Questions tagged [usrp]
The usrp tag has no usage guidance.
42
questions
0
votes
0
answers
37
views
Issues Receiving Signal with USRP B210 in MATLAB vs Simulink
I am new to signal processing and appreciate your understanding as I seek assistance.
I am trying to receive a signal generated by a signal generator using the USRP B210, and I am working with both ...
- 23
0
votes
1
answer
48
views
Recording two GPS L bands simultaneously with USRP N310
I have been using a USRP N310 to record GPS L1 RF data into a file, which I later use to test a GNSS software receiver (gnss-sdr).
Now I am interested in testing the receiver in dual-band operation ...
0
votes
0
answers
16
views
Modulating HDLC frames in GNURadio
I'm trying to modulate HDLC frames in GNURadio for transmission over an ETTUS USRP radio. I receive UDP packets via a TUNTAP interface in TUN mode and pass the resulting PDUs to a HDLC framer. If I ...
- 1
0
votes
0
answers
51
views
GNU Radio can't find my USRPB205
I connected my USRPB205mini-i and tried running the following flowchart
but I keep getting,
RuntimeError: LookupError: KeyError: No devices found for -----
Empty Device Address
Here's the rest
<...
0
votes
0
answers
35
views
TRANSMIT 16QAM 5MHz Signal Via NI USRP 2900
I am trying to generate 5MHz signal. I am using NI USRP with matlab. I have extended the existing MATLAB QPSK Tx Rx to 16QAM, Now i am struggling with advacing the testbed to send and receive 5MHz ...
0
votes
0
answers
99
views
USRP X310 not receiving anything but noise
I have been trying to receive different types of signals using a USRP X310 but all I can receive is noise. I tried different types of antennas and designed many different kinds of blocks but I get ...
- 1,593
1
vote
0
answers
32
views
USRP N210 B & F Lights
During setup of a USRP N210 on MATLAB's Communications Toolbox Support Package for USRP Radio, the initial test failed on "Receive the signal and verify the frequency of the tone" field. ...
0
votes
0
answers
96
views
USRP N210 Connection Issues on Ubuntu 22.04 VirtualBox VM
I am running into consistent connection issues when trying to run a USRP N210 on a VirtualBox Ubuntu 22.04 VM. I built uhd from source on the ettus page, configured a static IP address in Ubuntu, ...
0
votes
0
answers
44
views
FMCW RADAR using Phased Array Antenna
I need assistance to calculate angle of arrival using MUSIC algorithm for Phased Antenna Array with GNU radio and USRP
#Zeeshan
0
votes
0
answers
85
views
OFDM does not work with USRP
I found the ofdm flowchart in the Gnu radio examples.(ofdm_loopback)
Scheme:
The spectrum and the received data of the received signal:
After that, I connect the USRP Sink and the USRP Source.
The ...
- 1
0
votes
0
answers
75
views
Is there any way to fix USRP that doesn't connect?
I am new to SDR. But I have an USRP X310. Installed UHD and GNU Radio from source on Ubuntu 20.04. Connected to the USRP with SFP+ through the port 1 and powered the USRP. But the LED of the ethernet ...
1
vote
1
answer
108
views
Questions about the output sampling rate of the DUC(interpolation filter) of the USRP N210
I am using MATLAB to simulate the DUC and DDC process of USRP N210. I have encountered some doubts. As I understand the DUC, the sampling rate of the incoming signal is set by the user (e.g. 12.5M). ...
- 13
0
votes
1
answer
120
views
Phase Measurements of OFDM Signal with USRP
I am doing some analysis on a received OFDM signal using USRP N210 with GNURadio. Figure OFDM RX shows the OFDM receiver (please refer to GNURdaio workshop slides) . The transmitted OFDM signal is ...
- 51
0
votes
1
answer
120
views
USRP Frequency Drift Measurement
I trying to measure the frequency drift between two N210 USRPs using GNURadio Companion.
I used one USRP as a TX and the other one as an RX. The transmitted signal is a complex sinusoidal.
The issue ...
- 51
2
votes
1
answer
307
views
USRP N310 RX gain lower than other SDR with same GNURadio script
In my company, we are using a GNURadio script with a PlutoSDR to receive packets coming from a transmitter located very far away. The receive power is really weak, our antenna is receiving something ...
- 21
-1
votes
1
answer
67
views
gnuradio , SDR usrpx300
I use usrp x300 SDR.
I'm confused about Bandwidth and sample_rate. How do I calculate
them? is ...
1
vote
0
answers
288
views
GNURadio 3.8 QPSK : Hard time to recover the right symbols/data
Cheers, I am demodulating a QPSK signal on GNURadio, the data transmitted is a known HEX file with the "1ACFFC1D" foreword every 124 bytes, to check if the demodulation is a success, it ...
0
votes
1
answer
514
views
USRP N210 Main clock rate and The transmission signal Sampling Rate
I am testing the transmission and receiving signal using two USRP N210. The communication setting as follows:
...
- 13
1
vote
1
answer
60
views
Periodic Jumps in received signal
I am doing some preliminary tests to check the behaviour of two USRPs. The setup is simply an USRP B210 connected via cable to a N310. The B210 is sending a constant 1 at 2,48 GHz, the N310 is just ...
- 11
0
votes
0
answers
130
views
How do I set GNU Radio Es/No?
I am trying to create a random signal in GNU Radio (using DVB-S2 specs for the physical layer) and transmit this signal using a USRP X310. This is shown below:
Problem: I would like to be able to ...
0
votes
0
answers
190
views
GNU Radio and USRP audio source problem
I have a modem which accepts a voice in GNU Radio, digitizes and compresses it (codec2) and transmits it using USRP on one laptop and receives it on another laptop.
When I use "Wave File Source&...
- 95
0
votes
1
answer
750
views
Undersampling in GNU Radio
I'd like to implement a FHSS receiver in GNU Radio, using a USRP B210. The total bandwidth of the signal is about 30 MHz, with each message having a bandwidth of about 200kHz. When I attempt to ...
0
votes
1
answer
863
views
GNU Radio, Frequency Hopping Spread Spectrum for High Hopping Intervals
I am planning to implement a frequency hopping spread spectrum transmitter and receiver in GNU Radio. In my project, the bandwidth of the message signal is around 200 kHz and the maximum frequency ...
- 423
1
vote
1
answer
219
views
Confusion about the frequency of a signal recorded with a USRP
In my assignment I am provided with a recording of a radio signal that was supposedly done in the AM spectrum with a USRP, and I am told to process it in various ways with GNURadio. However, the ...
- 123
0
votes
0
answers
15
views
Doubt about sampling rate and spectrum with USRP and gnuradio [duplicate]
I have started working recently with software defined radio (SDR) as well as gnuradio. I have worked with digital signal processing for a while and one feature at one tutorial, which I saw for ...
- 1
0
votes
2
answers
188
views
Can I create my IF signal on SDR before bringing data to PC?
I'm relatively new to SDR's and I'm trying to determine what sort of BW I need for my laptop to get the best resolution possible for an FMCW system. I have an X310 Ettus with a UBX160 daughtercard ...
- 15
-1
votes
1
answer
240
views
Unstable frequency/phase when using external reference for Ettus B200
I am attempting to do a simple record of a CW, 250MHz signal at the Rx port of an Ettus B200 using an Anritsu MG369 signal generator. I am using the 10 MHz ref signal provided by the SG (output @ ~...
0
votes
1
answer
1k
views
How is the Tx/Rx Gain calculated in USRP?
I know that USRPs are uncalibrated devices. In many exampls you can set the so called Tx or Rx gain (as in the picture below).
Now, I know that this does not correspond to the real power of the ...
- 83
1
vote
1
answer
285
views
Calculating transmitter power from spectral density
I want to find out what is the real transmit power of my USRP 2922, unfortunately the only results I get when looking at the spectrum analyzer is the spectral power density.
These are the results of ...
- 83
0
votes
1
answer
307
views
LoRa sensing using USRP GNURADIO
I made a simple RF sensing using USRP N210. I am trying to detect LoRa transmission.
A LoRa Node is operating at 915 MHz with Spreading Factor 8 and bandwidth 500 kHz.
I have used a USRP UHD Source ...
0
votes
0
answers
526
views
Finding time of arrival of signal using GNU radio
I am sending a repeating BPSK modulated PN sequence signal from a USRP x310 transmitter. I am receiving the sequence with another USRP x310. Both are attached to an octoclock. Is there a way to get ...
0
votes
0
answers
4k
views
16 QAM GNU Radio
I have been trying to implement a transmitter receiver flow graph which uses 16 QAM. I am using a USRP B200 as the transmitter and a RTL-SDR as the receiver.
I used uhd_packet_tx.grc and ...
3
votes
0
answers
373
views
Having trouble transmitting/receiving a BPSK signal using two USRPs
I am relatively new to working with SDRs and GNURadio and I am attempting to generate a BPSK signal and transmit it through one USRP and receive and demodulate it on another USRP. I am using GNURadio ...
- 31
0
votes
0
answers
2k
views
Not sure why I get errors of missing blocks when trying examples in Gnuradio Companion
I just started working with GNURadio without much of familiarity about this software. I found a couple examples online and I tried to run them but I get many Missing Block errors.
Thats how it looks ...
- 101
2
votes
1
answer
845
views
Best way to resample an OFDM signal without interpolating + filtering?
I am working on a custom transceiver with a sampling rate of 3.84 MHz (256 OFDM subcarriers at 15 kHz, although 56 subcarriers are null). I would like to resample the signal to 5 MHz, in order to use ...
- 21
-1
votes
2
answers
3k
views
GNU Radio QPSK 4 Symbols
I'd like to generate a simple QPSK signal in GNU radio, but so far I haven't been able to get it to perform the way I'd like and I'm not sure if this has to do with some misunderstanding I have about ...
- 1
3
votes
2
answers
166
views
Could 2 synchronised RX chains be used to receive a signal too wide for just one of them?
Say the goal is to demodulate a "wide" signal, e.g. 300 MHz wide. An SDR is available with a maximum RX bandwidth of 150 MHz (ADC sampling freq. limitation), but it comes with 2 RX channels sharing ...
1
vote
0
answers
4k
views
USRP + GNU Radio as 1 GHz bandwidth spectrum analyzer
I have maybe not trivial but some interesting question.
I need to create 802.11ac channels spectrum analyzer with USRP.
Hardware: USRP B210
Software: GNU Radio 3.7.9
PC: Intel Core i3 i3210m 16 GB ...
- 11
0
votes
2
answers
1k
views
Bandpass filtering IQ samples from USRP
I have an USRP (B205mini) with an RX frequency of 900 MHz and a bandwidth of 100 MHz. I want to distinguish between two raw, unmodulated signals at respectively 875 and 925 MHz.
My approach would be ...
-1
votes
1
answer
328
views
Weird noise floor slope when capturing with USRP E310
I'm experiencing a weird effect on my captures. It may just be due to my bad dsp understanding.
I'm using an E310 SDR platform to capture a multitone (4 carriers) signal:
Fc = 150 MHz
Bw = 286 KHz
...
- 3
0
votes
1
answer
2k
views
Possible to Derive Receive Signal Power from RSSI?
My Set-Up
I am sending packets at a specific frequency and with a specific gain from one N-210 USRP to another of the same model.
NOTE: I have the transmitting USRP connected to a series of ...
- 212
9
votes
1
answer
7k
views
Large spike at the center frequency when using Ettus X310
I am using the Ettus X310 SDR and GNU radio. On the GNU radio schema I have a standard UHD USRP source block connected to a GUI FFT sink - basically I'm just displaying the spectrum of the raw signal ...
- 193