| 摘要 |
A spectrum-spread signal is taken out by a mixer 11, a low pass filter 2 and a sample hold circuit 3, codes for one period of spreading codes on a transmitting side of the spectrum-spread signal is multiplied by codes for one period of previously given spreading codes on a receiving side and the summations of the multiplication are output by means of a matched filter in a correlator 4, and a symbolic integration section 6 inversely modulates known symbols of a symbol signal inversely spread at one chip interval using theoretical values, and performs symbolic integration, and in a pseudo correlation removing section 7, pseudo correlation is removed by subtracting the theoretical values of the correlation values in order of magnitude of an amplitude and in a synchronization detecting section 5, timing when the amplitude becomes to be maximum is detected as receiving timing.
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