| 摘要 |
PROBLEM TO BE SOLVED: To enhance C/N using a narrow band transmission with strong frequency selectivity phasing, and to use idle frequencies effectively. SOLUTION: In a modulator 12 of a transmitter, after transmission data 11 is split into a plurality of data, they are modulated by the use of carriers of different frequencies, respectively; and after they have been band-restricted through each independent filter, they are transmitted as multicarriers. In a receiver, a plurality of carriers from a BPF 20 are input into a detector 21, and the detector 21 fetches out each of the plurality of multicarriers through a plurality of narrow-band filters provided in correspondence to each carrier; and after a demodulator 22 demodulates each carrier, they are combined. The filter in the transmitter and the filter in the receiver are both provided independently in each carrier, and the band restriction of each transmission system can be changed adaptively. |
