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Qingwen Liu
Tongji University
40Publications
11H-index
2,076Citations
Publications 40
Newest
Published on May 1, 2019 in ICC (International Conference on Communications)
1 Citations Source Cite
Published on Jan 1, 2019in IEEE Internet of Things Journal 5.87
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Published on Dec 1, 2018 in GLOBECOM (Global Communications Conference)
Aozhou Wu (Tongji University), Qingqing Zhang2
Estimated H-index: 2
(Tongji University)
+ 4 AuthorsPengfei Xia2
Estimated H-index: 2
(Tongji University)
Resonant Beam Charging (RBC) is a promising multi-Watt and multi-meter wireless power transfer method with safety, mobility and simultaneously-charging capability. However, RBC system operation relies on information availability including power receiver location, class label and the receiver number. Since smartphone is the most widely-used mobile device, we propose a Mask R-CNN based smartphone detection model in the RBC system. Experiments illustrate that our model reduces the smartphone scanni...
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Published on Sep 28, 2018in arXiv: Signal Processing
Mingliang Xiong1
Estimated H-index: 1
(Tongji University),
Qingwen Liu11
Estimated H-index: 11
(Tongji University)
+ 1 AuthorsPengfei Xia2
Estimated H-index: 2
The vision and requirements of the sixth generation (6G) mobile communication systems are expected to adopt free-space optical communication (FSO) and wireless power transfer (WPT). The laser-based WPT or wireless information transfer (WIT) usually faces the challenges of mobility and safety. We present here a mobile and safe resonant beam communication (RBCom) system, which can realize high-rate simultaneous wireless information and power transfer (SWIPT). We propose the analytical model to dep...
Published on Jun 1, 2018
Sai Jiang (Tongji University), Qingqing Zhang2
Estimated H-index: 2
(Tongji University)
+ 3 AuthorsPengfei Xia2
Estimated H-index: 2
(Tongji University)
Existing Unmanned Aerial Vehicles (UAVs) mainly rely on the direct ground-to-UAV communications over the unlicensed spectrum, which can only operate within the visual line of sight. Integrating UAVs into cellular networks is a promising solution to extend the range but poses new challenges to the transport protocols. To ensure the flight safety, the transmission of UAV commands and mission-related data is required to be reliable with low latency. In this paper, we propose a Low-latency Reliable ...
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Published on Jan 1, 2018in arXiv: Signal Processing
Mingqing Liu , Mingliang Xiong1
Estimated H-index: 1
+ 3 AuthorsPengfei Xia2
Estimated H-index: 2
Similar to the evolution from wired Internet to mobile Internet (MI), the growing demand of power delivery anywhere and anytime appeals for power grid transformation from wired to mobile domain. We propose here the next generation of power delivery network -- mobile energy internet (MEI) for wireless energy transfer within a mobile range from several meters to tens of meters. MEI will be a significant complement for Internet of things (IoT), because battery charging is one of the biggest headach...
Published on Sep 1, 2017
Qingqing Zhang2
Estimated H-index: 2
(Tongji University),
Xiaojun Shi1
Estimated H-index: 1
+ 3 AuthorsYong Liao1
Estimated H-index: 1
Distributed laser charging (DLC) is a wireless power transfer technology for mobile electronics. Similar to traditional wireless charging systems, the DLC system can only provide constant power to charge a battery. However, Li-ion battery needs dynamic input current and voltage, thus power, in order to optimize battery charging performance. Therefore, neither power transmission efficiency nor battery charging performance can be optimized by the DLC system. We at first propose an adaptive DLC (AD...
1 Citations Source Cite
Published on Mar 1, 2017in IEEE Transactions on Vehicular Technology 4.43
Wenfeng Li3
Estimated H-index: 3
(Tongji University),
Xiaomin Ma17
Estimated H-index: 17
(Oral Roberts University)
+ 3 AuthorsQingwen Liu11
Estimated H-index: 11
(Tongji University)
In a traffic jam or dense vehicle environment, vehicular ad hoc networks (VANETs) cannot meet the safety requirement due to serious packet collisions. The traditional cellular network solves packet collisions but suffers from long end-to-end delay. Third-Generation Partnership Project (3GPP) Long-Term Evolution (LTE) overcomes both drawbacks; thus, it may be used, instead of VANETs, in some extreme environments. We use Markov models with dynamic scheduling and semipersistent scheduling (SPS) to ...
11 Citations Source Cite
Published on Dec 1, 2016in IEEE Vehicular Technology Magazine 6.04
Qingwen Liu11
Estimated H-index: 11
,
Jun Wu10
Estimated H-index: 10
(Tongji University)
+ 4 AuthorsLajos Hanzo65
Estimated H-index: 65
(University of Southampton)
Increasing the battery-recharge period of smartphones is becoming a challenge since their power consumption is increased as a result of enhanced functions that require sophisticated multimedia signal processing. An attractive solution is constituted by wireless charging, which is capable of replenishing the battery over the ether. Given this motivation, we present the fundamental physics and the related system structure of a promising wireless charging technique, i.e., distributed laser charging...
10 Citations Source Cite
Published on May 1, 2016 in VTC (Vehicular Technology Conference)
Yanping Yang3
Estimated H-index: 3
,
Chen Wei23
Estimated H-index: 23
(THU: Tsinghua University)
+ 2 AuthorsLajos Hanzo65
Estimated H-index: 65
(University of Southampton)
As a promising technique, cooperative relaying has attracted more and more attention from academia and industry recently. In this paper, we investigate the scheme of Decode-and-Forward Two-way Relaying (DF-TWR) relying on a cross-layer design, which combines adaptive Network-coded Modulation (NCM) at the physical layer and truncated Automatic Repeat reQuest (ARQ) at the data link layer. The relay node utilizes Network- Coded Quadrature amplitude modulation (NC-QAM) where NCM imposes only a modes...
1 Citations Source Cite
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