jodhbirs
Newbie level 2

I am generating UWB signal of 2GHz with Matlab sampling frequency(for resolution) of 8GHz.Thus, each UWB pulse has 4 sample values.
Now the number of samples in the received signal are 800.
I do compressed sensing with Phi=randn(400,800)
reconstruct the signal successfully to 800 samples.
Now the question is, the compression in Phi to 400 samples means we are sampling the signal:
1. at 4 GHz (Matlab digital frequency)?
or
2. at 1GHz (signal frequency)?
when I do reduced-rate sampling then do I consider the frequency to be Matlab freq or signal frequency
Moreover, What if both the frequencies are same 2GHz?
Now the number of samples in the received signal are 800.
I do compressed sensing with Phi=randn(400,800)
reconstruct the signal successfully to 800 samples.
Now the question is, the compression in Phi to 400 samples means we are sampling the signal:
1. at 4 GHz (Matlab digital frequency)?
or
2. at 1GHz (signal frequency)?
when I do reduced-rate sampling then do I consider the frequency to be Matlab freq or signal frequency
Moreover, What if both the frequencies are same 2GHz?