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tapparelj / gr-lora_sdr

This is the fully-functional GNU Radio software-defined radio (SDR) implementation of a LoRa transceiver with all the necessary receiver components to operate correctly even at very low SNRs. This work has been conducted at the Telecommunication Circuits Laboratory, EPFL.
https://www.epfl.ch/labs/tcl/
GNU General Public License v3.0
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Erroneous Decoding for LDRO Enabled Transmissions #80

Closed PKtheanonymousdeveloper closed 1 week ago

PKtheanonymousdeveloper commented 8 months ago

Hello @tapparelj

I am testing your software decoder for LDRO enabled Transmissions and found out that the output is erroneous and garbled. I have also attached the recorded transmission for your testing to fix LDRO issues.

Transmitted msg in ASCII (hex) at SF 5 with LDRO enabled. "HELLO WORLD"

Msg Received in HEX in LDRO Enabled SX1268 hardware receiver. 48 45 4c 4c 4f 20 57 4f 52 4c 44 // corresponds to HELLO WORLD, that is the transmitted message.

Erroneous output received using feature/sf5_6_sx126x. rx Hex: 2a 85 c9 66 07 88 28 d0 2e 9d 6d d2 f3 e3 81 88 58 1c f5 eb 13 6d 86 9f 80 95 3a de e0 bc b3 0e 75 64 4b 2b 70 8e eb 41 8e fe 2f 92 12 f0 8e 1f 7d d7 e8 25 8d db a6 28 85 44 6b c5 66 9c 8c 3e 74 7b ed 9b cf 36 1d d6 07 e4 4d fa dd 7e 56 4c bd ba f2 4b 6d ce 7c 19 1f 34 da 38 62 1c 7e 95 d6.

Recording has been done using RTL SDR with following parameters

Samp Rate. 2 MHz Centre Freq 450 MHz Bandwidth 125 KHz

Probably the LDRO would require more fixes in this branch of your code.

Screenshot of the Output

/home/test4/Pictures/Screenshots/Screenshot from 2024-02-20 11-48-03.png

/home/test4/Pictures/Screenshots/Screenshot from 2024-02-20 11-48-23.png

The Recorderd transmission File

3_2024_2_20-10_57_53_4.zip

tapparelj commented 7 months ago

Hello @PKtheanonymousdeveloper, this problem with LDRO and sf5-6 that has also been reported in this issue #76. It's in my todo list and I will have a look when I find some time. Did you, by any chance, tries to use the LDRO with SF>6? If yes, is the output correct or also wrongly decoded?

tapparelj commented 1 week ago

Hello, as it is a duplicate issue and there has been no feedback for some times I will close it.