Issue link: https://read.uberflip.com/i/1464683
LoRaWAN ® Fragmented Data Block Transport Specification TS004-2.0.0 ©2022 LoRa Alliance ® Page 25 of 32 The authors reserve the right to change specifications without notice. 658 Figure 1: 26x52 parity check matrix We can see that the parity matrix consists first of an MxM identity matrix followed by a parity 659 control MxM matrix. 660 661 The coded fragment P M N is therefore the bitwise XOR of the uncoded fragment such that 662 ( ) is non-zero. The coded fragments have exactly the same bit length as the uncoded 663 fragments. 664 665 Step-by-step encoding example: 666 The transmitter must send 2,000 octets, allowing up to a 50% packet 667 error rate on the radio link. A coding ratio of ½ is selected. For this 668 example, the 2,000 octets data block will be segmented in 100 669 fragments of 20 octets each, where each frame will transport 1 670 fragment. The transmitter will send 100/CR = 200 coded fragments. 671 We will see that the receiver will be able to decode as soon as it 672