Abrégé

A method for locating wireless devices within a local region, comprising: determining respective global locations of two or more of the wireless devices; determining whether the wireless devices are within the local region by calculating respective distances between the global locations; determining respective ranges between the wireless devices within the local region; and, determining respective relative locations of the wireless devices within the local region by triangulation using the ranges.

Classes IPC  ?

• G01S 5/10 - Position du récepteur obtenue par coordination de plusieurs lignes de position définies par des mesures de différence de parcours
• H04W 64/00 - Localisation d'utilisateurs ou de terminaux pour la gestion du réseau, p. ex. gestion de la mobilité

Abrégé

A method for identifying and ranging a wireless device, comprising: transmitting an original radar signal from a detecting system; in response to the original radar signal, receiving a modulated radar signal at the detecting system, the modulated radar signal being backscattered from an antenna of the wireless device and containing information pertaining to the wireless device, and the modulated radar signal being a frequency offset version of the original radar signal; and, using a processor at the detecting system, determining an identity and a range of the wireless device from the modulated radar signal.

Classes IPC  ?

• G01S 13/74 - Systèmes utilisant la reradiation d'ondes radio, p. ex. du type radar secondaireSystèmes analogues
• H04W 64/00 - Localisation d'utilisateurs ou de terminaux pour la gestion du réseau, p. ex. gestion de la mobilité

Abrégé

A transmission apparatus for a wireless device, comprising: an antenna for receiving an original signal and for backscattering a modulated signal containing information from the wireless device; a variable impedance coupled to the antenna, the variable impedance having an impedance value; and, a decoder coupled to the variable impedance for modulating the impedance value, and thereby a backscattering coefficient for the antenna, in accordance with the information to generate the modulated signal.

Classes IPC  ?

• H04B 7/22 - Systèmes de propagation par diffusion
• G01S 13/75 - Systèmes utilisant la reradiation d'ondes radio, p. ex. du type radar secondaireSystèmes analogues utilisant des transpondeurs alimentés par les ondes reçues, p. ex. utilisant des transpondeurs passifs
• H02J 17/00 - Systèmes pour l'alimentation ou la distribution d'énergie par ondes électromagnétiques
• H04B 1/59 - RépondeursTranspondeurs
• H04L 27/00 - Systèmes à porteuse modulée

Abrégé

An inductive coupling apparatus for modifying an incoming radio frequency (RF) signal includes an inductive element. A variable impedance circuit includes an output electrically coupled to the inductive element. A band-pass delta sigma modulator is coupled to the variable impedance circuit and digitally controls the output of the variable impedance circuit. The incoming RF signal is modified as the coupled impedance of the inductive element is adjusted in accordance with the output of the variable impedance circuit.

Classes IPC  ?

• H04B 1/59 - RépondeursTranspondeurs
• G06K 7/08 - Méthodes ou dispositions pour la lecture de supports d'enregistrement avec des moyens de perception des modifications d'un champ électrostatique ou magnétique, p. ex. par perception des modifications de la capacité entre des électrodes
• H01F 38/14 - Couplages inductifs
• H03M 7/32 - Conversion en, ou à partir d'une modulation delta, c.-à-d. une modulation différentielle à un bit
• H04B 5/00 - Systèmes de transmission en champ proche, p. ex. systèmes à transmission capacitive ou inductive
• H04B 7/005 - Commande de la transmissionÉgalisation

Abrégé

An inductive coupling apparatus for modifying an incoming radio frequency (RF) signal includes an inductive element for modifying the incoming RF signal in accordance with a coupled impedance characteristic of the inductive element. A variable impedance circuit includes an output electrically coupled to the inductive element. A low pass delta sigma modulator is coupled to the variable impedance circuit and digitally controls the output of the variable impedance circuit, the coupled impedance of the inductive element being adjusted based on the output of the variable impedance circuit.

Classes IPC  ?

• H04B 1/59 - RépondeursTranspondeurs
• H01F 38/14 - Couplages inductifs
• H03M 7/32 - Conversion en, ou à partir d'une modulation delta, c.-à-d. une modulation différentielle à un bit
• H04B 5/00 - Systèmes de transmission en champ proche, p. ex. systèmes à transmission capacitive ou inductive
• H04B 7/005 - Commande de la transmissionÉgalisation
• H04L 27/00 - Systèmes à porteuse modulée

Abrégé

A communication apparatus comprising an antenna for backscattering an incoming RF signal in accordance with a reflection coeflicient of the antenna. The communication apparatus comprises at least one band-pass delta sigma modulator which modulates the signal at its input and digitally controls the output of a variable impedance circuit, wherein the reflection coefficient of the antenna is varied based on the output of the variable impedance circuit. This communication device can be used in applications such as RFTD tags.

Classes IPC  ?

• H04B 1/59 - RépondeursTranspondeurs
• H03M 7/32 - Conversion en, ou à partir d'une modulation delta, c.-à-d. une modulation différentielle à un bit
• H04B 7/005 - Commande de la transmissionÉgalisation
• H04L 27/34 - Systèmes à courant porteur à modulation de phase et d'amplitude, p. ex. en quadrature d'amplitude

Abrégé

A communication apparatus comprising an antenna for backscattering an incoming RF signal in accordance with a reflection coefficient of the antenna. The communication apparatus comprises at least one low pass delta sigma modulator which modulates the signal at its input and digitally controls the output of a variable impedance circuit, wherein the reflection coefficient of the antenna is varied based on the output of the variable impedance circuit. This communication device can be used in applications such as RFID tags.

Classes IPC  ?

• H04B 1/59 - RépondeursTranspondeurs
• H03M 7/32 - Conversion en, ou à partir d'une modulation delta, c.-à-d. une modulation différentielle à un bit
• H04B 7/005 - Commande de la transmissionÉgalisation
• H04L 27/34 - Systèmes à courant porteur à modulation de phase et d'amplitude, p. ex. en quadrature d'amplitude