Interrogator
AssigneeToshiba Tec Kabushiki Kaisha
InventorsNobuo Murofushi, Masakazu Kato
Life of this patent
Estimating the term…
Abstract
A hopping pattern setting section sets, as a frequency hopping pattern code, elements of a matrix in which all integers of “1” to “the number of frequencies to be used” appear only once and which is obtained by adding, as an offset, any one of integers of “0” to “(the number of frequencies to be used)−1” to each of elements of a matrix obtained by excluding integers larger than the number of frequencies to be used from a matrix in which all integers of “1” to “(prime number larger than the number of frequencies to be used)−1” appear only once. A frequency oscillation section converts the frequency hopping pattern code into the frequencies to be used to output unmodulated signals of the frequencies to a transmission section and a reception section.
Claims20
An interrogator which performs radio communication with a responder by a frequency hopping scheme, comprising:
- hopping pattern setting means for setting, as a frequency hopping pattern code, elements of a matrix in which all integers of “1” to “the number of frequencies to be used” appear only once and for obtaining by adding, as an offset, any one of integers of “0” to “(the number of frequencies to be used)−1” to each of elements of a matrix obtained by excluding integers larger than the number of frequencies to be used from a matrix in which all integers of “1” to “(prime number larger than the number of frequencies to be used)−1” or “1” to “(positive integer power of a prime number larger than the number of frequencies to be used)−1” appear only once;
- frequency oscillation means for converting the frequency hopping pattern code set by the hopping pattern setting means into the frequencies to be used to output unmodulated signals of the frequencies;
- transmission means for modulating the unmodulated signal output by the frequency oscillation means by transmission data to output a modulated signal to an antenna;
- and
- reception means for demodulating the modulated signal received by the antenna by the unmodulated signal output by the frequency oscillation means.
A interrogator which performs radio communication with a responder by a frequency hopping scheme, comprising:
- a sender which is configured to modulate an unmodulated signal by transmission data to output a modulated signal to an antenna;
- a receiver which is configured to demodulate the modulated signal received by the antenna by the unmodulated signal;
- a hopping pattern setting section having a hopping pattern table which is configured to set, as a frequency hopping pattern code, elements of a matrix in which all integers of “1” to “the number of frequencies to be used” appear only once and which is obtained by adding, as an offset, any one of integers of “0” to “(the number of frequencies to be used)−1” to each of elements of a matrix obtained by excluding integers larger than the number of frequencies to be used from a matrix in which all integers of “1” to “(prime number larger than the number of frequencies to be used)−1” or “1” to “(positive integer power of a prime number larger than the number of frequencies to be used)−1” appear only once;
- and
- a frequency oscillator which is configured to convert the frequency hopping pattern code set by the hopping pattern setting section into the frequencies to be used to output unmodulated signals of the frequencies to the sender and the receiver.
Dependencies are inferred from the claim text.