RP002-1.0.0 LoRaWAN Regional Parameters
©2019 LoRa Alliance ® Page 84 of 88
The authors reserve the right to change
specifications without notice.
1699
Size (bytes) 5 3 1 L bytes from
PHYPayloadLength
2
Packet Structure Preamble SyncWord PHYPayloadLength PHYPayload CRC
Figure 4: FSK PHY structure 1700
1701
3.2.2 FSK settings 1702
In order to be fully compliant with LoRaWAN, an end device SHALL configure the FSK 1703
physical layer as follows: 1704
1705
Parameter Uplink value Downlink value
Preamble size 5 bytes
SyncWord 0xC194C1
Bitrate 50000 bit/sec
Tx frequency deviation 25kHz (SSB
1
)
Rx bandwidth 50kHz (SSB)
Rx bandwidth AFC 80kHz (SSB)
CRC presence True (CRC-CCITT)
Gaussian filter BT = 1,0
DC Free Encoding Whitening Encoding
Table 96 : FSK physical layer settings 1706
1707
To avoid a non-uniform power distribution signal with the FSK modulation, a Data Whitening 1708
DC-Free data mechanism is used as shown in the above table. 1709
1710
1711
1
SSB : Single Side Bandwidth
