| 摘要 |
PROBLEM TO BE SOLVED: To reduce erroneous synchronization by outputting a signal obtained by adding a matched filter output signal at the present time with matched filter output signals, before and after that point as an inversion diffusion signal. SOLUTION: A received signal 9 is orthogonal detected by an orthogonal detector 2, and a base band I signal 10 and a base band Q signal 11 are obtained. Those base band I and Q signals 10 and 11 are respectively band limited by route Nyquist filters 3 and 4. Band limited base-band I and Q signals 12 and 13 are respectively converted into digital signals by A/D converters 5 and 6, and digital I and Q signals 14 and 15 are obtained. Those signals 14 and 15 are inversion diffused by matched filters 7 and 8. Then, signals 16, 24, and 25 are added by an adder 22, and an inversion diffusion output I signal 28 is obtained. In the same way, signals 17, 26, and 27 are added by an adder 23, and an inversion diffusion output Q signal 29 is obtained. |
