Search Results for author: Ya-Feng Liu

Found 11 papers, 0 papers with code

Sensing With Random Signals

no code implementations5 Sep 2023 Shihang Lu, Fan Liu, Fuwang Dong, Yifeng Xiong, Jie Xu, Ya-Feng Liu

Radar systems typically employ well-designed deterministic signals for target sensing.

Efficient Estimation of Sensor Biases for the 3-Dimensional Asynchronous Multi-Sensor System

no code implementations4 Sep 2021 Wenqiang Pu, Ya-Feng Liu, Zhi-Quan Luo

There are generally two difficulties in this bias estimation problem: one is the unknown target states which serve as the nuisance variables in the estimation problem, and the other is the highly nonlinear coordinate transformation between the local and global coordinate systems of the sensors.

Secure Dual-Functional Radar-Communication Transmission: Exploiting Interference for Resilience Against Target Eavesdropping

no code implementations10 Jul 2021 Nanchi Su, Fan Liu, Zhongxiang Wei, Ya-Feng Liu, Christos Masouros

We study security solutions for dual-functional radar communication (DFRC) systems, which detect the radar target and communicate with downlink cellular users in millimeter-wave (mmWave) wireless networks simultaneously.

Accelerating Coordinate Descent via Active Set Selection for Device Activity Detection for Multi-Cell Massive Random Access

no code implementations27 Apr 2021 Ziyue Wang, Ya-Feng Liu, Zhilin Chen, Wei Yu

Specifically, at each iteration, the proposed active set CD algorithm first selects a small subset of all devices, namely the active set, which contains a few devices that contribute the most to the deviation from the first-order optimality condition of the MLE problem thus potentially can provide the most improvement to the objective function, then applies the CD algorithm to perform the detection for the devices in the active set.

Action Detection Activity Detection +1

Antenna Efficiency in Massive MIMO Detection

no code implementations23 Apr 2021 Ruichen Jiang, Ya-Feng Liu

We propose a new performance metric, called antenna efficiency, to characterize how fast the vector error probability (VEP) decreases as the number of receive antennas increases in the large system limit.

An Efficient Active Set Algorithm for Covariance Based Joint Data and Activity Detection for Massive Random Access with Massive MIMO

no code implementations6 Feb 2021 Ziyue Wang, Zhilin Chen, Ya-Feng Liu, Foad Sohrabi, Wei Yu

Specifically, at each iteration, the proposed algorithm focuses on only a small subset of all potential sequences, namely the active set, which contains a few most likely active sequences (i. e., transmitted sequences by all active devices), and performs the detection for the sequences in the active set.

Action Detection Activity Detection +1

An efficient linear programming rounding-and-refinement algorithm for large-scale network slicing problem

no code implementations4 Feb 2021 Wei-Kun Chen, Ya-Feng Liu, Yu-Hong Dai, Zhi-Quan Luo

In this paper, we consider the network slicing problem which attempts to map multiple customized virtual network requests (also called services) to a common shared network infrastructure and allocate network resources to meet diverse service requirements, and propose an efficient two-stage algorithm for solving this NP-hard problem.

Networking and Internet Architecture Information Theory Signal Processing Information Theory Optimization and Control

Cramér-Rao Bound Optimization for Joint Radar-Communication Design

no code implementations29 Jan 2021 Fan Liu, Ya-Feng Liu, Ang Li, Christos Masouros, Yonina C. Eldar

We employ the Cram\'er-Rao bound (CRB) as a performance metric of target estimation, under both point and extended target scenarios.

Joint Radar-Communication

An Efficient Algorithm for Device Detection and Channel Estimation in Asynchronous IoT Systems

no code implementations20 Oct 2020 Liang Liu, Ya-Feng Liu

A great amount of endeavour has recently been devoted to the joint device activity detection and channel estimation problem in massive machine-type communications.

Action Detection Activity Detection

Time-Division Energy Beamforming for Multiuser Wireless Power Transfer with Non-Linear Energy Harvesting

no code implementations5 Jun 2020 Ganggang Ma, Jie Xu, Ya-Feng Liu, Mohammad R. Vedady Moghadam

Energy beamforming has emerged as a promising technique for enhancing the energy transfer efficiency of wireless power transfer (WPT).

Max-Min Fairness in IRS-Aided Multi-Cell MISO Systems with Joint Transmit and Reflective Beamforming

no code implementations28 Feb 2020 Hailiang Xie, Jie Xu, Ya-Feng Liu

This paper investigates an intelligent reflecting surface (IRS)-aided multi-cell multiple-input single-output (MISO) system with several multi-antenna base stations (BSs) each communicating with a single-antenna user, in which an IRS is dedicatedly deployed for assisting the wireless transmission and suppressing the inter-cell interference.

Fairness

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