Questions tagged [usrp]
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18
questions
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0answers
15 views
What modulation is done when I connect a signal source to a USRP block in GNURadio?
When I connect a sinusoidal signal source to a USRP sink and upconvert the frequency, what modulation is done to convert the baseband signal to a passband signal?
0
votes
1answer
36 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
1answer
31 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 ...
1
vote
1answer
36 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 ...
0
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0answers
40 views
Gnuradio fifo cntrl timed out looking for acks
I am using USRP N210 SBX for my experiment. It is a simple TX RX system with a tuning center frequency. I have uploaded the flowgraph.
I am connecting to the USRP using a remote server
CPU MHZ : 2300....
0
votes
1answer
34 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
0answers
35 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 ...
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0answers
475 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 ...
2
votes
0answers
138 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 ...
0
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0answers
669 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 ...
1
vote
1answer
328 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 ...
0
votes
2answers
2k 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 ...
3
votes
2answers
111 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
0answers
2k 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 ...
0
votes
2answers
537 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
1answer
159 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
...
0
votes
1answer
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 ...
9
votes
1answer
5k 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 ...
