Abstract
In this paper, a novel and efficient scheme for jamming the Universal Mobile Telecommunications System (UMTS) signal without the assistance from the base station or operator is proposed and evaluated. The scheme is based on new orthogonal multi-sequences developed in this paper. These sequences are specially designed to interfere all the Orthogonal Variable Spread Factor (OVSF) codes that are used in the UMTS transmission and thus, any signal spread by these multi-sequences will interfere all the transmitted data channels at the same time. A power gain of about 7 dB is obtained with respect to the traditional jamming method based on high power wide-band noise injection can be obtained when no channel is used and 10.4 dB in a more realistic scenario with multipath Rayleigh channel.
Highlights
Mobile communications are one of the most used technologies nowadays and with largest penetration
Since there is a tradeoff between the correlation properties of the generated sequence and the number of Orthogonal Variable Spread Factor (OVSF) codes that is able to interfere, we propose the use of multi-sequences instead
The amount of interference that each multi-sequence is able to obtain over a specific channel depends on the correlation between the OVSF code used for spreading this channel and the multisequence
Summary
Mobile communications are one of the most used technologies nowadays and with largest penetration. There are many situations where mobile transmissions are prohibited or need to be eliminated for security reasons, such as in dignitary’s vehicles, penitentiaries, hospitals, or airplanes; and places where their use is annoying such as cinemas, theaters, or concert halls. For these reasons, it is important to provide inhibitors for such technologies. For Global System for Mobile (GSM), in [1] and [2], it is the operator, relying on an external equipment (the inhibitor) who inhibits the signal.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
