The indicators most concerned by mobile communication operators are coverage, capacity, and throughput. With the continuous development and popularization of mobile communications, the breadth and depth of network coverage have reached a fairly high level. But in actual operation, operators often receive complaints from customers like "Why does my phone have a signal, but I can't make a call?" "Why does my phone show that it is connected, but the download speed is 0?" Reduced network performance, directly affecting the user experience? In fact, the culprit behind is interference.
For wireless communication systems, all non-useful signals can be regarded as interference signals. The presence of interfering signals will directly reduce the signal-to-noise ratio (or carrier-to-interference ratio) of the system, resulting in a decrease in the capacity of the system and reducing the system throughput rate. However, as more and more mobile communication networks are deployed, and large-scale use of devices such as wireless local area networks and personal hotspots, the wireless network environment becomes more complex and the wireless interference situation becomes more and more serious. Therefore, suppressing interference signals and reducing their impact on network performance are issues that every mobile network operator must face.
Mobi antenna is committed to providing a full range of base station antenna solutions for global mobile operators and equipment manufacturers, and for different scenarios of mobile communication networks, launched a series of base station products to solve the interference problem in the system:
1. Cross-over 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 upper side lobe level and the main beam level is called upper side lobe suppression. Generally, the network coverage is completed by the main beam of the base station antenna. The upper side lobe above the main beam will point to the adjacent sector. When the upper side lobe of the base station antenna is not sufficiently suppressed, it will cause cross-cell interference to the adjacent cell. It will cause the receivers of the adjacent sites to block, resulting in the paralysis of the sites.
Schematic diagram of interference caused by upper side lobes
In response to this problem, Mobi Antenna has launched a series of high-side-lobe suppression base station antenna products. The frequency band covers all mainstream mobile communication frequency bands such as CDMA800, GSM900, DCS1800, PCS1900, WCDMA2100, and LTE2600. Compared with the common base station antenna, the interference signal caused by the upper side lobe is reduced by more than 70%. This series of products are deployed in large numbers in the national networks of operators such as Japan, Thailand, and India, and have received good results.
Vertical pattern of common base station antenna and high side lobe suppression antenna
2. Common site interference and high front-to-back ratio antenna
With the continuous increase of mobile communication network standards and frequency bands, the co-location of different mobile communication systems has become a general trend. It is very common to install several antennas on the same communication tower or even the same antenna pole. Due to the small space on the tower, the distance between the antennas is relatively short, and the base station transmission power is large, the mutual interference of signals between different antennas is also very serious. In response to this problem, Mobi Antenna has launched a series of high front-to-back ratio antennas. The frequency band covers all mainstream mobile communication frequency bands such as CDMA800, GSM900, DCS1800, PCS1900, WCDMA2100, and LTE2600. Interference can greatly improve network performance, especially for WCDMA equivalent frequency networking system. In addition, Mobilco's front-to-back antenna products are also covered by many network operators along the border to solve the problem of international roaming sky tariffs caused by the cross-border coverage of the antenna back lobes complained by the people around the national border.
3. High site coverage and large downtilt ESCs
With the rapid and 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 city sites. At the same time, with the gradual acceleration of the urbanization process, the urban population density is also increasing, the number of urban stations is increasing, and the distance between the stations is gradually shortening. It can be seen from the figure below that the erection height H of the antenna, the cell coverage area L, the downtilt angle φ with the antenna, and the vertical beam width 2α of the antenna have the following determined relationship: L = H / tan (φ-α).
Schematic diagram of the relationship between antenna installation height, downtilt angle and coverage distance
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