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Formulas taken from AN1200.13 (LoRa Modem Designers Guide)
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http://www.semtech.com/images/datasheet/LoraDesignGuide_STD.pdf
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No warranty of correctness!
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Input
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Payload size13 bytes
Total payload, including (at least) 13 bytes of LoRaWAN header if used
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Spread factorSF9
SF12-SF6. Higher means more range and better reception, and more airtime
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Explicit headeryes
no header (1) or with header (0). This is the low-level header that indicates coding rate, payload length and payload CRC presence and can be left out if both sides have these parameters fixed
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Low DR optimizeno
disabled (0) or enabled (1), intended to correct for clock drift at SF11 and SF12
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Coding rate4 / 5
4/5 - 4/8. This is the error correction coding. Higher values mean more overhead.
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Preamble symbols8
8 for all regions defined in LoRaWAN 1.0, can be different using plain LoRa
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Bandwidth125kHz
Typically 125, sometimes 250 or 500
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Output
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Tsym4.096ms
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Tpreamble50.176ms
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payloadSymbNb28
number of symbols
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Tpayload114.688ms
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Tpacket164.864ms
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Duty cycle
Time between packet subsequent starts
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0.10%164.864s
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1%16.4864s
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10%1.64864s
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