Qian Cheng

Qinghai New Energy (China)

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Jiang Zhu

Tokyo Institute of Technology

Zhiying Wang

Jiangsu University of Science and Technology

Libo Huang

National University of Defense Technology

Qi Yu

National University of Defense Technology

Shilian Wang

National University of Defense Technology

Vincent Fusco

Queen's University Belfast

Bruce R. Childers

University of Pittsburgh

Junshan Luo

National University of Defense Technology

Zuohong Xu

Systems Engineering Society of China

Jianqiao Ma

National University of Defense Technology

Cooperative Institutions

National University of Defense Technology

Fudan University

Chinese Academy of Sciences

Shanghai Jiao Tong University

Changsha University

Beijing University of Technology

Nanjing University of Aeronautics and Astronautics

Shenzhen University

Zhejiang University

University of Chinese Academy of Sciences

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HPE: Hierarchical Page Eviction Policy for Unified Memory in GPUs

IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems (2019)

Qi Yu Bruce R. Childers Libo Huang Qian Cheng Zhiying Wang

Recent support for unified memory and demand paging has improved graphics processing unit (GPU) programmability and enabled memory oversubscription. However, this support introduces high overhead when page faults occur. Therefore, when the GPU memory fills to capacity, an important issue is how to select eviction candidates. The widely used policy, LRU, and the advanced replacement policies, RRIP and CLOCK-Pro, suffer from inefficiency when dealing with thrashing access patterns. They also incur significant overhead due to managing metadata at page level. In this article, we propose hierarchical page eviction (HPE), a new replacement policy for GPUs with unified memory. Aided by page walk hit information, HPE manages a page set chain dynamically. It uses statistics to classify applications into three categories and selects an appropriate eviction strategy for each category. It also applies dynamic adjustment to switch the eviction strategy when necessary. The simulation results show that, on average, HPE achieves 1.34× and 1.16× speedup (up to 2.81×) over LRU when the oversubscription rate is 75% and 50%, respectively. HPE also outperforms RRIP and CLOCK-Pro.

Eviction

Paging

Thrashing

Demand paging

Page fault

Speedup

10.1109/tcad.2019.2944790

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Citations (17)

Hybrid Beamforming Based on Dictionary Learning for Millimeter Wave MIMO System

2021 IEEE 94th Vehicular Technology Conference (VTC2021-Fall) (2019)

Li Zhu Jiang Zhu Shilian Wang Hu Li Qian Cheng

Hybrid beamforming in transmitter and receiver can improve the spectral efficiency of millimeterwave (mmWave) multiple-input multiple-output (MIMO) communication system significantly, and can reduce the complexity of communication system. However, when the number of transmitted data streams is large, the existing designing schemes of hybrid beamforming, such as sparse approximation by orthogonal matching pursuit(OMP) algorithm, suffer from performance degradation. In this paper, we propose dictionary learning (DL) algorithm to perform the design of hybrid beamforming for mmWave MIMO system. Simulation result shows that the spectral efficiency of hybrid beamforming based on DL approaches that of optimal beamforming without constraint, which is far superior to the spectral efficiency of hybrid beamforming based on OMP. Moreover, the convergence property of the proposed algorithm is also verified.

Spectral Efficiency

WSDMA

10.1109/vtcfall.2019.8891555

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Citations (1)

A Weighted Block-by-Block Decoding Algorithm for CPM-QC-LDPC Code Using Neural Network

KSII Transactions on Internet and Information Systems (2018)

Zuohong Xu Jiang Zhu Zixuan Zhang Qian Cheng

As one of the most potential types of low-density parity-check (LDPC) codes, CPM-QC-LDPC code has considerable advantages but there still exist some limitations in practical application, for example, the existing decoding algorithm has a low convergence rate and a high decoding complexity.According to the structural property of this code, we propose a new method based on a CPM-RID decoding algorithm that decodes block-by-block with weights, which are obtained by neural network training.From the simulation results, we can conclude that our proposed method not only improves the bit error rate and frame error rate performance but also increases the convergence rate, when compared with the original CPM-RID decoding algorithm and scaled MSA algorithm.

Code (set theory)

10.3837/tiis.2018.08.011

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Citations (0)

Performance Test for Big Data Workloads on Various Emerging Memories

Advances in intelligent systems and computing (2018)

Qian Cheng

Memory test

Memory map

10.1007/978-981-13-0344-9_13

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A Synchronization Scheme for Antenna in Polarization Hopping Transmission System

Zuohong Xu Yanmin Ma Qian Cheng Jiang Zhu Kai Gao

A polarization hopping wireless communication system is proposed, the matching relationship between polarization hopping sequence and polarization states of antennas is designed, and a synchronization acquisition scheme is put forward for the proposed polarization hopping wireless communication system.Then the detection and false alarm probabilities of the proposed synchronization acquisition scheme are analyzed and simulated under different pseudo-random sequences using MATLAB.The simulated results demonstrate that the proposed system can achieve best synchronization performance with RS sequence, and they also verify the feasibility of the proposed synchronization acquisition scheme.

Frequency-hopping spread spectrum

10.2991/cecs-18.2018.84

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Synergy Between Dynamic Behavior of Hydrogen Defects and Non‐Radiative Recombination in Metal‐Halide Perovskites

Small (2024)

Wencai Zhou Rongkun Zhou Xiaoqing Chen Zixiao Zhou Yongcai He

Abstract In organic‐inorganic hybrid perovskite solar cells (PSCs), hydrogen defects introduce deep‐level trap states, significantly influencing non‐radiative recombination processes. Those defects are primarily observed in MA‐PSCs rather than FA‐PSCs. As a result, MA‐PSCs demonstrated a lower efficiency of 23.6% compared to 26.1% of FA‐PSCs. In this work, both hydrogen vacancy (V H − ) and hydrogen interstitial (H i − ) defects in MAPbI 3 bulk and on surfaces, respectively are investigated. i) Bulk V H − defects have dramatic impact on non‐radiative recombination, with lifetime varying from 67 to 8 ns, depending on whether deprotonated MA 0 are ion‐bonded or not. ii) Surface H‐defects exhibited an inherent self‐healing mechanism through a chemical bond between MA 0 and Pb 2+ , indicating a self‐passivation effect. iii) Both V H − and H i − defects can be mitigated by alkali cation passivation; while large cations are preferable for V H − passivation, given strong binding energy of cation/perovskite, as well as, weak band edge non‐adiabatic couplings; and small cations are suited for H i − passivation, considering the steric hindrance effect. The dual passivation strategy addressed diverse experimental outcomes, particularly in enhancing performance associated with cation selections. The dynamic connection between hydrogen defects and non‐radiative recombination is elucidated, providing insights into hydrogen defect passivation essential for high‐performance PSCs fabrication.

Passivation

Non-radiative recombination

10.1002/smll.202405201

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Citations (1)

Water markets and water inequality: China's Water Rights Trading Pilot

Socio-Economic Planning Sciences (2024)

Jichuan Sheng Qian Cheng Hongqiang Yang

Water inequality could exacerbate global water scarcity due to the finite nature of water resources. Water markets aimed at overcoming failures in public water distribution systems may offer potential solutions to water inequality. However, existing studies failed to explain how water markets and water inequality are related. This study constructs a water inequality-water market conceptual framework to fill this gap. It examines the influence of water markets on water inequality in the context of China's Water Rights Trading Pilot. This study argues that water markets based on economic rationality can mitigate water inequality compared to command-and-control water policies. In addition, the mitigating effect of water markets on water inequality relies on changing the industrial structure, promoting technological innovation in irrigation, and improving recycled water use. Finally, the influence of water markets on water inequality tends to be heterogeneous depending on differences in economic development, precipitation, and water demand.

Water trading

10.1016/j.seps.2024.101929

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Citations (4)

WFRFT-Aided Power-Efficient Multi-Beam Directional Modulation Schemes Based on Frequency Diverse Array

IEEE Transactions on Wireless Communications (2019)

Qian Cheng Vincent Fusco Jiang Zhu Shilian Wang Fanggang Wang

The artificial noise (AN) aided multi-beam directional modulation (DM) technology is capable of wireless physical layer secure (PLS) transmissions for multiple desired receivers in free space. The application of AN, however, makes it less power-efficient for such a DM system. To address this problem, the weighted fractional Fourier transform (WFRFT) technology is employed in this paper to achieve power-efficient multi-beam DM transmissions. Specifically, a power-efficient multi-beam WFRFT-DM scheme with cooperative receivers and a power-efficient multi-beam WFRFT-DM scheme with independent receivers are proposed based on frequency diverse array (FDA), respectively. The bit error rate (BER), secrecy rate, and robustness of the proposed multi-beam WFRFT-DM schemes are analyzed. Simulations demonstrate that 1) the proposed multi-beam WFRFT-DM schemes are more power-efficient than the conventional multi-beam AN-DM scheme; 2) the transmission security can also be guaranteed even if the eavesdroppers are located close to or the same as the desired receivers; and 3) the proposed multi-beam WFRFT-DM schemes are capable of independent transmissions for different desired receivers with different modulations.

Robustness

Artificial Noise

Modulation (music)

10.1109/twc.2019.2934462

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Citations (53)

Physical-Layer Security for Frequency Diverse Array-Based Directional Modulation in Fluctuating Two-Ray Fading Channels

IEEE Transactions on Wireless Communications (2021)

Qian Cheng Shilian Wang Vincent Fusco Fanggang Wang Jiang Zhu

The frequency diverse array (FDA)-based directional modulation (DM) technology plays an important role in the physical-layer security (PLS) transmission of 5G and beyond communications. In order to meet the tremendous increase in mobile data traffic, a new memory-efficient design for the FDA-DM-based PLS transmission is urgently demanded. In this article, an analytical symmetrical multi-carrier FDA model is proposed in three dimensions, namely, range, azimuth angle, and elevation angle, differing from the conventional analytical approach with only range and azimuth angle considered. Then, a single-point (SP) artificial noise (AN) aided FDA-DM scheme is proposed, which reduces the memory consumption significantly compared with the conventional zero-forcing (ZF) and singular value decomposition (SVD) approaches. Moreover, the PLS performance of the proposed FDA-DM scheme is analyzed in fluctuating two-ray (FTR) fading channels for the first time, including the average secrecy capacity (ASC) and the secrecy outage probability (SOP). More importantly, the closed-form expressions for the lower bound on ASC and the upper bound on SOP are derived, respectively. The effectiveness of the analytical expressions is verified by numerical simulations. This work opens a way to lower the memory requirements for DM-based PLS transmission of 5G and beyond communications.

Modulation (music)

Artificial Noise

10.1109/twc.2021.3056521

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Citations (19)

A Two-Ray Multipath Model for Frequency Diverse Array-Based Directional Modulation in MISOME Wiretap Channels

2021 IEEE 94th Vehicular Technology Conference (VTC2021-Fall) (2019)

Qian Cheng Vincent Fusco Shilian Wang Jiang Zhu

A two-ray multipath model for frequency diverse array (FDA)-based directional modulation (DM) is proposed in multi-input single-output multi-eavesdropper (MISOME) wiretap channels for the first time. The excitation factors of the FDA and the weighting coefficients of the inserted artificial noise (AN) are jointly designed in a way which imposes no impact on the desired receiver while simultaneously distorting the received signals of eavesdroppers. Secrecy rate is analyzed for the proposed two-ray multipath FDA-based DM model. Numerical simulations verify the capability of physical layer secure (PLS) transmissions of the proposed FDA-DM model in two-ray multipath MISOME wiretap channels.

Modulation (music)

Artificial Noise

10.1109/vtcfall.2019.8890978

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Citations (1)