Abstract: A method to determine a jitter attack on authorization system granting permission using a resource comprising: receiving at least three subcarrier signals from an authentication device, determining a relative phase deviation from an expected relative phase behavior for the at least three subcarrier signals, and concluding on a jitter attack if the relative phase deviation fulfills a predetermined criterion.

Abstract: A method (100) to determine a present position (122) of an object (600). The method (100) comprises using (102) an optical positioning system (104) to determine a first preliminary position (112) and using (106) a radio-based positioning system (108) to determine a second preliminary position (114), determining (110) a supposed position (116) on the basis of one of the preliminary positions (112, 114) and combining (108) the supposed position (116) with a previous position (212) of the object to determine the present position (122) of the object, if the supposed position (116) is based on a different positioning system (104, 108) than a previous supposed position (116?). A positioning system (500) with combined optical and a radio-based determination of a position of a tracker (600) and a tracker (600) with an active light source (608).

Abstract: A method to determine a relay attack on an authorization system granting permission on using a resource, includes receiving a signal from an authentication device; determining, whether at least two copies of an authentication signal are included in the signal; and concluding on a relay attack if at least two copies of the authentication signal are identified in the signal.

Abstract: The invention concerns a method and a receiver configured to receive a radio signal carrying information, the radio signal including an overall frequency band having at least three different sub carriers. The receiver is further configured to receive, during a first time period, a first multitone signal carrying a first portion of the radio signal, the first multitone signal including a first and a second sub carrier which are received simultaneously, and to determine a first phase difference between the first and the second sub carrier. The receiver is further configured to receive, during a second time period, a second multitone signal carrying a second portion of the radio signal, the second multitone signal including the second and a third sub carrier which are received simultaneously, and to determine a second phase difference between the second and the third sub carrier.

Abstract: A method to determine a relay attack on an authorization system granting permission on using a resource, includes receiving a signal from an authentication device; determining, whether at least two copies of an authentication signal are included in the signal; and concluding on a relay attack if at least two copies of the authentication signal are identified in the signal.

Abstract: A method to determine a jitter attack on authorization system granting permission using a resource comprising: receiving at least three subcarrier signals from an authentication device, determining a relative phase deviation from an expected relative phase behavior for the at least three subcarrier signals, and concluding on a jitter attack if the relative phase deviation fulfills a predetermined criterion.

Abstract: Embodiments provide a data receiver with a unit for receiving sub-data packets configured to receive at least two sub-data packets from a data transmitter, and to combine the at least two sub-data packets to obtain a data packet that is transmitted split into the at least two sub-data packets by the data transmitter, wherein each of the at least two sub-data packets is shorter than the data packet, a unit for receiving sub-data packets configured to receive the at least two sub-data packets on at least two different carrier frequencies a unit for determining a phase difference configured to determine a phase difference between the at least two sub-data packets that is caused by the at least two different carrier frequencies and the path delay, and a unit for determining a distance difference configured to determine a distance difference between the data receiver and the data transmitter based on the determined phase difference between the at least two sub-data packets.

Abstract: A transmit arrangement (100) for generating a signal pattern suitable for a localization comprises a first antenna (102) and at least one second antenna (104) spatially separated from the first antenna. A transmit apparatus (106) of the transmit arrangement (100) is configured to generate a known signal form and to transmit the known signal form by means of a transmit signal via the first and second antennas (104).

Abstract: A method (100) to determine a present position (122) of an object (600). The method (100) comprises using (102) an optical positioning system (104) to determine a first preliminary position (112) and using (106) a radio-based positioning system (108) to determine a second preliminary position (114), determining (110) a supposed position (116) on the basis of one of the preliminary positions (112, 114) and combining (108) the supposed position (116) with a previous position (212) of the object to determine the present position (122) of the object, if the supposed position (116) is based on a different positioning system (104, 108) than a previous supposed position (116?). A positioning system (500) with combined optical and a radio-based determination of a position of a tracker (600) and a tracker (600) with an active light source (608).

Abstract: The invention concerns a method and a receiver configured to receive a radio signal carrying information, the radio signal including an overall frequency band having at least three different sub carriers. The receiver is further configured to receive, during a first time period, a first multitone signal carrying a first portion of the radio signal, the first multitone signal including a first and a second sub carrier which are received simultaneously, and to determine a first phase difference between the first and the second sub carrier. The receiver is further configured to receive, during a second time period, a second multitone signal carrying a second portion of the radio signal, the second multitone signal including the second and a third sub carrier which are received simultaneously, and to determine a second phase difference between the second and the third sub carrier.

Abstract: Embodiments provide a data receiver with a unit for receiving sub-data packets, a unit for determining a phase difference and a unit for determining a distance difference. The unit for receiving sub-data packets is configured to receive at least two sub-data packets from a data transmitter, and to combine the at least two sub-data packets to obtain a data packet that is transmitted split into the at least two sub-data packets by the data transmitter, wherein each of the at least two sub-data packets is shorter than the data packet, wherein the unit for receiving sub-data packets is configured to receive the at least two sub-data packets on at least two different carrier frequencies. The unit for determining a phase difference is configured to determine a phase difference between the at least two sub-data packets that is caused by the at least two different carrier frequencies and the path delay.

Abstract: A transmit arrangement (100) for generating a signal pattern suitable for a localization comprises a first antenna (102) and at least one second antenna (104) spatially separated from the first antenna. A transmit apparatus (106) of the transmit arrangement (100) is configured to generate a known signal form and to transmit the known signal form by means of a transmit signal via the first and second antennas (104).