search

SodaqMoja / Sodaq_nbIOT

Arduino library for the ublox NB-IoT modules
32 stars 16 forks source link

Transmitting packets without being connected to a network #2

Closed justinklchan closed 6 years ago

justinklchan commented 6 years ago

I am living in the United States, where I am aware there is no NB-IoT coverage. I would like to capture NB-IoT packets that are transmitted from this shield as part of a research project.

I am using the NB-IoT Shield DeLuxe (N201, Band 5).

Is there a way I can do that with the current shield or is that not possible? Do I need a SIM card or is there some workaround where I can get the shield to just send arbitrary packets.

I want to note that I intend to transmit the packets along a wire and capture them using a software defined radio. I will not be transmitting them over the air, so there is no legal issue of transmitting on a non-ISM band.

SodaqMoja commented 6 years ago

Would you mind to post this question on our forum? There are (hopefully) more people that can jump in. At http://forum.sodaq.com/

justinklchan commented 6 years ago

I already did that, but it looks like my account is on hold, and my post is waiting approval. Can you approve my account and my post?

justinklchan commented 6 years ago

Ok I posted it here: http://forum.sodaq.com/t/transmitting-packets-without-being-connected-to-a-network/1251

justinklchan commented 6 years ago

Long story short this cannot be done. If anyone wants to accomplish this use the LTE package in Matlab 2017b onwards. Refer to this link: https://www.mathworks.com/examples/lte-system/mw/lte_product-NPDSCHBlockErrorRateExample-nb-iot-npdsch-block-error-rate-simulation-and-waveform-generation

Their example file is pretty good and you can modify the data and modulation schemes, and the file will give you the complex IQ valued signal which can you transmit using a software defined radio.