| 摘要 |
PROBLEM TO BE SOLVED: To efficiently transmit a multi-valued digital signal by a simple circuit in a spread spectrum modulation/demodulation system. SOLUTION: The multi-valued digital signal generated from an information generation part 30 is inputted in a code controller 31. After the code controller 31 generates a deformed spreading code so as to output the differential signal of two kinds of codes (A, B) of the same number of chip by a preliminarily fixed arbitrary period (number of chip) for a 3-bit input signal, for instance, from the information generation part 30 and demodulates this deformed spreading code in a BPSK modulator 32, the controller 31 performs a transmission via a band-pass filter 33, an amplifier 34 and an antenna 35. |
