SPECTRUM DIFFUSION RECEIVER

摘要

PURPOSE:To decrease a transmission error by inputting a PN code signal inputted to a correlating circuit and a sample circuit through a filter to have the transmission characteristic of a transmission path and the phase characteristic of a transmission signal which is frequency-band-limited. CONSTITUTION:A PN code generating circuit 2 generates a PN code signal p(t) to be composed of an m-system code of 15 bits by using shift registers 11B-11E of four steps. This PN code signal p(t) is inputted to a filter circuit 5. This PN code signal p(t) to be inputted to the filter circuit 5 is inputted to a correlating circuit 3 and a sample circuit 4 as a PN code signal FP(t) after the filter which is phase-direction-corrected by the phase characteristic of the filter circuit 5. Digital correlators 6A-6D obtain a correlating value 13 of a high peak by the PN code signal FP(t) which is phase-corrected by the filter circuit 5 and synchronization establishment is made early. Further, the transmission error due to the step-out synchronization is decreased.