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 |