On Fri, May 4, 2012 at 5:52 PM, frankist <francisco_pais...@hotmail.com>wrote:
> > Hi, > > This question isn't necessarily about GNU Radio but about SDR in general. > > I am studying spectrum sensing algorithms and I was reading about > simultaneous sensing and data transmission or SSDT for out-band sensing. It > means that a radio is capable of transmitting data in one channel and > sensing at another different channel. > > However, using a USRP2, I can only select one center frequency at a time. > Considering I am applying sensing to signals which have a bandwidth of > 6MHz, > in order to transmit/receive data in one channel and sense other > (different) > channels at the same time I need crazy sampling rates that GNU Radio can't > support. A 25 MS/s isn't enough to make a scan for all the ISM Band as I > wanted. > You can tune the RX to one frequency and the TX to a different frequency. This is supported with all motherboards and all daughterboards except the XCVR2450. > > So there are several answers for my problem: > 1. SSDT implies additional hardware making a single USRP2 simply not enough > 2. There is a way to tune different channel frequencies at the same time > without any need to increase the sampling rate or use more than one USRP2 > Yes. Just tune your TX and RX frequencies separately. Matt
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