| 摘要 |
PROBLEM TO BE SOLVED: To improve receiving quality by obtaining mutual correlation between a received signal and an already known signal group from the frequency band width of a transmission and reception signal by the irreducibly lowest sampling frequency and interpolating its mutually correlated values by an interpolation filter to always receive with an optimum receiving timing. SOLUTION: A group correlation device 102 calculates the mutually correlated value in an n-th slot. The interpolation filter 103 interpolates the correlated values of two samples per one chip outputted from the device 102 so as to calculate the correlated value of highest delaying precision. After a power calculating part 104 obtains the power (the square sum of an I component and a Q component) of a correlated value to remove phase components, an averaging part 105 executes inter-slot averaging with respect to the mutually related values of a delay time. It is desirable to suppress the number of these averaging slots to irreducibly lowest. A peak detection circuit 106 obtains a delay time maximizing averaged mutually correlated power. |
