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Table 2 Typical Doppler spreads and coherence times for WiMAX.

From: Uplink User Signal Separation for OFDMA-Based Cognitive Radios

Carrier Freq Speed Max. doppler Coherence time
2.5 GHz 2 km/h 4.6 Hz 200 ms
2.5 GHz 45 km/h 104.2 Hz 10 ms
2.5 GHz 100 km/h 231.5 Hz 4 ms
5.8 GHz 2 km/h 10.7 Hz 93 ms
5.8 GHz 45 km/h 241.7 Hz 4 ms
5.8 GHz 100 km/h 537 Hz 2 ms