Hi I am trying to implement a cognitive radio system for dynamic spectrum access. I am trying to implement it in GNU radio. But the problem is that i have only one USRP at the moment with Basic RX and TX daughterboards. The setup consists of Station A transmitting to Station B. In order to be able to use the licensed spectrum, the transmitter must know which channels are free in the vicinity. Thus it has to do a parallel detection of spectrum as well---receiver mode.
The Transmitter first senses the spectrum for some time say 10ms and then transmits on the free frequency for say 90 ms before sensing the spectrum again and so on. Thus the following questions arise: 1. Can the Station B be implemented on the same USRP when the Station A is only transmitting[not sensing(recieving)]? 2. What effects would this have on the Data Rates and any problem with the USB interface? Is there any built in example within gnuradio with which i can test the simultaneous transmission and reception from the BasicTX to the BasicRX respectively on the same usrp? Regards, Ali
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