chemeris

4 ms·

1.
by chemeris 10y ago
Just to make it clear - current "unlicensed" LTE technologies are LTE-U and LAA require an "anchor" channel in a licensed band. I.e. you still can't run it in your home unless you have a license for one other spectr
2.
by chemeris 10y ago
I'm the CEO of Fairwaves ( http://fairwaves.co ). We work with telcos, mostly in developing countries. But there are also customers who run our tech in indegineous communities in Mexico ( https://rhizomatica.org&#x2
3.
by chemeris 10y ago
There is a hope that 3.5GHz Citizen Band will make it possible for smaller companies to run LTE.
4.
by chemeris 10y ago
Speaking of UEs (aka LTE modems) - there is an open-source implementation add well. See srsUE and srsLTE.
5.
by chemeris 10y ago
As mentioned above, half duplex of HackRF would be a limiting factor, unfortunately.
6.
by chemeris 10y ago
HackRF can't do it, because it's only half-duplex. But there are plenty of full duplex SDR devices - check out UmTRX and USRP B210. We're also developing a really tiny high performance SDR specifically for LTE - http:/&
7.
by chemeris 10y ago
Yes. Osmocom/OpenBSC actually started as an open-source "network in a box" which implements all critical GSM network elements in a single executable. It greatly expanded since then - check out a list of projects there. As I
8.
by chemeris 10y ago
That's not true. To run a benchtop setup you just need an inexpensive SDR (LimeSDR, UmTRX or B200) and your laptop - that's not "high thousands". If you're deploying networks professionally, then yes - you'll s
9.
by chemeris 10y ago
Here is a video of tests we're doing at installations with real operators - https://www.youtube.com/watch?v=mxpUXPy1htA (our equipment is almost invisible on the top of the tower, big racks and thick cables are existin
10.
by chemeris 10y ago
USB3 can pump up to 900mA @ 5V = 4.5W, which is pretty good. But each device has its own specs - e.g. LimeSDR has only 10dBm output power, because it doesn't have a built-in amplifier. So if you (1) don't attach a large antenna t
11.
by chemeris 10y ago
That's a really good idea, btw
12.
by chemeris 10y ago
Yeah, we're not as well known as some of the more prominent SDRs out ther. We're mostly targeting professional users and have been mostly focused on figuring out how to get our tech into the real telecom world. Stay tuned - you wi
13.
by chemeris 10y ago
Disclosure: I'm CEO of Fairwaves. Indeed, hardware is the key. You can't run a GSM base station without a good SDR transceiver attached to your PC. :) In 2009 when we tried to launch OpenBTS with a USRP1 (Osmocom didn't work
14.
by chemeris 10y ago
CEO of Fairwaves here. Just want to slightly correct here. We indeed started with OpenBTS, but we switched to Osmocom years ago for a variety of reasons including better code quality and proper community development model. And while we&#x27
15.
by chemeris 11y ago
The answer is to work with legal spectrum owners (aka cellular carriers), which is what we ( https://fairwaves.co ) and other in the space are doing. Someone mentioned that building a full networks (or even a full base station) is