Dropped samples error in Over the air LTE transmission

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Mugdha Jadhao 2019-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/444051-dropped-samples-error-in-over-the-air-lte-transmission

评论： Yaser Abdallah 2022-10-27

I am trying to implement over the air LTE transmission by following this link: https://in.mathworks.com/help/supportpkg/xilinxzynqbasedradio/examples/lte-transmitter-using-analog-devices-ad9361-ad9364.html

In, Transmission using SDR Hardware(code in above link),

bufferUnderflow = sdrTransmitter(txFrame(:,n));

if bufferUnderflow~=0

warning('Dropped samples')

bufferUnderflow's value is 1 always. Therefore, transmission is not happening due to dropped samples. Some problem is happening with sdrTransmitter object I think.

New to wireless communication and SDR.

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回答（1 个）

Neil MacEwen 2019-2-12

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Hi Mughda,

Underflows are not surprising when trying to stream data in real-time from MATLAB/Simulink to the SDR hardware. Either MATLAB may not keep up with the required sample rate on the hardware, or the Ethernet link between your host PC and the board may not be fast enough. Make sure you use a dedicated network card, or USB3 dongle on your PC.

You can use the transmitRepeat method to work around these limitations. This loads a set of samples onto the board and transmits it repeatedly onto the air. Please see this answer for futher details.

Thanks,

Neil

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Mugdha Jadhao 2019-3-1

Hi Neil,

Thanks for your respnse.

Regards,

Mugdha.

Yaser Abdallah 2022-10-27

Hello Mr MacEwen,

I face the same problem (dropped samples), even though my USRP B210 is connected through USB 3.0!

I am trying to send and receive from two USRP-B210, following the example given from mathworks, but it is not possible at the moment. Any suggestion or idea please??

thanks

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