Abstract: A method of operating a plurality of Radio Frequency Identification (RFID) readers includes operating the readers according to a spatial-division and time-division synchronization schedule. Each reader may be associated with a reader group, and the schedule may specify a duration of time that all of the readers in a group may be active. Readers in different reader groups may be scheduled independent of readers in other reader groups.

Abstract: An RFID reader analog front end architecture employs multiplexed use of a single analog to digital converter in order to digitize the inphase and quadrature components of the incoming signal from the reader's receiving antenna. The Type 1 architecture includes an analog I/Q switch that controls which of the baseband signals will be digitized by a single Analog to Digital Converter. In the Type 2 architecture, the I/Q switch is moved so that it is directly adjacent to the receive mixers, requiring only one antialiasing filter block and gain block. In the Type 3 architecture, one mixer and its associated filtering chain are eliminated. The Type 4 architecture provides for selection of transmitter phase basis by means of an I/Q switch operating under control of the DSP that phase-shifts the transmitter with respect to the receiver.

Abstract: A system and method may employ, focused grammars to facilitate automated generation of computer programs. Such implementation of focused grammars enables a new form of symbolic regression referred to as generative programming or automated programming. The search through the space of possible programs may be guided by a streak search method in accordance with which identified candidate programs that improve on the current streak may be used to create focused grammars for directing an additional localized search. In some embodiments, candidate programs are generated by randomly traversing focused grammars from the starting rule, and subsequently through the grammars, until a complete candidate program parse tree has been constructed. Candidate programs may then be executed, for example, by an evaluator, which may employ an interpreter adapted for use in conjunction with a Stack Manipulation Language or other interpreted language.

Abstract: A data carrier (100) is described for use with a reader for the secure transmission of information. The data carrier (100) comprises an identification number associated with the data carrier (100) and a memory for storing a one-time pad and data. The one-time pad is uniquely associated with the identification number. The data carrier (100) further comprises an encryption circuit for encrypting the data with the one-time pad, and a controller to prevent reuse of bits in the one-time pad. The reader comprises a generator to generate the one-time pad via one of the following: a look-up table, and a pseudorandom number generator operating on a secret key and the identification number of the data carrier.

Abstract: This invention is drawn to a process for isomerizing a non-equilibrium mixture of xylenes and ethylbenzene using a silicoaluminophosphate molecular sieve which is enriched in framework silicon at the surface, resulting in a greater yield of para-xylene compared to prior-art processes.