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LTElepathy: Realtime LTE Localization Toolbox

Hardware

  1. Arduino 0. Arduino UNO 0. Ethernet shield 0. MPU-6050 The wiring of MPU-6050 is 0. VCC -> 3.3V 0. GND -> GND 0. SCL -> A5 0. SDA -> A4 0. INT -> D2
  2. UE 0. 1x USRP-X310 with two LFRX daughterboards 0. 1x USRP-N210 with SBX daughterboard 0. Two demodulators and a power splitter
  3. Simulated eNodeB 0. 1x USRP-X310 with a UBX-160 daughterboard
  4. Miscellaneous 0. Ethernet switch 0. Ethernet cables 0. SMA cables 0. Two line antennas

The whole setup should look like below. Setup.jpg

The wire connections are described in the schematics below. Connection.jpg

Dependency

  1. Master 0. Python requirements

    pip install -r ./master/requirements.txt

  2. Slave - Arduino 0. Arduino IDE

    ARDUINO_PATH=~/Arduino

sudo apt-get install git make gcc ant openjdk-8-jdk
git clone https://github.com/arduino/Arduino.git $ARDUINO_PATH

cd $ARDUINO_PATH/build
ant build
    1. i2cdevlib including I2Cdev and MPU6050
    git clone https://github.com/jrowberg/i2cdevlib.git
cp -r ./i2cdevlib/Arduino/{I2Cdev,MPU6050} ~/Arduino/libraries
    1. Install slave Arduino program via USB
    $ARDUINO_PATH/build/linux/work/arduino --upload ./slave/Arduino/main.ino

  3. Slave - UE 0. uhd 0. srsLTE and build with slave USRP program

    SRSLTE_PATH=~/srsLTE

sudo apt-get install cmake libfftw3-dev libmbedtls-dev libboost-all-dev libconfig++-dev libsctp-dev
git clone https://github.com/srsLTE/srsLTE.git $SRSLTE_PATH

# add this toolbox
mkdir $SRSLTE_PATH/signal-kinetics
echo "add_subdirectory(signal-kinetics)" >> $SRSLTE_PATH/CMakeLists.txt
mv ./slave/USRP/main.c $SRSLTE_PATH/signal-kinetics

# build
mkdir $SRSLTE_PATH/build && cd $SRSLTE_PATH/build && cmake .. && make

Usage

  1. Master Run ./master/main.py to start listening incoming TCP connections. Only when both Arduino and UE are connected it starts to run MCL algorithm. Usually you would want to reset the Arduino first, and wait for around 10 seconds before starting UE program since it takes around 10 seconds for the MPU to settle down to stable state.

  2. Slave - Arduino As soon as Arduino board starts/resets, it would try to connect to server via TCP, and we only need to reset Arduino as we start the experiment.

  3. Slave - UE and simulated eNodeB Run ./slave/USRP/run.sh with proper parameters set as described below. In the script, we first make the slave USRP program 0. IS_CUSTOM: true for our custom eNodeB, otherwise false 0. FREQ: the frequency we are listening to. 739e6 for AT&T stations nearby, and you would probably want to use 915e6, which is with in ISM band for custom eNodeB