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ATPL230A Datasheet(PDF) 46 Page - ATMEL Corporation

Part # ATPL230A
Description  ATPL Series Power Line Communications Device
PDF  122 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATPL230A Datasheet(HTML) 46 Page - ATMEL Corporation

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ATPL230A [DATASHEET]
Atmel-43053J-ATPL230A-Datasheet_22-Sep-16
46
arithmetic average of the accumulated errors in each one of the four replicated symbols. The value is cleared by
hardware each time a new message is received in BUF_RX3.
* Viterbi Soft Decision: in “soft” decision there are sixteen decision levels. Once decodified, a strong ‘0’ is represented
by a value of “0”, while a strong ‘1’ is represented by a value of “15”. The rest of values are intermediate, so “7” is used
to represent a weak ‘0’ and “8” represents a weak ‘1’. Soft decision calculates the error in one bit received as the
distance in decision levels between the value received (a value in the range 0 to 15) and the corrected one (0 or 15).
Figure 8-2.
Example of Viterbi Soft detection decision levels in a BPSK constellation
`1´
`0´
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
ro
ng
er
`1´
Stro
ng
e
Decision
Thresholds
Symbol
Threshold
Weak `0´
Weak `1´
Φ1
Φ0
Φex
Example:
Received value = 0
Decodified value = Φex
Error accumulated = +3



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