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ATPL230A 数据表(PDF) 46 Page - ATMEL Corporation |
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ATPL230A 数据表(HTML) 46 Page - ATMEL Corporation |
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46 / 122 page  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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