WiMAX, WiBro Measurements (Options K92/K93) R&S FSL
1300.2519.12 2.150 E-11
Subchannelization
Subchannelization can be used in uplink bursts to allocate only a subset of the available OFDM sub
carriers. The measurement software can distinguish between downlink bursts, uplink bursts without
subchannelization and uplink bursts with a selectable subchannel index. Thus it is possible to analyze
the complete WirelessMAN traffic with one capture buffer shot.
Synchronization
The synchronization of uplink bursts using subchannelization is performed after the synchronization on
standard downlink and uplink preambles:
1. Synchronization of downlink and uplink bursts without subchannelization.
2. Pre–analysis of the bursts without subchannelization to determine their length.
3. Extraction of TX power areas without already detected bursts.
4. Synchronization of uplink bursts with the selected subchannel index.
In the following sections, the influence of subchannelization on results is discussed.
Channel Results
The standard requires an interpolation of order 0 for the channel estimation on unallocated sub carriers,
i.e. the estimated channel coefficient of the nearest allocated sub carrier shall be used for those sub
carriers not part of the allocated subchannels.
For the derived channel results like group delay or flatness difference, the unallocated carriers are not
taken into account.
Fig. 2-91 Spectrum Flatness
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