General Description
R&S
®
CMW-KM750/-KM751
18
User Manual 1173.9670.02 ─ 05
TS0 is always allocated to the downlink, TS1 to the uplink. Timeslots 2 to 6 are divided
between the two directions, separated by the switching point. By moving the switching
point the ratio between uplink and downlink data rates can be adapted to increase the
spectrum efficiency.
The downlink pilot timeslot (DwPTS) contains a 32 chip guard period and a 64 chip SYNC
code. This code allows the user equipment (UE) to synchronize to the downlink signal
and defines the value range for the scrambling code and the basic midamble code.
Fig. 3-4: Downlink pilot timeslot structure
The uplink pilot timeslot (UpPTS) contains a 128 chip SYNC code and a 32 chip guard
period.
Fig. 3-5: Uplink pilot timeslot structure
A traffic timeslot contains two data fields, a midamble and a guard period.
The midamble is a training sequence allowing to perform traffic estimation. It is neither
spread nor scrambled. The midamble is obtained from a basic midamble by periodic
repetition and shifting. The basic midamble is a cell-specific bit pattern correlated to a
certain scrambling code.
TD-SCDMA Signal Properties
