| 摘要 |
<p>PROBLEM TO BE SOLVED: To demodulate a desired wave satisfactorily even if multipath fading changes rapidly by providing an inverse diffusion circuit which demodulates a receiving signal through diffusion codes that are shifted by only mutually different time of each finger receiving circuit and a selector which selects an output having good receiving quality. SOLUTION: A diffusion code outputted from a diffusion code generator 3 is delayed only by its delay time by delay circuits 21 to 28 based on a signal representing the delay time of each multipath component that is outputted by a DSP 2 and is inputted to a finger receiving circuit 11. Inverse diffusers 100 to 104 demodulate a receiving signal with diffusion codes which are mutually different by only time T. That is, the respective diffusers 100 to 104 demodulate the receiving signal with diffusion codes which are inputted to the circuit 11 and whose time, i.e., timings are shifted by only -2T, -T, 0, T, and 2T. Here, finger receiving circuits 11 to 18 perform the same operation. A selector 105 selects the signal having the best receiving quality among outputs of the diffusers 100 to 104.</p> |
