Ettus Research X310 Twin Rx - Unable to run MATLAB Example

Dear Sir,

I am trying to capture signal using Ettus Research X310 Twin Rx.

Everything is fine when I use "findsdru" and "probesdru"

However, I am getting the following error,

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I am using the following codes from MATLAB example.

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rx = comm.SDRuReceiver(...

'Platform','X310', ...

'IPAddress','192.168.10.33', ...

'OutputDataType','double', ...

'IsTwinRXDaughterboard',true, ...

'EnableTwinRXPhaseSynchronization',true, ...

'ChannelMappin',[1 2 3 4]

'MasterClockRate',200e6, ...

'DecimationFactor',200, ...

'Gain',35, ...

'CenterFrequency',2.45e9, ...

'SamplesPerFrame',4000);

frameduration = (rx.SamplesPerFrame)/(200e6/200);

time = 0;

timeScope = timescope('TimeSpanSource','Property','TimeSpan',...

4/30e3,'SampleRate',200e6/200);

spectrumScope = dsp.SpectrumAnalyzer('SampleRate',200e6/200);

spectrumScope.ReducePlotRate = true;

disp("Reception Started");

while time < 10

data = rx();

amp(1) = max(abs(data(:,1)));

amp(2) = max(abs(data(:,2)));

amp(3) = max(abs(data(:,3)));

amp(4) = max(abs(data(:,4)));

maxAmp = max(amp);

if any(~amp)

NormalizedData = data;

else

NormalizedData(:,1) = maxAmp/amp(1)*data(:,1);

NormalizedData(:,2) = maxAmp/amp(2)*data(:,2);

NormalizedData(:,3) = maxAmp/amp(3)*data(:,3);

NormalizedData(:,4) = maxAmp/amp(4)*data(:,4);

end

freqOfFirst = fft(NormalizedData(:,1));

freqOfSecond = fft(NormalizedData(:,2));

freqOfThird = fft(NormalizedData(:,3));

freqOfFourth = fft(NormalizedData(:,4));

angle1 = rad2deg(angle(max(freqOfFirst)/max(freqOfSecond)));

angle2 = rad2deg(angle(max(freqOfFirst)/max(freqOfThird)));

angle3 = rad2deg(angle(max(freqOfFirst)/max(freqOfFourth)));

timeScope([real(NormalizedData),imag(NormalizedData)]);

spectrumScope(NormalizedData);

end

time = time + frameduration;

end

Answer 1

[Harsh]

Hi Anowar,

I understand that you are facing an error while trying to receive signal using X310 USRP.

In the following points, I am suggesting a few steps to resolve this issue:

• “ChannelMapping” property is wrongly spelled in the definition of “comm.SDRuReceiver” that you have shared. Therefore, feel free to use the following definition:

rx = comm.SDRuReceiver(...
                    'Platform','X310', ...
                    'IPAddress','192.168.10.33', ...
                    'OutputDataType','double', ...
                    'IsTwinRXDaughterboard',true, ...
                    'EnableTwinRXPhaseSynchronization',true, ...
                    'ChannelMapping',[1 2 3 4], ...
                    'MasterClockRate',200e6, ...
                    'DecimationFactor',200, ...
                    'Gain',35, ...
                    'CenterFrequency',2.45e9, ...
                    'SamplesPerFrame',4000);

• If the above does not help, please share your MATLAB version and OS information. It will allow to better debug the issue. You can obtain this information by running “ver” command in the MATLAB command line.

[Karunya Choppara]

Yes please update the code as per the suggestions provided in the last answer.

Also get the latest version of Support Package, by checking for the Updates.