OTFS-superimposed PRACH-aided Localization for UAV Safety Applications

Linsalata, Francesco; Albanese, Anthony A.; Sciancalepore, Vincenzo; Roveda, Francesca; Magarini, Maurizio; Costa‐Pérez, Xavier

doi:10.1109/globecom46510.2021.9685862

Cited by 14 publications

(3 citation statements)

References 13 publications

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“…After the MMSE equalization for Y DD , the estimated signal XDD in the DD domain is obtained. The MMSE equalization used in this paper is a basic MMSE approach that can be expressed as follows [9]:…”

Section: Otfs-im Frame With Durationmentioning

confidence: 99%

OTFS-IM Modulation Based on Four-Dimensional Spherical Code in Air-to-Ground Communication

Gu,

Guo,

Jin

et al. 2023

Drones

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Unmanned aerial vehicles (UAVs) have been widely utilized for their various advantages. However, UAVs exhibit high mobility and energy storage restrictions in some applications, which can compromise the quality and reliability of communication links. This is a challenge that future aircraft and low-orbit aircraft will inevitably encounter. To effectively address the issue of dynamic Doppler spread in air-to-ground communication, this paper creatively introduces four-dimensional spherical code modulation into the orthogonal time–frequency space with an index modulation (OTFS-IM) system. The fundamental concept of the four-dimensional spherical code is elaborated in detail. Multiple resource symbols can be jointly used to increase the modulation dimension, thereby achieving a larger minimum Euclidean distance between constellation points. Furthermore, detailed analysis is conducted on the bit error rate (BER) and the peak-to-average-power ratio (PAPR) expressions of the proposed system to evaluate its performance and provide theoretical guidance. The proposed scheme not only adapts well to high-speed scenarios but also achieves better power consumption efficiency. The simulation results demonstrate that our proposed scheme outperforms conventional methods. Its robustness and generalization ability are also validated.

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Section: Otfs-im Frame With Durationmentioning

confidence: 99%

OTFS-IM Modulation Based on Four-Dimensional Spherical Code in Air-to-Ground Communication

Gu,

Guo,

Jin

et al. 2023

Drones

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“…Time-domain OTFS-based ToA estimation in the presence of carrier frequency offset for a single-user is discussed in [20]. Moreover, for a single-UAV application and a sparse wireless channel, OTFS-based ToA estimation is presented in [21].…”

Section: Introductionmentioning

confidence: 99%

Precise Positioning: When OTFS Meets Distributed Cooperative Positioning

emadi¹,

Hu²,

Wang³

2023

Preprint

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<p>Precision positioning plays critical roles in 5G-Advanced and 6G systems for various indoor and outdoor applications. Conventionally, positioning accuracy can be dramatically degraded under non-line-of-sight channels or with moving terminal nodes (TNs). To overcome this issue, we propose an orthogonal time-frequency space (OTFS) based positioning with applying distributed cooperative positioning (DCoP) at the ends of TNs, which can yield an ultra-most precise positioning. This is so, since the positioning with OTFS is robust against channel delays and Doppler spreads, and superior to conventional orthogonal frequency-division multiplexing (OFDM) based positioning. Further, DCoP uses cooperations such that TNs can serve as additional anchor nodes (ANs) to others, and improves the positioning accuracy for all. With this proposal, we further elaborate the positioning-reference-signal with OTFS (PRS-OTFS) in delay-Doppler (DD) domain, and design an OTFS-transceiver that is backward compatible to OFDM. Furthermore, we also propose a DD-domain time-of-arrival estimation algorithm that exploits the OTFS waveform and outperforms conventional time-frequency based estimators. Moreover, we propose a loopy belief-propagation algorithm associated with belief-discretizing for an effective implementation and message exchange in DCoP. In addition, we show that the average Cramer-Rao low-bound per TN can decrease faster than linearly in the number of cooperating TNs. We illustrate with simulations that the proposed OTFS-DCoP scheme is very effective in improving positioning accuracy within a few iterations, and robust against double-selective channels. </p>

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“…Ref. [12] employs OTFS modulation to construct a 5G-NR transmitting and receiving scheme that can be applied on unmanned aerial vehicles (UAVs) to perform accurate measurements of arrival time even in high-mobility scenarios. In addition, to address the challenges of high mobility in V2X systems, ref.…”

Section: Introductionmentioning

confidence: 99%

GAMP-Based Low-Complexity Sparse Bayesian Learning Channel Estimation for OTFS Systems in V2X Scenarios

Zheng,

Wang,

Wang

et al. 2023

Electronics

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Vehicle to everything (V2X) is widely regarded as a critical application for future wireless communication networks. In V2X, large relative speeds between vehicles may severely deteriorate the performance of communication between vehicles. Orthogonal time frequency space (OTFS) modulation, which converts time- and frequency-selective channels into non-selective channels in the delay-Doppler (DD) domain, provides a solution for establishing reliable wireless communications in V2X scenarios. However, in the complex multi-scattering scenarios, the channel also suffers from a serious inter-Doppler interference (IDI) problem, which poses a great challenge to the accurate demodulation of OTFS receiver signals. To address the above problems, this paper considers the variation of Doppler sampling points within one symbol when deriving the channel model, which effectively overcomes the IDI problem, and employs a basis expansion model (BEM) to convert the channel estimation into a sparse recovery problem for the basis coefficients. In addition, to better utilize the sparse nature of the OTFS channel, a generalized approximate message passing-sparse Bayesian learning (GAMP-SBL)-based algorithm is employed to estimate the basis coefficients of the channel. The complexity of this algorithm is greatly reduced compared to the conventional SBL algorithm. Finally, system simulation results are reported to verify the superiority of the proposed scheme.

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OTFS-superimposed PRACH-aided Localization for UAV Safety Applications

Cited by 14 publications

References 13 publications

OTFS-IM Modulation Based on Four-Dimensional Spherical Code in Air-to-Ground Communication

OTFS-IM Modulation Based on Four-Dimensional Spherical Code in Air-to-Ground Communication

Precise Positioning: When OTFS Meets Distributed Cooperative Positioning

GAMP-Based Low-Complexity Sparse Bayesian Learning Channel Estimation for OTFS Systems in V2X Scenarios

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