A locking device for a motor vehicle. A transmitting device, which is designed to send out a request signal into a surroundings of the motor vehicle in dependence on a predetermined triggering event, as well as a receiving device, which is designed to receive, within a predetermined time interval from the sending of the request signal in a predetermined frequency region, a response signal of a radio key from the surroundings, and a control device, which is designed, in event of a response signal received within the time interval, to unlock at least one lock of the locking device. An evaluation module is designed so that the transmitting device sends out an interference radio signal after the sending of the request signal within the time interval at least at one radio frequency lying outside the frequency region.

Generally discussed herein are systems, apparatuses, and methods for generating a replica of a first signal with a notch at one or more desired frequencies. In an example, an apparatus can include a pulse cataloger configured to analyze the first signal and to provide phase modulation information about the first signal, a direct digital synthesizer having an output and configured to modulate a second signal using the phase modulation information and to provide the second signal at the output. The second signal can include a representation of the first signal with a frequency notch at a particular center frequency within the bandwidth of the second signal.

A communication system is provided comprising a transmitter coupled to a switch, which is further coupled to at least two antennas for switching the transmit signal to one of the antennas, with no feedback. The communication system further comprises at least one receiver for receiving the transmitted signal. The communication system in the present invention is able to help mitigate the effects of multipath. Previous attempts to mitigate the effects of multipath suffer from various problems: increased complexity needed to measure channel parameters and a feedback loop to switch the transmit antenna based on the parameters. The system is particularly useful when deployed in a MAS system or a jamming system.

A wireless device and a wireless local area network (WLAN) signal receiving method, where the wireless device includes a receiver, a jamming circuit, an interference cancelling circuit, a first antenna, and a second antenna. The receiver is coupled to the first antenna and configured to detect a WLAN signal, the jamming circuit is coupled to the second antenna, an input end of the interference cancelling circuit is coupled to the second antenna, and an output end of the interference cancelling circuit is coupled to the first antenna. The jamming circuit is configured to send, using the second antenna, an interference signal on a channel on which the WLAN signal is located, and the interference cancelling circuit is configured to generate, based on the interference signal, a reconstruction signal cancelling the interference signal received by the first antenna, and provide the reconstruction signal at the output end.

A control method, a control apparatus and a device for preventing pseudo GNSS signal interference, and a storage medium are provided. The method includes: in response to detecting that a received GNSS signal includes a pseudo GNSS signal, restraining a time service system of a communication device from tracking the received GNSS signal; and removing the restraining on the time service system in response to detecting that the pseudo GNSS signal disappears.

The invention relates to a portable electronic signal generator, and in particular a programmable multi-waveform radiofrequency generator for use as battlefield decoy.

A method, a computer program, and a device for reducing interference of temporary communication resources used for a wireless communication between a transportation vehicle key and a transportation vehicle. The method includes determining whether interference of the temporary communication resources is present and switching off the device causing the interference or adjusting the use of the temporary communication resources for the wireless communication between the transportation vehicle key and the transportation vehicle in response to interference being present.

Example implementations relate to advertisements of a privacy protected device. For example, advertisements of the privacy protected device are jammed. Additionally dummy device advertisements are broadcasted. The dummy device advertisements include a reduced-information advertisement for the privacy protected device.

An electronic device includes first and second antennas, a magnetic stripe transmission (MST) integrated circuit (IC), and a processor. The first antenna is disposed between first and second surfaces of the electronic device and in parallel with the first and second surfaces of the electronic device. The first antenna outputs a signal in a first direction. The second antenna is disposed between the second surface of the electronic device and the first antenna and in parallel with the first and second surfaces of the electronic device. The second antenna outputs a signal in a second direction. The MST IC controls the first and second antennas. When a payment mode is executed, the processor controls the MST IC such that one of the first and second antennas outputs an MST signal and the other of the first and second antenna outputs a jamming signal for interfering with wiretapping of the MST signal.

A passive device shield 2 used to protect a passive chip containing data embedded in a device from remote skimming at a frequency which activates the chip to send the data, the shield 2 being removable to enable authorized reading of the chip data. The shield 2 is adapted to block the frequencies which activate the chip, the shield 2 further having a transmitter 18 which sends a coupling signal at a non-blocked frequency to a receiver 20, at least one of the receiver/and transmitter 18 having means to monitor the distance between the transmitter 18 and receiver 20 and an alert means to indicate when a predetermined distance has been exceeded.