A recording and playback wireless signal blocking method

Abstract

The present invention provides a recording and playback type wireless signal blocking device, which includes a receiving antenna, a low noise amplifier, a down-conversion module, an analog-to-digital converter, an FPGA chip, a digital-to-analog converter, an up-conversion module, a power amplifier, and a transmitting antenna connected in sequence. The invention also provides a recording and playback type wireless signal blocking method, which greatly improves the shielding ability and reduces the realization cost.

Description

technical field [0001] The invention relates to a recording and playback type wireless signal blocking device and method. Background technique [0002] The rapid development and wide application of mobile communication technology have brought great convenience to people's life, but also brought many security risks. Usually, people need mobile phone communication to facilitate life and communication, but at some specific time and place, it is necessary to restrict mobile phone communication to achieve information confidentiality or limit illegal information exchange. Unauthorized mobile phone access needs to be restricted in confidential meeting places; in the examination room environment, in order to ensure the fairness of the test, radio signals need to be shielded to prevent cheating using mobile phones; in the field of anti-terrorism, mobile phone communication needs to be blocked to avoid A terrorist attack carried out by using mobile phones to remotely control bombs. ...

AI Technical Summary

Problems solved by technology

[0003] The traditional way of wireless signal shielding uses single-tone signals to perform cyclic scanning in the downlink frequency band of the corresponding system to achieve the purpose of deteriorating the downlink signal in the corresponding frequency band to achieve signal blocking, but there are major defects in the current mobile communication system. For example, in the 4G system, due to the multi-channel subcarrier concurrent scheme, this scheme basically cannot achieve the signal blocking effect

In 2G and 3G systems, the traditional jammer scheme also needs to make the shielding signal 15-25dB greater than the original field strength to achieve the signal blocking effect, the overall signal blocking effect is poor, and the space radiation is large

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