| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio communication system and a radio communication apparatus which are capable of making it difficult for a person trying unauthorized wiretapping to receive radio signals, increasing the number of changeable parameters, and has high confidentiality and high anti-interference property. <P>SOLUTION: A multi-carrier transmission system has a transmitting station provided with a serial-parallel converting means for converting data into M pieces of data (M being an integer of two or more) and a multi-carrier modulating means for modulating each of the M pieces of data, and a receiving station provided with a multi-carrier demodulating means for demodulating each of modulation signals of an M system and a parallel-serial converting means for converting M pieces of demodulated data into one data. In this system, the transmitting and receiving stations are each constituted so as to be provided with a control means for varying during communication at least any of the value of M, the frequency of each modulation signal of M system, the bandwidth of each modulation signal of the M system and the modulation system of each modulation signal of the M system. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
