CN109660935B - A kind of interference localization method of base station side array antenna system - Google Patents

Abstract

The invention discloses an interference positioning method for an array antenna system on the base station side. By regularly shutting down the data transmission of the base station and the user, and simultaneously receiving the interference information, the interference direction of the base station side is determined by the DOA method, and the user reports the received interference power to the base station. , so as to jointly judge and calculate the interference location area and power according to the interference information received by the base station and the user, this method can effectively locate the interference location area, and does not need to add additional testing equipment, does not need to perform manual inspection, saves manpower and material resources, and can effectively locate the interference location. Area and transmit power; the method for locating the interference position has low algorithm complexity and is suitable for the communication system of the array antenna on the base station side.

Description

A kind of interference localization method of base station side array antenna system

technical field

The present invention relates to the field of communications, and in particular, to a method for locating interference of a base station side array antenna system.

Background technique

The sharing characteristics of wireless channels make wireless networks vulnerable to threats such as intra-network self-interference or inter-system interference. In order to effectively deal with jamming attacks, researchers at home and abroad have proposed methods including channel-level, link-level and network-level from the perspectives of physical layer communication mode, link layer scheduling strategy, network layer routing algorithm and application layer QoS adjustment. Interference cancellation or avoidance methods. In contrast, there is less research on how to effectively locate the interference source in order to eliminate the interference threat from the source. At present, the commonly used method for locating the interference source is the manual access to the station interference investigation method. This method usually uses a directional antenna (Yagi antenna, logarithmic period antenna, flat panel directional antenna, etc.) to measure the signal direction, and is equipped with a high-performance spectrum detection device to observe the shape of the detected signal wave. For a long phenomenon, the tester will turn the antenna and orient it at the measurement site. By measuring the interfering signal using directional antennas at several locations, the location of the source of the interference can be roughly determined. The manual inspection method has the following shortcomings: (1) the measurement steps are cumbersome and the efficiency is low; (2) the number of base stations constructed at the same site is large, and the inspection workload is large; (3) the measurement signal is a time-varying signal, which is affected by accidental circumstances, and the results exist error.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for locating the interference of the base station side array antenna system with small error and high efficiency.

In order to achieve the above object, the present invention provides the following technical solutions: a method for locating interference for an array antenna system on the base station side, which is characterized in that it includes the following steps:

Step 1. The user reports location information;

Step 2, the base station and the user periodically stop information transmission, and only receive interference information;

Step 3, the base station judges the direction of the interference signal by the DOA method;

Step 4, the user reports the received interference power;

Step 5. If there is a user whose interference power is not greater than that of the base station, select one such user at random, and proceed to step 6; otherwise, randomly select a user whose interference power is greater than that of the base station, and proceed to step 7;

Step 6, according to the interference power received by the base station, the user interference power selected in step 5, the path loss model, and the estimated interference direction of the base station, jointly calculate and determine the interference location, output the determined interference location area, and enter step 8 after the calculation is completed;

Step 7. The selected user interference power is greater than the base station interference power;

Step 8: Calculate the interference transmission power according to the interference position, the interference received power and the path loss model.

Further, the step 7 also includes the following steps:

7a. Jointly calculate the interference position according to the interference power received by the base station, the user interference power selected in step 5, the path loss model, and the estimated interference direction of the base station. At this time, there are two calculation results of the interference position area;

7b. Select another user from the unselected users, verify the two interference location areas calculated in step 7a according to the received power and path loss model, and output the determined interference location area. If the verification of the two areas is correct, then Reselect two additional users to authenticate.

Compared with the prior art, the present invention has the following beneficial effects: no manual investigation is required, manpower and material resources are saved, and the interference location area and transmission power can be effectively located; the method for locating the interference location has low algorithm complexity and is suitable for the base station side Array antenna for communication systems.

Description of drawings

Fig. 1 is a schematic diagram when the interference is close to the user;

Fig. 2 is a schematic diagram when the interference is relatively close to the base station;

Fig. 3 is a model diagram of the situation shown in Fig. 1;

Figure 4 is a model diagram of the situation represented by Figure 2;

FIG. 5 is a schematic flow chart of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to Figures 1 to 5, this specific embodiment discloses a method for locating interference for an array antenna system on the base station side. The interference system model is shown in Figures 1 and 2. Figure 1 shows the situation where the interference is close to the user, and Figure 2 shows the interference Close to the base station. Assuming that the base station side is an array antenna, the base station and the user periodically stop data transmission and perform interference reception. The user reports the received interference information to the base station, and locates the interference by processing the received interference. The whole system consists of module 101, module 102, module 103 and module 104. Module 101 is an array antenna base station, which is mainly used for receiving interference and estimating the direction of interference; Notebook, etc.; module 103 is interference, that is, the part that needs to be positioned for this solution; module 104 is a wireless communication link, and its main function is to transmit wireless signals. Figures 3 and 4 are mathematical models corresponding to Figures 1 and 2, respectively.

As shown in Figure 5, it is a flowchart of the method for locating the interference of the array antenna system on the base station side, which specifically includes the following steps:

Step 1. The user reports location information;

Step 2, the base station and the user periodically stop information transmission, and only receive interference information, the base station receives the interference power as P _B , and the user m receives the interference power as P _m ;

Step 3. The base station estimates the direction of the interference signal through the DOA method, as shown in the BI rays in Figures 3 and 4;

Step 4, the user reports the power of the received interference;

Step 5. If there is a user whose interference power is not greater than the interference power of the base station, that is, there is a user m, such that the received interference power P _m ≤ P _B , then randomly select such a user, and enter step 6, otherwise, randomly select a user whose interference power is greater than or equal to P B . User m of the base station, go to step 7;

Step 6: Establish a coordinate system based on the plane where the base station and the user are located. The location of the user m is the point U _m , and the location of the base station is the point B, as shown in FIG. 3 . According to the received interference power P _B of the base station, the interference power P _m of the user m selected in step 5, the path loss model, and the estimated interference direction of the base station, jointly calculate and determine the interference position, and the specific process is as follows:

Different path loss models are selected according to different environments, and the Hata-Okumura model is selected here, then:

P _T -P _m =69.55+26.16lgf-13.82lght-α(hm)+(44.9-6.55lght)*lgd _m (1)

P _T -P _B =69.55+26.16lgf-13.82lght-α(hB)+(44.9-6.55lght)*lgd _B (2)

Wherein: P _T is the interference transmit power;

f is the frequency of the interference signal;

ht is the effective height of the interference antenna (m);

hm is the effective height of the user antenna (m);

_dB is the distance (km) between the interference and the base station;

α is the receiving antenna height factor;

Formula (1) minus formula (2) is sorted out:

Taking ht=30m and ht=200m into the above equation respectively, the ratio λ between the user-to-interference distance and the base-station-to-interference distance can be obtained when the interference height is between 30 and 200m, and:

When λ=1, according to mathematical knowledge, the interference is located on the vertical line between the user and the base station, and the intersection with the ray BI is the location of the interference, and the interference location can be uniquely determined at this time;

When λ>1, according to mathematical knowledge, the trajectory to the point with a constant distance ratio between the two fixed points is a circle, and the trajectory circle is located on the right side, as shown in Figure 3, the two circles represent the interference heights at the two extreme values. The position is the shaded area between the ray BI and the intersection of the two circles, and the interference position area can be uniquely determined at this time;

After the calculation is completed, go to step 8;

Step 7. If the selected user interference power is greater than the base station interference power, the following two steps are required.

7a. Establish a coordinate system based on the plane where the base station and the user are located. The location of the user m is the point U _m , and the location of the base station is the point B, as shown in FIG. 4 . According to the received interference power of the base station, the user interference power selected in step 5, the path loss model, and the estimated interference direction of the base station, the interference position is jointly calculated.

At this time, it is the same as step 6. According to the path loss model, the ratio λ between the user-to-interference distance and the base-station-to-interference distance can be obtained and:

根据数学知识可知，到两定点距离比值恒定的点的轨迹为圆，当λ＜1时，轨迹圆位于左侧，如图4所示。两圆分别表示干扰高度在两极限值情况，干扰所在位置即为射线BI与两圆交点处之间得阴影部分区域，由于两区域在基站同侧，无法排除错误干扰，此时需进一步验证；

According to mathematical knowledge, the trajectory to a point with a constant distance ratio between two fixed points is a circle. When λ<1, the trajectory circle is on the left side, as shown in Figure 4. The two circles represent the interference heights at the two extreme values, respectively. The location of the interference is the shaded area between the ray BI and the intersection of the two circles. Since the two areas are on the same side of the base station, the erroneous interference cannot be ruled out, and further verification is required at this time;

7b. Select another user n from the unselected users, and verify the two interference location areas calculated in step 7a according to the received power and path loss model, so as to determine the correct interference location area. If it is verified that the two areas in step 7a are correct, it means that the two users are symmetrical about the base station interference connection, and step 7b needs to be performed again;

Step 8: Estimate the interference transmit power according to the interference position, the interference received power and the path loss model.

The present invention can automatically perform positioning or manual operation through the system, thereby eliminating the need for manual investigation, saving manpower and material resources, and for the system with the base station side as the array antenna, it can effectively locate the interference location area and transmit power; use the base station to receive interference information combined with The interference information received by the user terminal is used to locate the interference position, and the algorithm complexity is low, which is suitable for the communication system of the array antenna on the base station side, and does not require additional testing equipment.

Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the foregoing embodiments, or to perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (2)

1. An interference positioning method of a base station side array antenna system is characterized by comprising the following steps:

step 1, reporting position information by a user;

step 2, the base station and the user stop sending the information at regular time and only receive the interference information;

step 3, the base station judges the direction of the interference signal by a DOA method;

step 4, the user reports the received interference power;

step 5, if users with interference power not larger than that of the base station exist, one user is randomly selected, and the step 6 is carried out, otherwise, users with interference power larger than that of the base station are randomly selected, and the step 7 is carried out;

step 6, according to the interference power received by the base station, the user interference power selected in the step 5, the path loss model and the interference direction judged by the base station, jointly calculating and determining the interference position, and outputting a region for determining the interference position, the specific process is as follows:

selecting different path loss models according to different environments, wherein a Hata-Okumura model is selected, and then:

P_T-P_m＝69.55+26.16lgf-13.82lght－α(hm)+(44.9-6.55lght)*lgd_m (1)

P_T-P_B＝69.55+26.16lgf-13.82lght－α(hB)+(44.9-6.55lght)*lgd_B (2)

wherein P is_TTransmitting power for the interference;

f is the interference signal frequency;

ht is the effective height (m) of the interference antenna;

hm is the effective height (m) of the user antenna;

d_Bdistance (km) between interference and base station;

alpha is a receiving antenna height factor;

(1) the formula is reduced by the formula (2) to obtain:

substituting ht-30 m and ht-200 m into the above equations, respectively, can obtain a value of a ratio λ between a user-to-interference distance and a base station-to-interference distance when the interference height is between 30 and 200m, and:

when the lambda is 1, according to mathematical knowledge, the interference is located on a user and a base station perpendicular line, the intersection point of the interference and the ray BI is the position of the interference, and the interference position can be uniquely determined at the moment;

when lambda is larger than 1, the locus of a point with constant distance ratio to two fixed points is a circle and is positioned on the right side according to mathematical knowledge, the two circles respectively represent the situation that the interference height is at two limit values, the position of the interference is a shadow part area between the intersection point of a ray BI and the two circles, and at the moment, the interference position area can be uniquely determined; after the calculation is finished, entering step 8;

step 7, selecting the interference power of the user to be larger than the interference power of the base station;

and 8, calculating interference transmitting power according to the interference position, the interference receiving power and the path loss model.

2. The method as claimed in claim 1, wherein the step 7 further comprises the steps of:

7a, estimating interference directions according to the interference power received by the base station, the user interference power selected in the step 5, a path loss model and the base station, and calculating interference positions in a combined manner, wherein the number of the interference position area calculation results is two;

and 7b, selecting one user from the unselected users, verifying the two interference position areas obtained by calculation in the step 7a according to the received power and the path loss model, outputting and determining the interference position area, and if the two areas are verified correctly, re-selecting two other users for verification.

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