L64724 LSI Logic Corporation, L64724 Datasheet - Page 163

• Manufacturer Part Number: L64724
• Description: Satellite Receiver
• Manufacturer: LSI Logic Corporation

Figure 6.8
Figure 6.9
You must select a value for the ratio VMBEC/VMDC1 that is between the
in-synchronization and the out-of-synchronization curves. For example,
for a rate equal to 1/2 code, a value of 0.24 for VMBEC/VMDC1
establishes a valid decision threshold over the entire E
Viterbi Decoder Synchronization
Channel Symbol Error Rate vs. SNR for Rate = 6/7 Code
Channel Symbol Error Rate vs. SNR for Rate = 7/8 Code
SNR = E
SNR = E
s
/sigma^2 [dB]
s
/sigma^2 [dB]
b
/N
o
range shown.
6-7