no code implementations • 25 Mar 2024 • Tuo Wu, Cunhua Pan, Kangda Zhi, Hong Ren, Maged Elkashlan, Cheng-Xiang Wang, Robert Schober, Xiaohu You
Then our objective is to regain the information lost from the faulty elements and reconstruct the complete high-dimensional RIS information for localization.
no code implementations • 25 Mar 2024 • Tuo Wu, Cunhua Pan, Kangda Zhi, Hong Ren, Maged Elkashlan, Jiangzhou Wang
Then, we propose a transfer learning based fingerprint (TFBF) algorithm that employs the reconstructed high-dimensional RIS information for MU localization.
no code implementations • 17 Mar 2024 • Boshi Wang, Cunhua Pan, Hong Ren, Zhiyuan Yu, Yang Zhang, Mengyu Liu, Gui Zhou
Due to the signal amplification capability of active RISs, the mutual influence between active RISs, which is termed as the "inter-excitation" effect, cannot be ignored.
no code implementations • 4 Mar 2024 • Zhenkun Zhang, Hong Ren, Cunhua Pan, Sheng Hong, Dongming Wang, Jiangzhou Wang, Xiaohu You
Specifically, we propose a two-stage scheme for target localization, where communication signals are reused as sensing reference signals based on the system information shared at the central processing unit (CPU).
no code implementations • 21 Feb 2024 • Jiahua Wan, Hong Ren, Zhiyuan Yu, Zhenkun Zhang, Yang Zhang, Cunhua Pan, Jiangzhou Wang
To address the formulated non-convex problem, we propose an algorithm based on the block coordinate descent (BCD) method to decouple the original problem into two subproblems, where the computational and beamforming settings are optimized alternately.
no code implementations • 8 Feb 2024 • Yasheng Jin, Hong Ren, Cunhua Pan, Zhiyuan Yu, Ruisong Weng, Boshi Wang, Gui Zhou, Yongchao He, Maged Elkashlan
In this paper, we investigate an reconfigurable intelligent surface (RIS)-aided integrated sensing and communication (ISAC) system.
no code implementations • 7 Feb 2024 • Mengyu Liu, Hong Ren, Cunhua Pan, Boshi Wang, Zhiyuan Yu, Ruisong Weng, Kangda Zhi, Yongchao He
However, when radar and communication equipment coexist in the same system, i. e. radar-communication coexistence (RCC), the interference from communication systems to radar can be large and cannot be ignored.
no code implementations • 3 Feb 2024 • Yang Zhang, Hong Ren, Cunhua Pan, Boshi Wang, Zhiyuan Yu, Ruisong Weng, Tuo Wu, Yongchao He
This work considers a dual-functional radar and communication (DFRC) system with an active reconfigurable intelligent surface (RIS) and a potential eavesdropper.
no code implementations • 31 Mar 2023 • Kangda Zhi, Cunhua Pan, Hong Ren, Kok Keong Chai, Cheng-Xiang Wang, Robert Schober, Xiaohu You
Our analytical results indicate that a limited part of the XL-array receives the majority of the signal power in the near field, which leads to a notion of visibility region (VR) of a user.
no code implementations • 21 Mar 2023 • Qihao Peng, Hong Ren, Mianxiong Dong, Maged Elkashlan, Kai-Kit Wong, Lajos Hanzo
Specifically, to support multiple devices with limited pilot overhead, pilot reuse among the users is considered, where we formulate a joint pilot length and pilot allocation strategy for maximizing the number of devices admitted.
no code implementations • 21 Oct 2022 • Tuo Wu, Cunhua Pan, Yijin Pan, Hong Ren, Maged Elkashlan, Cheng-Xiang Wang
By using the STCRV as input, we propose a novel residual convolution network regression (RCNR) learning algorithm to output the estimated three-dimensional (3D) position of the MU.
no code implementations • 23 Aug 2022 • Zhendong Peng, Cunhua Pan, Gui Zhou, Hong Ren
In this paper, we propose a novel two-stage based uplink channel estimation strategy with reduced pilot overhead and error propagation for a reconfigurable intelligent surface (RIS)-aided multi-user (MU) millimeter wave (mmWave) system.
no code implementations • 18 Aug 2022 • Hong Ren, Zhenkun Zhang, Zhangjie Peng, Li Li, Cunhua Pan
Then, we investigate the general scenario in which the RF signals are radiated during the flight, aiming to minimize the total energy consumption of the UAV by jointly optimizing the UAV's trajectory, flight time and the RIS's reflection coefficients.
no code implementations • 16 Aug 2022 • Tuo Wu, Cunhua Pan, Yijin Pan, Sheng Hong, Hong Ren, Maged Elkashlan, Feng Shu, Jiangzhou Wang
Then, we derive a complex expression for the variance based on the derived PDF.
no code implementations • 16 Aug 2022 • Tuo Wu, Hong Ren, Cunhua Pan, Yijin Pan, Sheng Hong, Maged Elkashlan, Feng Shu, Jiangzhou Wang
Reconfigurable intelligent surface (RIS)-aided localization systems are increasingly recognized for enhancing accuracy in internet of things (IoT) networks.
no code implementations • 15 Aug 2022 • Zhendong Peng, Gui Zhou, Cunhua Pan, Hong Ren, A. Lee Swindlehurst, Petar Popovski, Gang Wu
Specifically, in Stage I, the channel state information (CSI) of a typical user is estimated.
no code implementations • 14 Dec 2021 • Kangda Zhi, Cunhua Pan, Hong Ren, Kok Keong Chai, Maged Elkashlan
This letter theoretically compares the active reconfigurable intelligent surface (RIS)-aided system with the passive RIS-aided system.
no code implementations • 11 Dec 2021 • Cunhua Pan, Gui Zhou, Kangda Zhi, Sheng Hong, Tuo Wu, Yijin Pan, Hong Ren, Marco Di Renzo, A. Lee Swindlehurst, Rui Zhang, Angela Yingjun Zhang
In the past as well as present wireless communication systems, the wireless propagation environment is regarded as an uncontrollable black box that impairs the received signal quality, and its negative impacts are compensated for by relying on the design of various sophisticated transmission/reception schemes.
no code implementations • 4 Dec 2021 • Zhangjie Peng, Tianshu Li, Cunhua Pan, Hong Ren, Jiangzhou Wang
In this letter, we investigate a reconfigurable intelligent surfaces (RIS)-aided device to device (D2D) communication system over Rician fading channels with imperfect hardware including both hardware impairment at the transceivers and phase noise at the RISs.
no code implementations • 28 Jun 2021 • Gui Zhou, Cunhua Pan, Hong Ren, Petar Popovski, A. Lee Swindlehurst
In the first coherence block, we propose a two-phase channel estimation method, in which the cascaded channel of one typical user is estimated in Phase I based on the linear correlation among cascaded paths, while the cascaded channels of other users are estimated in Phase II by utilizing the partial CSI of the common base station (BS)-RIS channel obtained in Phase I.
no code implementations • 23 Dec 2020 • Gui Zhou, Cunhua Pan, Hong Ren, Kezhi Wang, Zhangjie Peng
In this paper, we study the robust transmission design for a reconfigurable intelligent surface (RIS)-aided secure communication system in the presence of transceiver hardware impairments.
Information Theory Signal Processing Information Theory
no code implementations • 19 Nov 2020 • Sheng Hong, Cunhua Pan, Gui Zhou, Hong Ren, Kezhi Wang
In this paper, we investigate the robust outage constrained transmission design for an intelligent reflecting surface (IRS) aided secure communication system.
no code implementations • 9 Nov 2020 • Cunhua Pan, Hong Ren, Kezhi Wang, Jonas Florentin Kolb, Maged Elkashlan, Ming Chen, Marco Di Renzo, Yang Hao, Jiangzhou Wang, A. Lee Swindlehurst, Xiaohu You, Lajos Hanzo
Reconfigurable intelligent surfaces (RISs) or intelligent reflecting surfaces (IRSs), are regarded as one of the most promising and revolutionizing techniques for enhancing the spectrum and/or energy efficiency of wireless systems.
no code implementations • 26 Oct 2020 • Kangda Zhi, Cunhua Pan, Hong Ren, Kezhi Wang
We consider the Rician channel model and exploit the long-time statistical CSI to design the phase shifts of the RIS, while the maximum ratio combination (MRC) technique is applied for the active beamforming at the base station (BS) relying on the instantaneous CSI.
no code implementations • 21 Sep 2020 • Gui Zhou, Cunhua Pan, Hong Ren, Kezhi Wang, Maged Elkashlan, Marco Di Renzo
To enhance the robustness of hybrid analog-digital beamforming in the presence of random blockages, we formulate a stochastic optimization problem based on the minimization of the sum outage probability.
no code implementations • 2 Aug 2020 • Kangda Zhi, Cunhua Pan, Hong Ren, Kezhi Wang
In this paper, we derive the uplink achievable rate expression of intelligent reflecting surface (IRS)-aided millimeter-wave (mmWave) systems, taking into account the phase noise at IRS and the quantization error at base stations (BSs).
no code implementations • 22 Jul 2020 • Zhangjie Peng, Tianshu Li, Cunhua Pan, Hong Ren, Wei Xu, Marco Di Renzo
Simulation results verify the correctness of the obtained results and show that the proposed GA method has almost the same performance as the globally optimal solution.
no code implementations • 20 Jul 2020 • Hong Ren, Cunhua Pan, Kezhi Wang, Wei Xu, Maged Elkashlan, Arumugam Nallanathan
This letter considers an unmanned aerial vehicle (UAV)-enabled relay communication system for delivering latency-critical messages with ultra-high reliability, where the relay is operating under amplifier-and-forward (AF) mode.
no code implementations • 9 Jun 2020 • Gui Zhou, Cunhua Pan, Hong Ren, Kezhi Wang, Kok Keong Chai, Kai-Kit Wong
In this paper, intelligent reflecting surface (IRS) is proposed to enhance the physical layer security in the Rician fading channel where the angular direction of the eavesdropper is aligned with a legitimate user.
no code implementations • 24 Apr 2020 • Sheng Hong, Cunhua Pan, Hong Ren, Kezhi Wang, Kok Keong Chai, Arumugam Nallanathan
To minimize the transmit power, the beamforming vector at the transmitter, the AN covariance matrix, and the IRS phase shifts are jointly optimized subject to the outage rate probability constraints under the statistical cascaded channel state information (CSI) error model that usually models the channel estimation error.
no code implementations • 9 Apr 2020 • Lei Zhang, Cunhua Pan, Yu Wang, Hong Ren, Kezhi Wang
Simulation results verify the efficiency of the proposed algorithms and reveal the impacts of CSI uncertainties on ST's minimum transmit power and feasibility rate of the optimization problems.
no code implementations • 17 Feb 2020 • Sheng Hong, Cunhua Pan, Hong Ren, Kezhi Wang, Arumugam Nallanathan
To tackle it, we propose to utilize the block coordinate descent (BCD) algorithm to alternately update the TPC matrix, AN covariance matrix, and phase shifts while keeping SR non-decreasing.
no code implementations • 20 Jan 2020 • Gui Zhou, Cunhua Pan, Hong Ren, Kezhi Wang, Arumugam Nallanathan
Specifically, the transmit power minimization problems are formulated subject to the worst-case rate constraints under the bounded CSI error model and the rate outage probability constraints under the statistical CSI error model, respectively.
no code implementations • 14 Nov 2019 • Gui Zhou, Cunhua Pan, Hong Ren, Kezhi Wang, Marco Di Renzo, Arumugam Nallanathan
In this paper, we study the worst-case robust beamforming design for an IRS-aided multiuser multiple-input single-output (MU-MISO) system under the assumption of imperfect CSI.
no code implementations • 10 Sep 2019 • Gui Zhou, Cunhua Pan, Hong Ren, Kezhi Wang, Arumugam Nallanathan
We aim for maximizing the sum rate of all the multicasting groups by the joint optimization of the precoding matrix at the base station (BS) and the reflection coefficients at the IRS under both the power and unit-modulus constraint.