| 摘要 |
PROBLEM TO BE SOLVED: To obtain a spread code with an accurate code string and an accurate phase for inverse spread processing in the receiver. SOLUTION: A synchronizing signal detector 2 reproduces a spread code S2 from a signal S1 subject to spread spectrum processing. A digital correlation device 4 executes collation bit by bit between the reproduced spread code S2 and a reference spread code S3 to calculate a correlation value of the two codes. When an autocorrelation value exceeds a prescribed threshold level, it means that the reproduced spread code S2 is coincident with the reference spread code S3. In this timing, a phase of the reproduced spread code, that is, the phase of the reception signal subject to spread spectrum processing is discriminated. A multiplier 8 receives the reception signal S1 subject to spread spectrum processing and a spread code S5 whose code string is the same as that of the reference spread code S3 outputted from a spread code generator 6 through phase synchronization and applies multiplication to them for each bit to conduct inverse spread spectrum processing so as to provide an output of an information signal S7. |
