Introduction to theLTE Physical Layer

Sandor Szilvasi06/29/2016

LTE-SAE Architecture

Source: Anritsu - LTE Resource Guide

LTE Protocol Stack

Source: Anritsu - LTE Resource Guide

Example Waveform (LTE Band 13)

UplinkDownlink

System Information

1. Cell ID = 3 * n_id_1 + n_id_22. MIB3. SIB (not covered here)

Downlink Channel Mapping

1

MIB SIB

3 24

Source: Erik Dahlman, Stefan Parkvall, and Johan Skold. 2013. 4G: LTE/LTE-Advanced for Mobile Broadband (2nd ed.). Academic Press.

Downlink Resource Grid

Source: http://dhagle.in/LTE

50 RBs

1 subframe(1 ms)

1 frame(10 ms)

Demo

PSS

4k ...4k+1 4k+2 4k+3...

frame

subframe

SSS PBCH

Same MIB x4

Open-Source Projects

● OpenAirInterface (https://gitlab.eurecom.fr/oai/openairinterface5g/)● OpenLTE (http://openlte.sourceforge.net/)● srsLTE (https://github.com/srsLTE/srsLTE)● LTE-Cell-Scanner (https://github.com/Evrytania/LTE-Cell-Scanner)● gr-lte (https://github.com/kit-cel/gr-lte)● LTEye (http://www.mit.edu/~swarun/lteyecode.html)

Other Resources

● E-UTRA; Physical channels and modulation (3GPP TS 36.211 Release 13)● E-UTRA; Multiplexing and channel coding (3GPP TS 36.212 Release 13)● Erik Dahlman, Stefan Parkvall, and Johan Skold. 2013. 4G: LTE/LTE-

Advanced for Mobile Broadband (2nd ed.).● Matlab LTE System Toolbox Documentation

http://www.mathworks.com/help/lte/lte-modeling-basics.html● http://niviuk.free.fr/lte_band.php● http://dhagle.in/LTE● http://www.cellmapper.net/map