Re: [Discuss-gnuradio] Is there any correlation between bandwidth and subcarriers-tounes in ofdm?

[Yingjie Chen]

Thanks for your reply.  You mean the bandwidth in receiver side(spectrum analyser) is only half of that of sender side if the active tones is half of the FFT length, is that right? Can you provide the explicit formula for helping me better understand.

2013/3/27 Martin Braun (CEL) <address@hidden>

The fraction of the Nyquist zone occupied is equal to the number of
active tones divided by the FFT length. The actual bandwidth then
depends on your sampling rate.

MB

On Wed, Mar 27, 2013 at 05:54:46PM +0800, Yingjie Chen wrote:
> Hi guys,
>
> I wonder if there is any correlation between baseband bandwidth of
> receiver side and fft-subcarriers-tounes of sender sider in OFDM? When
> I set the bandwidth to 20Mhz in sender side, the spectrum analyzer of
> receiver side shows only half of bandwidth（10Mhz). Does the reason
> that I use 128fft and 64 subcarriers account for this phenomenon?
>
> Sent from my iPhone
>

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