DTTB Systems Doppler Performance Limits

VHF - Band III

UHF

DOPPLERSHIFT(?Hz)

140

300

0

0

1000

500

100

200

300

400

600

700

800

900

100

50

200

250

COFDM 2K, 3dB degrade

COFDM 2K

SPEED (Km/Hr)

AIRCRAFT

Vehicles

Over Cities

for current implementations

ATSC

see separate curves

COFDM implementations will inherently handle post and pre-ghosts equally within the selected guard interval.

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