[Discuss-gnuradio] USRP2 signal generator and Zigbee radio

[Guanbo Zheng]

Hi,

I am trying to use USRP2 to generating the Gaussian noise,  specifically "usrp2_siggen_gui.py" and "usrp2_siggen.py".
I want to evaluate the performance of TmoteSky under different noise levels.

Here comes the problem:
By combining the Zigbee signal from TmoteSky sensor(transmitter) and noise generated by USRP2, 
the receiver node can not decode any bits, even the generated noise is very low.
While, if remove USRP2 noise, the decoded bits come back.

My understanding is: 
it seems like Zigbee signal is buried by USRP2 noise samples.
Does it because USRP2 generate the noise in much higher sampling rate?

----------------------------------------------------
Tmotesky node:
        packet rate is 000 per sec;  
        bandwidth: 2MHz, 
        Central Frequency: 2.48GHz

USRP2 noise generator
       Clock rate: 100 MHz
       Interpolation rate: 32
       sampling rate 3.125MHz
----------------------------------------------------



-- 
Regards,
Guanbo