| 1. |
-
- 2019
-
Tidskriftsartikel (refereegranskat)
|
|
| 2. |
- Chen, Hui, 1992, et al.
(författare)
-
Doppler-Enabled Single-Antenna Localization and Mapping Without Synchronization
- 2022
-
Ingår i: GLOBECOM - IEEE Global Telecommunications Conference. ; , s. 6469-6474
-
Konferensbidrag (refereegranskat)abstract
- Radio localization is a key enabler for joint communication and sensing in the fifth/sixth generation (5G/6G) communication systems. With the help of multipath components (MPCs), localization and mapping tasks can be done with a single base station (BS) and single unsynchronized user equipment (UE) if both of them are equipped with an antenna array. However, the antenna array at the UE side increases the hardware and computational cost, preventing localization functionality. In this work, we show that with Doppler estimation and MPCs, localization and mapping tasks can be performed even with a singleantenna mobile UE. Furthermore, we show that the localization and mapping performance will improve and then saturate at a certain level with an increased UE speed. Both theoretical Cram´er-Rao bound analysis and simulation results show the potential of localization under mobility and the effectiveness of the proposed localization algorithm.
|
|
| 3. |
- Ge, Yu, 1995, et al.
(författare)
-
A Computationally Efficient EK-PMBM Filter for Bistatic mmWave Radio SLAM
- 2022
-
Ingår i: IEEE Journal on Selected Areas in Communications. - 0733-8716 .- 1558-0008. ; 40:7, s. 2179-2192
-
Tidskriftsartikel (refereegranskat)abstract
- Millimeter wave (mmWave) signals are useful for simultaneous localization and mapping (SLAM), due to their inherent geometric connection to the propagation environment and the propagation channel. To solve the SLAM problem, existing approaches rely on sigma-point or particle-based approximations, leading to high computational complexity, precluding real-time execution. We propose a novel low-complexity SLAM filter, based on the Poisson multi-Bernoulli mixture (PMBM) filter. It utilizes the extended Kalman (EK) first-order Taylor series based Gaussian approximation of the filtering distribution, and applies the track-oriented marginal multi-Bernoulli/Poisson (TOMB/P) algorithm to approximate the resulting PMBM as a Poisson multi-Bernoulli (PMB). The filter can account for different landmark types in radio SLAM and multiple data association hypotheses. Hence, it has an adjustable complexity/performance trade-off. Simulation results show that the developed SLAM filter can greatly reduce the computational cost, while it keeps the good performance of mapping and user state estimation.
|
|
| 4. |
- Ge, Yu, 1995, et al.
(författare)
-
Experimental Validation of Single BS 5G mmWave Positioning and Mapping for Intelligent Transport
- 2024
-
Ingår i: IEEE Transactions on Vehicular Technology. - 0018-9545 .- 1939-9359. ; In Press
-
Tidskriftsartikel (refereegranskat)abstract
- Positioning with 5G signals generally requires connection to several base stations (BSs), which makes positioning more demanding in terms of infrastructure than communications. To address this issue, there have been several theoretical studies on single BS positioning, leveraging high-resolution angle and delay estimation and multipath exploitation possibilities at mmWave frequencies. This paper presents the first realistic experimental validation of such studies, involving a commercial 5G mmWave BS with a customized beam sweep procedure and a user equipment (UE) development kit mounted on a test vehicle. We present the relevant signal models, and signal processing methods, and validate these based on data collected in an outdoor science park environment. Our results indicate that positioning is possible, but the performance is limited by the knowledge of the position and orientation of the infrastructure and the multipath visibility and diversity
|
|
| 5. |
- Kim, Hyowon, 1987, et al.
(författare)
-
Cooperative mmWave PHD-SLAM with Moving Scatterers
- 2022
-
Ingår i: 2022 25th International Conference on Information Fusion, FUSION 2022.
-
Konferensbidrag (refereegranskat)abstract
- Simultaneous localization and mapping (SLAM) using multipath at mmWave frequencies can provide accurate localization in the presence of static landmarks. When radio signals reflected from moving vehicle scatterers (VSs) are observed, the standard SLAM filters exhibit a degraded performance. To address this problem, we propose a probability hypothesis density (PHD)-based SLAM filter, where separate maps are maintained for VS and other types of landmarks. Through a combination of developed (i) local PHD-SLAM and (ii) global map fusion, we demonstrate that the proposed filter can handle the problem.
|
|
| 6. |
- Bartoletti, Stefania, et al.
(författare)
-
Introduction and fundamentals
- 2024
-
Ingår i: Positioning and Location-based Analytics in 5G and Beyond. - 9781119911463 ; , s. 1-18
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter introduces the book and presents the main principles and fundamentals for positioning and location-based analytics, thus effectively providing the basis for the following chapters. After a brief introduction and motivation for the book, we present the main use cases, verticals, and applications for positioning and location-based analytics. Then, we provide the technical fundamentals for understanding positioning and navigation algorithms, as well as location-based analytics. An introduction to the architectural principles is presented. Finally, an outline of the book chapters is provided.
|
|
| 7. |
- Bartoletti, Stefania, et al.
(författare)
-
Positioning methods
- 2024
-
Ingår i: Positioning and Location-based Analytics in 5G and Beyond. - 9781119911463 ; , s. 21-50
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter introduces the main positioning methods, starting from the state-of-the-art and following a statistical estimation perspective. This is followed by an in-depth treatment of radio positioning, first focusing on device-based positioning and then on device-free positioning. Finally, recent approaches based on artificial intelligence methods for positioning are detailed.
|
|
| 8. |
- Chen, Hui, et al.
(författare)
-
Doppler-Enabled Single-Antenna Localization and Mapping Without Synchronization
- 2022
-
Ingår i: 2022 IEEE Global Communications Conference (GLOBECOM). - Piscataway : IEEE. - 9781665435406 ; , s. 6469-6474
-
Konferensbidrag (refereegranskat)abstract
- Radio localization is a key enabler for joint communication and sensing in the fifth/sixth generation (SG/6G) communication systems. With the help of multipath components (MPCs), localization and mapping tasks can be done with a singlebase station (BS) and single unsynchronized user equipment (UE) if both of them are equipped with an antenna array. However, the antenna array at the UE side increases the hardware and computational cost, preventing localization functionality. In thiswork we show that with Doppler estimation and MPCs, localization and mapping tasks can be performed even with a single antenna mobile UE. Furthermore, we show that the localization and mapping performance will improve and then saturate ata certain level with an increased UE speed. Both theoretical Cramer-Rao bound analysis and simulation results show the potential of localization under mobility and the effectiveness of the proposed localization algorithm. © 2022 IEEE
|
|
| 9. |
- Ge, Yu, 1995, et al.
(författare)
-
5G SLAM Using the Clustering and Assignment Approach with Diffuse Multipath
- 2020
-
Ingår i: Sensors. - : MDPI AG. - 1424-8220. ; 20:16, s. 1-31
-
Tidskriftsartikel (refereegranskat)abstract
- 5G communication systems operating above 24 GHz have promising properties for user localization and environment mapping. Existing studies have either relied on simplified abstract models of the signal propagation and the measurements, or are based on direct positioning approaches, which directly map the received waveform to a position. In this study, we consider an intermediate approach, which consists of four phases-downlink data transmission, multi-dimensional channel estimation, channel parameter clustering, and simultaneous localization and mapping (SLAM) based on a novel likelihood function. This approach can decompose the problem into simpler steps, thus leading to lower complexity. At the same time, by considering an end-to-end processing chain, we are accounting for a wide variety of practical impairments. Simulation results demonstrate the efficacy of the proposed approach.
|
|
| 10. |
- Ge, Yu, 1995, et al.
(författare)
-
5G SLAM with Low-complexity Channel Estimation
- 2021
-
Ingår i: 15th European Conference on Antennas and Propagation, EuCAP 2021.
-
Konferensbidrag (refereegranskat)abstract
- 5G millimeter-wave signals are beneficial for simultaneous localization and mapping (SLAM), due to their inherent geometric connection to the propagation environment. Channel estimators can exploit received signals to estimate multipath components in terms of delays and angles, which can be used in localization and mapping. Thus, a good channel estimator is essential for 5G SLAM. This paper presents a novel low-complexity multidimensional ESPRIT-based channel estimator and applies it to a 5G SLAM framework. Simulation results demonstrate that the proposed channel estimator can accurately estimate channel information with low computational cost, with limited impact on mapping performance, compared to a tensor-ESPRIT benchmark.
|
|
| 11. |
- Ge, Yu, et al.
(författare)
-
A Computationally Efficient EK-PMBM Filter for Bistatic mmWave Radio SLAM
- 2022
-
Ingår i: IEEE Journal on Selected Areas in Communications. - Piscataway : IEEE. - 0733-8716 .- 1558-0008. ; 40:7, s. 2179-2192
-
Tidskriftsartikel (refereegranskat)abstract
- Millimeter wave (mmWave) signals are useful for simultaneous localization and mapping (SLAM), due to their inherent geometric connection to the propagation environment and the propagation channel. To solve the SLAM problem, existing approaches rely on sigma-point or particle-based approximations, leading to high computational complexity, precluding real-Time execution. We propose a novel low-complexity SLAM filter, based on the Poisson multi-Bernoulli mixture (PMBM) filter. It utilizes the extended Kalman (EK) first-order Taylor series based Gaussian approximation of the filtering distribution, and applies the track-oriented marginal multi-Bernoulli/Poisson (TOMB/P) algorithm to approximate the resulting PMBM as a Poisson multi-Bernoulli (PMB). The filter can account for different landmark types in radio SLAM and multiple data association hypotheses. Hence, it has an adjustable complexity/performance trade-off. Simulation results show that the developed SLAM filter can greatly reduce the computational cost, while it keeps the good performance of mapping and user state estimation. © 1983-2012 IEEE.
|
|
| 12. |
- Ge, Yu, 1995, et al.
(författare)
-
Doppler Exploitation in Bistatic mmWave Radio SLAM
- 2022
-
Ingår i: GLOBECOM - IEEE Global Telecommunications Conference. ; , s. 6463-6468
-
Konferensbidrag (refereegranskat)abstract
- Networks in 5G and beyond utilize millimeter wave (mmWave) radio signals, large bandwidths, and large antenna arrays, which bring opportunities in jointly localizing the user equipment and mapping the propagation environment, termed as simultaneous localization and mapping (SLAM). Existing approaches mainly rely on delays and angles, and ignore the Doppler, although it contains geometric information. In this paper, we study the benefits of exploiting Doppler in SLAM through deriving the posterior Cram´er-Rao bounds (PCRBs) and formulating the extended Kalman-Poisson multi-Bernoulli sequential filtering solution with Doppler as one of the involved measurements. Both theoretical PCRB analysis and simulation results demonstrate the efficacy of utilizing Doppler.
|
|
| 13. |
- Ge, Yu, et al.
(författare)
-
Doppler Exploitation in Bistatic mmWave Radio SLAM
- 2022
-
Ingår i: 2022 IEEE Global Communications Conference (GLOBECOM). - Piscataway : IEEE. - 9781665435406 ; , s. 6463-6468
-
Konferensbidrag (refereegranskat)abstract
- Networks in 5G and beyond utilize millimeter wave (mmWave) radio signals, large bandwidths, and large antenna arrays, which bring opportunities in jointly localizing the user equipment and mapping the propagation environment, termed as simultaneous localization and mapping (SLAM). Existing approaches mainly rely on delays and angles, and ignore the Doppler, although it contains geometric information. In this paper, we study the benefits of exploiting Doppler in SLAM through deriving the posterior Cramér-Rao bounds (PCRBs) and formulating the extended Kalman-Poisson multi-Bernoulli sequential filtering solution with Doppler as one of the involved measurements. Both theoretical PCRB analysis and simulation results demonstrate the efficacy of utilizing Doppler. © 2022 IEEE
|
|
| 14. |
- Ge, Yu, 1995, et al.
(författare)
-
Experimental Validation of Single Base Station 5G mm Wave Positioning: Initial Findings
- 2022
-
Ingår i: 2022 25th International Conference on Information Fusion, FUSION 2022. - Piscataway : IEEE.
-
Konferensbidrag (refereegranskat)abstract
- 5G cellular networks can utilize millimeter wave signals, and support large bandwidths and large antenna arrays, which provide more geometric-based signals and higher delay and angle resolutions. These merits bring new opportunities in positioning the user with limited infrastructure through the use of combined angle and delay information. However, there are many practical challenges to overcome, in order to have a functioning single base station 5G mmWave positioning system. In this paper, we describe a deployed single base station mmWave positioning system, and provide an example of the measurement data. Furthermore, we perform measurement validation on a limited measurement data set by performing base station localization. Additional evaluations performed on simulation model data provide guidelines on the required size of the data set and receiver antenna configuration, which will be implemented in upcoming measurements.
|
|
| 15. |
- Ge, Yu, 1995, et al.
(författare)
-
Iterated Posterior Linearization PMB Filter for 5G SLAM
- 2022
-
Ingår i: IEEE International Conference on Communications. - 1550-3607. ; 2022-May, s. 877-882
-
Konferensbidrag (refereegranskat)abstract
- 5G millimeter wave (mmWave) signals have inherent geometric connections to the propagation channel and the propagation environment. Thus, they can be used to jointly localize the receiver and map the propagation environment, which is termed as simultaneous localization and mapping (SLAM). One of the most important tasks in the 5G SLAM is to deal with the nonlinearity of the measurement model. To solve this problem, existing 5G SLAM approaches rely on sigma-point or extended Kalman filters, linearizing the measurement function with respect to the prior probability density function (PDF). In this paper, we study the linearization of the measurement function with respect to the posterior PDF, and implement the iterated posterior linearization filter into the Poisson multi-Bernoulli SLAM filter. Simulation results demonstrate the accuracy and precision improvements of the resulting SLAM filter.
|
|
| 16. |
- Gong, Zijun, et al.
(författare)
-
A Machine Learning-Based Approach for Auto-Detection and Localization of Targets in Underwater Acoustic Array Networks
- 2020
-
Ingår i: IEEE Transactions on Vehicular Technology. - 0018-9545 .- 1939-9359. ; 69:12, s. 15857-15866
-
Tidskriftsartikel (refereegranskat)abstract
- The localization and tracking of underwater objects have many applications. In a proactive underwater sensor array, some nodes will periodically broadcast linear frequency modulated (LFM) signals, which will hit the targets, get reflected and received by the other nodes. Depending on the target's position and velocity, the received signals will also be LFM signals of different frequencies and frequency rates. We can use the Fractional Fourier Transform (FrFT) to analyze the received signal's spectrum and find the peak. Based on the location of the peak, the target's distance and radial velocity can be estimated. However, the accuracy is highly dependent on the sampling interval of the spectrum. Smaller sampling interval leads to higher accuracy but also induces considerable complexity. To overcome this issue, we propose a machine learning-based approach to automatically detect the existence of the target, and roughly estimate the peak's location if targets exist. Then over-sampling can be conducted for a small area around the peak, leading to improved accuracy and reduced complexity. The idea is based on the following observation: if a target exists, we will be able to observe an "X" pattern on the spectrum. Extensive simulations are conducted to verify the effectiveness of the proposed architecture.
|
|
| 17. |
- Gong, Zijun, et al.
(författare)
-
Data-Aided Doppler Compensation for High-Speed Railway Communications over mmWave Bands
- 2021
-
Ingår i: IEEE Transactions on Wireless Communications. - 1558-2248 .- 1536-1276. ; 20:1, s. 520-534
-
Tidskriftsartikel (refereegranskat)abstract
- IEEE Millimeter wave communications show great potentials in many applications, one of which is the high-speed railway (HSR) communication system. However, a major challenge is the Doppler effect caused by the relative-movement between the train and the base station (BS), which leads to fast channel variation. To compensate for the Doppler shift, an accurate channel model is indispensable, and the far-field channel model is generally employed, which assumes that the dimensions of the antenna arrays are negligible compared to the distance between transmitter and receiver. This model is widely used in Cellular systems, but the underlining assumption is not always true for railway communication systems. In this paper, the modeling of the Doppler effect for millimeter wave in HSR communications is conducted, and data-aided Doppler estimation and compensation algorithms are designed based on the new model. We show that the conventional far-field channel model is based on the first-order Taylor expansion of the actually channel, and the second-order component cannot be ignored for HSR communications. Extensive simulations are conducted to verify the validity of the new model and the effectiveness of the proposed algorithms.
|
|
| 18. |
- Gong, Zijun, et al.
(författare)
-
Simultaneous Localization and Communications With Massive MIMO-OTFS
- 2023
-
Ingår i: IEEE Journal on Selected Areas in Communications. - Piscataway, NJ : IEEE. - 0733-8716 .- 1558-0008. ; 41:12, s. 3908-3924
-
Tidskriftsartikel (refereegranskat)abstract
- Next generation cellular network is expected to provide the simultaneous high-accuracy localization and ultra-reliable communication services, even in high mobility scenarios. To that end, the novel orthogonal time frequency space (OTFS) modulation has been developed as a promising physical-layer transmission technique, evident by the outstanding performance in terms of robustness against time-frequency selective fading over the orthogonal frequency division multiplexing (OFDM) counterpart. However, when OTFS meets massive multiple-input multiple-output (MIMO), the specific conditions, under which the delay-Doppler (DD) domain channel model holds, are not identified. In addition, the channel estimation and localization performance in such system is rarely studied. In this work, we target at these new challenges, and conduct comprehensive modelling, performance analysis, and algorithm design for massive MIMO-OTFS based simultaneous localization and communications. Specifically, we derive new channel models for the massive MIMO-OTFS system, which captures both time-frequency dispersion and spatial wideband effects. The specific conditions, under which the new models hold has been unveiled as well. Based on the new models, we establish the theoretical foundations for channel estimation and localization, by deriving the Cramer-Rao lower bounds of channel parameter and location estimation errors. Such bounds have been achieved with the newly designed low-complexity channel estimation and localization algorithms. Numerical simulations of the proposed framework with prevailing pulse functions are also conducted and the results validate the proposed designs and analysis. © 1983-2012 IEEE.
|
|
| 19. |
- Gong, Zijun, et al.
(författare)
-
Smart AUV-Assisted Localization and Time Synchronization of Underwater Acoustic Devices
- 2022
-
Ingår i: Smart Ships. - Boca Raton : CRC Press. - 9781003025924 ; , s. 133-168
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The localization and time synchronization of Underwater Acoustic Devices (UADs) have many potential applications in industry and scientific research. This can be done by deploying location-aware fixed anchors on the sea surface or bottom. However, this solution has poor accuracy and induces huge costs. In recent years, with the surge of Autonomous Underwater Vehicles (AUVs), the possibility of employing smart AUVs as mobile anchors have been extensively discussed. In this chapter, three smart AUV-assisted underwater localization and time synchronization techniques will be introduced, based on ToA (Time of Arrival), Doppler shift, and linear frequency modulated signals. The system model will be presented in detail, and the corresponding algorithms will be briefly discussed. For each of them, some preliminary numerical evaluations are conducted to directly show their performance.
|
|
| 20. |
- He, Jiguang, et al.
(författare)
-
Beyond 5G RIS mmWave Systems : Where Communication and Localization Meet
- 2022
-
Ingår i: IEEE Access. - Piscataway : IEEE. - 2169-3536. ; 10, s. 68075-68084
-
Tidskriftsartikel (refereegranskat)abstract
- Upcoming beyond fifth generation (5G) communications systems aim at further enhancing key performance indicators and fully supporting brand-new use cases by embracing emerging techniques, e.g., reconfigurable intelligent surface (RIS), integrated communication, localization, and sensing, and mmWave/THz communications. The wireless intelligence empowered by state-of-the-art artificial intelligence techniques has been widely considered at the transceivers, and now the paradigm is deemed to be shifted to the smart control of radio propagation environment by virtue of RISs. In this paper, we argue that to harness the full potential of RISs, localization and communication must be tightly coupled. This is in sharp contrast to 5G and earlier generations, where localization was a minor additional service. To support this, we first introduce the fundamentals of RIS mmWave channel modeling, followed by RIS channel state information acquisition and link establishment. Then, we deal with the connection between localization and communications, from a separate and joint perspective. © 2013 IEEE
|
|
| 21. |
- He, Jiguang, et al.
(författare)
-
Beyond 5G RIS mmWave Systems: Where Communication and Localization Meet
- 2022
-
Ingår i: IEEE Access. - 2169-3536 .- 2169-3536. ; 10, s. 68075-68084
-
Tidskriftsartikel (refereegranskat)abstract
- Upcoming beyond fifth generation (5G) communications systems aim at further enhancing key performance indicators and fully supporting brand-new use cases by embracing emerging techniques, e.g., reconfigurable intelligent surface (RIS), integrated communication, localization, and sensing, and mmWave/THz communications. The wireless intelligence empowered by state-of-the-art artificial intelligence techniques has been widely considered at the transceivers, and now the paradigm is deemed to be shifted to the smart control of radio propagation environment by virtue of RISs. In this paper, we argue that to harness the full potential of RISs, localization and communication must be tightly coupled. This is in sharp contrast to 5G and earlier generations, where localization was a minor additional service. To support this, we first introduce the fundamentals of RIS mmWave channel modeling, followed by RIS channel state information acquisition and link establishment. Then, we deal with the connection between localization and communications, from a separate and joint perspective.
|
|
| 22. |
- Jiang, Fan, 1987, et al.
(författare)
-
High-dimensional Channel Estimation for Simultaneous Localization and Communications
- 2021
-
Ingår i: IEEE Wireless Communications and Networking Conference, WCNC. - 1525-3511. - 9781728195056 ; 2021-March
-
Konferensbidrag (refereegranskat)abstract
- Simultaneous localization and communication (SLAC) is a desirable feature of 5G and beyond 5G wireless networks. To be able to implement SLAC, efficient high dimensional channel estimation methods are critical. This work presents a low-complexity multidimensional channel parameter estimation via rotational invariance techniques (MD-ESPRIT). We use both the spatial smoothing and forward-backward averaging techniques to further explore data samples to extract multipath components (MPCs). We propose a one-dimensional Fast-Fourier-Transform- (FFT) and inverse-FFT-based approach to obtain the signal subspaces for angular frequency estimation. The geometry relationship between MPCs and positions is utilized for simultaneous positioning and mapping. Numerical results demonstrate the improved identifiability and low complexity performance of the proposed scheme.
|
|
| 23. |
- Jiang, Fan, 1987-, et al.
(författare)
-
Low-complexity Channel Estimation and Localization with Random Beamspace Observations
- 2023
-
Ingår i: ICC 2023 - IEEE International Conference on Communications. - Piscataway, NJ : IEEE. - 9781538674628 ; 2023-May, s. 5985-5990
-
Konferensbidrag (refereegranskat)abstract
- We investigate the problem of low-complexity, high-dimensional channel estimation with beamspace observations, for the purpose of localization. Existing work on beamspace ESPRIT (estimation of signal parameters via rotational invariance technique) approaches requires either a shift-invariance structure of the transformation matrix, or a full-column rank condition. We extend these beamspace ESPRIT methods to a case when neither of these conditions is satisfied, by exploiting the full-row rank of the transformation matrix. We first develop a tensor decomposition-based approach, and further design a matrix-based ESPRIT method to achieve auto-pairing of the channel parameters, with reduced complexity. Numerical simulations show that the proposed methods work in the challenging scenario, and the matrix-based ESPRIT approach achieves better performance than the tensor ESPRIT method. © 2023 IEEE
|
|
| 24. |
- Jiang, Fan, 1987-, et al.
(författare)
-
Two-Timescale Transmission Design and RIS Optimization for Integrated Localization and Communications
- 2023
-
Ingår i: IEEE Transactions on Wireless Communications. - Piscataway : IEEE. - 1536-1276 .- 1558-2248. ; 22:12, s. 8587-8602
-
Tidskriftsartikel (refereegranskat)abstract
- Reconfigurable intelligent surfaces (RISs) have tremendous potential to boost communication performance, especially when the line-of-sight (LOS) path between the user equipment (UE) and base station (BS) is blocked. To control the RIS, channel state information (CSI) is needed, which entails significant pilot overhead. To reduce this overhead and the need for frequent RIS reconfiguration, we propose a novel framework for integrated localization and communications, where RIS configurations are fixed during location coherence intervals, while BS precoders are optimized every channel coherence interval. This framework leverages accurate location information obtained with the aid of several RISs as well as novel RIS optimization and channel estimation methods. Performance in terms of localization accuracy, channel estimation error, and achievable rate demonstrates the effectiveness of the proposed approach. © 2023 IEEE.
|
|
| 25. |
- Jiang, Fan, 1987, et al.
(författare)
-
Two-Timescale Transmission Design and RIS Optimization for Integrated Localization and Communications
- 2023
-
Ingår i: IEEE Transactions on Wireless Communications. - 1558-2248 .- 1536-1276. ; 22:12, s. 8587-8602
-
Tidskriftsartikel (refereegranskat)abstract
- Reconfigurable intelligent surfaces (RISs) have tremendous potential to boost communication performance, especially when the line-of-sight (LOS) path between the user equipment (UE) and base station (BS) is blocked. To control the RIS, channel state information (CSI) is needed, which entails significant pilot overhead. To reduce this overhead and the need for frequent RIS reconfiguration, we propose a novel framework for integrated localization and communications, where RIS configurations are fixed during location coherence intervals, while BS precoders are optimized every channel coherence interval. This framework leverages accurate location information obtained with the aid of several RISs as well as novel RIS optimization and channel estimation methods. Performance in terms of localization accuracy, channel estimation error, and achievable rate demonstrates the effectiveness of the proposed approach.
|
|
| 26. |
- Keskin, Furkan, 1988, et al.
(författare)
-
Optimal Spatial Signal Design for mmWave Positioning under Imperfect Synchronization
- 2022
-
Ingår i: IEEE Transactions on Vehicular Technology. - 0018-9545 .- 1939-9359. ; 71:5, s. 5558-5563
-
Tidskriftsartikel (refereegranskat)abstract
- We consider the problem of spatial signal design for multipath-assisted mmWave positioning under limited prior knowledge on the users location and clock bias. We propose an optimal robust design and, based on the low-dimensional precoder structure under perfect prior knowledge, a codebook-based heuristic design with optimized beam power allocation. Through numerical results, we characterize different position-error-bound (PEB) regimes with respect to clock bias uncertainty and show that the proposed low-complexity codebook-based designs outperform the conventional directional beam codebook and achieve near-optimal PEB performance for both analog and digital architectures.
|
|
| 27. |
- Keskin, Musa Furkan, et al.
(författare)
-
ESPRIT-Oriented Precoder Design for mmWave Channel Estimation
- 2023
-
Ingår i: 2023 IEEE International Conference on Communications Workshops (ICC Workshops). - : IEEE. - 9798350333077 - 9798350333084 ; , s. 903-908
-
Konferensbidrag (refereegranskat)abstract
- We consider the problem of ESPRIT-oriented precoder design for beamspace angle-of-departure (AoD) estimation in downlink mmWave multiple-input single-output communications. Standard precoders (i.e., directional/sum beams) yield poor performance in AoD estimation, while Cramer-Rao bound-optimized precoders undermine the so-called shift invariance property (SIP) of ESPRIT. To tackle this issue, the problem of designing ESPRIT-oriented precoders is formulated to jointly optimize over the precoding matrix and the SIP-restoring matrix of ESPRIT. We develop an alternating optimization approach that updates these two matrices under unit-modulus constraints for analog beamforming architectures. Simulation results demonstrate the validity of the proposed approach while providing valuable insights on the beampatterns of the ESPRIT-oriented precoders. © 2023 IEEE.
|
|
| 28. |
- Keskin, Musa Furkan, 1988, et al.
(författare)
-
ESPRIT-Oriented Precoder Design for mmWave Channel Estimation
- 2023
-
Ingår i: 2023 IEEE International Conference on Communications Workshops: Sustainable Communications for Renaissance, ICC Workshops 2023. ; , s. 903-908
-
Konferensbidrag (refereegranskat)abstract
- We consider the problem of ESPRIT-oriented precoder design for beamspace angle-of-departure (AoD) estimation in downlink mmWave multiple-input single-output communications. Standard precoders (i.e., directional/sum beams) yield poor performance in AoD estimation, while Cramer-Rao bound-optimized precoders undermine the so-called shift invariance property (SIP) of ESPRIT. To tackle this issue, the problem of designing ESPRIT-oriented precoders is formulated to jointly optimize over the precoding matrix and the SIP-restoring matrix of ESPRIT. We develop an alternating optimization approach that updates these two matrices under unit-modulus constraints for analog beamforming architectures. Simulation results demonstrate the validity of the proposed approach while providing valuable insights on the beampatterns of the ESPRIT-oriented precoders.
|
|
| 29. |
- Keskin, Musa Furkan, et al.
(författare)
-
Optimal Spatial Signal Design for mmWave Positioning Under Imperfect Synchronization
- 2022
-
Ingår i: IEEE Transactions on Vehicular Technology. - Piscataway : IEEE. - 0018-9545 .- 1939-9359. ; 71:5, s. 5558-5563
-
Tidskriftsartikel (refereegranskat)abstract
- We consider the problem of spatial signal design for multipath-assisted mmWave positioning under limited prior knowledge on the user's location and clock bias. We propose an optimal robust design and, based on the low-dimensional precoder structure under perfect prior knowledge, a codebook-based heuristic design with optimized beam power allocation. Through numerical results, we characterize different position-error-bound (PEB) regimes with respect to clock bias uncertainty and show that the proposed low-complexity codebook-based designs outperform the conventional directional beam codebook and achieve near-optimal PEB performance for both analog and digital architectures. © 1967-2012 IEEE
|
|
| 30. |
- Li, Zhixing, et al.
(författare)
-
An Iterative 5G Positioning and Synchronization Algorithm in NLOS Environments with Multi-Bounce Paths
- 2023
-
Ingår i: IEEE Wireless Communications Letters. - 2162-2345 .- 2162-2337. ; 12:5, s. 804-808
-
Tidskriftsartikel (refereegranskat)abstract
- 5G positioning is a very promising area that presents many opportunities and challenges. Many existing techniques rely on multiple anchor nodes and line-of-sight (LOS) paths, or single reference node and single-bounce non-LOS (NLOS) paths. However, in dense multipath environments, identifying the LOS or single-bounce assumptions is challenging. The multi-bounce paths will make the positioning accuracy deteriorate significantly. We propose a robust 5G positioning algorithm in NLOS multipath environments to mitigate the effects of multi-bounce paths.
|
|
| 31. |
- Li, Zhixing, et al.
(författare)
-
An Iterative 5G Positioning and Synchronization Algorithm in NLOS Environments with Multi-Bounce Paths
- 2023
-
Ingår i: IEEE Wireless Communications Letters. - Piscataway : IEEE. - 2162-2337 .- 2162-2345. ; 12:5, s. 804-808
-
Tidskriftsartikel (refereegranskat)abstract
- 5G positioning is a very promising area that presents many opportunities and challenges. Many existing techniques rely on multiple anchor nodes and line-of-sight (LOS) paths, or single reference node and single-bounce non-LOS (NLOS) paths. However, in dense multipath environments, identifying the LOS or single-bounce assumptions is challenging. The multi-bounce paths will make the positioning accuracy deteriorate significantly. We propose a robust 5G positioning algorithm in NLOS multipath environments to mitigate the effects of multi-bounce paths. © 2023 IEEE.
|
|
| 32. |
- Qiang, Xiaoyu, et al.
(författare)
-
Hybrid precoding for Integrated Communications and Localization in Massive MIMO LEO Satellite Systems
- 2023
-
Ingår i: ICC 2023 - IEEE International Conference on Communications. - Piscataway, NJ : IEEE. - 9781538674628 ; 2023-May, s. 3540-3545
-
Konferensbidrag (refereegranskat)abstract
- The future sixth generation (6G) networks will feature great importance on the integration of communications and localization, to realize the Internet of Everything (IoE). In this paper, we investigate the hybrid precoding design for the integrated communications and localization (ICAL) in the massive multiple-input multiple-output (MIMO) low Earth orbit (LEO) systems. In particular, we first derive an upper bound of the communication spectral efficiency (SE) and the squared position error bound (SPEB) of localization. Then, we formulate a multi-objective optimization problem to simultaneously operate communications and localization. Simulation results demonstrate the satisfactory performance of the proposed massive MIMO LEO ICAL system for typical setups. © 2023 IEEE.
|
|
| 33. |
- Su, Ruoyu, et al.
(författare)
-
A Mobile Node Assisted Localization System for Wireless Sensor Networks
- 2021
-
Ingår i: IWCMC 2021: 2021 17TH INTERNATIONAL WIRELESS COMMUNICATIONS & MOBILE COMPUTING CONFERENCE (IWCMC). - 2376-6492. - 9781728186160 ; , s. 1716-1720
-
Konferensbidrag (refereegranskat)abstract
- Wireless sensor network (WSN), consisting of several sensor nodes, is one of the most promising technologies emerged in the past decade. The positioning system for WSN is particularly meaningful and widely used in the military surveillance, air-sea rescue, traffic monitoring, and etc. However, the traditional positioning system always suffers from deployment and maintenance of anchors. In this paper, we propose a positioning system employing a Raspberry Pi platform attached to a DJI drone as a mobile anchor. The DJI drone can serve as multiple virtual anchors by moving and broadcasting its location information periodically. Thus, it is possible to localize sensor node by itself when the sensor node collects the drone's position. A Gauss-Newton method is applied to improve the accuracy of the proposed positioning system. We also elaborate the adaption of the Gauss-Newton method with the geodetic coordinates. The goal of the proposed positioning system is to achieve higher accuracy and higher coverage at lower cost.
|
|
| 34. |
- Su, Ruoyu, et al.
(författare)
-
Analysis of Outage Probability for Millimeter Wave Communications
- 2021
-
Ingår i: IWCMC 2021: 2021 17TH INTERNATIONAL WIRELESS COMMUNICATIONS & MOBILE COMPUTING CONFERENCE (IWCMC). - 2376-6492. - 9781728186160 ; , s. 2194-2198
-
Konferensbidrag (refereegranskat)abstract
- As the data traffic in future wireless communications will explosively grow up to 1000-fold by the deployment of 5G, several technologies are emerging to satisfy this demand, including multiple-input multiple-output (MIMO), millimeter wave communications, Non-orthogonal Multiple Access (NOMA), etc. Millimeter wave communication is a promising solution since it can provide tens of GHz bandwidth by fundamentally exploring higher unoccupied spectrum resources. As the wavelength of higher frequency shrinks, it is possible to design more compact antenna array with large number of antennas with independent RF (Radio Frequency) chains, causing high cost and complexity. By exploring the spatial sparsity of the millimeter wave channels, lens antenna array has been investigated recently as a promising choice with limited RF chains and low complexity. In this paper, we investigate the outage probability for highway communication systems with lens antenna array, under overtaking scenario, where high mobility of users is expected. When a vehicle is trying to pass another one, the channels between these two vehicles and the RSU (Road Side Unit) are unresolvable, thus causing outage for at least tens of symbol durations. We apply power-domain NOMA in this scenario, where these two users are paired by a threshold derived with the QoS of each user, to alleviate this problem and achieve low outage probability.
|
|
| 35. |
- Weng, Shudi, et al.
(författare)
-
Wideband mmWave Massive MIMO Channel Estimation and Localization
- 2023
-
Ingår i: IEEE Wireless Communications Letters. - Piscataway : IEEE. - 2162-2337 .- 2162-2345. ; 12:8, s. 1314-1318
-
Tidskriftsartikel (refereegranskat)abstract
- Spatial wideband effects are known to affect channel estimation and localization performance in millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems. Based on perturbation analysis, we show that the spatial wideband effect is in fact more pronounced than previously thought and could significantly degrade performance if not properly considered in the algorithm design, even at moderate bandwidths. We propose a novel channel estimation method based on multidimensional ESPRIT algorithms per subcarrier, combined with unsupervised learning for pairing across subcarriers, which shows significant performance gain over existing schemes under wideband conditions. © 2023 IEEE
|
|
| 36. |
- Weng, Shudi, et al.
(författare)
-
Wideband mmWave Massive MIMO Channel Estimation and Localization
- 2023
-
Ingår i: IEEE Wireless Communications Letters. - 2162-2345 .- 2162-2337. ; 12:8, s. 1314-1318
-
Tidskriftsartikel (refereegranskat)abstract
- Spatial wideband effects are known to affect channel estimation and localization performance in millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems. Based on perturbation analysis, we show that the spatial wideband effect is in fact more pronounced than previously thought and could significantly degrade performance if not properly considered in the algorithm design, even at moderate bandwidths. We propose a novel channel estimation method based on multidimensional ESPRIT algorithms per subcarrier, combined with unsupervised learning for pairing across subcarriers, which shows significant performance gain over existing schemes under wideband conditions.
|
|
| 37. |
- Widmer, Joerg, et al.
(författare)
-
Enablers toward 6G positioning and sensing
- 2024
-
Ingår i: Positioning and Location-based Analytics in 5G and Beyond. - 9781119911463 ; , s. 75-97
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter provides the reader with an overview of three major trends toward 6G, namely integrated sensing and communication, the ability to control radio wave propagation in the environment thanks to reconfigurable intelligent surfaces, and advances in model-based and model-free signal processing. This list of trends is by no means exhaustive, but only aims to highlight the tremendous potential for research and innovation toward 6G positioning.
|
|
| 38. |
- You, Li, et al.
(författare)
-
Integrated Communications and Localization for Massive MIMO LEO Satellite Systems
- 2024
-
Ingår i: IEEE Transactions on Wireless Communications. - 1558-2248 .- 1536-1276. ; In Press
-
Tidskriftsartikel (refereegranskat)abstract
- Integrated communications and localization (ICAL) will play an important part in future sixth generation (6G) networks for the realization of Internet of Everything (IoE) to support both global communications and seamless localization. Massive multiple-input multiple-output (MIMO) low earth orbit (LEO) satellite systems have great potential in providing wide coverage with enhanced gains, and thus are strong candidates for realizing ubiquitous ICAL. In this paper, we develop a wideband massive MIMO LEO satellite system to simultaneously support wireless communications and localization operations in the downlink. In particular, we first characterize the signal propagation properties and derive a localization performance bound. Based on these analyses, we focus on the hybrid analog/digital precoding design to achieve high communication capability and localization precision. Numerical results demonstrate that the proposed ICAL scheme supports both the wireless communication and localization operations for typical system setups.
|
|
