#### jodhbirs

##### Newbie level 2

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?