| 摘要 |
PURPOSE:To prevent a bit error rate from being deteriorated, by eliminating the distortion of a transmission line by an automatic equalizer, and eliminating the random fluctuation of a transmission symbol position added on a transmission side by a random number group generation circuit. CONSTITUTION:The position of a transmission symbol from a transmission symbol generator 1 fluctuates at random by the random number group generation circuit 2 and an adder circuit 3, then, it is inputted to a modulation circuit 4. A transmission signal, after receiving the distortion on the transmission line 5, is demodulated at a demodulation circuit 6. The distortion on the transmission line 5 is eliminated at the automatic equalizer 7. Since an authorized receiver can generate one and the same identical random number as that of the transmission side by the random number group generation circuit 8, it is possible to eliminate the fluctuation of the symbol position added on the transmission side by using a subtractor 9. A decision circuit 10 decides the output of the subtraction circuit 9. |
