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  25 December 2018, Volume 3 Issue 4 Previous Issue   
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Special Focus:UAV Communications
Survey of Safety Management Approaches to Unmanned Aerial Vehicles and Enabling Technologies COLLECTION
Zhang Xuejun.,Du Yanshuang.,Gu Bo.,Xu Guoqiang.,Xia Yongxiang.
Journal of Communications and Information Networks. 2018, 3 (4): 1-14.   DOI: 10.1007/s41650-018-0038-x

Unmanned aerial vehicle(UAV)has a rapid development over the last decade.However,an increasing number of severe flight collision events caused by explosive growth of UAV have drawn widespread concern.It is an important issue to investigate safety management approaches of UAVs to ensure safe and efficient operation.In this paper,we present a comprehensive overview of safety management approaches in large,middle and small scales.In large-scale safety management,path-planning problem is a crucial issue to ensure safety and ordered operation of UAVs globally.In middle-scale safety management,it is an important issue to study the conflict detection and resolution methods.And in small-scale safety management,real-time collision avoidance is the last line of ensuring safety.Moreover,a UAV can be regarded as a terminal device connected through communication and information network.Therefore,the enabling technologies,such as sensing,command and control communication,and collaborative decision-making control technology,have been studied in the last.

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New Deterministic and Stochastic Simulation Models for UAV-MIMO Ricean Fading Channels COLLECTION
>Zhang Xi.,Cheng Xiang.
Journal of Communications and Information Networks. 2018, 3 (4): 15-22.   DOI: 10.1007/s41650-018-0033-2

For the practical simulation and performance evaluation of unmanned aerial vehicle (UAV) multiple-input multiple-output (MIMO) Ricean fading channels,it is desirable to develop accurate UAV-MIMO channel simulation models for more realistic scenarios of non-isotropic scattering.In this study,using a twocylinder reference model to describe the distribution of scatterers,we propose new deterministic and stochastic simulation models.Analytical and numerical results indicate that both simulation models provide good approximations to the desired statistical properties of the reference model,and the stochastic simulation model results in a better performance under comparable computational complexity.

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UAV-Aided Networks for Emergency Communications in Areas with Unevenly Distributed Users COLLECTION
Peng Gaozhao.,Xia Yongxiang.,Zhang Xuejun.,Bai Lin.
Journal of Communications and Information Networks. 2018, 3 (4): 23-32.   DOI: 10.1007/s41650-018-0034-1

Nowadays,daily human life is closely intertwined with various networks.When natural disasters or malicious attacks break out,the failure of communication infrastructure due to direct destruction or indirect impact tends to cause a massive outage of communications.Emergency communication networks play a significant role in rescue operations.Recently,a flexible and efficient solution has been provided for emergency communications using unmanned aerial vehicles(UAVs).By means of their excellent characteristics,UAVs,serving as aerial base stations (ABSs),can be rapidly deployed to temporarily rebuild a damaged communication network to restore the users’ connectivity.In this study,we investigate the use of UAVs as ABSs for an emergency communication scene where user equipment is unevenly distributed and the communication infrastructure has completely failed due to a severe disaster.Effective communication probability(ECP),which integrates throughput coverage and connectivity,is used to evaluate the performance of a communication network.Through simulations,we analyze communication improvements that can be obtained by the flexible deployment of ABSs.The results show a noticeable increase in ECP when some ABSs are deployed in optimal locations.

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Energy Optimization for Cellular-Connected Multi-UAV Mobile Edge Computing Systems with Multi-Access Schemes COLLECTION
Hua Meng.,Huang Yongming.,Wang Yi.,Wu Qingqing.,Dai Haibo.,Yang Lyuxi.
Journal of Communications and Information Networks. 2018, 3 (4): 33-44.   DOI: 10.1007/s41650-018-0035-0

In this paper,a cellular-connected unmanned aerial vehicle (UAV) mobile edge computing system is studied where several UAVs are associated to a terrestrial base station(TBS)for computation offloading.To compute the large amount of data bits,a part of computation task is migrated to TBS and the other part is locally handled at UAVs.Our goal is to minimize the total energy consumption of all UAVs by jointly adjusting the bit allocation,power allocation,resource partitioning as well as UAV trajectory under TBS’s energy budget.For deeply comprehending the impact of multi-UAV access strategy on the system performance,four access schemes in the uplink transmission is considered,i.e.,time division multiple access,orthogonal frequency division multiple access,one-by-one access and non-orthogonal multiple access.The involved problems under different access schemes are all formulated in non-convex forms,which are difficult to be tackled optimally.To solve this class of problem,the successive convex approximation technique is employed to obtain the suboptimal solutions.The numerical results show that the proposed scheme save significant energy consumption compared with the benchmark schemes.

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Timing Synchronization and Ranging in Networked UAV-Aided OFDM Systems COLLECTION
Yan Chaoxing.,Wang Jingjing.,Fu Lingang.,Jiang Chunxiao.,Chen Ming.,Ren Yong.
Journal of Communications and Information Networks. 2018, 3 (4): 45-54.   DOI: 10.1007/s41650-018-0037-y

The space-air-ground network architecture integrates satellite systems,aerial networks,and terrestrial networks,where the unmanned aerial vehicle(UAV) communication in the air segment has attracted particular interest and demonstrated tremendous potential in both military and civilian applications.Orthogonal frequency division multiplexing(OFDM)can be an effective solution to provide high rate and reliable transmission in UAV communication systems because of its high spectral efficiency and robustness against frequency selective fading.We herein focus our attention on two critical issues in our proposed UAV aided OFDM system,i.e.,timing synchronization and ranging.Moreover,extensive simulations are conducted for evaluation.Finally,we design a real-world field test for verifying the effectiveness of our proposed multi-UAV OFDM communication system.

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Coverage Optimization for UAV-Aided Internet of Things with Partial Channel Knowledge COLLECTION
Wang Xuanxuan.,Feng Wei.,Chen Yunfei.,Ge Ning.
Journal of Communications and Information Networks. 2018, 3 (4): 55-63.   DOI: 10.1007/s41650-018-0039-9

Due to the high maneuverability of unmanned aerial vehicles (UAVs),they have been widely deployed to boost the performance of Internet of Things (IoT).In this paper,to promote the coverage performance of UAV-aided IoT communications,we maximize the minimum average rate of the IoT devices by jointly optimizing the resource allocation strategy and the UAV altitude.Particularly,to depict the practical propagation environment,we take the composite channel model including both the small-scale and the large-scale channel fading into account.Due to the difficulty in acquiring the random small-scale channel fading,we assume that only the large-scale channel sate information is available.On this basis,we formulate an optimization problem,which is not convex and challenging to solve.Then,an efficient iterative algorithm is proposed using block coordinate descent and successive convex optimization tools.Finally,simulation results are presented to demonstrate the significant performance gain of the proposed scheme over existing ones.

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Placement Optimization for UAV-Enabled Wireless Networks with Multi-Hop Backhauls COLLECTION
Li Peiming.,Xu Jie.
Journal of Communications and Information Networks. 2018, 3 (4): 64-73.   DOI: 10.1007/s41650-018-0040-3

Unmanned aerial vehicles (UAVs) have emerged as a promising solution to provide wireless data access for ground users in various applications (e.g.,in emergency situations).This paper considers a UAVenabled wireless network,in which multiple UAVs are deployed as aerial base stations to serve users distributed on the ground.Different from prior works that ignore UAVs’backhaul connections,we practically consider that these UAVs are connected to the core network through a ground gateway node via rate-limited multi-hop wireless backhauls.We also consider that the air-to-ground access links from UAVs to users and the air-to-air backhaul links among UAVs are operated over orthogonal frequency bands.Under this setup,we aim to maximize the common (or minimum) throughput among all the ground users in the downlink of this network subject to the flow conservation constraints at the UAVs,by optimizing the UAVs’ deployment locations,jointly with the bandwidth and power allocation of both the access and backhaul links.However,the common throughput maximization is a non-convex optimization problem that is difficult to be solved optimally.To tackle this issue,we use the techniques of alternating optimization and successive convex programming to obtain a locally optimal solution.Numerical results show that the proposed design significantly improves the common throughput among all ground users as compared to other benchmark schemes.

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Research papers
Hybrid Precoding Design Achieving Fully Digital Performance for Millimeter Wave Communications COLLECTION
Yang Lu.,Zhang Wei.
Journal of Communications and Information Networks. 2018, 3 (4): 74-84.   DOI: 10.1007/s41650-018-0032-3

As a promising candidate for millimeter wave (mmWave) multiple-input and multiple-output (MIMO) communications,hybrid precoding techniques can reap the benefit of large antenna arrays,yet with only limited number of radio frequency(RF)chains.In this paper,we investigate the problem of achieving the same performance of the fully digital system with hybrid precoding.Specifically,for the single user MIMO system,we propose a closed form hybrid precoding design that can achieve the optimal fully digital performance for both frequency-flat and frequency-selective channels,and only requires the number of RF chains to equal the number of paths of the channel.The design for the case with even less RF chains is also given.Furthermore,for the multiuser (MU) system with single antenna at each mobile terminal(MT),two MU beamforming schemes are considered,which are the directional beamforming and zero-forcing.We show that for both schemes,the fully digital performance can be achieved with our proposed hybrid precoding designs with the number of RF chains no less than the sum number of channel paths from the base station to all the selected MTs.Numerical results are provided to validate our analytical results and show the performance gain of the proposed hybrid precoding designs compared to other benchmark schemes.

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Concentric UCAs Based Low-Order OAM for High Capacity in Radio Vortex Wireless Communications COLLECTION
Jing Haiyue.,Cheng Wenchi.,Li Zan.,Zhang Hailin.
Journal of Communications and Information Networks. 2018, 3 (4): 85-100.   DOI: 10.1007/s41650-018-0036-z

Due to the potential capacity-boosting for wireless communications,radio vortex wireless communication (RowComm) over orthogonal states/modes of orbital angular momentum (OAM) has been paid much attention to in recent years.A uniform circular array (UCA),as an efficient and convenient antenna structure,can transmit/receive multiple OAM beams with different OAM-modes simultaneously when the transmitter and receiver are aligned.However,for high-order OAMmodes,the OAM beams are divergent accompanied by severe attenuation.Thus,it is difficult to directly use high-order OAM-modes to achieve high capacity for RowComms.To obtain high capacity potentially offered by OAM-modes,in this paper we transform the singular UCA into the concentric UCAs,where high capacity can be achieved using multiple parallel low-order OAM-modes instead of all high-order OAM-modes,to increase the capacity of transmitter-receiver aligned RowComms.In particular,we study two cases:1).concentric UCAs based RowComms without co-mode interference;2).concentric UCAs based RowComms with co-mode interference.We propose a co-mode-interference-free and a co-mode-interference-contained mode-decomposition schemes to recover transmitted signals for these two cases,respectively.Additionally,we develop optimal power allocation schemes to maximize the capacity for these two cases.Numerical simulations are presented to validate and evaluate that our developed concentric UCAs based low-order RowComms can significantly increase the capacity as compared with that of singular UCA based RowComms.

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Novel Technique in Multihop Environment for Efficient Emergency Message Dissemination and Lossless Video Transmission in VANETS COLLECTION
More Shivaprasad.,Naik Udaykumar.
Journal of Communications and Information Networks. 2018, 3 (4): 101-111.   DOI: 10.1007/s41650-018-0017-2

Vehicular ad hoc networks (VANETs) support safety- and non-safety-related applications that require the transmission of emergency safety messages and periodic beacon messages.The dedicated short-range communication (DSRC) standard in VANETs is used to exchange safety messages,and is involved in multi-hop data dissemination and routing.Many researchers have focused either on emergency data dissemination or routing,but both are critical.Routing protocols are commonly used for position-based routing and distancebased routing.This paper focuses on both emergency data dissemination and multi-hop routing,with the selection of the best data disseminator and trustworthy forwarder.To select the best forwarder,ring partitioning is performed,which segregates vehicles into rings based on the coverage area for routing.Each partition is selected with a best forwarder,which minimizes the hop count for data transmission.The work also includes effective video transmission for a user’s request.Video transmission in VANETs is involved in this work to provide efficient video delivery between rapidly travelling vehicles with reduced delay owing to the selection of good-quality channels.Video transmission is prioritized according to frame types,and they are then transmitted with respect to the preference of channels.The major issue in video streaming is the loss of packets,which is our focus to minimize it.Our proposed VANET environment is simulated in OMNeT++,and the results show remarkable improvements in terms of the packet delivery ratio,end-to-end delay,and reliability.

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Bandwidth Allocation and Control Message Scheduling Algorithms for Improving the QoSs of High Priority Traffic in PON COLLECTION
Rahman Mohammad.Mahbubur.,Hossen Monir.
Journal of Communications and Information Networks. 2018, 3 (4): 112-120.   DOI: 10.1007/s41650-018-0031-4

The passive optical network (PON) is the most promising candidate for supporting multiple service classes,i.e.,high priority (HP) traffic and best-effort (BE) traffic,in the next-generation broadband access networks.Providing an efficient dynamic bandwidth allocation (DBA) algorithm is the most important issue for supporting multiple service classes of traffic simultaneously.This paper presents a new DBA algorithm,which is the modified version of the hybrid slot-size/rate(HSSR) scheme,and is called the modified HSSR (MHSSR) algorithm.We have also modified the control message scheduling algorithm to fit it to the proposed scheme.In the proposed MHSSR scheme,each cycle time,i.e.,the length of a time cycle,is equally divided into two parts.In the 1st part of the cycle time,the bandwidth is dynamically allocated to the HP traffic of all the optical network units (ONUs).In contrast,in the 2nd part of the cycle time,the bandwidth is dynamically allocated to the BE traffic of one or multiple ONUs.Furthermore,to ensure guaranteed service for the HP traffic,the 1st part of the cycle time is extended while the 2nd part of the cycle time is compressed if the demand of the HP traffic is very high.However,the 1st part of the cycle time will never be compressed,even at the lightly loaded condition of the HP traffic.The modified control message-scheduling algorithm effectively coordinates the timing sequence between the two parts of the cycle time and ensures the synchronization between two Gate messages to each ONU.We have evaluated the performance of the proposed schemes through numerical simulations in terms of endto-end packet delay,bandwidth wastage,remaining bytes per time cycle,jitter,and throughput for different offered loads.From the comparative analysis,it can be seen that the proposed scheme provides better performance than the existing HSSR and delay variation-guaranteed schemes.

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» Survey of wireless big data COLLECTION
  Qian Lijun,Zhu Jinkang,Zhang Sihai
  Journal of Communications and Information Networks. 2017 Vol. 2 (1): 1-18 (1781)
» Overview of 5G modulation and waveforms candidates COLLECTION
  Maziar NEKOVEE,Yue WANG,Milos TESANOVIC,Shangbin WU,Yinan QI,Mohammed AL-IMARI
  Journal of Communications and Information Networks. 2016 Vol. 1 (1): 44-60 (1547)
» Architecture and key technologies for Internet of Vehicles:a survey COLLECTION
  Yang Fangchun,Li Jinglin,Lei Tao,Wang Shangguang
  Journal of Communications and Information Networks. 2017 Vol. 2 (2): 1-17 (1005)
» On the architecture and development life cycle of secure cyber-physical systems COLLECTION
  Cong SUN,Jianfeng MA,Qingsong YAO
  Journal of Communications and Information Networks. 2016 Vol. 1 (4): 1-21 (943)
通信与信息网络学报
· The path to 5G:mmWave aspects COLLECTION [2016, No.2:1-18] (576)
· Survey of wireless big data COLLECTION [2017, No.1:1-18] (553)
· Overview of 5G modulation and waveforms candidates COLLECTION [2016, No.1:44-60] (520)
· mmWave mobile communication under hypercellular architecture COLLECTION [2016, No.2:62-76] (496)
· Software defined Internet of vehicles:architecture, challenges and solutions COLLECTION [2016, No.1:14-26] (457)
· On the architecture and development life cycle of secure cyber-physical systems COLLECTION [2016, No.4:1-21] (440)
· Wireless big data:transforming heterogeneous networks to smart networks COLLECTION [2017, No.1:19-32] (384)
· Study of propagation characteristics of outdoor-to-indoor channel in the 60-GHz band COLLECTION [2016, No.2:93-101] (364)
· Architecture and critical technologies of space information networks COLLECTION [2016, No.3:1-9] (351)
· A survey of routing techniques for satellite networks COLLECTION [2016, No.4:66-85] (324)
· A cost-effective SCTP extension for hybrid vehicular networks COLLECTION [2017, No.2:18-29] (309)
· QoS-aware interference management for vehicular D2D relay networks COLLECTION [2017, No.2:75-90] (305)
· An adaptive channel estimation algorithm for millimeter wave cellular systems COLLECTION [2016, No.2:37-44] (303)
· Analysis and prediction of 100 km-scale atmospheric duct interference in TD-LTE networks COLLECTION [2017, No.1:66-80] (302)
· Architecture and key technologies for Internet of Vehicles:a survey COLLECTION [2017, No.2:1-17] (292)
· Link level performance comparison between LTE V2X and DSRC COLLECTION [2017, No.2:101-112] (288)
· Adaptive beaconing for collision avoidance and tracking accuracy in vehicular networks COLLECTION [2017, No.2:30-45] (279)
· Optimal power allocation for downlink two-user non-orthogonal multiple access in visible light communication COLLECTION [2017, No.4:57-64] (279)
· A survey of privacy protection techniques for mobile devices COLLECTION [2016, No.4:86-92] (277)
· Low-complexity factor-graph-based MAP detector for f ilter bank multicarrier systems COLLECTION [2016, No.3:10-22] (271)
· Secure searchable encryption: a survey COLLECTION [2016, No.4:52-65] (270)
· Technical challenges for high-frequency wireless communication COLLECTION [2016, No.2:19-28] (268)
· Securing acoustics-based short-range communication systems: an overview COLLECTION [2016, No.4:44-51] (266)
· Millimeter wave receive beamforming with one-bit quantization COLLECTION [2016, No.2:84-92] (264)
· Wireless channel feature extraction via GMM and CNN in the tomographic channel model COLLECTION [2017, No.1:41-51] (262)
· Privacy-friendly spatial crowdsourcing in vehicular networks COLLECTION [2017, No.2:59-74] (260)
· MMSE-based random sampling for iterative detection for large-scale MIMO systems COLLECTION [2016, No.2:29-36] (255)
· Smart data deduplication for telehealth systems in heterogeneous cloud computing COLLECTION [2016, No.4:93-104] (253)
· Enhancing physical-layer security via big-dataaided hybrid relay selection COLLECTION [2017, No.1:97-110] (250)
· Cluster-based architecture and network model for InterPlaNetary Internet COLLECTION [2016, No.3:51-66] (249)
2018
Vol.3
No.3 
2018-09-25
pp.1-108
No.2
2018-06-25
pp.1-92
No.1
2018-01-25
pp.1-90
2017
Vol.2
No.4 
2017-12-25
pp.1-150
No.3
2017-09-25
pp.1-130
No.2
2017-06-25
pp.1-146
No.1
2017-03-25
pp.1-110
2016
Vol.1
No.4 
2016-12-25
pp.1-155
No.3
2016-09-25
pp.1-114
No.2
2016-06-25
pp.1-124
No.1
2016-03-25
pp.1-142

 
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