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Re: [Discuss-gnuradio] openLTE annoucement
From: |
Jiao Xianjun |
Subject: |
Re: [Discuss-gnuradio] openLTE annoucement |
Date: |
Wed, 13 Aug 2014 08:08:04 +0000 (UTC) |
User-agent: |
Loom/3.14 (http://gmane.org/) |
Ben Wojtowicz <bwojtowi <at> gmail.com> writes:
>
> I am pleased to announce version 00.05 of openLTE, an open source LTE
> project (sourceforge.net/projects/openlte). This version includes a
> gnuradio application that reads recorded I/Q downlink LTE data from a
> file, decodes MIB and SIB1, and displays the decoded information.
> This information includes:
> - Measured frequency offset
> - System Frame Number
> - Physical Cell ID
> - Number of transmit antennas
> - Bandwidth
> - PHICH format
> - PLMN Identity
> - Tracking Area Code
> - Cell ID
> - Cell Barred information
> - Reselection information
> - Frequency band
> - System Info scheduling
> - Duplexing mode
>
> This version requires input data to be interleaved 8-bit I and Q (I
> first) recorded at 30.72MSPS centered on an LTE channel. Please see
> the README file for installation and usage.
>
> There are limitations with this version that will be addressed in the
> future. Some of the more pertinent ones are:
> - Only handles FDD
> - Only handles normal cyclic prefix
> - Only handles DCI 1A with localized VRBs on the PDCCH
> - Only handles normal PHICH duration
>
> Enjoy,
> Ben
>
Good!
One more information I can offer is that actually we don't need 30.72Msps as
it in 3GPP spec. I have developed an LTE Downlink Receiver which works on
19.2Msps for 100RB LTE system and it decodes actual 4G/LTE (both TDD and
FDD) signal in field Beijing successfully (SIB information is parsed finally).
Why 19.2Msps is important? I think some cheap SDR front-ends will benefit
from that, such as hackRF which only support ~20Msps and 20MHz bandwidth.
The method is simple: 19.2*8/5 = 30.72, which is a general fractional
sampling rate conversion method in Digital Signal Processing.
See the project here: github.com/JiaoXianjun LTE-Cell-Scanner project.
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