OFDM Spectrum

[Zain89]

I construct an OFDM transmitter use NI USRP-2921 and I want to view an OFDM spectrum signal transmitted. I use niUSRP EX Spectral Monitoring (History) VI, but the result not corresponding with OFDM spectrum theory. What is the block which be used to view OFDM spctrum. The OFDM spectrum result and OFDM spectrum teory include on attachments.

Thanks,

Zai

[Nick-A]

Hi Zai,

Can you go into a little more detail on the hardware you are using?  I notice you are using GNU Radio, do you have multiple USRP devices that you are communicating with?

Can you also clarify what the resolution is on the LabVIEW image that you included?  It appears that they are all within the 5.32 GHz range, but it would be good to clarify how small the resolution is.

Thanks,

Nick

[ErikL]

The USRP 2921 is half duplex so you cannot transmit and receive at the same time. All other NI USRP models are full-duplex.