Millimeter-Wave Downlink Positioning with a Single-Antenna Receiver
Journal article, 2019

The paper addresses the problem of determining the unknown position of a mobile station for a mmWave MISO system. This setup is motivated by the fact that massive arrays will be initially implemented only on 5G base stations, likely leaving mobile stations with one antenna. The maximum likelihood solution to this problem is devised based on the time of flight and angle of departure of received downlink signals. While positioning in the uplink would rely on angle of arrival, it presents scalability limitations that are avoided in the downlink. To circumvent the multidimensional optimization of the optimal joint estimator, we propose two novel approaches amenable to practical implementation thanks to their reduced complexity. A thorough analysis, which includes the derivation of relevant Cramér-Rao lower bounds, shows that it is possible to achieve quasi-optimal performance even in presence of few transmissions, low SNRs, and multipath propagation effects.


angle of departure (AOD)

massive MIMO




5G cellular networks


Alessio Fascista

Universita del Salento

Angelo Coluccia

Universita del Salento

Henk Wymeersch

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Gonzalo Seco-Granados

Universitat Autonoma de Barcelona (UAB)

IEEE Transactions on Wireless Communications

1536-1276 (ISSN)

Vol. early access

Fifth Generation Communication Automotive Research and innovation (5GCAR)

European Commission (Horizon 2020), 2017-06-01 -- 2019-05-31.

Subject Categories


Communication Systems

Signal Processing



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