| 摘要 |
<p>A FDMA/TDMA or TDCDMA modulated signal is received through an antenna (10, FIG. 1) and down converted through a down converter (20). The signal is converted to a digital format and through an analog to digital converter (30). The digital representation of the modulated signal is filtered and decimated by way of a polyphase filter (40). The decimated representations of TDCDMA modulated signals from the polyphase filter (40) are correlated with the appropriate pseudonoise code, while decimated FDMA/TDMA modulated signals are correlated frequency information corresponding to the center of the appropriate FDMA/TDMA channel. For transmission of FDMA/TDMA or TDCDMA baseband information signals, the signals are output from a communications processor (FIG. 2, 190), input to a transform (150) and interpolated using an inverse polyphase filter (140). The resulting modulated baseband information signals are input to a digital to analog converter (130), upconverted through up converter (120) , and transmitted.</p> |
