User`s guide

User’s Guide 5
E4438C Option H13 Signal Studio for WiMAX
About WiMAX
The TTG (transmit/receive transition gap) and RTG (receive/transmit transition gap) are
inserted at the end of each subframe and the end of each frame to allow the base station to
change from transmit to receive mode.
For frequency division duplex (FDD) mode, the downlink and uplink signals are
transmitted simultaneously at different frequencies. Downlink and uplink frames are
transmitted continuously in time and the structures of the downlink frames and uplink
frames are basically the same as described for the corresponding TDD subframes.
Please refer to the IEEE 802.16-2004 standard for more details about the frame structure
and parameters.
Figure 1 Frame Structure for TDD Signal