Shannon Capacity of LOS MIMO Channels with Uniform Circular Arrays
Paper in proceeding, 2022

The Shannon capacity for the line-of-sight (LOS) multiple-input multiple-output (MIMO) channel between two perfectly aligned uniform circular arrays (UCAs) is derived from the first principles in a tutorial fashion. It is well known that harmonically related complex exponentials (also known in the literature as orbital angular momentum (OAM) modes) are eigenmodes for the spatially continuous channel. We show that the corresponding eigenvalues can be expressed as Bessel functions of the first kind. We also show that the spatially discrete channel between two UCAs with the same finite number of Hertzian dipole antennas on both sides has eigenmodes that are spatially sampled continuous OAM modes, and discrete eigenvalues that are aliased versions of the continuous eigenvalues. Through numerical solution of Maxwell's equations, we verify that the discrete eigenvalues for UCAs with realistic dipole antennas are the same as with the Hertzian dipoles for the studied geometries (1~km hop distance, UCA radius 1 and 2 m, carrier frequency 70 GHz) as long as antenna spacing is not very dense.

Eigenmodes

LOS MIMO

OAM

Degrees of freedom

UCA

Author

Liqin Ding

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Artem Vilenskiy

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Rahul Devassy

Ericsson

Mikael Coldrey

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Ericsson

Thomas Eriksson

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Erik Ström

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

Vol. 2022-September
9781665480536 (ISBN)

33rd IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2022
Virtual conference, ,

Value-of-Information Driven Communication for Connected and Automated Transportation (VoiiComm)

European Commission (EC) (EC/H2020/887732), 2020-10-26 -- 2022-10-25.

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

Signal Processing

Mathematical Analysis

DOI

10.1109/PIMRC54779.2022.9977586

More information

Latest update

10/27/2023