Localization and Throughput Trade-Off in a Multi-User Multi-Carrier mm-Wave System

Remun Koirala (1, 2, 3) , Benoit Denis (3) , Bernard Uguen (2) , Davide Dardari (1) , Henk Wymeersch (4)

1 UNIBO - Alma Mater Studiorum Università di Bologna [Bologna]
2 IETR - Institut d'Électronique et des Technologies du numéRique
3 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
4 Chalmers University of Technology [Göteborg]

In this paper, we propose various localization error optimal beamforming strategies and subsequently study the trade-off between data and localization services while budgeting time and frequency resources in a multi-user millimeter-wave framework. Allocating more resources for the data service phase instead of localization would imply higher data rate but, concurrently, also a higher position and orientation estimation error. In order to characterize this trade-off, we firstly derive a flexible application-dependent localization error cost function combining the Cramer-Rao lower bounds of delay, angle of departure and/or angle of arrival estimates at a mobile receiver over the downlink. Consequently we devise different fairness criteria based localization error optimal beamforming strategies in a multi-user context. Finally, we show the advantage of the latter beamforming strategies and assess the communication-localization trade-off with respect to various time-frequency resource division schemes.

Keywords: Beam steering; Cramer-Rao bounds; localization; millimeter wave communication; MIMO

Domains: Engineering Sciences [physics]

Remun Koirala, Benoit Denis, Bernard Uguen, Davide Dardari, Henk Wymeersch. Localization and Throughput Trade-Off in a Multi-User Multi-Carrier mm-Wave System. IEEE Access, 2019, 7, pp.167099-167112. ⟨10.1109/ACCESS.2019.2953777⟩. ⟨hal-02498131⟩