| 摘要 |
PROBLEM TO BE SOLVED: To reduce the circuit scale and to shorten a code phase detection time that is needed for initial synchronization. SOLUTION: A combined code generation part 22 of a correlator weights plural reference spread codes A1 to AM, having phases which are shifted with respect to each other and combines them to output a combined spread code with respect to a spread spectrum signal. An arithmetic circuit 23, at the same time calculates correlations between a receiving spread code and the codes A1 to AM. Then a phase detection circuit 24 detects the phase difference between the receiving spread code and the reference spread code, i.e., the phase of the receiving spread code. |
