Hanwen Luo

Shanghai Jiao Tong University, Shanghai, Shanghai Shi, China

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Publications (102)45.74 Total impact

  • Zhe Luo · Ming Ding · Hanwen Luo
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    ABSTRACT: In this letter, we propose a novel component carrier on/off scheduling scheme using the learning-based prediction for LTE in the unlicensed spectrum. Particularly, we use Lyapunov optimization to improve the performance of packet throughput and energy consumption, and use Vapnik-Chervonenkis theory to analyze the gap between the predicted optimal value and the practical one. The simulation results show that the proposed scheme can deliver good trade-off between packet throughput and energy consumption by turning off some carrier components, especially when the traffic load is not high.
    No preview · Article · Dec 2015 · IEEE Communications Letters
  • Bo Gong · Qibo Qin · Xiang Ren · Lin Gui · Hanwen Luo · Wen Chen
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    ABSTRACT: Doubly selective (DS) channel estimation in largescale multiple-input multiple-output (MIMO) systems is a challenging problem due to the requirement of unaffordable pilot overheads and prohibitive complexity. In this paper, we propose a novel distributed compressive sensing (DCS) based channel estimation scheme to solve this problem. In the scheme, we introduce the basis expansion model (BEM) to reduce the required channel coefficients and pilot overheads. And due to the common sparsity of all the transmit-receive antenna pairs in delay domain, we estimate the BEM coefficients by considering the DCS framework, which has a simple linear structure with low complexity. Further more, a linear smoothing method is proposed to improve the estimation accuracy. Finally, we conduct various simulations to verify the validity of the proposed scheme and demonstrate the performance gains of the proposed scheme compared with conventional schemes.
    No preview · Article · Nov 2015
  • Pu Zhao · Meng Zhang · Hui Yu · Hanwen Luo · Wen Chen
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    ABSTRACT: This paper studies the beamforming design problem of a multiuser downlink network, assuming imperfect channel state information known to the base station. In this scenario, the base station is equipped with multiple antennas, and each user is wiretapped by a specific eavesdropper where each user or eavesdropper is equipped with one antenna. It is supposed that the base station employs transmit beamforming with a given requirement on sum transmitting power. The objective is to maximize the sum secrecy rate of the network. Due to the uncertainty of the channel, it is difficult to calculate the exact sum secrecy rate of the system. Thus, the maximum of lower bound of sum secrecy rate is considered. The optimization of the lower bound of sum secrecy rate still makes the considered beamforming design problem difficult to handle. To solve this problem, a beamforming design scheme is proposed to transform the original problem into a convex approximation problem, by employing semidefinite relaxation and first-order approximation technique based on Taylor expansion. In addition, with the advantage of low complexity, a zero-forcing-based beamforming method is presented in the case that base station is able to nullify the eavesdroppers’ rate. When the base station does not have the ability, user selection algorithm would be in use. Numerical results show that the former strategy achieves better performance than the latter one, which is mainly due to the ability of optimizing beamforming direction, and both outperform the signal-to-leakage-and-noise ratio-based algorithm.
    No preview · Article · Sep 2015 · IEEE Transactions on Information Forensics and Security
  • Zhe Luo · Ying Cui · Xinbing Wang · Hanwen Luo
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    ABSTRACT: In this paper, we study the impact of human mobility on throughput and delay for people-centric applications in mobile ad hoc networks (MANETs). We consider a general human mobility model for MANETs, which can capture important features of human mobility, such as time correlation, node correlation, location heterogeneity, and node heterogeneity. Multiple unicasts with general arrival processes are delivered, and nodes are equipped with infinite buffers. Under our system model, we first characterize the network stability region in terms of the probability of each node set visiting each location and the amount of transmission resources at each location. We show that the node correlation and heterogeneity of locations' popularity usually decrease the size of the network stability region, whereas the diversity of locations visited by a node usually increases the size of the network stability region. Then, by solving a stability-related optimization problem, we develop a throughput-optimal policy based on the obtained optimal solution. We obtain the upper and lower bounds of the delay performance under the proposed policy. Finally, using simulations based on a theoretical model and some real traces, we verify the analytical results and compare the performance of the proposed policy with some existing policies.
    No preview · Article · Jun 2015 · IEEE Transactions on Communications
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    ABSTRACT: In this paper, we analyze the impact of network coding (NC) configuration on the performance of ad hoc networks with the consideration of two significant factors, namely, the throughput loss and the decoding loss, which are jointly treated as the overhead of NC. In particular, physical-layer NC and random linear NC are adopted in static and mobile ad hoc networks (MANETs), respectively. Furthermore, we characterize the goodput and delay/goodput tradeoff in static networks, which are also analyzed in MANETs for different mobility models (i.e., the random independent and identically distributed (i.i.d.) mobility model and the random walk model) and transmission schemes (i.e., the two-hop relay scheme and the flooding scheme). Moreover, the optimal configuration of NC, which consists of the data size, generation size, and NC Galois field, is derived to optimize the delay/goodput tradeoff and goodput. The theoretical results demonstrate that NC does not bring about order gain on delay/goodput tradeoff for each network model and scheme, except for the flooding scheme in a random i.i.d. mobility model. However, the goodput improvement is exhibited for all the proposed schemes in mobile networks. To our best knowledge, this is the first work to investigate the scaling laws of NC performance and configuration with the consideration of coding overhead in ad hoc networks.
    No preview · Article · May 2015 · IEEE Transactions on Vehicular Technology
  • Zhe Luo · Xiaoying Gan · Xinbing Wang · Hanwen Luo

    No preview · Article · Jan 2015 · IEEE Transactions on Vehicular Technology
  • Yi Qin · Ming Ding · Meng Zhang · Hui Yu · Hanwen Luo
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    ABSTRACT: In this letter, we study robust beamforming design in the scenario that user equipments (UEs) relay the messages from a base station (BS) to a destination UE out of the cellular networks, which is considered as a high-priority device-to-device (D2D) scenario in the 3rd Generation Partnership Project (3GPP) Long-Term-Evolution (LTE) standardization. We assume that another D2D UE, which receives data from another D2D transmission group, coexists in the network, and it is interfered by D2D relay UEs. Moreover, the channel links between D2D relay UEs and the interfered UE are supposed to suffer from Gaussian errors due to low accuracy of channel estimation. Our optimization objective is to minimize the total transmission power at the BS and D2D relay UEs, while satisfying the signal-to-interference-plus-noise ratio (SINR) requirement of the destination D2D receiver and keeping the probability of low SINR event of the interfered D2D receiver smaller than a predefined threshold. Finally, we present the joint BS and D2D relay UE beamforming design, the effectiveness of which is verified by computer simulations.
    No preview · Article · Oct 2014 · IEEE Communications Letters
  • Pu Zhao · Meng Zhang · Hui Yu · Hanwen Luo · Wen Chen
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    ABSTRACT: This paper studies he beamforming design problem of a multi-user downlink network, assuming perfect channel state information (CSI) known to the base station (BS). In this scenario, the BS is equipped with multiple antennas, and each user is wiretapped by a specific eavesdropper where each user or eavesdropper is equipped with one antenna. It is supposed that the BS employs transmit beamforming with a given requirement on sum transmitting power. The object is to maximize the sum secrecy rate (SSR) of the network, which leads to a nonconvex complicated structure, and makes he considered beamforming design problem difficult to handle. To solve this problem, a beamforming design scheme is proposed to transform the original problem into a convex approximation problem, by employing semidefinite relaxation (SDR) and first-order approximation technique based on Taylor expansion. Besides, with the advantage of low complexity, a zero-forcing (ZF) based beamforming method is presented in the case that BS is able to nullify he eavesdroppers' rate. Numerical results show that the former strategy achieves better performance than the later one, which is mainly due to the ability of optimizing beamforming direction, and both outperform the traditional signal-to-leakage-and-noise ratio (SLNR) based algorithm.
    No preview · Conference Paper · Oct 2014
  • Zhe Luo · Ming Ding · Hanwen Luo
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    ABSTRACT: In this letter, we propose a novel dynamic cell on/off scheduling algorithm in small cell networks based on the Stackelberg game. The objective of the proposed algorithm is to optimize the packet throughput performance with a tradeoff of energy consumption. In our system-level simulations, the proposed algorithm exhibits considerable performance gains, in terms of packet throughput per unit of energy consumption, compared with two existing algorithms respectively based on random on/off and packet arrival-triggered cell activation.
    No preview · Article · Sep 2014 · IEEE Communications Letters
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    ABSTRACT: In this paper, we use the Lyapunov optimization technique to develop scheduling policies for multiradio multichannel cognitive networks to optimize jointly the throughput and the average delay of a secondary network, with limited interference to primary users (PUs)' transmission. In particular, we consider three scenarios, including a static single-hop secondary network, a static multihop secondary network, and a mobile secondary network. For these cases, with the consideration of general mobility and interference models, we design efficient scheduling and channel allocation algorithms based on the concept of Lyapunov drift and give the corresponding performance bound. Furthermore, our theoretical analysis demonstrates that the proposed algorithms can achieve a flexible tradeoff between network throughput and average backlogs by using the Lyapunov optimization technique. Finally, the efficiency of the proposed algorithms is verified by the numerical simulations.
    No preview · Article · Sep 2014 · IEEE Transactions on Vehicular Technology
  • Ming Ding · Hanwen Luo · Wen Chen
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    ABSTRACT: In this paper, we investigate the robust beamforming for multi-user multiple-input single-output systems underquantized channel direction information (CDI) with per-antenna power constraints. The robustness of the consideredbeamforming design is achieved in the sense that the stochastic interference leakage is below a certain level by a givenprobability. Our design objective is to maximize the expectation of the weighted sum-rate performance. From thediscussion of the non-robust optimal beamforming based on the polyblock algorithm, we propose a robust beamformingscheme for the quantized CDI case with per-antenna power constraints. In the proposed beamforming scheme, we useJensen's inequality to generate a tractable feasibility problem for the polyblock algorithm and apply the semi-definiteprogramming relaxation, as well as the randomization technique to find its approximate rank-one matrix solution and userequipments' beamforming vectors. Simulation results show that substantial gains can be achieved by the proposed schemecompared with the existing schemes in terms of the average weighted sum-rate performance. Although very high complexityis required for the implementation of the proposed scheme, it stands as a good benchmark for robust beamformingdesigns.
    No preview · Article · Aug 2014 · IEEE Transactions on Wireless Communications
  • Ming Ding · Meng Zhang · Hanwen Luo · Wen Chen
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    ABSTRACT: In this paper, we investigate the robust beamforming schemes for a multi-user multiple-input-single-output (MU-MISO) system with per-antenna power constraints and quantized channel direction information (CDI) feedback. Our design objective is to maximize the expectation of the weighted sum-rate performance by means of controlling the interference leakage and properly allocating the power among user equipments (UEs). First, we prove the optimality of the non-robust zero-forcing (ZF) beamforming scheme in the sense of generating the minimum amount of average inter-UE interference under quantized CDI. Then we derive closed-form expressions of the cumulative density function (CDF) of the interference leakage power for the non-robust ZF beamforming scheme, based on which we adjust the leakage thresholds and propose two robust beamforming schemes under per-antenna power constraints with an iterative process to update the per-UE power allocations using the geometric programming (GP). Simulation results show the superiority of the proposed robust beamforming schemes compared with the existing schemes in terms of the average weighted sum-rate performance.
    No preview · Article · Nov 2013 · IEEE Transactions on Signal Processing
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    ABSTRACT: In recent years, there is a significant trend for VANET to provide not only traditional services like warning information exchanging for road safety and car collision avoidance but also various multimedia applications such as mobile TV which may require broadband access to core network or Internet. On the other hand, service provision technologies with point-to-multipoint transmission mode which could better utilize the limited wireless resource have been well discussed and standardized, such as MBMS in 3GPP and BCMCS in 3GPP2. In this paper, we propose an effective solution aimed to enable multicast/broadcast service provision in integrated VANET-cellular heterogeneous wireless networks based on a two-phase cooperative transmission strategy. Through analysis and simulation, our proposal combines advantages of these two heterogeneous networks and the nature of multicast/broadcast technology.
    No preview · Conference Paper · Oct 2013
  • Meng Zhang · Haike Yi · Hui Yu · Hanwen Luo · Wen Chen
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    ABSTRACT: This paper studies the precoder design of bidirectional networks in which each node is equipped with multiple antennas. In contrast to the conventional model of bidirectional relay networks, this paper considers a more general scenario, i.e., a multi-user multi-relay network. First, by assuming that perfect channel state information (CSI) is available, we investigate the precoding design for the relays and users to minimize the sum mean squared error (MSE) and the maximum of single user's MSE, respectively. Then, we consider a more practical scenario where CSI estimation error is taken into account. By means of alternating optimization approach, we decompose the main problem into several decoupled subproblems with tractable solutions. It is shown that, in both the perfect and imperfect CSI cases, the proposed precoding algorithms outperform the existing solutions in terms of MSE and bit-error-rate (BER) performance.
    No preview · Article · Sep 2013 · IEEE Transactions on Vehicular Technology
  • Ruiqi Xue · Meng Zhang · Hui Yu · Hanwen Luo · Xiaohua Tian · Li Li
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    ABSTRACT: Wireless devices have experienced great development in the past decade. During this period, secrecy studies have drawn heated attention. Traditionally, there mainly exist two methods to optimize secrecy transmissions, precoding scheme and artificial-noise-aided scheme. In this paper, we propose a joint design of precoding and artificial noise in a relay-aided network with the channel state information (CSI) already known. Besides, based on wiretapping knowledge known or not, defined by whether we have known which user is wiretapped, we proposed two different schemes. Simulation results are given to verify the effectiveness of our proposed schemes.
    No preview · Conference Paper · Aug 2013
  • Meng Zhang · Jian Huang · Hui Yu · Hanwen Luo · Wen Chen
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    ABSTRACT: In this letter, we study relay-aided networks with presence of single eavesdropper. We provide joint beamforming design of the source and relay that can minimize the overall power consumption while satisfying our predefined quality-of-service (QoS) requirements. Additionally, we investigate the case that the channel between relay and eavesdropper suffers from channel uncertainty. Finally, simulation results are provided to verify the effectiveness of our algorithm.
    No preview · Article · Aug 2013 · IEEE Communications Letters
  • Kai Ying · Hui Yu · Hanwen Luo
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    ABSTRACT: Mobile and wireless communication has been evolved from the basic model for providing point-to-point voice centric services into more complicated service provision technologies with point-to-multipoint transmission mode, such as MBMS in 3GPP and BCMCS in 3GPP2. However, the group member with the worst channel condition becomes the bottleneck since the base station or access point is supposed to take care of all the users in a multicast group whose members would like to receive a same service. On the other hand, delay is one of the most important QoS criteria along with throughput especially for realtime services such as mobile TV and IP conference. In this paper, we propose a framework for performance analysis of multicast service with delay constraints. Additionally, an admission control policy for real-time multicast scheduling is demonstrated.
    No preview · Conference Paper · Jun 2013
  • Meng Zhang · Ruiqi Xue · Hui Yu · Hanwen Luo · Wen Chen
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    ABSTRACT: In this paper, we will consider a coordinated multipoint (CoMP) transmission system which accords with the current Long Term Evolution-Advanced (LTE-A) system and the 5th generation wireless system (5G). This paper will consider two different circumstances, one concerning the condition that transmitters knows exactly which user will be wiretapped; the other concerning the condition that transmitters have no knowledge about the wiretapped user's index. Accordingly, we provide the corresponding precoding strategies and simulation results to verify the effectiveness of our proposed algorithms.
    No preview · Conference Paper · Jun 2013
  • Meng Zhang · Ruiqi Xue · Hui Yu · Hanwen Luo · Wen Chen
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    ABSTRACT: This paper studies the precoder design of a multi-relay multi-user bidirectional networks in which each relay is equipped with multiple antennas. We study the relay precoder design in the case of imperfect channel state information (CSI) and a norm-bounded error model is adopted. Then, we solve the power minimization problem under this scenario. Numerical results demonstrate that the proposed robust precoding algorithm outperforms the non-robust solution.
    No preview · Conference Paper · Jun 2013
  • Kai Ying · Hui Yu · Hanwen Luo
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    ABSTRACT: Green communication receives a growing number of concerns due to the consideration for energy and environment issues. On the other hand, the evolution of mobile and wireless communication also results in heterogeneous Radio Access Technologies (RATs), such as Wi-Fi, UMTS, LTE, CDMA2000 and so on. As a result, energy saving by inter-RAT cooperation has raised significant discussions in both industrial and academical worlds. In this paper, we concentrate on inter-RAT energy saving for multicast services. Moreover, we use Integer Linear Programming to model the problem and propose a distributed algorithm which can efficiently save the energy consumption.
    No preview · Article · May 2013 · IEEE Communications Letters

Publication Stats

542 Citations
45.74 Total Impact Points

Institutions

  • 2001-2015
    • Shanghai Jiao Tong University
      • • Department of Electronic Engineering
      • • Department of Electrical Engineering
      Shanghai, Shanghai Shi, China
  • 2012
    • Shanghai Institute of Technology
      Shanghai, Shanghai Shi, China
  • 2004-2009
    • Shanghai University
      • Department of Electronic Engineering
      Shanghai, Shanghai Shi, China
  • 2005
    • PLA University of Science and Technology
      Peping, Beijing, China