Abstract: Embodiments of this application disclose an indoor positioning method, a communication system, and a related device. The method in embodiments of this application includes an indoor terminal device receives first location information of a network device and second location information of a reconfigurable intelligent surface, to obtain a first reference signal, where the first reference signal is obtained by the reconfigurable intelligent surface by reflecting a location reference signal from the network device. The indoor terminal device determines a target location of the terminal device based on the first reference signal, the first location information, and the second location information.

Abstract: In a UWB real time locating system, UWB readers (12) are synchronized by adjusting a clock of a UWB slave reader (12) until the UWB reader (12) receives each UWB pulse (34) of a sequence of UWB pulses (34) having a predetermined pulse period (Tp) and encoding a master UWB reader unique identifier at an expected time slot (35) within each predetermined pulse period (Tp), the expected time slot (35) being related to the distance between the UWB tag reader (12) and a master UWB reader (12).

Abstract: The present invention relates to a method and a system for determining the position of an object which can be a passive or an active tag (140). The system comprises a plurality of anchor nodes (111,112) and a plurality of non-regenerative relays (121,122,123) of known positions. In case of an active tag, a UWB pulse signal is emitted by the tag and received by the anchor nodes either directly or via a relay. In case of a passive tag, UWB pulse signals are sent by the anchors nodes and reflected back, either way being either a LOS path or a relayed path. A processing node (130) collects the signals received by the anchor nodes (111,112) to estimate the position of the tag.

Abstract: In a UWB real time locating system, UWB readers (12) are synchronized by adjusting a clock of a UWB slave reader (12) until the UWB reader (12) receives each UWB pulse (34) of a sequence of UWB pulses (34) having a predetermined pulse period (Tp) and encoding a master UWB reader unique identifier at an expected time slot (35) within each predetermined pulse period (Tp), the expected time slot (35) being related to the distance between the UWB tag reader (12) and a master UWB reader (12).

Abstract: A method for communication in ultra-wide bandwidth RFID systems comprising generating through a transceiver device an interrogated signal, composed of at least a sequence of equally time spaced pulses with period (T3), transmitting said signal to at least one RFID identification device which generates a response signal and transmits it back to said transceiver device, said method further comprising coding said interrogation signal according to a numerical coding sequence, generating said response signal by varying, in each period (T3) of said pulse sequence of the interrogation signal, the polarity of pulses using said numerical coding sequence. An apparatus for communication in ultra-wide bandwidth RFID systems comprising a transceiver device (1,101) and a RFID identification device (11), suitable for communicating each other, said RFID identification device (11) comprises a backscatter modulator (12) suitable for modulating a signal reflected by an antenna (18) of the identification device RFID.

Abstract: A method for communication in ultra-wide bandwidth RFID systems includes the steps of generating through a transceiver device an interrogation signal composed of at least a sequence of equally time spaced pulses within a period and transmitting the signal to at least one RFID identification device which generates a response signal and transmits it back to the transceiver device. The interrogation signal is coded according to a numerical coding sequence. The response signal is generated by varying, in each period of the pulse sequence of the interrogation signal, a polarity of pulses using the numerical coding sequence. An apparatus for communication in ultra-wide bandwidth RFID systems includes a transceiver device and a RFID identification device, suitable for communicating with each other. The RFID identification device includes a backscatter modulator suitable for modulating a signal reflected by an antenna of an identification device RFID.

Abstract: The present invention relates to an interfacial method of preparing ester-substituted diaryl carbonates. The method includes the steps of: forming a reaction mixture comprising phosgene, an ester-substituted phenol, an organic solvent, and a catalyst selected from the group consisting of a tertiary amine catalyst and a phase transfer catalyst, said reaction mixture having an organic phase and an aqueous phase, wherein said aqueous phase has a brine strength; allowing the reaction mixture to react wherein during the reaction, (i) the aqueous phase has a pH, and the pH is adjusted, if necessary, by the addition of an alkali metal hydroxide solution in amounts such that the pH is greater than or equal to 9.

Abstract: The present invention relates to an interfacial method of preparing ester-substituted diaryl carbonates. The method includes the steps of: forming a reaction mixture comprising phosgene, an ester-substituted phenol, an organic solvent, and a catalyst selected from the group consisting of a tertiary amine catalyst and a phase transfer catalyst, said reaction mixture having an organic phase and an aqueous phase, wherein said aqueous phase has a brine strength; allowing the reaction mixture to react wherein during the reaction, (i) the aqueous phase has a pH, and the pH is adjusted, if necessary, by the addition of an alkali metal hydroxide solution in amounts such that the pH is greater than or equal to 9.

Abstract: The present invention relates to an interfacial method of preparing ester-substituted diaryl carbonates. The method includes the steps of: forming a reaction mixture comprising phosgene, an ester-substituted phenol, an organic solvent, and a catalyst selected from the group consisting of a tertiary amine catalyst and a phase transfer catalyst, said reaction mixture having an organic phase and an aqueous phase, wherein said aqueous phase has a brine strength; allowing the reaction mixture to react wherein during the reaction, (i) the aqueous phase has a pH, and the pH is adjusted, if necessary, by the addition of an alkali metal hydroxide solution in amounts such that the pH is greater than or equal to 9.

Abstract: A method for preparing an aliphatic chloroformate comprising, introducing a mixture of at least one aliphatic hydroxyl compound, phosgene, at least one solvent, and optionally at least one organic base into a flow reactor to obtain a unidirectional flowing reaction mixture. The at least one aliphatic hydroxyl compound comprises at least one aliphatic hydroxyl group. The unidirectional flowing reaction mixture is maintained at a temperature between about 0° C. and about 60° C. to produce a single product stream comprising an aliphatic chloroformate.

Abstract: The present invention relates to an interfacial method of preparing ester-substituted diaryl carbonates. The method includes the steps of: forming a reaction mixture comprising phosgene, an ester-substituted phenol, an organic solvent, and a catalyst selected from the group consisting of a tertiary amine catalyst and a phase transfer catalyst, said reaction mixture having an organic phase and an aqueous phase, wherein said aqueous phase has a brine strength; allowing the reaction mixture to react wherein during the reaction, (i) the aqueous phase has a pH, and the pH is adjusted, if necessary, by the addition of an alkali metal hydroxide solution in amounts such that the pH is greater than or equal to 9.

Abstract: Copolyorganosiloxanecarbonates are prepared by first preparing an oligomeric aromatic polycarbonate, such as an oligomeric bisphenol A polycarbonate, in the presence of a tertiary amine as the only catalyst species; contacting the oligomeric polycarbonate mixture with a polyorganosiloxane bis(aryl)chloroformate, such as the bischloroformate of hydroxy-terminated eugenol polydimethylsiloxane; and introducing phosgene and/or chain termination agent either continuously or in stages. A feature of the process is the presence of dihydroxyaromatic compound in only one charge, at the beginning. The products have excellent physical properties, including transparency.