CN108259099B - Electromagnetic radiation prediction method for TD-SCDMA base station - Google Patents
Electromagnetic radiation prediction method for TD-SCDMA base station Download PDFInfo
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Abstract
The invention discloses a TD-SCDMA base station electromagnetic radiation prediction method, which comprises the following steps: the method comprises the steps of taking TD-SCDMA base station electromagnetic radiation historical data as training data, decomposing the training data through DB3 and COIF3 wavelets, obtaining a low-frequency sequence R and a high-frequency sequence T through DB3 wavelet decomposition, obtaining a low-frequency sequence Q and a high-frequency sequence U through COIF3 wavelet decomposition, inputting the low-frequency sequence R, the high-frequency sequence T, the low-frequency sequence Q and the high-frequency sequence U into prediction models respectively for training, and performing combined prediction on TD-SCDMA base station electromagnetic radiation through the trained prediction models. The invention analyzes the electromagnetic radiation prediction mode of the TD-SCDMA base station, and the method can accurately and reliably predict and evaluate the electromagnetic radiation of the TD-SCDMA base station and has certain social benefit.
Description
Technical Field
The invention relates to a TD-SCDMA base station electromagnetic radiation prediction method.
Background
At present, when electromagnetic radiation around a communication base station is predicted, a trained prediction model is usually used for prediction. For example, application No. 2018100095052 discloses a method for predicting electromagnetic radiation of a GSM base station, in the prediction of electromagnetic radiation of a base station, a prediction model is trained first, and then the trained model is used for prediction, but in the prediction, because the model uses a single prediction model, the single prediction model is not stable enough to be influenced by interference in the prediction process, and simultaneously, because the electromagnetic radiation of a TD-SCDMA base station changes violently, the model is not easy to predict.
Aiming at the defects in the prior art, the method combines the regular characteristics of the electromagnetic radiation sequence of the TD-SCDMA base station, takes the electromagnetic radiation historical data of the TD-SCDMA base station as training data to train the model, firstly decomposes the training data through DB3 and COIF3 wavelets, the decomposition layer number is 1, decomposes the DB3 wavelets to obtain a low-frequency sequence R and a high-frequency sequence T, decomposes the COIF3 wavelets to obtain a low-frequency sequence Q and a high-frequency sequence U, then respectively inputs the low-frequency sequence R, the high-frequency sequence T, the low-frequency sequence Q and the high-frequency sequence U into a prediction model to train, and then carries out combined prediction on the electromagnetic radiation of the TD-SCDMA base station by the trained prediction model.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a method for predicting electromagnetic radiation of a TD-SCDMA base station.
The technical scheme for solving the technical problems comprises the following steps:
1) taking TD-SCDMA base station electromagnetic radiation historical data as training data, decomposing the training data through DB3 and COIF3 wavelets, wherein the number of decomposition layers is 1, obtaining a low-frequency sequence R and a high-frequency sequence T through DB3 wavelet decomposition, and obtaining a low-frequency sequence Q and a high-frequency sequence U through COIF3 wavelet decomposition;
2) inputting the low-frequency sequence R, the high-frequency sequence T, the low-frequency sequence Q and the high-frequency sequence U obtained in the step 1) into a prediction model for training to obtain a parameter omega of the prediction model1、b1、c1,ω2、b2、c2,ω3、b3、c3,ω4、b4、c4;
3) Inputting the input data in the prediction into the prediction model trained in the step 2) respectively to predict the high-frequency sequence and the low-frequency sequence, wherein the expression is as follows:
wherein, ω is1、b1、c1,ω2、b2、c2,ω3、b3、c3,ω4、b4、c4For the prediction model parameters obtained by the training of step 2), xRiLow frequency sequence obtained by DB3 wavelet decomposition for historical data before predicted point, and the unit is V/m, xTiHigh frequency sequence obtained by DB3 wavelet decomposition for historical data before predicted point, and the unit is V/m, xQiLow frequency sequence obtained by wavelet decomposition of COIF3 for historical data before predicted point, and the unit is V/m, xUiHigh frequency sequence obtained by wavelet decomposition of COIF3 for historical data before predicted point, and the unit is V/m, yRFor a low frequency sequence xRiThe unit of the predicted value of (a) is V/m, yTIs a high frequency sequence xTiThe unit of the predicted value of (a) is V/m, yQFor a low frequency sequence xQiThe unit of the predicted value of (a) is V/m, yUIs a high frequency sequence xUiThe unit of the predicted value of (2) is V/m;
4) and performing combined prediction according to the high and low frequency prediction values obtained by training in the step 3), wherein the combined prediction expression is as follows:
yDB3=yR+yT (5)
yCOIF3=yQ+yU (6)
y=(yDB3+yCOIF3)/2 (7)
wherein, yDB3For wavelet decomposition by DB3, the low frequency sequence prediction value y with 1 decomposition levelRAnd the high frequency sequence prediction value yTThe sum of the predicted values is in units of V/m, yCOIF3For wavelet decomposition by COIF3, the low frequency sequence prediction value y with 1 decomposition levelQAnd the high frequency sequence prediction value yUThe unit of the predicted value obtained by summation is V/m, y is the combined predicted value of the proposed model, and the unit is V/m.
In the above method for predicting electromagnetic radiation of TD-SCDMA base station, in step 2), the prediction model is as follows:
in the above equation (8), n pieces of history data are decomposed by DB3 wavelet, the number of decomposition layers is 1, the obtained low frequency sequence R is input to the prediction model, and training is performed to obtain the optimal prediction model parameter ω1、b1、c1The parameter ω1、b1Is assigned a value ofRandom number between 1 and 1, and inputting training data into training model to obtain parameter c1To determine the model parameter ω1、b1、c1;
In the above formula (9), n pieces of history data are decomposed by DB3 wavelet, the number of decomposition layers is 1, the obtained high frequency sequence T is input to the prediction model, and training is performed to obtain the optimal prediction model parameter ω2、b2、c2The parameter ω2、b2Assigning a random number between-1 and 1, and inputting training data into a training model to obtain a parameter c2To determine the model parameter ω2、b2、c2;
In the above equation (10), n pieces of history data are decomposed by COIF3 wavelet, the number of layers is 1, the obtained low-frequency sequence Q is input into the prediction model, and training is performed to obtain the optimal prediction model parameter ω3、b3、c3The parameter ω3、b3Assigning a random number between-1 and 1, and inputting training data into a training model to obtain a parameter c3To determine the model parameter ω3、b3、c3;
In the above formula (11), n pieces of history data are decomposed by COIF3 wavelet, the number of decomposition layers is 1, the obtained high frequency sequence U is input into the prediction model, and training is performed to obtain the optimal prediction model parameter ω4、b4、c4The parameter ω4、b4Assigning a random number between-1 and 1, and inputting training data into a training model to obtain parametersNumber c4To determine the model parameter ω4、b4、c4。
The invention has the beneficial effects that: decomposing the electromagnetic radiation historical data of the TD-SCDMA base station into a low-frequency sequence and a high-frequency sequence by decomposing DB3 and COIF3 wavelets with the number of layers being 1 so that the electromagnetic radiation of the base station with violent change becomes gentle and convenient for prediction, training the low-frequency sequence and the high-frequency sequence obtained by decomposition through a prediction model, and performing combined prediction on the electromagnetic radiation of the TD-SCDMA base station through the trained prediction model. The established model can accurately and reliably predict the electromagnetic radiation of the TD-SCDMA base station, and the method has good reference value for base station construction and environmental protection and has certain social benefit.
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FIG. 1 is a flow chart of the present invention.
Detailed Description
The present embodiment is performed on the premise of the present disclosure, and detailed implementation procedures are given, but the scope of the present disclosure is not limited to the following embodiments.
In the experiment place, in an open and flat area, the implementation object is a teaching building roof base station, the experimental apparatus is a spectrum analyzer AT6024D, and the measurement object is a TD-SCDMA base station.
The invention is further described below with reference to the figures and examples.
Fig. 1 is a block diagram of the technical scheme of the invention, and the specific steps are as follows:
step 1): the method comprises the steps of taking TD-SCDMA base station electromagnetic radiation historical data as training data, decomposing the training data through DB3 and COIF3 wavelets, wherein the number of decomposition layers is 1, obtaining a low-frequency sequence R and a high-frequency sequence T through DB3 wavelet decomposition, and obtaining a low-frequency sequence Q and a high-frequency sequence U through COIF3 wavelet decomposition.
In the embodiment, the electromagnetic radiation history data of the TD-SCDMA base station is taken as training data, 12 history data are taken as training data, decomposition is performed by decomposing DB3 and COIF3 wavelets with the number of layers of 1, 12 low-frequency sequences R and 12 high-frequency sequences T are obtained by decomposing DB3 wavelets with the number of layers of 1, and 12 low-frequency sequences Q and 12 high-frequency sequences U are obtained by decomposing COIF3 wavelets with the number of layers of 1.
Step 2): inputting the low-frequency sequence R, the high-frequency sequence T, the low-frequency sequence Q and the high-frequency sequence U obtained in the step 1) into a prediction model for training to obtain a parameter omega of the prediction model1、b1、c1,ω2、b2、c2,ω3、b3、c3,ω4、b4、c4。
In this embodiment, the low-frequency sequence R, the high-frequency sequence T, the low-frequency sequence Q, and the high-frequency sequence U obtained in step 1) are taken as training data, and are respectively input to a model for training, and when the model is trained by the low-frequency sequence R, R is used for training the model1,i=[0.197623,0.202044,...,0.191881],i=1,2,...,12,yR=[0.188432]The following model is input:
in the above equation (12), the history data is wavelet-decomposed by DB3 with the number of decomposition layers being 1, and the obtained low frequency sequence R is input to the prediction model while the parameter ω is input1And b1Assigned as a random number between-1 and 1, ω1Assigned value of 0.8129, b1The assignment is 0.2119 training to obtain the prediction model parameter c1=-0.62911;
When the high-frequency sequence T trains the model, the T is used1,i=[-0.00093,-0.00041,...,0.002599],i=1,2,...,12,yT=[-0.00058]The following model is input:
in the above equation (13), the history data is wavelet-decomposed by DB3 with the number of decomposition layers being 1, and the obtained high-frequency sequence T is input to the prediction model, while the parameter ω is input2And b2Assigned as a random number between-1 and 1, ω2Assigned value of 0.6213, b2Assignment of valueObtaining prediction model parameters c for 0.3175 training2=-0.3248;
When the low-frequency sequence Q trains the model, Q is used1,i=[0.196319,0.201446,...,0.192642],i=1,2,...,12,yQ=[0.190339]The following model is input:
in the above equation (14), the history data is decomposed into 1 number of layers by the COIF3 wavelet, the obtained low frequency sequence Q is input to the prediction model, and the parameter ω is input at the same time3And b3Assigned as a random number between-1 and 1, ω3The value is-0.2315, b3The assignment is 0.2614 training to obtain the prediction model parameter c3=0.717792;
When the model is trained by the high-frequency sequence U, the U is trained1,i=[0.000371,-0.00012,...,0.001838],i=1,2,...,12,yu=[-0.00249]The following model is input:
in the above equation (15), the history data is decomposed by the COIF3 wavelet, the number of layers is 1, the obtained high frequency sequence U is input to the prediction model, and the parameter ω is input4And b4Assigned as a random number between-1 and 1, ω4Assigned value of 0.2755, b4The assignment is 0.3145 training to obtain the prediction model parameter c4=-0.3125。
Step 3), inputting the input data in prediction into the prediction model trained in step 2) respectively to predict high and low frequency sequences, wherein the expression is as follows:
wherein, ω is1、b1、c1,ω2、b2、c2,ω3、b3、c3,ω4、b4、c4For the prediction model parameters obtained by the training of step 2), xRiLow frequency sequence obtained by DB3 wavelet decomposition for historical data before predicted point, and the unit is V/m, xTiHigh frequency sequence obtained by DB3 wavelet decomposition for historical data before predicted point, and the unit is V/m, xQiLow frequency sequence obtained by wavelet decomposition of COIF3 for historical data before predicted point, and the unit is V/m, xUiHigh frequency sequence obtained by wavelet decomposition of COIF3 for historical data before predicted point, and the unit is V/m, yRFor a low frequency sequence xRiThe unit of the predicted value of (a) is V/m, yTIs a high frequency sequence xTiThe unit of the predicted value of (a) is V/m, yQFor a low frequency sequence xQiThe unit of the predicted value of (a) is V/m, yUIs a high frequency sequence xUiThe unit of the predicted value of (2) is V/m.
In this embodiment, input data during prediction is input into the prediction model trained in step 2), and high and low frequency sequences are predicted for 14 times, and predicted values are obtained as shown in the following table:
TABLE 1 prediction of high and low frequency sequences
y R | 0.2 123 8 | 0.2 149 61 | 0.2 186 3 | 0.2 245 95 | 0.2 205 02 | 0.2 133 21 | 0.2 137 27 | 0.2 148 49 | 0.2 135 5 | 0.2 196 35 | 0.2 134 73 | 0.2 113 62 | 0.2 128 88 | 0.212662 |
y T | 0.0 006 4 | - 0.0 001 2 | - 0.0 002 2 | 0.0 006 45 | - 0.0 007 9 | 8.8 9E- 05 | 0.0 003 33 | - 0.0 013 1 | 0.0 018 | 0.0 004 05 | - 0.0 014 6 | 0.0 006 18 | 0.0 001 32 | -0.00056 |
y Q | 0.1 835 91 | 0.1 884 21 | 0.1 951 96 | 0.1 961 14 | 0.1 942 89 | 0.1 897 28 | 0.1 858 98 | 0.1 890 25 | 0.1 931 45 | 0.1 919 14 | 0.1 892 13 | 0.1 876 63 | 0.1 868 47 | 0.18827 |
y U | 0.0 036 82 | 0.0 005 74 | - 0.0 027 6 | 0.0 031 21 | - 0.0 005 4 | - 0.0 021 9 | 0.0 022 68 | - 0.0 013 4 | - 0.0 007 7 | 0.0 022 09 | - 0.0 003 6 | - 0.0 012 1 | 0.0 003 6 | 0.000988 |
Step 4): performing combined prediction according to the high and low frequency prediction values obtained by training in the step 3), wherein the combined prediction expression is as follows:
yDB3=yR+yT (20)
yCOIF3=yQ+yU (21)
y=(yDB3+yCOIF3)/2 (22)
wherein, yDB3For wavelet decomposition by DB3, the low frequency sequence prediction value y with 1 decomposition levelRAnd the high frequency sequence prediction value yTThe sum of the predicted values is in units of V/m, yCOIF3For wavelet decomposition by COIF3, the low frequency sequence prediction value y with 1 decomposition levelQAnd the high frequency sequence prediction value yUThe unit of the predicted value obtained by summation is V/m, y is the combined predicted value of the proposed model, and the unit is V/m.
Substituting the high and low frequency predicted values obtained in the step 3) into the formulas (20) and (21) respectively to obtain yDB3、yCOIF3A value of (a) and then yDB3、yCOIF3The value of (a) is substituted for the formula (22) to obtain the value of y, wherein yDB3、yCOIF3The values of y are all set forth in the following table:
TABLE 2yDB3、yCOIF3Value of y
yDB3 | 0.21 242 | 0.21 484 | 0.21 8412 | 0.22 524 | 0.21 9712 | 0.21 341 | 0.21 406 | 0.21 354 | 0.21 835 | 0.22 004 | 0.21 471 | 0.21 198 | 0.21 242 | 0.2 121 |
yCOI F | 0.18 7273 | 0.18 8995 | 0.19 2436 | 0.19 9238 | 0.19 3749 | 0.18 7538 | 0.18 8266 | 0.18 7685 | 0.19 2405 | 0.19 4123 | 0.18 8853 | 0.18 6123 | 0.18 7207 | 0.1 892 5 |
y | 0.20 0147 | 0.20 1914 | 0.20 5426 | 0.21 2239 | 0.20 6732 | 0.20 0474 | 0.20 1133 | 0.20 0613 | 0.20 5377 | 0.20 7082 | 0.20 1481 | 0.19 9067 | 0.20 0113 | 0.2 021 4 |
Measuring Measurement of Value of | 0.20 20 | 0.20 38 | 0.20 73 | 0.21 42 | 0.20 86 | 0.20 24 | 0.20 24 | 0.20 25 | 0.20 73 | 0.20 90 | 0.20 37 | 0.20 09 | 0.20 20 | 0.2 041 |
The experimental results show that each predicted value is close to the measured value, and the electromagnetic radiation of the TD-SCDMA base station can be stably predicted at different times, which shows that the method can realize accurate and reliable prediction of the electromagnetic radiation of the TD-SCDMA base station, and simultaneously the experimental results verify the effectiveness of the method used by the invention.
Claims (2)
1. A TD-SCDMA base station electromagnetic radiation prediction method is characterized in that the method comprises the following steps:
1) taking TD-SCDMA base station electromagnetic radiation historical data as training data, decomposing the training data through DB3 and COIF3 wavelets, wherein the number of decomposition layers is 1, obtaining a low-frequency sequence R and a high-frequency sequence T through DB3 wavelet decomposition, and obtaining a low-frequency sequence Q and a high-frequency sequence U through COIF3 wavelet decomposition;
2) inputting the low-frequency sequence R, the high-frequency sequence T, the low-frequency sequence Q and the high-frequency sequence U obtained in the step 1) into a prediction model for training to obtain a parameter omega of the prediction model1、b1、c1,ω2、b2、c2,ω3、b3、c3,ω4、b4、c4;
3) Inputting the input data in the prediction into the prediction model trained in the step 2) respectively to predict the high-frequency sequence and the low-frequency sequence, wherein the expression is as follows:
wherein, ω is1、b1、c1,ω2、b2、c2,ω3、b3、c3,ω4、b4、c4For the prediction model parameters obtained by the training of step 2), xRiLow frequency sequence obtained by DB3 wavelet decomposition for historical data before predicted point, and the unit is V/m, xTiObtained by DB3 wavelet decomposition for historical data before predicted pointHigh frequency sequence with unit of V/m, xQiLow frequency sequence obtained by wavelet decomposition of COIF3 for historical data before predicted point, and the unit is V/m, xUiHigh frequency sequence obtained by wavelet decomposition of COIF3 for historical data before predicted point, and the unit is V/m, yRFor a low frequency sequence xRiThe unit of the predicted value of (a) is V/m, yTIs a high frequency sequence xTiThe unit of the predicted value of (a) is V/m, yQFor a low frequency sequence xQiThe unit of the predicted value of (a) is V/m, yUIs a high frequency sequence xUiThe unit of the predicted value of (2) is V/m;
4) and performing combined prediction according to the high and low frequency prediction values obtained by training in the step 3), wherein the combined prediction expression is as follows:
yDB3=yR+yT (5)
yCOIF3=yQ+yU (6)
y=(yDB3+yCOIF3)/2 (7)
wherein, yDB3For wavelet decomposition by DB3, the low frequency sequence prediction value y with 1 decomposition levelRAnd the high frequency sequence prediction value yTThe sum of the predicted values is in units of V/m, yCOIF3For wavelet decomposition by COIF3, the low frequency sequence prediction value y with 1 decomposition levelQAnd the high frequency sequence prediction value yUThe unit of the predicted value obtained by summation is V/m, y is the combined predicted value of the proposed model, and the unit is V/m.
2. The method of claim 1, wherein in step 2), the prediction model is as follows:
in the above equation (8), n pieces of history data are decomposed by DB3 wavelet, the number of decomposition layers is 1, the obtained low frequency sequence R is input to the prediction model, and training is performed to obtain the optimal prediction model parameter ω1、b1、c1The parameter ω1、b1Assigning a random number between-1 and 1, and inputting training data into a training model to obtain a parameter c1To determine the model parameter ω1、b1、c1;
In the above formula (9), n pieces of history data are decomposed by DB3 wavelet, the number of decomposition layers is 1, the obtained high frequency sequence T is input to the prediction model, and training is performed to obtain the optimal prediction model parameter ω2、b2、c2The parameter ω2、b2Assigning a random number between-1 and 1, and inputting training data into a training model to obtain a parameter c2To determine the model parameter ω2、b2、c2;
In the above equation (10), n pieces of history data are decomposed by COIF3 wavelet, the number of layers is 1, the obtained low-frequency sequence Q is input into the prediction model, and training is performed to obtain the optimal prediction model parameter ω3、b3、c3The parameter ω3、b3Assigning a random number between-1 and 1, and inputting training data into a training model to obtain a parameter c3To determine the model parameter ω3、b3、c3;
In the above formula (11), n pieces of history data are decomposed by COIF3 wavelet, the number of decomposition layers is 1, the obtained high frequency sequence U is input into the prediction model, and training is performed to obtain the optimal prediction model parameter ω4、b4、c4Will beParameter omega4、b4Assigning a random number between-1 and 1, and inputting training data into a training model to obtain a parameter c4To determine the model parameter ω4、b4、c4。
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