattering clusters is counted, the number of the scattering clusters at the moment is determined based on the poisson process, and if the survival number is lower than the threshold value, a new scattering cluster is generated based on the Matern hard-core poisson cluster process; repeating the above process until the simulation deadline time, comprising:
randomly generating a random number uniformly distributed among (0,1)If at allThen the scattering cluster of the transmitting/receiving endAt the moment of timeSurvival; if it isThen the scattering cluster of the transmitting/receiving endAt the moment of timeEliminating;
to be provided withGenerating a random variable of a slave Poisson process for a mean valueAnd for random variablesRounding is carried out if the number of the scattering clusters surviving at the transmitting end/the receiving end is less thanGenerating a new scattering cluster based on a Matern hard-core Poisson cluster process; all steps corresponding to equations (1-25) are repeated until the simulation deadline.
According to the technical scheme provided by the embodiment of the invention, the method considers the random mobility of the scattering cluster and the influence of the wave beam on the scattering cluster generation and extinction, makes up the problem that the random mobility of the scattering cluster and the influence of the wave beam on the scattering cluster generation and extinction characteristics are not considered in the conventional random channel modeling theory, and provides a new method for random channel simulation in a wave beam mode.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a process flow diagram of a simulation method of a beam channel based on a random twin cluster according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
The processing flow of the simulation method based on the random twin cluster beam channel provided by the invention is shown in fig. 1, and comprises the following processing steps:
step S1, beam pointing is determined according to the position of a transmitting and receiving end of wireless communication, the number of scattering point clusters of the transmitting and receiving end is determined according to the width of the beam of the transmitting and receiving end, the position of the scattering point clusters is initialized by adopting a Matern hard kernel Poisson cluster process, and random speed is given to each scattering point cluster.
The beam pointing direction of the transmitting and receiving end is determined by the angle of a line-of-sight link, and the horizontal angle of the line-of-sight linkAnd angle of departure pitchThe calculation formula of (a) is as follows:
whereinRespectively representing the array center coordinates of the originating terminal and the terminating terminal,respectively representx、y、zAxial unit vector, signIt is shown that the operation of the inner product of the vectors,representing an inverse cosine function; similar horizontal angle of arrival for line-of-sight linksAnd angle of pitch of arrival;
The beam pointing is calculated as follows:
whereinIndicating the originating/terminating beam horizontal pointing angle,representing the transmit/receive beam elevation pointing angle;indicating the horizontal angle of departure/arrival of the transceiving end line-of-sight link,a pitch angle representing departure/arrival of the transceiving end line-of-sight link;indicating the horizontal width of the originating/terminating beam,represents the pitch width of the transmit/receive beam;represents a rounding function;
determining the number of scattering point clusters at the transmitting and receiving ends according to the width of the wave beams at the transmitting and receiving ends, wherein the calculation formula is as follows:
whereinWhich represents the initial moment of time of day,indicating the number of originating/terminating scattering clusters,in order to be the density factor, the density of the sample,representing an effective radius centered at the base station/terminal,represents the minimum and maximum values of the transmit/receive beam in elevation, and has。
Generating scattering clusters based on a Matern hard kernel Poisson cluster process, firstly generating the positions of scattering point cluster centers by adopting the Matern hard kernel point process, wherein the positions of any two scattering cluster centers need to meet the following requirements:
whereinAndrespectively representing the coordinates of the centers of two different scattering clusters,indicating the minimum spacing between clusters. For the generated scattering cluster center, generating an in-cluster scattering point based on a poisson point process, wherein the in-cluster scattering point needs to satisfy the following conditions:
whereinRepresenting scattering clustersmInner to the firstiScattering pointIs determined by the coordinate of (a) in the space,representing the effective radius of the scattering cluster. For scattering clustermAll scattering points within the image are assigned a random velocity, denoted。
And S2, calculating beam response according to the beam parameters of the transmitting and receiving ends, constructing a line-of-sight link, a single-hop link and a double-hop link, and calculating a transmission function corresponding to each link by adopting a propagation diagram theory so as to obtain a channel transmission function at the moment.
The receiving and transmitting end beam parameters refer to beam pointing direction and beam width, and the beam response calculation formula is as follows:
whereinAndrepresents any horizontal angle and pitch angle of the transmitting end/receiving end,representing the maximum beam gain of the originating/receiving beam.
The line-of-sight link refers toIn a direct link ofRefer to the originating endpAn antenna is arranged on the base plate, and the antenna is arranged on the base plate,refer to the receiving endqAn antenna; the single-hop link is represented as,Indicating the proximity of the originating endmA plurality of scattering clusters, each scattering cluster having a plurality of scattering lines,indicating the vicinity of the receiving endnA scattering cluster, and has(ii) a The double-hop link is represented as。
The transmission function corresponding to each link is calculated by adopting a propagation diagram theory, wherein the transmission function expression of the direct link is as follows:
whereinRepresenting line-of-sight linksThe distance between the first and second electrodes is less than the predetermined distance,which represents the wavelength of the light emitted by the light source,in order to be a time-delay variable,is a variable of the time, and is,in order to be the speed of light,is a dirac function; the single-hop link transfer function can be expressed as:
whereinIndicating a linkThe distance of (a) to (b),representing scattering clustersnInner firstjScattering point,Representing scattering clustersThe number of internal scattering points is greater than the total number of internal scattering points,andindicating a linkGain, the expression is as follows:
whereinRepresenting scattering pointsRelative to the horizontal and pitch angles of departure from the origin,representing scattering pointsRelative to arrival at the receiving endThe horizontal angle and the pitch angle of arrival,respectively represent The calculation formula of the average transmission delay is as follows:
the transmission function of the double-hop link can be expressed as:
whereinThe value of the scattering attenuation factor depends on the material of the scattering cluster.
The channel transfer function at the time is calculated as:
s3, updating time, updating the position of the transceiver end, the beam direction and the position of a scattering cluster, filtering the scattering cluster outside the beam range according to the beam direction, and calculating the survival probability of the scattering cluster in the beam range;
the receiving and transmitting end position is updated as follows:
whereinRefer toAt the moment of timetIn the position of (a) in the first,refer toAt the moment of timeIn the position of (a) in the first,representing the velocity vectors of the originating terminal and the terminating terminal; the scattering clusterThe location update is as follows:
whereinRefers to originating/terminating scattering clustersCentered at the momenttIn the position of (a) in the first,the scattering cluster center of the transmitting end/receiving end is in the timeIn the position of (a) in the first,representing originating/receiving scattering clustersAt the time of daytThe scattering cluster is in a random walk state, the scattering clusterThe speed of (2) is updated as follows:
whereinTransmitting/receiving end scattering clusterAt the time of dayThe instantaneous speed of the vehicle (c) is,is a factor of the inertia, and is,representing originating/receiving scattering clustersAt the moment of timeIs expressed as follows:
whereinRepresenting originating/receiving scattering clustersAt the moment of timetIn order to maintain track continuity, the phase is updated as follows:
whereinWhich represents the maximum allowed phase shift and,is uniformly distributed inRandom variable in between.
The updating of the beam pointing angle is specifically as follows: according to the updated coordinates of the transmitting and receiving ends, the departure angle and the arrival angle of the line-of-sight link are calculated, and the beam direction is updated based on a formula (1-4);
the method for filtering the scattering clusters outside the beam range according to the beam direction specifically comprises the following steps: for single hop linksAnddetermining the center of the scattering clusterWhether the scattering cluster is positioned in the wave beam range of the transmitting and receiving ends at the same time or not, if not, removing the scattering cluster;
the scattering cluster survival probability calculation formula is as follows:
whereinScattering cluster for representing originating/receiving endThe parameters of the occurrence and extinction over time,scattering cluster for representing originating/receiving endA birth-to-death parameter on the beam;which represents the reference distance, is a fixed constant,the reference angle is represented as a fixed constant;indicating a linkThe angle between the beam direction and the transmitting end/receiving end.
S4, determining the occurrence and extinction of the scattering clusters after the updating time according to the survival probability, counting the number of the survival scattering clusters, determining the number of the scattering clusters at the moment based on the poisson process, and generating new scattering clusters based on the Matern hard-core poisson cluster process if the survival number is lower than the threshold; the above process is repeated until the simulation cutoff time.
The method for determining the occurrence and the extinction of the scattering clusters after the updating time according to the survival probability comprises the following steps: randomly generating a random number uniformly distributed among (0,1)If, ifThen the scattering cluster of the transmitting/receiving endAt the moment of timeSurvival, otherwise, death; to be provided withGenerating a random variable from the poisson process for the meanAnd rounding the scattering clusters if the number of the scattering clusters surviving at the transmitting end/receiving end is less thanGenerating a new scattering cluster based on a Matern hard-core Poisson cluster process; and (4) repeating all the steps corresponding to the formulas (1-25) until the simulation deadline time, and obtaining the channel transmission function of the link after the update time.
In summary, the method of the embodiment of the invention makes up for the fact that the influence of random mobility of the scattering cluster and the generation and extinction characteristics of the beam on the scattering cluster is not considered in the existing random channel modeling theory, and provides a new method for random channel modeling in a beam mode.
Compared with the traditional random geometric channel modeling method, the random mobility of the scattering cluster is considered on one hand, and the influence of the beam on channel simulation is considered on the other hand, so that the method is more suitable for simulating the random channel in a multi-antenna beam forming mode moving scene.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A simulation method of beam channels based on random twin clusters is characterized by comprising the following steps:
initializing a transmitting end wave beam parameter and a receiving end wave beam parameter, wherein the transmitting end wave beam parameter and the receiving end wave beam parameter comprise wave beam direction and wave beam width, the wave beam direction is determined according to the transmitting end position and the receiving end position, the number of transmitting end scattering clusters and the receiving end scattering clusters is determined according to the transmitting end wave beam width and the receiving end wave beam width, the position of the scattering clusters is initialized by adopting a Matern hard core point and Poisson point process, and random speed is given to each scattering cluster;
step 2, determining the initial moment of the simulation startAccording to the beginning of the originating end and the receiving endThe method comprises the steps of calculating beam response by using an initialized beam parameter, constructing a line-of-sight link, a single-hop link and a double-hop link, calculating transmission functions corresponding to all links by adopting a propagation diagram theory, and calculating the sum of the transmission functions corresponding to all links as an initialized channel transmission function;
updating time, updating positions of the transmitting end and the receiving end, beam direction and speed and positions of scattering clusters, filtering the scattering clusters outside intersection of the transmitting end beam range and the receiving end beam range according to the transmitting end and the receiving end beam direction, calculating to obtain a channel transmission function of the current updating time, and calculating survival probability of each scattering cluster according to the position and speed of the scattering cluster of the current updating time;
determining the occurrence and the extinction of the scattering clusters at the current updating time according to the scattering cluster occurrence probability, counting the number of the survival scattering clusters, calculating the number of the scattering clusters at the current updating time based on the Poisson process and setting the number as a threshold, and if the number of the survival scattering clusters is lower than the threshold, generating new scattering clusters based on the Matern hard nuclear point and the Poisson point process; repeating the processing processes corresponding to the steps 3-4 until the simulation deadline;
the step 2 comprises the following steps:
determining an initial time at which simulation beginsThe beam parameters of the transmitting end and the receiving end comprise beam pointing direction and beam width, and the beam response calculation formula is as follows:
whereinIndicating any horizontal angle of the originating/terminating end,indicating any pitch angle of the originating/terminating end,represents the maximum beam gain of the originating/receiving beam,representing the horizontal pointing angle of the originating/terminating beam,indicating the elevation pointing angle of the originating/receiving beam,indicating the horizontal width of the originating/receiving beam,represents the pitch width of the transmit/receive beam;
the line-of-sight link refers toIn a direct link ofRefer to the originating endpAn antenna is arranged on the base plate, and the antenna is arranged on the base plate,refer to the receiving endqAn antenna; the single-hop link is represented as,Indicating the proximity of the originating endmA plurality of scattering clusters, each scattering cluster having a plurality of scattering lines,indicating the vicinity of the receiving endnA scattering cluster, and have,Indicating the number of scattering clusters near the originating end,the number of scattering clusters near the receiving end is shown, and the double-hop link is shown as;
The transmission function corresponding to each link is calculated by adopting a propagation diagram theory, wherein the transmission function expression of the direct link is as follows:
whereinIs the number of the imaginary numbers,representing line-of-sight linksThe distance of (a) to (b),which represents the wavelength of the light emitted by the light source,in order to be a time-delay variable,is a variable of the time, and is,in order to be the speed of light,is a dirac function; the transmission function of the single-hop link is expressed as:
whereinIndicating a linkThe distance of (a) to (b),representing scattering clustersInner firstiThe number of scattering points is such that,indicating a linkThe distance of (a) to (b),indicating a linkThe distance of (a) to (b),indicating a linkThe distance of (a) to (b),representing scattering clustersInner firstjThe number of the scattering points is,representing scattering clustersThe number of internal scattering points is greater than the total number of internal scattering points,indicating a linkThe gain of (a) is obtained by the gain of (b),indicating a linkThe gain of (a) is obtained,the expression is as follows:
whereinRepresenting scattering pointsRelative to the horizontal and pitch angles of departure from the origin,representing scattering pointsRelative to the horizontal and pitch angles of approach at the closeout,respectively representing links The calculation formula of the average transmission delay is as follows:
the transfer function of the dual-hop link is expressed as:
whereinIs a scattering attenuation factor, the value of which depends on the material of the scattering cluster;
the channel transfer function is the sum of the transfer functions of the links, and is expressed as:
the step 4 comprises the following steps:
randomly generating a random number uniformly distributed among (0,1)If, ifIn whichRepresenting originating scattering clustersEnd scattering clusterAt the time of dayProbability of survival, the originating scattering clusterEnd scattering clusterAt the moment of timeSurvival; if it isThen the originating scattering clusterEnd scattering clusterAt the moment of timeEliminating;
the number of scattering clusters at the current update time is calculated based on the poisson process and is set as a threshold, specifically: to be provided withGenerating a random variable from the originating/receiving end of the poisson process for the meanWhereinRepresenting the initial time and for random variablesRounding, using the rounded value as the set threshold value,
if the number of the scattering clusters which survive at the transmitting end/the receiving end is smaller than a threshold value, generating a new scattering cluster based on Matern hard core point and Poisson point processes; and repeating the processing procedures of the steps 3 to 4 until the simulation deadline.
2. The method of claim 1, wherein step 1 comprises:
the beam pointing direction of the originating and receiving end is determined by the angle of the line-of-sight link, which is away from the horizontalAnd an angle of departure pitchThe calculation formula of (a) is as follows:
whereinRespectively representing the center coordinates of the antenna array at the transmitting end and the receiving end,respectively representxAndzaxial unit vector, signIt is shown that the operation of the inner product of the vectors,representing an inverse cosine function; solving for the horizontal angle of arrival of the line-of-sight linkAnd angle of pitch of arrival;
The beam pointing direction of the originating/receiving end is calculated as follows:
whereinIndicating the originating/terminating beam horizontal pointing angle,indicating the transmit/receive beam elevation pointing angle,representing the horizontal angle of arrival at the originating/terminating end of the line-of-sight link,representing the elevation angle of arrival of elevation departure/convergence of the line-of-sight link origination;indicating the horizontal width of the originating/receiving beam,represents the pitch width of the transmit/receive beam;represents a rounding function;
determining the number of the transmitting end/receiving end scattering point clusters according to the transmitting end/receiving end beam width, wherein the calculation formula is as follows:
whereinWhich represents the initial moment of time of day,representThe number of time-to-make/receive scattering clusters,in order to be the density factor, the density of the sample,indicating an effective radius centered on the originating/terminating end,represents the minimum and maximum values of the transmit/receive beam in elevation, and has;
Generating a scattering cluster based on a Matern hard core point process and a Poisson cluster process, firstly generating the center position of the scattering cluster by adopting the Matern hard core point process, wherein the center positions of any two scattering clusters need to meet the following requirements:
whereinRespectively representing the coordinates of the centers of two different scattering clusters,representing the minimum interval between the scattering clusters, and generating scattering points in the scattering clusters based on the Poisson point process for the generated scattering cluster center, wherein the scattering points in the scattering clusters need to meet the requirement:
3. The method of claim 2, wherein step 3 comprises:
the transmitting end/receiving end position is updated as follows:
whereinIs referred to as the first of originpAn antennaAt the end ofqAn antennaAt the time of daytIn the position of (a) in the first,is referred to as the first of originpAn antennaAt the end ofqAn antennaAt the moment of timeIn the position of (a) in the first,a velocity vector representing the originating/receiving end; the originating scattering clusterEnd scattering clusterThe location update is as follows:
whereinRefers to originating scattering clustersCenter/terminus scattering clusterCentered at the momenttIn the position of (a) or (b),is an originating scattering clusterEnd scattering clusterCentered at the momentIn the position of (a) in the first,representing originating scattering clustersEnd scattering clusterAt the moment of timetThe scattering cluster is in a random walk state, and the scattering cluster is initiatedEnd scattering clusterThe speed of (2) is updated as follows:
whereinOriginating scattering clusterEnd scattering clusterAt the moment of timeThe speed of the vehicle is measured by the speed sensor,is a factor of the inertia of the object,representing originating scattering clustersEnd scattering clusterAt the time of dayIs expressed as follows:
whereinRepresenting originating scattering clustersEnd scattering clusterAt the moment of timetIn order to maintain track continuity, the phase is updated as follows:
whereinRepresenting originating scattering clustersEnd scattering clusterAt the moment of timeThe horizontal phase of the instantaneous speed of the rotor,which represents the maximum allowed phase shift and,to be uniformly distributed inRandom variable in between;
the update beam pointing is specifically as follows: according to the updated positions of the transmitting end and the receiving end, calculating a departure angle and an arrival angle of the line-of-sight link, and updating the beam direction based on formulas (15) - (16);
according to the beam direction, scattering clusters outside the beam range are filtered, specifically as follows: for single hop linksAnd determining originating scattering clustersCentered at the momentPosition ofWhether the scattering cluster is positioned in the range of the transmitting end wave beam and the receiving end wave beam simultaneously, if not, removing the transmitting end scattering cluster(ii) a Judging receiving end scattering clusterCentered at the momentIn the position ofWhether the scattering cluster is located in the transmitting end wave beam range and the receiving end wave beam range at the same time, if not, removing the receiving end scattering cluster;
Calculating the survival probability of the scattering clusters in the intersection of the originating beam range and the terminating beam range according to the position and the speed of the scattering clusters at the current updating time, wherein the calculation formula is as follows:
whereinRepresenting originating scattering clustersEnd scattering clusterThe parameters of the birth or death over time,representing originating scattering clustersEnd scattering clusterA birth-to-death parameter on the beam;representing a reference distance, as a fixed constant,The reference angle is represented as a fixed constant;indicating a linkPointing with the originating beam/linkAnd the beam direction of the receiving end.
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