04-18-2013 02:39 AM
Hi everyone,
Currently, I am doing some experiments on niUSRP 2920. My work needs the USRP receive two signals with different carrier frequency. However, the problem I met is that when running two RX Vi, Labview would report the error "niUSRP Fetch Rx Data (CDB WDT).vi<ERR>The specified session handle is invalid or does not correspond to an active session.". Also, I tried to set the channel list in niUSRP configure signal.vi and niUSRP Fetch Rx Data (CDB WDT).vi, but it still does not work. For specific, when I set the channel list to be "1", Labview would be unable to recognize this session.
Is there someone have met this kind of problem. Many thanks for your help.
Sincerely,
Wenjun Xu
04-18-2013 08:27 AM
04-18-2013 09:04 AM
Dear Eric,
Thank you for your quick reply. But I am a little bit of confused on the meaning of '2 signals are close together'. Does it mean that the two signals are similar in frequency?
Moreover, we are trying to configure two antennas (RX1 and RX2) so that they could receive signals on different frequency simultaneously. How could we make it? Thanks!
Best Regards,
Wenjun
04-19-2013 09:59 AM
While there are two input ports, they share the same receive chain through a switch.
The reason for two RX ports:
1. TDMA - (time division) typically one antenna, transmit and receive ad different times
2. FDD - (frequency division) typically 2 antennas, transmitting and receiving at the same time on different frequencies
The USRP supports both configurations with a single TX chain and a single RX chain.
The device does have up to 20MHz bandwidth, so if the two signals total span is less than 20 MHz you can acquire them both at once and then process the two signals.
05-07-2015 02:23 AM - edited 05-07-2015 02:27 AM
@ErikL wrote:
While there are two input ports, they share the same receive chain through a switch.
The reason for two RX ports:
1. TDMA - (time division) typically one antenna, transmit and receive ad different times
2. FDD - (frequency division) typically 2 antennas, transmitting and receiving at the same time on different frequencies
The USRP supports both configurations with a single TX chain and a single RX chain.
The device does have up to 20MHz bandwidth, so if the two signals total span is less than 20 MHz you can acquire them both at once and then process the two s
05-07-2015 02:29 AM
Hello
I want to know something. If I am transmitting from two usrps, can I receive both signals on
single antenna of some other 3rd usrp. what is technique or algorithem?
05-07-2015 06:09 AM
hello
I want to know something. If I am transmitting from two usrps, can I receive both signals on
single antenna of some other 3rd usrp. what is technique or algorithem?
05-11-2015 04:08 AM
05-12-2015 12:33 AM
Actually, whether you can use one antenna to receive the signals depends on the operating frequency of the antenna.
If you want to process signal simultaneously, you should confirm the operating frequency of USRP.
For example, USRP2920 can work from 50MHz to 2.2GHz, but it can process signal within 20MHz simultaneously.
Namely, you can receive and process two different signal with the same antenna simultaneously, if the delta frequency of two signal is within 20MHz.
05-12-2015 06:21 AM