18 Nov
2012
18 Nov
'12
10:05 a.m.
Hi James,
On Sun, 18 Nov 2012 05:40:55 +0100, James Peroulas <james(a)peroulas.com>
wrote:
Hi! I just released a major update to the LTE code.
There's a new program
called LTE-Tracker that camps on a certain frequency and tracks, any LTE
cells that it finds.
Interesting features (all are in realtime):
- You can see cells popping in and dropping off as the receiver is
moved
around the coverage area of the different cells.
- You can see the actual transfer function of the wireless channel
plotted on the screen.
I've also made a small change to CellSearch so that now, it also displays
the number of antennas (ports) on the basestation.
Cool!
Please let me know of any comments or suggestions!
I had to apply the attached patch for it to compile on my machine.
Unfortunately i wasn't able to test the tools, as both of them segfaulted
in xc_peak_freq? Backtrace fragment attached.
LTE Tracker v1.0.0 (release) beginning
Search frequency: 1815 MHz
PPM: 120
correction: 1
Found Elonics E4000 tuner
Calibrating local oscillator.
Segmentation fault
LTE CellSearch v1.0.0 (release) beginning
Search frequency: 1815 MHz
PPM: 120
correction: 1
Found Elonics E4000 tuner
Examining center frequency 1815 MHz ...
Segmentation fault
The old copy of commit ef8474ed5d9213c494e8e17b8436208a04844b1a works just
fine at the same time:
C: CP type ; P: PHICH duration ; PR: PHICH resource type
CID fc foff RXPWR C nRB P PR CrystalCorrectionFactor
262 1815M 595h -24.6 N 100 N one 1.0000447970890209426
263 1815M 595h -25.3 N 100 N one 1.0000447969528891701
Also, i noticed that you calculate the expected tuning frequency for e4k
tuners in order to make your calculations more exact. Can you tell us
which tuning errors you get from the e4k driver usually and how this
affects your application?
Nice documentation & videos! Linked the page on the rtl-sdr wiki.
Best regards,
Dimitri