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open-sdr / openwifi

open-source IEEE 802.11 WiFi baseband FPGA (chip) design: driver, software
GNU Affero General Public License v3.0
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IQ self loop-back Data Retreival #339

Open vishnulatheesh001 opened 9 months ago

vishnulatheesh001 commented 9 months ago

Hii @JiaoXianjun ,

First of all your work you put here is very helpfull and great. I was trying to modify something for my testing purpose I highly appreciate any help from you or your team. I used Open-wifi-notter image and I am able to establish the connection on my Zed Board. I was testing out IQ self loop-back and I was wondering if I could transmit either some file or message and receive the same. In the current example I am not sure where to modify or which data is being injected. To be specific, I want to do Self loop back on my Zed board and transmit some known data and receive the same in receiver side, I also want to know if the example is capable to do the same. If I missed out any example that already exists please point out.

Thanks in advance. Regards Vishnu

A-T-Kristensen commented 9 months ago

Hi,

An example of a file with arbitrary IQ values is given here https://github.com/open-sdr/openwifi/tree/master/user_space/arbitrary_iq_gen. For transmitting this, see https://github.com/open-sdr/openwifi/blob/master/user_space/tx_intf_iq_data_to_sysfs.sh. The documentation is very brief on it, only a little is written here https://github.com/open-sdr/openwifi/blob/master/doc/app_notes/frequent_trick.md#Arbitrary-Tx-IQ-sample.

JiaoXianjun commented 9 months ago

Hii @JiaoXianjun ,

First of all your work you put here is very helpfull and great. I was trying to modify something for my testing purpose I highly appreciate any help from you or your team. I used Open-wifi-notter image and I am able to establish the connection on my Zed Board. I was testing out IQ self loop-back and I was wondering if I could transmit either some file or message and receive the same. In the current example I am not sure where to modify or which data is being injected. To be specific, I want to do Self loop back on my Zed board and transmit some known data and receive the same in receiver side, I also want to know if the example is capable to do the same. If I missed out any example that already exists please point out.

Thanks in advance. Regards Vishnu

You hit the right place -- that app note is what you need. You can define the content of your packet in https://github.com/open-sdr/openwifi/blob/master/user_space/inject_80211/inject_80211.c and check the content of the looped back packet by the tcpdump.

JiaoXianjun commented 9 months ago

Hi,

An example of a file with arbitrary IQ values is given here https://github.com/open-sdr/openwifi/tree/master/user_space/arbitrary_iq_gen. For transmitting this, see https://github.com/open-sdr/openwifi/blob/master/user_space/tx_intf_iq_data_to_sysfs.sh. The documentation is very brief on it, only a little is written here https://github.com/open-sdr/openwifi/blob/master/doc/app_notes/frequent_trick.md#Arbitrary-Tx-IQ-sample.

This is for iq sample injection. If I remember correctly it supports maximum 512 samples. Maybe not that useful.

vishnulatheesh001 commented 9 months ago

Hii @JiaoXianjun , Thank you for your instant reply.

You can define the content of your packet in https://github.com/open-sdr/openwifi/blob/master/user_space/inject_80211/inject_80211.c and check the content of the looped back packet by the tcpdump.

I have tried this but I am not sure where the data is being printed using the command tcpdump -i sdr0

Please point out where to modify in inject_80211.c to generate customised data because in the current code as it was I believe gen_rand_str function is generating data but I am not sure. Please guide me.

Thanks in advance