Doppler Shift

Frequency offset caused by relative motion

Real-World Applications

High-speed rail 5G communications, LEO satellite communications (Starlink), police speed radar, medical ultrasound imaging. A 350km/h train can produce up to 600Hz (2GHz band) frequency offset, requiring complex frequency offset correction at base stations.

Experiment Steps

1. Frequency Offset: fd = fc·v·cos(θ)/c
2. High Speed: 350km/h@2GHz, fd≈650Hz

Simulation Experiment

Functions: models.channel.maxDopplerShift(), models.channel.coherenceTime()