| 摘要 |
Described herein is a hybrid TDMA/TDD mobile telecommunication system in which scrambling codes and spreading codes are used to reduce the cross-correlations between users simultaneously occupying a time slot. A frame comprising a plurality of data signals (50, 60, 70) is divided into a plurality of time slots (52, 54, 56, 62, 64, 66, 72, 74, 76), each time slot for one data signal comprising the same spreading codes. Each spreading code is selected from a set of spreading codes. Each data signal in each time slot also has a scrambling code associated therewith, each scrambling code being selected from a set of scrambling codes. The scrambling code for each data signal (50, 60, 70) is periodically varied to extend the set of scrambling codes which can effectively be used for satisfactory cross-correlation. |
