How to use LTE_DL_receiver script

[blackndwhite20]

Hello,

I've followed the steps described in readme:
-I used Cell_Search to find the frequency of some BaseStations
-Afer that, I used LTE-Tracker to monitor one of the frequencies. I saw that it didn't generate any output file so I used "-z file.bin" in order to create one. Is it ok? Do I have LTE information in this file?
-The next step is: 0x02.3 LTE_DL_receiver . I think, the binary file generated in the previous step should be given as a parameter to this script. Am I right? But I don't know how to run it. Do I need to install Matlab and open the script? Or what am I supposed to do with that binary file generated in order to decode it.

Thanks

[JiaoXianjun]

Now I have restructured the readme. I believe it is much better than before now. Would you please check?

[MatejKovacic]

Sorry, if my question is stupid, I have never used Octave or Matlab, but I am quite familiar with different RTL-SDR applications.
I have compiled and run LTE-Cell-Scanner on Ubuntu 20.04 and installed Octave. Then I run LTE_DL_receiver:

octave:1> LTE_DL_receiver(796);

And I got the following error:

sh: 1: hackrf_info: not found

  probe: No devices are available. If one is attached, ensure it
         is not in use by another program and that the current
         user has permission to access it.

[INFO] [UHD] linux; GNU C++ version 9.2.1 20200304; Boost_107100; UHD_3.15.0.0-2build5
No UHD Devices Found
Found 1 device(s):
  0:  Generic, RTL2832U, SN: 77771111153705700

Using device 0: Generic RTL2832U
Found Rafael Micro R820T/2 tuner
rtl_biast, a tool for switching the RTL-SDR.com
bias tee or any GPIO ON and OFF. Example to activate
the bias tee: rtl_biast -d 0 -b 1
Any GPIO:     rtl_biast -d 0 -g 1 -b 1
rtl_biast version 0.8 github.com/librtlsdr (Sep 21 2021)
rtl-sdr   library 0.8 github.com/librtlsdr (Sep 21 2021)

Usage:	rtl_biast [-options]
	[-d device_index (default: 0)]
	[-g GPIO select (default: 0)]
	[-b set write bias_on (default: 0, in output mode)]
	[-r read pin (in input mode)]
	[-w write pin (in output mode)]
	[-s read all GPIO pins status (0 = write, 1 = read ?? )]
	[-R read all GPIO pins ?? ]
No sdr board found!

My RTL-SDR USB key is inserted, is it possible, that LTE_DL_receiver works only with HackRF??