Channel Model Mismatch Analysis for XL-MIMO Systems from a Localization Perspective
Paper in proceeding, 2022

Radio localization is applied in high-frequency (e.g., mmWave and THz) systems to support communication and to provide location-based services without extra infrastructure. For solving localization problems, a simplified, stationary, narrowband far-field channel model is widely used due to its compact formulation. However, with increased array size in extra-large MIMO systems and increased bandwidth at upper mmWave bands, the effect of channel spatial non-stationarity (SNS), spherical wave model (SWM), and beam squint effect (BSE) cannot be ignored. In this case, localization performance will be affected when an inaccurate channel model deviating from the true model is adopted. In this work, we employ the MCRB (misspecified Cram´er-Rao lower bound) to lower bound the localization error using a simplified mismatched model while the observed data is governed by a more complex true model. The simulation results show that among all the model impairments, the SNS has the least contribution, the SWM dominates when the distance is small compared to the array size, and the BSE has a more significant effect when the distance is much larger than the array size.


spatial non-stationarity

5G/6G localization

spherical wave model

beam squint effect


Hui Chen

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Ahmed Elzanaty

University of Surrey

Reza Ghazalian

Aalto University

Furkan Keskin

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Riku Jäntti

Aalto University

Henk Wymeersch

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

GLOBECOM - IEEE Global Telecommunications Conference

9781665435406 (ISBN)

IEEE Global Communications Conference
Rio de Janeiro, Brazil,

A New Waveform for Joint Radar and Communications Beyond 5G

European Commission (EC) (EC/H2020/888913), 2020-09-01 -- 2022-08-31.

A flagship for B5G/6G vision and intelligent fabric of technology enablers connecting human, physical, and digital worlds (Hexa-X )

European Commission (EC) (EC/HE/101120332), 2023-10-01 -- 2027-09-30.

European Commission (EC) (EC/2020/101015956), 2021-01-01 -- 2023-06-30.

Subject Categories


Communication Systems

Signal Processing



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