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[Discuss-gnuradio] OFDM benchmark transmit signal bandwidth

From: Guanbo Zheng
Subject: [Discuss-gnuradio] OFDM benchmark transmit signal bandwidth
Date: Thu, 8 Sep 2011 17:47:29 -0500

Hi all

I am currently using OFDM benchmark to generate OFDM signal under the setting of FFT len, CP length, occupied-tones and something.
But I can not find out what is the real bandwidth of signal it generated.
Because when I changed the Interpolation rate (sampling rate), the bandwidth at RX changed as well.
Ideally we know that setting enough large sampling rate ( In USRP2, the max fs = 25MHz), I should observe the constant signal with fixed BW.
It seems to me that BW of the generated signal is too large.

My question is: how to determine the BW of transmit signal in the codes? where I can change it.
All I found is actual bit rate =  (converter_) / xrate / samples_per_symbol = 100MHz/4/2. But this one seems not related to the BW of signal itself.

Thanks for any suggestions!

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