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How to deal with the interference problem in the mobile communication system
Time:2020-10-29 Read: 145

1. Cross-zone interference and high upper side lobe suppression antenna

The lobe above the main beam of the base station antenna is called the upper side lobe, and the difference between the level of the upper side lobe and the level of the main beam is called the upper side lobe suppression. Generally, the network coverage is ended by the main beam of the base station antenna, and the upper side lobe above the main beam will point to the close sector. When the upper side lobe of the base station antenna cannot be suppressed, it will cause cross-area interference to the neighboring cell, even in severe cases. It will constitute a congestion of the receiver of the adjacent site, causing the site to be paralyzed.


In response to this problem, gps antenna manufacturers have launched a series of high side lobe suppression base station antenna products. The frequency bands cover all mainstream mobile communication frequency bands such as CDMA800, GSM900, DCS1800, PCS1900, WCDMA2100, and LTE2600, which can provide up to 20dB of upper side lobe suppression. Compared with the general base station antenna, the interference signal caused by the upper side lobe is reduced by more than 70%. This series of products has been installed in many national networks of operators in Japan, Thailand, India, etc., and has achieved excellent results.


 2. Co-site interference and high front-to-back ratio antenna

  With the continuous increase of mobile communication network standards and frequency bands, co-location of different mobile communication systems has become a general trend. The situation of installing several antennas on the same communication tower or even the same antenna pole is now very widespread. Because the space on the tower is small, the antennas are close to each other, and the base station transmit power is relatively large, the signal interference between different antennas is also very severe. In response to this problem, gps antenna manufacturers have introduced a series of high front-to-back ratio antennas. The frequency bands cover all mainstream mobile communication frequency bands such as CDMA800, GSM900, DCS1800, PCS1900, WCDMA2100, LTE2600, etc., which can provide a front-to-back ratio of up to 35dB, which can effectively reduce the system on the tower. Interference, greatly improving network functions, especially for WCDMA equivalent frequency networking system. In addition, the products of gps antenna manufacturers are also selected by many network operators to cover up along the border to deal with the problem of sky-high international roaming charges caused by the antenna backlobe covering the cross-border complaints from the public around the border.


3. High site concealment and large downtilt electric adjustable antenna

With the rapid economic development, the average height of buildings in modern cities has increased year by year, leading to the gradual increase in the height of urban sites. At the same time, with the gradual acceleration of the urbanization process, the urban population density is also increasing, the number of urban sites continues to increase, and the site distance is gradually shortened accordingly. The erection height H of the antenna, the cell coverage plan L, the downtilt angle φ of the antenna, and the straight beam width 2α of the antenna have the following definite connection: L=H/tan(φ-α).


Therefore, with the increase of the site height H and the decrease of the site distance L, the antenna needs to be set with a larger downtilt angle for correct network coverage, otherwise it will cause cross-area interference. In practical engineering applications, the antennas of certain sites are set to a downward tilt viewpoint of 20 degrees or even greater. However, the downtilt angle scheduling plan of a general ESC base station antenna is generally about 10 degrees, and a larger downtilt angle needs to be completed by the method of electronic downtilt combined with mechanical downtilt. For example, a 20-degree downtilt angle can be completed by 10 degrees electronic downtilt + 10 degrees mechanical downtilt. However, a large mechanical downtilt angle will cause severe deformation of the network coverage area, which is mainly reflected in the broadening of the horizontal beam width, resulting in a large switching area, causing interference to adjacent sectors, reducing network capacity, and bringing great network functions. Impact.


In response to this problem, gps antenna manufacturers have introduced large downtilt angle electronically adjustable antenna products. The downtilt scheduling plan can reach 5-25 degrees. The product supports all mainstream mobile communications such as GSM, WCDMA, CDMA, CDMA2000, TD-SCDMA, TD-LTE, etc. It can provide multi-system common antenna feeder, such as GSM+TD and other multi-port independent large downtilt electronically adjustable antenna products with different standard combinations. It is the first choice for mobile network operators for network placement in high site close-up scenarios. Treatment plan.

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