In this paper, a novel and efficient scheme for jamming the Universal Mobile Telecommunications System (UMTS)\nsignal without the assistance from the base station or operator is proposed and evaluated. The scheme is based on\nnew orthogonal multi-sequences developed in this paper. These sequences are specially designed to interfere all the\nOrthogonal Variable Spread Factor (OVSF) codes that are used in the UMTS transmission and thus, any signal spread\nby these multi-sequences will interfere all the transmitted data channels at the same time. A power gain of about 7 dB\nis obtained with respect to the traditional jamming method based on high power wide-band noise injection can be\nobtained when no channel is used and 10.4 dB in a more realistic scenario with multipath Rayleigh channel.
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