A wcdma signal shielding system

Abstract

A wideband code division multiple access (WCDMA) signal shielding system destroys a synchronous channel and a pilot channel by modulating interference signals with WCDMA base station features in the transmitted signals. The WCDMA signal shielding system comprises a 3rd generation telecommunication (3G) antenna, a radio frequency module, a baseband signal processing module, a constant temperature crystal oscillation clock module, a control system, a communication management system and a power supply module, wherein the 3G antenna is used for transceiving a WCDMA signal; the radio frequency module is used for up-converting, low-converting and amplifying power of the WCDMA signal; the baseband signal processing module is used for analyzing features of the WCDMA signal and generating a WCDMA interference signal; the constant temperature crystal oscillation clock module is used for providing clock benchmark for the baseband signal processing module and the radio frequency module; the control system is used for dynamically adjusting configuration parameters of a baseband interference signal or the radio frequency module; the communication management system is used for managing the control system, the radio frequency module and communication of the baseband signal processing module and configuring addresses and ports; and the power supply module is used for supplying power to the system through conversion of alternating current and direct current. The WCDMA signal shielding system has the advantages of being less in power consumption, long in inference distance and flexible in configuration.

Description

technical field [0001] The invention belongs to wireless signal interference shielding technology in mobile communication, and in particular proposes an efficient shielding device and system for WCDMA downlink signals. Background technique [0002] While the development of communication technology brings convenience to people's life, it also brings challenges to information security management and control. 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...

AI Technical Summary

Problems solved by technology

This method is more effective for the second-generation mobile communication systems GSM900, DCS1800, PHS1900, and CDMA800, but for the third-generation communication system, due to the adoption of the new technology of code division multiple access, the channel distinction is through the regular allocation. The traditional co-frequency carrier suppression interference can not distinguish the code division channel, the interference effect is not ideal, and the interference shielding range is small. The reason is that the code division multiple access technology itself has the advantage of anti-interference, through its high spread frequency gain to obtain high SNR for demodulation

Among the three 3G systems in my country, WCDMA has the highest spread spectrum gain. If the same-frequency carrier suppression technology is used to interfere with WCDMA mobile phones, due to its high spread spectrum gain of up to 25dB, considering the internal noise of the receiver and the demodulation signal Noise ratio requirements, its interference tolerance reaches 17dB, then the same-frequency carrier suppression jammer needs to transmit up to 50 times (10 times) than the base station at the same position 1.7 ) power can effectively suppress WCDMA mobile phones, higher transmission power not only wastes energy, but also has adverse effects on the human body and the surrounding environment

Images