IQ .wav files into an array?

Hi,

Following up from a previous question. I have a signal which comes from an RTL-SDR and I am trying to understand what I am seeing when Matlab gives me an array from a Simulink 'To Workspace' block. I think I am seeing a number and a complex number as shown below:

Represented in the variable as:

The diagram I have atm is:

The reason I want to understand it is I would like to be able to find where a spike is in the array and then grab a range for analysis. So if the spike is in position 100 then I want to take the values from 90 to 110 for example. On top of wanting to know what I am seeing it would be useful to know what it represents. How do you go about identifying a spike or pulse in the signal?

Any help greatly appreciated.

[Rik]

If you want to fully visualize a 2D complex array you will need 4 dimensions. That hints at a fundamental question: what do you define as a spike?

If you attach your variable in a mat file we can use your actual data in any example.

[Colin Crook]

Hi thanks for the response. So my quest into Matlab was to see if I could use it to identify a short burst of LoRaWAN communication from one of my nodes. My nodes hang off a Linux box with a duff hard drive so I have the burst recorded successfully with SDR# but not Matlab so far so I only have a default frequency with random noise. I did think there was enough variation in the Matlab recording though to give me a clue as to how the array behaved to then apply it further.

The file for matlab is attached. For interest the here is a screen from SDR# if it helps at all:

I am getting a new drive tomorrow so I will try to get it recorded with Matlab. The other option I guess is to try to read an IQ.wav file in with the burst included and see what data that gives to compare to the array I am getting. I have no idea how to do that though lol. When I was trying I was messing about with a bit of code I couldn't really get to work.