no code implementations • 26 Mar 2024 • Liang Liu, Shuowen Zhang, Shuguang Cui
A key challenge of 6G-oriented ISAC lies in how to perform ubiquitous sensing based on the communication signals and devices.
no code implementations • 20 Dec 2023 • Xianzhen Guo, Qin Shi, Liang Liu, Shuowen Zhang
However, in practice, the number of BSs possessing LOS paths to a target can be small, leading to marginal networked sensing gain.
no code implementations • 6 Sep 2023 • QiPeng Wang, Liang Liu, Shuowen Zhang
In this paper, we consider a more challenging AOA estimation setup in the intelligent reflecting surface (IRS) assisted integrated sensing and communication (ISAC) system, where LOS paths do not exist between the BS and the users, while the users' signals can be transmitted to the BS merely via their LOS paths to the IRS as well as the LOS path from the IRS to the BS.
no code implementations • 4 Aug 2023 • Rui Wang, Zhaorui Wang, Liang Liu, Shuowen Zhang, Shi Jin
Different from the uplink counterpart where the BS possesses the pilot signals containing the CSI of all the users, in downlink communication, the distributed users merely receive the pilot signals containing their own CSI and cannot leverage the correlation in different users' channels revealed in [1].
no code implementations • 4 May 2023 • QiPeng Wang, Liang Liu, Shuowen Zhang, Boya Di, Francis C. M. Lau
In this paper, we show that the distance between a target and its associated IRS can be indirectly estimated based on the length of the BS-target-BS path and the BS-target-IRS-BS path.
no code implementations • 16 Feb 2023 • Qin Shi, Liang Liu, Shuowen Zhang
Recently, there is a growing interest in achieving integrated sensing and communication (ISAC) in the sixth-generation (6G) cellular network.
no code implementations • 1 Jun 2022 • Liang Liu, Shuowen Zhang, Rui Du, Tong Xiao Han, Shuguang Cui
This article will discuss about the possibility of exploiting the future sixth-generation (6G) cellular network to realize ISAC.
no code implementations • 25 May 2022 • QiPeng Wang, Liang Liu, Shuowen Zhang, Francis C. M. Lau
The classic trilateration technique can localize each target based on its distances to three anchors with known coordinates.
1 code implementation • 5 Jan 2022 • QiPeng Wang, Liang Liu, Shuowen Zhang, Francis C. M. Lau
In particular, we propose to leverage the temporal correlation in device activity, e. g., a device active in the previous coherence block is more likely to be still active in the current coherence block, to improve the detection and estimation performance.
no code implementations • 20 Aug 2021 • Qin Shi, Liang Liu, Shuowen Zhang, Shuguang Cui
A novel two-phase sensing framework is proposed to localize the passive targets that cannot transmit/receive reference signals to/from the base stations (BSs), where the ranges of the targets are estimated based on their reflected OFDM signals to the BSs in Phase I, and the location of each target is estimated based on its ranges to different BSs in Phase II.
no code implementations • 22 Jun 2021 • Rui Wang, Liang Liu, Shuowen Zhang, Changyuan Yu
Specifically, in Phase I, the correlation coefficients between the channels of a typical BS antenna and those of the other antennas are estimated; while in Phase II, the cascaded channel of the typical antenna is estimated.
1 code implementation • 27 Jan 2021 • QiPeng Wang, Liang Liu, Shuowen Zhang, Francis C. M. Lau
In particular, we propose to leverage the temporal correlation in user activity, i. e., a device active at the previous time slot is more likely to be still active at the current moment, to improve the detection performance.
Action Detection Activity Detection Information Theory Signal Processing Information Theory
no code implementations • 12 Nov 2020 • Liang Liu, Shuowen Zhang
Since the technologies of orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) are widely used in the legacy cellular systems, this paper proposes a two-stage signal processing approach for radar sensing in an MIMO-OFDM system, where the scattered channels caused by various targets are estimated in the first stage, and the location information of the targets is then extracted from their scattered channels in the second stage.
no code implementations • 1 Sep 2020 • Qin Tao, Shuowen Zhang, Caijun Zhong, Rui Zhang
For the proposed scheme, we first derive a closed-form approximation of the outage probability, based on which the optimal $Q$ with best outage performance can be efficiently obtained.
no code implementations • 6 Jul 2020 • Qingqing Wu, Shuowen Zhang, Beixiong Zheng, Changsheng You, Rui Zhang
Intelligent reflecting surface (IRS) is an enabling technology to engineer the radio signal prorogation in wireless networks.