Hi. I am using USRP2 testbed. I have been recently working on plotting the PSD of the received signal and I was able to do it. The graph plots the signal in baseband frequency level. Then I turned on the receiver node while keeping the sender node off. When I plotted the PSD graph for that, I was expecting to see a PSD which should be more or less constant over all the frequencies. But I saw a peak in the 0 Hz which is the center frequency. I was told that this is due to DC offset. I am not sure what is meant by that exactly and how to control or measure the DC offset in the output I got. Can anyone help me out?
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