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[Discuss-gnuradio] Re: Single-tone test using USRP2 with RFX2400 and XCV
[Discuss-gnuradio] Re: Single-tone test using USRP2 with RFX2400 and XCVR2450
Mon, 27 Apr 2009 06:08:18 +0200
Matt Ettus wrote:
> Yongsang Kim wrote:
> What you are seeing are normal transmitter non-idealities, including DC
> offset (aka carrier feedthrough), and IQ imbalance (aka sideband
> suppression. These can be improved through tuning, but they are not bad
> as is. Also, on the XCVR you are seeing the phase noise skirts as well.
With the XCVR2450 and USRP2, we also observed that the 2MHz (at
appearing at (f_c-2MHz) not (f_c+2MHz) where f_c is the center
seems that the complex conjugate of original baseband signal is
We verified this with OFDM signal which is demodulated
successfully when we flip the left and right of the FFT ouput before
processing (integer frequency offset compensation, channel estimation,
at the receiver.
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