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From: | hamzeh elsayed |
Subject: | gr-ieee802-11 with USRP N210 and B200mini problems |
Date: | Tue, 10 Dec 2019 11:33:17 +0200 |
I installed the gr-ieee802-11 project and run the wifi_loopback.grc file and the output is correct. Then I edited the file to transmit and receive from socket using “socket PDU” block, also the output is correct. After that, I tried to transmit and receive from USRP SDRs, the following are the tested I done:
1- I transmit and receive from the same SDR “B200mini” with the same configuration found in the wifi_transceiver.grc file.
a. If the rx_gain and tx_gain are approximately 0.27 (normalized) and encoding BPSK 1/2 , then the sent data are received for (95%) and the constellation sink is approximately good.
b. If the rx_gain and tx_gain are less than or greater than 0.27 and encoding BPSK 1/2 , then any data id not received and the constellation sink is very bad.
c. If the encoding is anyone except BPSK ½ for example 16 QAM ½ etc.. any data is not received for any value of gain.
2- I transmit and receive from the same SDR “N210” with the same configuration found in the wifi_transceiver.grc file. Any data is not received for any gain and encoding configurations.
3- I transmit from USRP N210 and received from B200mini also any data is not received for any gain and encoding configurations.
4- I transmit from USRP B200mini and received N210 from B200mini also any data is not received for any gain and encoding configurations.
Tests were done by using the following:
OS: Ubuntu 16.04 LTS
Gnuradio: 3.7.11
First SDR: USRP N210 with CBX daughter board
Second SDR: B200mini
Frequency: 2.415Ghz
Bandwidth: default (0)
Therefore,
1- what are the best settings I have to select in order to transmit and receive data correctly for all cases?
2- how to select the best gain for any SDR?
3- Is there any relation between the SDR type and gain and the application?
4- In general, where is the problem or the mistake I am doing?
in advance, thanks for your time and help.
Best Regards,
Hamzeh Elsayed
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