| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to divide channels without multiplying a PNS by providing the system with a transmitter for modulating a digital signal by an orthogonal code hopping multiple access mode and transmitting the modulated signal and a receiver for receiving the digital signal by the orthogonal code hopping multiple access mode and restoring the received signal. SOLUTION: A skip orthogonal code generation part 30 for generating an orthogonal code in accordance with a hopping pattern is provided with a hopping control part 31 for controlling the skip pattern of an orthogonal code and an OCG 32 for generating an orthogonal code under the control of the control part 31. Mixers 11a to 11c respectively mix digital signals D0 to Dm with orthogonal codes OC (Ho) to OC (Hm) and an adder 12 mutually adds digital output signals from the mixers 11a to 11c. A PNSG 13 generates a PNS and a mixer 14 multiplies an output signal, from the adder 12 by the PNS. A modulation part 15 modulates a multiplied signal from the mixer 14 to an RF signal. A power amplification part 16 amplifies the RF signal and the amplified signal is outputted from an antenna 17. An RF amplification part 21 amplifies the RF signal received by an antenna 20 and a demodulation part 22 demodulates the amplified signal. |
