| 摘要 |
<p>In a code division multiple access (CDMA) communications system, a PN sequence generating device (310) is provided to generate a PN sequence by interleaving (322, 332, 342) of cyclically shifting the symbols of an orthogonal or biorthogonal code (320, 330, 340) in accordance with a pre-defined hopping pattern (360). A receiver receives simultaneous signals from a plurality of transmitters, where each transmitted signal is spread by a PN sequence generated from the same pre-defined hopping pattern. The receiver is able to differentiate the received signals from each transmitter by varying the amount of interleaving or cyclic shift in each transmitted signal. In the PN sequence generating device (310), an orthogonal symbol generating portion (320, 330, 340) cyclically shifts mutually orthogonal and periodic orthogonal code sequences, and an orthogonal symbol selector (350) selectively outputs the cyclically shifted orthogonal symbols according to a predetermined pattern.</p> |
