Wei-Ping Zhu

Wei-Ping Zhu
Concordia University Montreal · Department of Electrical and Computer Engineering

Doctor of Engineering

About

498
Publications
33,766
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Introduction
Skills and Expertise

Publications

Publications (498)
Article
Background The role of surgery in nasopharyngeal carcinoma liver metastases (NCLM) remains elusive, and the current application is limited. We aim to investigate whether hepatic resection (HR) of NCLM improves survival compared with non-hepatic resection (NHR) treatment. Methods One hundred and thirty-three patients with NCLM from 2007 to 2017 wer...
Article
Full-text available
Folic acid, served as dietary supplement, is closely linked to one-carbon metabolism and methionine metabolism. Previous clinical evidence indicated that folic acid supplementation displays dual effect on cancer development, promoting or suppressing tumor formation and progression. However, the underlying mechanism remains to be uncovered. Here, we...
Article
The terahertz (THz) waves with enormous bandwidth can be used along with the existing sub-6 GHz and millimeter wave (mmWave) bands to achieve the ever evolving ecosystem of applications that need to be supported by the modern wireless networks. This paper investigates a user-centric dynamic base station (BS) clustering design for a hybrid network w...
Preprint
Full-text available
Statistical characterization of the signal-to-noise ratio (SNR) of reconfigurable intelligent surface (RIS)-assistedcommunications in the presence of phase noise is an important open issue. In this letter, we exploit the concept of copula modeling to capture the non-standard dependence features that appear due to the presence of discrete phase nois...
Article
Full-text available
In this paper, we investigate the outage performance of an uplink (UL) non-orthogonal multiple access (NOMA)-based hybrid satellite-terrestrial relay network (HSTRN), in which two users communicate with the satellite through a decode-and-forward (DF) relay due to the lack of direct link. To provide a comprehensive yet hitherto unexplored outage ana...
Conference Paper
This paper investigates a user-centric clustering model for a hybrid network comprising both millimeter-wave (mmWave) and terahertz (THz) base stations (BSs). Based on the proposed model, a user can choose to be cooperatively served by multiple mmWave or multiple THz BSs depending on their link quality. Besides, to maximize the cooperation gains, t...
Article
In this paper, an image based indoor localization technique using multiple binocular cameras is proposed by the deep learning and multimodal fusion. First, by taking advantage of the cross-model correlations between various multimodal images for localization purpose, the obtained images are concatenated to form two new modalities: three-channel gra...
Article
In this paper, we propose three new compressive sensing-based algorithms for channel estimation in millimeter wave hybrid MIMO systems over doubly (time and frequency) selective channels. Utilizing the basis expansion model (BEM) for effectively representing doubly selective channels, we first propose a BEM-based block orthogonal matching pursuit (...
Article
Full-text available
Sparse arrays can increase the array aperture and degrees of freedom through the construction of either sum or difference co-arrays or both. In order to exploit the advantages of sparse arrays while estimating directions of arrival (DOAs) of a mixture of circular and non-circular signals, in this paper, a gridless DOA estimation method is proposed...
Article
Full-text available
Unmanned aerial vehicle (UAV) relay system has received significant attention in future wireless communications. In this article, the ergodic sum rate of a multisource multidestination UAV relaying is investigated. Here, an UAV with multiple antennas is deployed as an aerial relay using threshold‐based decode‐and‐forward protocol to assist signal t...
Article
In recent years, some gridless methods have been developed for two-dimensional direction-of-arrival (DOA) estimation due to their superiority over on-grid or off-grid methods. However, the existing gridless methods treat every sparse planar array as a generalized planar array, regardless of some particular geometries of the arrays, e.g., the L-shap...
Article
The energy efficiency of intelligent reflecting surface (IRS) enabled internet of things (IoT) networks is studied in this letter. The energy efficiency is mathematically expressed, respectively, as the number of reflecting elements and the spectral efficiency of the network and is shown to scale in the logarithm of the reflecting elements number i...
Article
In this letter, we investigate an artificial noise (AN) aided beamforming scheme for full-duplex amplify-and-forward relay network in the presence of multiple untrusted energy harvesting receivers (EHRs). We establish an optimization problem to maximize the secrecy energy efficiency (SEE), while meeting the self-interference nulling and transmit po...
Article
In this paper, we investigate the topological interference management (TIM) problem in the presence of measurement error of the network topology. We formulate the TIM problem as a low-rank matrix recovery problem and then solve it through an alternating algorithm to recover the true network topology. Our numerical results demonstrate that the propo...
Article
Since the end of 2019, Novel Corona Virus Disease (COVID19) has brought about a plethora of unforeseen changes to the world as we know it. Despite our ceaseless fight against it, COVID19 has claimed millions of lives, and the death toll exacerbated due to its extremely contagious and fastspreading nature. To control the spread of this highly contag...
Article
This letter proposes a robust beamforming scheme to enhance the physical layer security (PLS) of multicast transmission in a cognitive satellite and aerial network (CSAN) operating in the millimeter wave frequency band. Based on imperfect channel state information (CSI) of both eavesdroppers (Eves) and primary users (PUs), we maximize the minimum a...
Article
Full-text available
In this paper, we investigate the uplink transmission in a satellite-aerial-terrestrial network (SATN), where an aerial platform acts as an amplify-and-forward relay assisting the communication between multiple users and satellite. The users send messages to the aerial relay via radio frequency (RF) links, which are then forwarded to the satellite...
Article
This paper analyzes the downlink transmission performance of an aeronautical broadband satellite communication system operating at millimeter wave (mmWave) band. Specifically, by considering that two adjacent satellites cooperatively communicate with an airplane employing an antenna array, we first propose a simple transmit scheme combining Alamout...
Article
This letter analyzes the coverage performance of user-centric dense terahertz (THz) networks in which each user is cooperatively served by multiple base stations (BSs). Both dynamic and static clustering approaches are considered, based on which we study the coverage probability of the user-centric THz network by using stochastic geometry. Numerica...
Article
Full-text available
In this paper, we investigate secrecy-energy efficient hybrid beamforming (BF) schemes for a satellite-terrestrial integrated network, wherein a multibeam satellite system shares the millimeter wave spectrum with a cellular system. Under the assumption of imperfect angles of departure for the wiretap channels, the hybrid beamformer at the base stat...
Article
Full-text available
In this paper, we present a new two-stage speech enhancement approach, specially conceived to reduce musical and other random noises without requiring their localization in the time–frequency domain. The proposed method is motivated by two observations: (1) the random scattering nature of the energy peaks corresponding to the musical noise in the s...
Article
Non-orthogonal multiple access (NOMA) coupled with massive multiple-input multiple-output (MIMO) base stations hold immense potential in increasing the spectral and energy efficiencies while enabling massive access of future cellular networks. To this end, we investigate the rate performance of a system employing multi-user NOMA and massive MIMO ba...
Preprint
This paper proposes a robust beamforming scheme to enhance the physical layer security (PLS) of multicast transmission in a cognitive satellite and aerial network (CSAN) operating in the millimeter wave frequency band. Based on imperfect channel state information (CSI) of both eavesdroppers (Eves) and primary users (PUs), we maximize the minimum ac...
Preprint
This paper proposes a robust beamforming (BF) scheme to enhance physical layer security (PLS) of the downlink of a multibeam satellite system in the presence of either uncoordinated or coordinated eavesdroppers (Eves). Specifically, with knowing only the approximate locations of the Eves, we aim at maximizing the worst-case achievable secrecy rate...
Article
In this paper, we study the outage performance of a multiuser satellite–aerial–terrestrial network (SATN) with amplify-and-forward protocol, where the satellite intends to send messages to multiple users with the help of a multi-antenna aerial platform as a relay. Here, we assume that the satellite–aerial link via free space optical (FSO) experienc...
Article
Hybrid beamforming design for OFDM systems is hugely challenging since their analog precoders and combiners are shared among all subcarriers. This paper proposes a novel two-stage joint hybrid precoder and combiner design for maximizing the average achievable sum-rate of frequency-selective millimeter-wave massive MIMO-OFDM systems. In the proposed...
Article
This paper proposes a robust beamforming (BF) scheme to enhance physical layer security (PLS) of the downlink of a multibeam satellite system in the presence of either uncoordinated or coordinated eavesdroppers (Eves). Specifically, with knowing only the approximate locations of the Eves, we aim at maximizing the worst-case achievable secrecy rate...
Article
This letter investigates the error probability of reconfigurable intelligent surfaces (RIS)-enabled communication systems with quantized channel phase compensation. Exact and asymptotic bit error rate (BER) expressions are derived assuming different practical channel environments and the presence of the direct link. The theoretical frameworks and f...
Article
In millimeter wave (mmWave) networks, base stations (BSs) are expected to be densely deployed in order to meet the demands of mobile users. A major challenge in dense mmWave networks is the interference experienced by the user from the neighboring BSs which limits the density of deployed BSs. A promising solution to this challenge is to adopt user-...
Article
Broad‐band satellite communication is an indispensable method to provide seamless connectivity for people especially in remote areas. This paper analyzes the performance of the forward link of a multiuser satellite system operating in Ka band, where a gateway delivers signal to a satellite that forwards the amplified signal to multiple users on the...
Article
Full-text available
A natural choice to model strong temporal dynamics of speech is the recurrent neural network (RNN) since it can exploit the sequential information from consecutive acoustic frames and generalizes the model well to unseen speakers. Besides, the convolutional neural network (CNN) can automatically extract sophisticated speech features that can maximi...
Preprint
In this paper, we propose a transformer-based architecture, called two-stage transformer neural network (TSTNN) for end-to-end speech denoising in the time domain. The proposed model is composed of an encoder, a two-stage transformer module (TSTM), a masking module and a decoder. The encoder maps input noisy speech into feature representation. The...
Article
Full-text available
This letter analyzes the outage performance of a novel two-user non-orthogonal multiple access (NOMA)-based hybrid satellite-terrestrial relay network (HSTRN), in which one user can directly receive the signals from the satellite while the other user can only acquire its desired signal through a multiple-antenna decode-and-forward (DF) relay. In pa...
Article
This letter provides a unified performance analysis of secure reconfigurable intelligent surface (RIS)-assisted communications in the presence of discrete phase shifts. In particular, we derive exact secrecy outage probability in the presence of non-colluding and colluding eavesdroppers, and we obtain the corresponding diversity orders. Moreover, a...
Article
This paper investigates the security and energy efficiency of ultra-high reliability and low latency (URLLC) internet of things (IoT) networks. We first formulate an optimization problem to maximize the secured energy efficiency of the network based on a new capacity formula. We then seek an approximation to the original intractable cost function,...
Article
This paper investigates the throughput improvement of cell-free massive multiple-input multiple-output (MIMO) systems by non-orthogonal multiple access (NOMA) for future cellular networks under stochastic access point and user locations. In this context, the node locations are modeled with Poisson point processes. The time division duplexing mode i...
Article
Full-text available
To satisfy the explosive access demands of internet-of-things (IoT) devices, various kinds of multiple access techniques have received much attention. In this paper, we investigate the multicast communication of a satellite and aerial integrated network (SAIN) with rate-splitting multiple access (RSMA), where both satellite and unmanned aerial vehi...
Preprint
Full-text available
In this paper, we analyze the error probability of reconfigurable intelligent surfaces (RIS)-enabled communication systems with quantized channel phase compensation over Rayleigh fading channels. The probability density and characteristic functions of the received signal amplitude are derive dand used to compute exact expressions for the bit error...
Article
Full-text available
This paper investigates the massive access for a satellite-aerial-terrestrial network (SATN), where a high-altitude platform (HAP) is deployed as a relay to assist the uplink transmission from terrestrial user equipment (UE) to satellite. Unlike previous works, we adopt radio frequency (RF) and free space optical for the aerial-terrestrial and sate...
Article
Full-text available
Sleep apnea, a severe sleep disorder, is a clinically complicated disease that requires timely diagnosis for proper treatment. In this paper, an automated deep learning-based approach is proposed for the detection of sleep apnea frames from electroencephalogram (EEG) signals. Unlike conventional methods of direct feature extraction from EEG signals...
Article
In this letter, the outage performance of a novel non-orthogonal multiple access (NOMA)-based hybrid satelliteterrestrial relay network (HSTRN) is analyzed, where the satellite can directly communicate with one user while communicating with the other user only through an amplify-and-forward (AF) multiple-antenna relay. Exact and asymptotic outage p...
Article
In this letter, we propose a novel 3D joint transmission framework for user-centric air-to-air communication in unmanned aerial vehicles (UAVs) networks. The proposed framework clusters aerial base stations (ABSs) to cooperate on a dynamic basis, thereby enhancing the aerial user equipment (AUEs) performance. Using stochastic geometry, a new expres...
Article
Satellite-based Internet of Things (IoT) is recognized as a cost-effective approach for global access. In this paper, we aim at improving the spectrum efficiency of satellite systems to serve a huge number of IoT devices. To this end, we present a cognitive satellite-terrestrial framework, where a multibeam satellite system with full frequency reus...
Article
In this paper, we propose a new speech enhancement system using a deep neural network (DNN)-augmented colored-noise Kalman filter. In our system, both clean speech and noise are modelled as autoregressive (AR) processes, whose parameters comprise the linear prediction coefficients (LPCs) and the driving noise variances. The LPCs are obtained throug...
Article
Full-text available
Simultaneous wireless information and power transfer (SWIPT) is a promising solution for future wireless networks as it provides convenient and perpetual energy supplies to wireless users. This study proposes three new transceiver design schemes in two‐way relay networks with SWIPT. Firstly, a transmit power minimisation solution is proposed with a...
Preprint
In this paper, we develop a comprehensive theoretical framework for analyzing the performance of reconfigurable intelligent surfaces (RISs)-assisted communication systems over generalized fading channels and in the presence of phase noise. To this end, we propose the Fox's H model as a unified fading distribution for a large number of widely used g...
Preprint
Full-text available
In this paper, we propose a novel joint hybrid precoder and combiner design for maximizing the average achievable sum-rate of single-user orthogonal frequency division multiplexing millimeter wave massive MIMO systems. We formulate the analog precoder and combiner design as a constrained Tucker2 decomposition and solve it by using the projected alt...
Article
Full-text available
In this paper, we propose a hybrid speech enhancement system that exploits deep neural network (DNN) for speech reconstruction and Kalman filtering for further denoising, with the aim to improve performance under unseen noise conditions. Firstly, two separate DNNs are trained to learn the mapping from noisy acoustic features to the clean speech mag...
Article
This paper analyzes the outage performance of a satellite-aerial-terrestrial network (SATN), where the satellite-aerial and aerial-terrestrial links utilize free space optical (FSO) with Gamma-Gamma fading and radio frequency (RF) transmission with Rayleigh fading, respectively. In particular, by considering the impacts of pointing error in FSO lin...
Article
Full-text available
In this paper, we propose a hybrid beamforming design for multiuser mmWave massive MIMO systems. We adopt a two-stage approach for designing the analog and digital beamforming separately. The analog beamforming design is based on a constrained low-rank channel decomposition and aims to simultaneously harvest the array gain and reduce the intra-and...
Article
Full-text available
Rate-splitting multiple access (RSMA) has recently received considerable attention due to its high efficiency in both spectral utilization and energy consumption. Inspired by this emerging technique, this paper presents a secure beamform-ing (BF) scheme for RSMA-based cognitive satellite terrestrial networks in the presence of multiple eavesdropper...
Article
This paper investigates the integration of wireless information and power transfer (SWIPT) and cell-free massive multiple-input multiple-output (MIMO) technologies for a cell-free spatially random network, where the access points (APs) are located randomly and modeled using a Poisson point process, and the users' energy and data transfers are separ...
Conference Paper
Activity recognition from wearable sensors is a promising field of research with a wide variety of applications to track human activity from distant positions. In this paper, a multi-stage long short term memory (LSTM) based deep neural network is proposed to integrate multimodal features from numerous sensors for activity recognition. In the first...
Article
Full-text available
This paper addresses the security problem for wireless powered cognitive satellite-terrestrial network, where a multibeam satellite sub-network shares the portion of millimeter wave bands with multiple cellular networks, each consisting of a base station, several mobile users (MUs) and energy receivers (ERs). Considering that the ERs are potential...