| 摘要 |
A reception unit for receiving a frequency division multi-accessed signal based on not more than n (n is an integer) spread signals derived from spreading a carrier includes a conversion device for converting a received signal into a quantizable intermediate frequency band signal. Also included is a device for converting the intermediate frequency band signal into a digital signal and outputting a digital intermediate frequency band signal, n units of frequency converters respectively corresponded with n spread signals one by one for frequency converting the digital intermediate frequency band signal so that a center frequency of a corresponding spread signal among the n spread signals becomes 0 Hz, and n units of FIR filters respectively corresponding with the n spread signals one by one for passing only a corresponding spread signal among the frequency converted digital intermediate frequency band signals. A selector is provided for selecting and outputting signals outputted from the n units of FIR filters, a controller is provided for controlling frequency conversion conducted by the n units of frequency converters and filtering conducted by the n units of FIR filters, and a device is provided for inverse-spreading an output signal of the selector. |
