Questions tagged [usrp]
The usrp tag has no usage guidance.
13
questions
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86 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 ...
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0answers
12 views
USRP N210 and FFT
I am getting IQ data from my usrp N210. It has been written in a file as a complex number and I can analyze it with matlab. The IQ data actually resembles the power of my processor. The sampling ...
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0answers
67 views
How to architect a “for loop” (frequency hopping) in gnuradio (companion)?
I have the setup where I send data via USRP Sink over an SDR and receive the response.
However, this needs to be performed at different carrier frequencies, sequentially in time but continuously (the ...
2
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0answers
116 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 ...
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0answers
452 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
261 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 ...
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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
104 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 ...
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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
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2answers
463 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
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1answer
142 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
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1answer
1k 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 ...
8
votes
1answer
4k 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 ...
