DTTB System Dynamic Multipath Character

0

3

15

30

15

19

35

Multipath Level ( - dB)

(Single Echo)

8VSB

COFDM

(64QAM,2/3,1/8)

C/N Threshold (dB)

Indoor Antenna

Outdoor Antenna

W.T.Dickson 29 March 98

(Conditions: Dynamic multipath (flutter), Equal Rx NF, No Co-channel or impulse interference)

8VSB

w/o flutter

with flutter

Dependent upon flutter level (amplitude and doppler shift)

With or without flutter

Picture

No Picture

(above curve)

(Below curve)

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