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Re: [Discuss-gnuradio] Digital communications between two USRP1

From: Nick Foster
Subject: Re: [Discuss-gnuradio] Digital communications between two USRP1
Date: Tue, 14 Dec 2010 08:30:41 -0800

On Tue, 2010-12-14 at 08:21 -0800, nadia yoza wrote:
> Hi all,
> I want to send and receive data between two different USRP1 (both
> directly connected) using the GMSK modulation at 30 MHz. I am using
> the GMSK mode implemented in GNU Radio. For transmission, I am using
> the LFTX daughterboard and for reception, the BasicRX. 
> As a result, when I transmit at low frequencies(e.g. 10 MHz), all the
> data is always correctly received. However, when I use 30 MHz, the PC
> can receive the data correctly most of the time, but sometimes it
> doesn't receive anything at all. I've also tried with other
> modulations (the types of PSK and QAM implemented in GNU Radio),
> different rates, different longitude of the cables, but the problem
> persists. When tested in a loop using the same USRP for transmission
> and reception, all the data was always correctly received.
> Is there a way to do digital communications using the USRP1 at 30 MHz?
> If so, is there anything I should take into account?
> Best regards,
> Nadia

You need to take into account frequency drift between the two USRPs,
either by manually offsetting the frequency parameters you use or by
performing real frequency estimation in your demodulation.


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