Ongoing Projects
Mar. 2017 ~ Feb. 2019
Beamforming Techniques for 5G Millimeter-Wave Wireless Communication Systems
We are developing new millimeter-wave beamforming
technologies for 5G communication Systems.
Jan. 2017 ~ Dec. 2021
Development of Integer-Forcing MIMO Transceivers for 5G & Beyond Mobile Communication Systems
We are developing new MIMO communication technologies
for 5G and beyond cellular communication systems.
Working with Prof. Yang (POSTECH), Prof. Cho (POSTECH), and Prof. Lee (POSTECH)
Aug. 2017 ~ Jul. 2018
Samsung Electronics - Massive MIMO Topics
We are developing new MIMO communication technologies
for 5G and beyond cellular communication Systems.
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Base station
[data] map.xlsx (sheet: basestation)
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Location: The location of BS is defined with the building, where possibly more than two hexahedron components consist of the building. (The map data included in WiThRay zip file is the place around the north gate of KAIST shown in the right side.)
Number of array antenna: The antenna array of BS might have multiple antennas in the horizontal and vertical directions, which can also be manipulated on [daba] map.xlsx.
Direction of array antenna:The default direction of the antenna array is [0, -1, 0], where the horizontal antennas are aligned in [1, 0, 0], and the vertical antennas are aligned in [0, 0, 1]. The heading direction of the array antenna can be calibrated with angles of rotation and tilt.
Polarization of array antennas: WiThRay supports two types of polarization antenna structures; single pol in the vertical direction (single-ver) and double pols in two orthogonally diagonal directions.
Interval of array antennas: The interval of array antennas can be defined in two ways. If you want to set the antenna interval as a half lambda, fill in half lambda in "intv. of antennas." The antenna interval can also be defined manually by writing the exact distance in meter [m].
BS: base station
IRS: intelligent reflecting surface
UE: user equipment
VEH: vehicle
Tx: transmitter
Rx: receiver
RT: ray tracing
PG: propagation graph
OFDM: orthogonal frequency division multiplexing
[KAIST around the north gate]
IRS
[data] map.xlsx (sheet: irs)
Location: The location of IRS is defined with the building, where possibly more than two hexahedron components consist of the building. Since the IRS is installed at the side wall of the building, which side to put up should also be defined.
Number of array panels: The IRS might have multiple panels in the horizontal and vertical directions, which can also be manipulated on [daba] map.xlsx.
Interval of array panels: The interval of array panel can be defined in two ways. If you want to set the panel interval as a half lambda, fill in half lambda in "intv. of cell." The cell interval can also be manually defined by the exact distance in meter [m].
Subcell setting: The IRS model in WiThRay is introduced in [1], where the discrete cell type panel consists of multiple subcells in the array structure. Thus, the number and size of subcells should be defined.
[1] M. Najafi, V. Jamali, R. Schober and H. V. Poor, "Physics-Based Modeling and Scalable Optimization of Large Intelligent Reflecting Surfaces," in IEEE Trans. on Commun., vol. 69, no. 4, pp. 2673-2691, April 2021.
[Discrete-cell-type panel]
[data] map.xlsx (sheet: ue)
UE
Number of array antenna: The antenna array of UE might have multiple antennas in the horizontal and vertical directions, which can also be manipulated on [daba] map.xlsx.
Antenna type: WiThRay supports two types of antennas for UE; a dual-pol antenna and a plate antenna.
Interval of array antennas: The interval of array antennas can be defined in two ways. If you want to set the antenna interval as a half lambda, fill in half lambda in "intv. of antennas." The antenna interval can also be defined manually by writing the exact distance in meter [m].
Speed: In the trajectory-type data, the consecutive positions of UE are first defined with the speed of UE. The grid-type data does not use this parameter.
Height: The UE might be placed far from the ground.
VEH
[data] map.xlsx (sheet: veh)
Vehicle type: Three types of vehicles are modeled in WiThRay; car, SUV, and bus.
Speed: In the trajectory-type data, the consecutive positions of VEH are defined with the speed of VEH. The grid-type data does not use this parameter.
Physical coefficient (reflection): According to the material of vehicle, the reflecting coefficient can be defined.