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From: | Daniel Dekst |
Subject: | [Discuss-gnuradio] USRP1 waveform |
Date: | Wed, 16 Feb 2011 00:31:51 +0800 (CST) |
Hi, All, I'm using USRP1 with XCVR2450 daughterboard. I transmit packets with OFDM modulation as in benchmark_ofdm_tx.py. Using usrp_fft.py I detect the wave form as http://www.cse.msu.edu/~huangpe3/music/usrp_fft.png The two edges are attenuated a lot and there is a spike in the middle (DC offset?) What are the reasons for them and can I address them by updating firmware or something else to get better waveforms as those obtained from USRP2? Changing the inerpolation rate changes the (frequency) bandwidth. I know that higher data rate results in wider bandwidth. But here the output rate is fixed by DAC 128 MS/s. Why the bandwidth is changing in accordance with the interpolation rate? Thanks a lot for helping me out! Regards, Pei |
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