Patent ID: 8000375
Filing Date: 2011-08-16
Classification: H04B

Abstract:
1. 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 the frequency hopping pattern code 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 at pseudo random; 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 a modulated signal from the responder received by the antenna by the unmodulated signal output by the frequency oscillation means.