Questions tagged [usrp]

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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 <...
Bryan Busby's user avatar
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22 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 ...
Muhammad Danyal Khattak's user avatar
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52 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 ...
Ahsan Yousaf's user avatar
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1 vote
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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. ...
Austin Seward's user avatar
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40 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, ...
Austin Seward's user avatar
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0 answers
35 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
Navkaran Ghumman's user avatar
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52 views

Different (incorrect) estimation of SNR values at reception

I want to estimate the SNR value at the input of my USRP. To do this, I connect two blocks: MPSK SNR Estimator and MSPK SNR Estimator Probe. Next, I look at the values that I got using the MSPK SNR ...
Ice Cool's user avatar
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0 answers
62 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 ...
Ice Cool's user avatar
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53 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 ...
Azamat Nassipkaliyev's user avatar
1 vote
1 answer
88 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). ...
Ze Zh's user avatar
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1 answer
111 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 ...
wesam amiri's user avatar
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1 answer
100 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 ...
wesam amiri's user avatar
2 votes
1 answer
254 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 ...
Amaury's user avatar
  • 21
-1 votes
1 answer
58 views

gnuradio , SDR usrpx300

I use usrp x300 SDR. I'm confused about Bandwidth and sample_rate. How do I calculate them? is ...
Rami Mrzk's user avatar
1 vote
0 answers
242 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 ...
Ed_Sheherazade's user avatar
0 votes
1 answer
445 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: ...
Ze Zh's user avatar
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1 vote
1 answer
49 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 ...
Michaelzen's user avatar
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115 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 ...
Matthew Hilts's user avatar
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0 answers
178 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&...
Ali's user avatar
  • 95
0 votes
1 answer
579 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 ...
George Willis's user avatar
0 votes
1 answer
736 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 ...
Okan Erturk's user avatar
1 vote
1 answer
176 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 ...
Cosinux's user avatar
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0 answers
14 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 ...
LSL's user avatar
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0 votes
2 answers
172 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 ...
kit_traverse's user avatar
-1 votes
1 answer
217 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 @ ~...
not_fogarty's user avatar
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 ...
MagicMan's user avatar
1 vote
1 answer
260 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 ...
MagicMan's user avatar
0 votes
1 answer
253 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 ...
Avishek Banerjee's user avatar
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0 answers
480 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 ...
Caleb Martin's user avatar
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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 ...
vperekadan's user avatar
3 votes
0 answers
346 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 ...
Eric Gaulke's user avatar
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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 ...
Hadad's user avatar
  • 101
2 votes
1 answer
791 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 ...
David's user avatar
  • 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 ...
Zman147's user avatar
3 votes
2 answers
159 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 ...
Tomislav Nakic-Alfirevic's user avatar
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 ...
user34533's user avatar
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 ...
mpetitjean's user avatar
-1 votes
1 answer
304 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 ...
Leroy's user avatar
  • 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 ...
Vladislav Martin's user avatar
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 ...
Tihomir Meščić's user avatar