Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of realization wireless network communication field intensity emulation of coverage capability systemsSystem and method.
The invention is realized in this way a kind of realization wireless network communication field intensity emulation of coverage capability method, described to realize wirelesslyNetwork communication Field strength coverage emulation mode includes:
The first step detects wireless network using based on Optimum combining and the signal detector of the signal detection algorithm of characteristic valueSignal of communication；
Second step measures wireless network communication field intensity intensity data using field strength measurement device；
Third step utilizes the model of place of modeling software building wireless network communication field intensity distribution；
4th step calculates the wireless network communication field intensity area of coverage according to the field strength data of detection using calculation procedureDomain；
5th step optimizes processing to field strength data using the optimization program based on second order approximatioss；Second order Approximation NumberIt include: the Taylor expansion of the function of many variables according to optimization algorithm are as follows:
Second order expension is carried out to loss function:
The necessary condition that loss function obtains minimum value is:
Finally obtain the iterative formula of β:
6th step shows signal of communication, field strength, model of place, overlay area data using display.
Further, the signal detection algorithm based on Optimum combining and characteristic value specifically includes in the first step:
(1) collected wireless communication signal is done into discrete Fourier transform, and in frequency domain using maximization outputThe criterion of signal power determines a best initial weights, then merges multiple signals with best initial weights；
(2) real part of data after merging is taken, autocorrelation matrix R is constructedy(Ns)；
(3) all characteristic values for seeking matrix Ry (Ns), then acquire detection statistic T according to corporal；
Tr (R in formulay(Ns)) be composite signal autocorrelation matrix mark, i.e. the sum of all characteristic values of matrix, by matrixThe ratio between mark and minimal eigenvalue are used as detection statistic；
(4) following formula is combined, the theoretical detection threshold γ under specific false-alarm probability is calculated；
F in formula1For the cumulative distribution function that Tracy-Widom the 1st is distributed, there is no expression formula form, the function is correspondingValue is acquired by tabling look-up；
(5) adjudicate: if T > γ, there are signal, affirmative judgements in channel；Otherwise signal, negative decision is not present.
The realization wireless network communication field intensity emulation of coverage capability method is realized another object of the present invention is to provide a kind ofRealization wireless network communication field intensity emulation of coverage capability system, the realization wireless network communication field intensity emulation of coverage capability system includes:
Signal detection module is connect with main control module, for detecting wireless communication signal by signal detector；
Communication field intensity measurement module, connect with main control module, for measuring wireless communication field by field strength measurement deviceStrong intensity data；
Main control module constructs module, Field strength coverage meter with signal detection module, communication field intensity measurement module, model of placeModule, data-optimized module, display module connection are calculated, is worked normally for controlling modules by single-chip microcontroller；
Model of place constructs module, connect with main control module, for constructing wireless network communication field intensity by modeling softwareThe model of place of distribution；
Field strength coverage computing module, connect with main control module, for the field strength number by calculation procedure according to detectionAccording to calculating wireless network communication field intensity overlay area；
Data-optimized module, connect with main control module, for optimizing processing to field strength data by optimizing program；
Display module is connect with main control module, for by display display signal of communication, field strength, model of place,Overlay area data.
Another object of the present invention is to provide a kind of application realization wireless network communication field intensity emulation of coverage capability methodsWireless communication platform.
Advantages of the present invention and good effect are as follows: the present invention is having existing field strength measurement by communication field intensity measurement moduleWhile technology carries out the ability of field strength measurement for radio frequency tone signal, it is also equipped with for widely used radio frequency tune in practiceSignal processed carries out the ability of field strength measurement, and in the case where radio signal environment is increasingly complicated, the present invention has stronger letterNumber adaptability；Using signal bandwidth measuring technique, this survey the present invention can with automatic measurement signal bandwidth for subsequent field strengthAmount provides the range of frequency bandwidths of power spectral integral, therefore the present invention can carry out automation field strength for the signal of different bandwidth and surveyAmount；Meanwhile the longitude and latitude position point of multiple base stations being mapped on plane domain by Field strength coverage computing module, constitute planeBase station point set is handled the base station point set with the algorithm of plane geometry, regardless of the topography and geomorphology factor of base station, letterWireless field density covering area range that is single, quickly determining base station or cell.
The present invention combines multi signal composition algorithm and characteristic value detection algorithm, constructs new detection statistic,Any prior information of undesired signal does not require multiple reception noises to meet the equal condition of power, while overcoming noisePower uncertainty influences, and belongs to total blindness's signal detection algorithm.The present invention carries out field strength data using second order approximate algorithm excellentChange, can effectively improve field strength data using degree.
Specific embodiment
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and cooperate attached drawingDetailed description are as follows.
Structure of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, realization wireless network communication field intensity emulation of coverage capability system provided in an embodiment of the present invention includes: signalDetection module 1, communication field intensity measurement module 2, main control module 3, model of place building module 4, Field strength coverage computing module 5, numberAccording to optimization module 6, display module 7.
Signal detection module 1 is connect with main control module 3, for detecting wireless communication signal by signal detector；
Communication field intensity measurement module 2 is connect with main control module 3, for measuring wireless communication by field strength measurement deviceField strength data；
Main control module 3 is covered with signal detection module 1, communication field intensity measurement module 2, model of place building module 4, field strengthLid computing module 5, data-optimized module 6, display module 7 connect, and work normally for controlling modules by single-chip microcontroller；
Model of place constructs module 4, connect with main control module 3, for constructing wireless communication field by modeling softwareThe model of place being distributed by force；
Field strength coverage computing module 5 is connect with main control module 3, for the field strength by calculation procedure according to detectionData calculate wireless network communication field intensity overlay area；
Data-optimized module 6, connect with main control module 3, for optimizing processing to field strength data by optimizing program；
Display module 7 is connect with main control module 3, for showing signal of communication, field strength, scene mould by displayType, overlay area data.
2 measurement method of communication field intensity measurement module provided in an embodiment of the present invention is as follows:
(1) by rf modulated signal by being converted to 70MHz analog if signal after mixing and filtering；
(2) re-sampling obtains digital medium-frequency signal after 70MHz analog if signal being carried out variable gain amplification；
(3) zero-frequency digital baseband signal is obtained after digital medium-frequency signal being carried out Digital Down Convert；
(4) Fast Fourier Transform (FFT) is carried out to zero-frequency digital baseband signal and obtains its power spectrum, carried out further according to power spectrumBandwidth measurement obtains the bandwidth of zero-frequency digital baseband signal；
(5) power spectral integral in bandwidth is carried out to modulated signal, obtains rf modulated signal field strength.
5 calculation method of Field strength coverage computing module provided in an embodiment of the present invention is as follows:
(1) the full base station point set being mapped to the longitude and latitude of all base stations corresponding location point in plane；
(2) full base station point set is processed into subdivision triangle gridding；
(3) position in the center of circle of the circumscribed circle of the triangle in subdivision triangle gridding comprising same base point is determined, and willThe center of circle is sequentially connected the Thiessen polygon region that the region to be formed is determined as the base station；
(4) overlapping region of overlay area is initially justified in the Thiessen polygon region and the base station for determining base station, and will be overlappedThe range in region is determined as the wireless field density covering area range of base station；
(5) overlay area is cut using the azimuth of cell each in base station, determines the wireless of each cell in base stationField strength coverage region range.
In step (2), the step of full base station point set is processed into subdivision triangle gridding provided in an embodiment of the present inventionInclude:
1) three or three or more initial base station points are chosen and form current base station point set, determine the initial of initial base station pointConvex closure；It determines the triangle for meeting empty circle characteristic in initial convex closure, and triangle is added in triangle chained list；First primordium will be removedOther base sites other than website are sequentially inserted into current base station point set, per base sites are increased after being newly inserted into one, that is, are formed currentThe current convex closure of base station point set；
2) when after increase base sites inside the current convex closure, and at the inside for the triangle that convex closure includes, threeThe triangle is deleted in angular chained list, successively cuts open three in the triangle to purpose side when determining as purposeDivide processing；
3) when after increase base sites inside current convex closure, and when in the triangle edges that convex closure includes, in tripletThe triangle is deleted in table, successively by the triangle where rear increasing base sites in addition to while determine as purpose side, it is rightPurpose side carries out subdivision processing；
4) when rear increasing base sites are on current convex closure side, the triangle for increasing base sites after including is deleted in triangle chained listShape, by the triangle where rear increasing base sites in addition to while determines as purpose side, to the progress subdivision processing of purpose side；
5) when rear increasing base sites are at the outside of current convex closure, using any point on current convex closure as starting point, along convexPacket is found counterclockwise increases side of the base sites on the right side of it after making；When the quantity on side is one, this is determined while for purpose, by meshThe two-end-point on side be connected with the rear base sites that increase, form new current convex closure, and to the progress subdivision processing of purpose side；When number of edges amountWhen for two or more, the endpoint for the side chain that side is formed is chosen, endpoint is connected with rear increasing base sites, is formed new currentConvex closure, and successively determine while for purpose, subdivision processing successively is carried out to purpose side.
Purpose side subdivision processing step provided in an embodiment of the present invention specifically includes:
When purpose is in the current convex closure, by the purpose side and the rear triangle for increasing base sites and being formedIt is added in triangle chained list；
When the purpose side is inside the current convex closure, obtaining from triangle chained list includes the three of the purpose sideIt is angular, when the triangle is not in the purpose side and the rear circumscribed circle for increasing the triangle that base sites are formed, by the purposeSide and the rear triangle for increasing base sites formation are added in triangle chained list；Otherwise, when the triangle is in the purpose Bian YuhouWhen increasing in the circumscribed circle for the triangle that base sites are formed, cancels former purpose side, determine two except the purpose side in the triangleWhile for purpose, subdivision processing successively is continued to the purpose side, and the triangle is deleted from triangle chained list.
The determination step in the Thiessen polygon region of base sites provided by the invention includes:
Inquiry includes the triangle of same base point, association triangle is determined it as, when the base sites are described convexWhen the inside of packet, the center of circle of the circumscribed circle of the association triangle is sequentially connected the closed area to be formed and is determined as the base stationThe Thiessen polygon region of point；
When the base sites are on the side of the convex closure, by the center of circle successively phase of the circumscribed circle of the association triangleEven, side chain is formed；It determines the head end point of the side chain and the angle of tail point and base sites formation, determines that the angle of the angle is flatThe position of the intersection point of overlay area is initially justified in the extended line of separated time and base station, by the intersection point and the head end point and tail point phaseThe region even formed is determined as the Thiessen polygon region of the base sites.
As shown in Fig. 2, realization wireless network communication field intensity covering method provided in an embodiment of the present invention includes:
S101: logical using the signal detector detection wireless network of the signal detection algorithm based on Optimum combining and characteristic valueBelieve signal；
S102: wireless network communication field intensity intensity data is measured using field strength measurement device；
S103: the model of place of modeling software building wireless network communication field intensity distribution is utilized；
S104: wireless network communication field intensity overlay area is calculated according to the field strength data of detection using calculation procedure；
S105: processing is optimized to field strength data using the optimization program based on second order approximatioss；
S106: signal of communication, field strength, model of place, overlay area data are shown using display.
In step S101, the signal detection algorithm provided in an embodiment of the present invention based on Optimum combining and characteristic value is specifically wrappedIt includes:
(1) collected wireless communication signal is done into discrete Fourier transform, and in frequency domain using maximization outputThe criterion of signal power determines a best initial weights, then merges multiple signals with best initial weights；
(2) real part of data after merging is taken, autocorrelation matrix R is constructedy(Ns)；
(3) all characteristic values for seeking matrix Ry (Ns), then acquire detection statistic T according to corporal；
Tr (R in formulay(Ns)) be composite signal autocorrelation matrix mark, i.e. the sum of all characteristic values of matrix, by matrixThe ratio between mark and minimal eigenvalue are used as detection statistic；
(4) following formula is combined, the theoretical detection threshold γ under specific false-alarm probability is calculated；
F in formula1For the cumulative distribution function that Tracy-Widom the 1st is distributed, there is no expression formula form, the function is correspondingValue is acquired by tabling look-up, and the 1st distribution values table of Tracy-Widom is as follows:
The practical false-alarm probability of 1 different theories value of table
| t | -3.90 | -3.18 | -2.78 | -1.91 | -1.27 | -0.59 | 0.45 | 0.98 |
| F1(t) | 0.01 | 0.05 | 0.10 | 0.30 | 0.50 | 0.70 | 0.90 | 0.95 |
(5) adjudicate: if T > γ, there are signal, affirmative judgements in channel；Otherwise signal, negative decision is not present.
In step S105, second order provided in an embodiment of the present invention approaches data optimization algorithm and includes:
The numerical method that general loss function optimizes derives from Taylor expansion, the Taylor expansion of the function of many variablesAre as follows:
Second order expension is carried out to loss function:
The necessary condition that loss function obtains minimum value is:
Finally obtain the iterative formula of β:
When the invention works, believe firstly, detecting wireless communication using signal detector by signal detection module 1Number；Wireless network communication field intensity intensity data is measured using field strength measurement device by communication field intensity measurement module 2；Secondly, master controlModule 3 constructs module 4 by model of place and constructs the model of place that wireless network communication field intensity is distributed using modeling software；Pass throughField strength coverage computing module 5 calculates the wireless network communication field intensity area of coverage according to the field strength data of detection using calculation procedureDomain；Then, processing is optimized to field strength data using optimization program by data-optimized module 6；Finally, passing through display module7 show signal of communication, field strength, model of place, overlay area data using display.
The above is only the preferred embodiments of the present invention, and is not intended to limit the present invention in any form,Any simple modification made to the above embodiment according to the technical essence of the invention, equivalent variations and modification, belong toIn the range of technical solution of the present invention.