| 摘要 |
PROBLEM TO BE SOLVED: To reduce S/N deterioration owing to the transmission path of wide band transmission wave by setting a transmission signal which is outputted from a transmission side to a valve for negating its spectrum amplifying quantity and the previously grasped, etc., transmission path. SOLUTION: Transmission information S1 is spread in a balanced modulator 11 by a spread code from a spread code generator 13 so as to be the transmission signal S2. The signal S2 is spectrally amplified by a spectrum amplifier 15. The spectrum reinforcing quantity is set to a value for negative apreviously grasped or estimated transmission path characteristic. The transmission signal S7 of the output is reinforced and transmitted from an antenna A1. The transmission signal S7 from a transmitter is received by the antenna A2 at a reception side. Reception wave is executed high frequency amplifying 21 and spectrally corrected 26 as the signal S8 and the signal 9 is outputted. The signal 9 is corrected, spectrum deterioration is reduced, reverse spread is executed by the spread signal from the spread code generator 24 being the same as that of the transmission side in the balanced modulator 22, base band demodulation is executed and transmission information S11 is outputted. |
