Multi-Way ranging with clock offset compensation

Sark, Vladica; Grass, Eckhard; Gutiérrez, Jesús

doi:10.1109/rtuwo.2015.7365722

Cited by 7 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We focus on the LOS-only link between the BS and the MS. Assuming a narrowband communication using bandwidth B and a carrier frequency f c , and that a preliminary synchronization step has been performed to compensate for the unknown clock offset [12,13], the complex 1 × N BS channel vector at subcarrier n can be expressed as…”

Section: System Modelmentioning

confidence: 99%

Low-Complexity Accurate Mmwave Positioning for Single-Antenna Users Based on Angle-of-Departure and Adaptive Beamforming

Fascista

Coluccia

Wymeersch

et al. 2020

ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

View full text Add to dashboard Cite

The problem of position estimation of a mobile user equipped with a single antenna receiver using downlink transmissions is addressed. The advantages of this setup compared to the classical MIMO and uplink scenarios are analyzed in terms of achievable theoretical performance (Cramér-Rao bounds) considering a realistic power budget. Based on this analysis, a low-complexity two-step algorithm with improved localization performance is proposed, which first performs a (coarse) angle of departure estimation and then precodes the downlink signal to introduce beamforming towards the user direction. Results demonstrate that position estimation in downlink can be potentially much more accurate than in uplink, even in presence of multiple users in the system.

show abstract

Section: System Modelmentioning

confidence: 99%

Low-Complexity Accurate Mmwave Positioning for Single-Antenna Users Based on Angle-of-Departure and Adaptive Beamforming

Fascista

Coluccia

Wymeersch

et al. 2020

ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

View full text Add to dashboard Cite

show abstract

“…We assume that a direct LOS link exists between the BS and the MS, and that additional NLOS paths due to local scatterers or reflectors may also be present. For the sake of the analysis, we also assume that the system has been synchronized during an initial phase using, e.g., a twoway protocol [30], [31]. The different position-related parameters of the channel are depicted in We consider by convention s 0 ≡ p, making all expressions well-defined also for k = 0.…”

Section: B Channel Modelmentioning

confidence: 99%

“…with α, θ and τ complex amplitude, AOD and TOF of a single path, respectively. Replacing (1) with (31) in the derivation of the joint ML immediately leads to the cost function of the singlepath ML estimator, denoted as L 0 (θ, τ ), whose expression can be straightforwardly obtained as a special case of (29) for Θ = [θ τ ] T , which is tantamount to considering K = 0 in the original joint ML estimation problem.…”

Section: B Low-complexity Channel Parameter Estimationmentioning

confidence: 99%

Downlink Single-Snapshot Localization and Mapping with a Single-Antenna Receiver

Fascista¹,

Coluccia²,

Wymeersch³

et al. 2020

Preprint

View full text Add to dashboard Cite

5G mmWave MIMO systems enable accurate estimation of the user position and mapping of the radio environment using a single snapshot when both the base station (BS) and user are equipped with large antenna arrays. However, massive arrays are initially expected only at the BS side, likely leaving users with one or very few antennas. In this paper, we propose a novel method for single-snapshot localization and mapping in the more challenging case of a user equipped with a single-antenna receiver.The joint maximum likelihood (ML) estimation problem is formulated and its solution formally derived.To avoid the burden of a full-dimensional search over the space of the unknown parameters, we present a novel practical approach that exploits the sparsity of mmWave channels to compute an approximate joint ML estimate. A thorough analysis, including the derivation of the Cramér-Rao lower bounds, reveals that accurate localization and mapping can be achieved also in a MISO setup even when the direct line-of-sight path between the BS and the user is severely attenuated.

show abstract

Section: Introductionmentioning

confidence: 99%

“…In particular, the ambiguity introduced by the clock offset cannot be resolved, which implies that the joint Fisher information matrix (FIM) in this setup becomes singular. The standard way to cope with this issue is adopt a conventional two-way protocol for synchronization [10,11], prior to localization. The use of a reconfigurable intelligent surface (RIS) has been recently proposed to address some challenges in radio localization [12], along with the growing interest in communications originated by the capability of the RIS of controlling some propagation channel parameters without any need of baseband processing units [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

RIS-Aided Joint Localization and Synchronization with a Single-Antenna Mmwave Receiver

Fascista

Coluccia

Wymeersch

et al. 2021

ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

View full text Add to dashboard Cite

MmWave multiple-input single-output (MISO) systems using a single-antenna receiver are regarded as a promising solution for the near future, before the full-fledged 5G MIMO will be widespread. However, for MISO systems synchronization cannot be performed jointly with user localization unless two-way transmissions are used. In this paper we show that thanks to the use of a reconfigurable intelligent surface (RIS), joint localization and synchronization is possible with only downlink MISO transmissions. The direct maximum likelihood (ML) estimator for the position and clock offset is derived. To obtain a good initialization for the ML optimization, a decoupled, relaxed estimator of position and delays is also devised, which does not require knowledge of the clock offset. Results show that the proposed approach attains the Cramér-Rao lower bound even for moderate values of the system parameters.

show abstract

Multi-Way ranging with clock offset compensation

Cited by 7 publications

References 6 publications

Low-Complexity Accurate Mmwave Positioning for Single-Antenna Users Based on Angle-of-Departure and Adaptive Beamforming

Low-Complexity Accurate Mmwave Positioning for Single-Antenna Users Based on Angle-of-Departure and Adaptive Beamforming

Downlink Single-Snapshot Localization and Mapping with a Single-Antenna Receiver

RIS-Aided Joint Localization and Synchronization with a Single-Antenna Mmwave Receiver

Contact Info

Product

Resources

About