The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: [question] problem with real OFDM spectrum
Replies: 0  

Advanced Search

Back to Topic List Back to Topic List  

Posts: 1
From: VN
Registered: 4/6/13
[question] problem with real OFDM spectrum
Posted: Apr 6, 2013 11:06 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Hi all,

I have trouble with spectrum visualization of OFDM signal.

I implemented OFDM system on Stratix II ES180 board and convert the Q-signal to analog via on-board DAC 14bit. I got the result like the figure I attached.
I wonder why the firs edge and end edge of spectrum is far away to each other? the different is large: around 20dB (in the matlab simulation, I got the same level of them)

the second is, there is a mini circuit (transformer) before the DMA output, so, the DC component should be eliminated form signal, why I still get the DC component on the spectrum analyzer (see the figure I attached)

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.