What is the principle used for mobile phone signal jammers?

What is the principle used for mobile phone signal jammers?

answer:

There are also many principles of mobile phone signal jammers, to name a few.

Common mullors are mobile phone signal shielding by transmitting interfering signals. By transmitting a high-power signal of a certain frequency, the surrounding electromagnetic environment is seriously damaged, and the mobile phone cannot obtain the signal from the base station normally, so as to achieve the purpose of shielding the mobile phone signal.

Under normal circumstances, when the mobile phone enters a cellular cell for the first time, the local cell base station will update the location of the mobile phone, and assign it temporary user information such as a new temporary mobile user identifier, and the mobile phone will determine the location of the cell after receiving the base station information. When the mobile phone shield works, it emits an interference signal, the interference signal on the base station broadcast channel frequency band effective signal formation interference, interference signal improves the mobile communication channel bit error rate, reduce the signal-to-noise ratio of the channel, thereby affecting the effective reception of the mobile phone to the base station broadcast information, when the signal-to-noise ratio is reduced to a certain extent. The mobile phone can not decode the broadcast information of the base station normally, thus losing contact with the base station, and the mobile phone cannot determine the service area where it is located many times, so the mobile phone in the interference area is displayed as no signal and not in the service area. [1]

The second is the pseudo base station mode. When this masker is run, it can force the user's mobile signal to be forced to connect to the device, so that it cannot connect to the public mobile communication network. [2]

There are also some new shields that use other principles to interfere with mobile phone signals, such as the pilot signal interference method. [3]

bibliography:

An Wenxing, Zou Peng, Li Panxing, et al. Research on electromagnetic radiation of mobile phone shield in examination room[J]. Communication Technology, 2010(1):4.

Nie Haobin. Principle analysis of mobile phone signal jammer and research on key technologies[J]. Fujian Computer, 2019, 35(7):2.

LIU Yuling. Discussion on LTE mobile phone signal jammer[J]. Electronics World, 2020(24):2.

by frost white