lora设计指南

【实例简介】
lora设计指南
SEMTECH Overview Principles of LoRa Design S=-174+10 logo BW +NF+SNR R R Modulation Typical SNR Lo Ra sf12 20 dB Lo Ra sf1o 15 dB GMSK 9 dB SEMTECH Time on air[ms] Sensitivity [dBm] 12 528.4 134 10 132.1 129 8 39.2 124 500kH 250 kHz 125 kHz SEMTECH BW Time on air [ms]Sensitivity [dBm] 125 264.2 132 250 132.1 129 500 66 126 Advanced LoRa design parameters Sensitivity as a function of code rate 35.00% 30.00% 25.00% 20.00% CR=4/5 c 15.00% CR=4/6 CR=4/7 10.00% CR=4/8 5.00% 0.00% -127 126 -125 -124 -123 -122 -121 -120 Indicated Input Power (dBm SEMTECH CR Time on air [ms] 123 132.1 4 148.5 VR PA VR PA RFO RFO中 LH TRX RFmm⊥4-Rx RF中 SEMTECH The lora packet format Time on air 25F BW n Preamble Symbols hEader Symbols Header CRC Payload Preamble Payload (explicit mode only) CRO CR=4/8 CR= CodingRate SF= SpreadingFactor preamble +4.25 preamble 8PL-4SF+28+16-20H payloadSymbNb=8+max( cei 4( SF-2DE) )CR+4),0 CR yloadsymbnb Ts preamble SEMTECH LoRa calculator LoRa Modem Calculator Tool Calculator Enegy Profie Calculator Inpute Selected Configuration LoRa Modem Settings Coding rate 汇R+4 RFIL-mm R Low Datarate □ Optimiser On Packet Coniguration Programmed Preamble 6 Iols Calculator Output Total PreamblE Length 0.25 Timing perfe Dance Header Mode □ Expl cit Heade Enabled Equivalent bit ate 1171.8B bps Time on Air1946ms ramble Duration 3.97 RE Setti entre Frequency 865UD RE Pedf Hwange Consumption Transmit Power 17 a dEm Link Budget 148 dB Transit 90 Hardwere Imp plementation F RFIO is Shaed Receiver Sensitivity[ -13dBmCAD/Fx Compatible SX Products 1272, 1276 Max Crystal onset45pm5甲10mhA SF=12, BW=500 kHz, CR=4/5, Header disabled, Preamble =10.25 svms Payload =8 bytes, Transmit Power=17 dBm SEMTECH BE UNDERTAKEN SOLELY AT THE CUSTOMER,'S OWN RISK. Should a customer purchase or use Semtech 【实例截图】
【核心代码】