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A general altitude-dependent path loss model for UAV-to-ground millimeter-wave communications Research Articles

Qiuming Zhu, Mengtian Yao, Fei Bai, Xiaomin Chen, Weizhi Zhong, Boyu Hua, Xijuan Ye,zhuqiuming@nuaa.edu.cn,yaomengtian@nuaa.edu.cn,baifei@nuaa.edu.cn,chenxm402@nuaa.edu.cn,zhongwz@nuaa.edu.cn,byhua@nuaa.edu.cn,yexijuan@nuaa.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 6,   Pages 767-776 doi: 10.1631/FITEE.2000497

Abstract: A general empirical (PL) model for air-to-ground (A2G) millimeter-wave (mmWave) channels is proposed in this paper. Different from existing PL models, the new model takes the height factor of unmanned aerial vehicles (UAVs) into account, and divides the propagation conditions into three cases (i.e., line-of-sight, reflection, and diffraction). A map-based deterministic PL prediction algorithm based on the (RT) technique is developed, and is used to generate numerous PL data for different cases. By fitting and analyzing the PL data under different scenarios and UAV heights, model parameters are provided. Simulation results show that the proposed model can be effectively used to predict PL values for both low- and high-altitude cases. The prediction results of the proposed model better match the RT-based calculation results than those of the Third Generation Partnership Project (3GPP) model and the close-in model. The standard deviation of the PL is also much smaller. Moreover, the new model is flexible and can be extended to other A2G scenarios (not included in this paper) by adjusting the parameters according to the simulation or measurement data.

Keywords： 传播损耗；无人机对地信道；毫米波通信信道；射线追踪；高度相关    

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Radio propagation measurement and cluster-based analysis for millimeter-wave cellular systems in dense urban environments

Peize Zhang, Haiming Wang, Wei Hong,pzzhang@seu.edu.cn,hmwang@seu.edu.cn,weihong@seu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4,   Pages 471-487 doi: 10.1631/FITEE.2000489

Abstract: The deployment of millimeter-wave (mmWave) cellular systems in dense urban environments with an acceptable coverage and cost-efficient transmission scheme is essential for the rollout of fifth-generation and beyond technology. In this paper, cluster-based analysis of mmWave channel characteristics in two typical dense urban environments is performed. First, radio campaigns are conducted in two identified mmWave bands of 28 and 39 GHz in a central business district and a dense residential area. The custom-designed channel sounder supports high-efficiency directional scanning sounding, which helps collect sufficient data for statistical channel modeling. Next, using an improved auto- algorithm, multipath clusters and their scattering sources are identified. An appropriate measure for inter- and intra-cluster characteristics is provided, which includes the cluster number, the Ricean -factor, root-mean-squared (RMS) delay spread, RMS angular spread, and their correlations. Comparisons of these parameters across two mmWave bands for both line-of-sight (LoS) and non-light-of-sight (NLoS) links are given. To shed light on the blockage effects, detailed analysis of the propagation mechanisms corresponding to each NLoS cluster is provided, including reflection from exterior walls and over building corners and rooftops. Finally, the results show that the cluster-based analysis takes full advantage of mmWave beamspace channel characteristics and has further implications for the design and deployment of mmWave wireless networks.

Keywords： 毫米波通信；分簇；绕射；多路通道；传播测量    

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Prior information based channel estimation for millimeter-wave massive MIMO vehicular communications in 5G and beyond Research Articles

Zhao Yi, Weixia Zou, Xuebin Sun,yz17tx@bupt.edu.cn,zwx0218@bupt.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 6,   Pages 777-789 doi: 10.1631/FITEE.2000515

Abstract: (mmWave) has been claimed as the viable solution for high-bandwidth s in 5G and beyond. To realize applications in future s, it is important to take a robust mmWave vehicular network into consideration. However, one challenge in such a network is that mmWave should provide an ultra-fast and high-rate data exchange among vehicles or vehicle-to-infrastructure (V2I). Moreover, traditional real-time strategies are unavailable because vehicle mobility leads to a fast variation mmWave channel. To overcome these issues, a approach for mmWave V2I communications is proposed in this paper. Specifically, by considering a fast-moving vehicle secnario, a corresponding mathematical model for a fast channel is first established. Then, the temporal variation rule between the base station and each mobile user and the determined direction-of-arrival are used to predict the channel prior information (PI). Finally, by exploiting the PI and the characteristics of the channel, the channel is estimated. The simulation results show that the scheme in this paper outperforms traditional ones in both normalized mean square error and sum-rate performance in the mmWave vehicular system.

Keywords： 大规模多入多出；毫米波；信道估计；车辆通信；时变    

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Empirical study on directional millimeter-wave propagation in vehicle-to-infrastructure communications between road and roadside

Xichen Liu, Lin Yang, Daizhong Yu,362475709@qq.com,eelyang@uestc.edu.cn,15908107465@163.com

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4,   Pages 503-516 doi: 10.1631/FITEE.2000464

Abstract: With the increased demand for unmanned driving technology and big-data transmission between vehicles, (mmWave) technology, due to its characteristics of large bandwidth and low latency, is considered to be the key technology in future vehicular communication systems. Different from traditional cellular communication, the vehicular communication environment has the characteristics of long distance and high moving speed. However, the existing communication channel tests mostly select low-speed and small-range communication scenarios for testing. The test results are insufficient to provide good data support for the existing vehicular communication research; therefore, in this paper, we carry out a large number of channel measurements in mmWave vehicle-to-infrastructure (V2I) long-distance communication scenarios in the 41 GHz band. We study the received signal strength (RSS) in detail and find that the vibration features of RSS can be best modeled by the modified considering road roughness. Based on the obtained RSS, a novel close-in (CI) model considering the effect of the transmitter (TX) and receiver (RX) antenna heights (CI-TRH model) is developed. As for the channel characteristics, the distribution of the root-mean-square (RMS) delay spread is analyzed. We also extend the two-section exponential (PDP) model to a more general form so that the distance-dependent features of the mmWave channel can be better modeled. Furthermore, the variation in both RMS delay spread and PDP shape parameters with TX-RX distance is analyzed. Analysis results show that TX and RX antenna heights have an effect on large-scale fading. Our modified , CI-TRH model, and two-section exponential PDP model are proved to be effective.

Keywords： 毫米波；两径模型；均方根时延扩展；功率延迟分布；CI-TRH路径损耗模型    

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Modeling and performance analysis of OAM-GSM millimeter-wave wireless communication systems

Qi Zhang, Xusheng Xiong, Qiang Li, Tao Han, Yi Zhong,qiqiz@hust.edu.cn,xiongxusheng@hust.edu.cn,qli_patrick@hust.edu.cn,hantao@hust.edu.cn,yzhong@hust.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4,   Pages 527-547 doi: 10.1631/FITEE.2000444

Abstract: In recent years, the conventional degrees of freedom in frequency and time have been fully used. It is difficult to further improve the performance of communication systems with such degrees of freedom. , which provides a new degree of freedom for millimeter-wave (mmWave) wireless communication systems, has been recognized as a key enabling technique for future mobile communication networks. By combining OAM beams that have theoretically infinite and mutually orthogonal states with the strategy, a new OAM-GSM mmWave wireless communication system is designed in this paper. A model of the OAM-GSM system is established based on channel flip precoding. The , , and BER of the proposed OAM-GSM mmWave wireless communication system are simulated. Numerical results show that, compared with traditional GSM systems, the OAM-GSM system has more complex transmission and reception mechanisms but the and maximum achievable are increased by 80% and 54%, respectively, and the BER drops by 91.5%.

Keywords： 轨道角动量；广义空间调制；毫米波通信；信道容量；能量效率；误比特率    

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Spatial fading channel emulation for over-the-air testing of millimeter-wave radios: concepts and experimental validations

Wei Fan, Lassi Hentilä, Pekka Kyösti,wfa@es.aau.dk

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4,   Pages 548-559 doi: 10.1631/FITEE.2000484

Abstract: Millimeter-wave (mmWave) communication is regarded as the key enabling component for fifth-generation (5G) cellular systems due to the large available spectrum bandwidth. To make mmWave new radio (NR) a reality, tremendous efforts have been exerted from the industry and academia. Performance evaluation of mmWave NR is a mandatory step and the key to ensuring the success of mmWave 5G deployment. Over-the-air (OTA) radiated method of testing mmWave NR in laboratory conditions is highly attractive, since it facilitates virtual field testing of mmWave devices in realistic propagation conditions. In this paper, we first discuss the need for and challenges in OTA measurement of mmWave 5G NR under fading channel conditions. After that, two promising candidate solutions, i.e., wireless cable and multi-probe anechoic chamber (MPAC), are detailed. Their principles, applicability for mmWave NR, and main challenges are discussed. Furthermore, preliminary experimental validation results in a frequency range 2 anechoic chamber are demonstrated for the wireless cable and MPAC methods at 28 GHz.

Keywords： 空间信道模型；空口测试；无线线缆；多探头电波暗室；FR2验证    

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A study of uplink and downlink channel spatial characteristics in an urban micro scenario at 28 GHz

Tao Jiang, Jianhua Zhang, Pan Tang, Lei Tian,jet@bupt.edu.cn,jhzhang@bupt.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4,   Pages 488-502 doi: 10.1631/FITEE.2000443

Abstract: This paper presents an empirical study of the and (AoA) in an urban micro (UMi) scenario at 28 GHz. At present, most UMi measurements are conducted in the and then the situation is inferred assuming channel reciprocity. Although the channel correlation coefficient of the and can be as high as 0.8, this does not mean that they are the same. Only a real measurement can accurately describe its channel conditions, and this is what this study does. A receiver equipped with a rotatable horn antenna is mounted at the base station and the user terminal, respectively, in simulating the and . To improve the angular resolution, we extract the multipath components (MPCs) using the space-alternating generalized expectation-maximization algorithm. Also, a spatial lobe approach is used to cluster the MPCs in the power angular spectrum. By matching MPCs with objects in the environment, we find that direct propagation and first-order reflections are dominant in line-of-sight and non-line-of-sight cases. By comparing our measurement with those in standard channel models, we verify that the AoA of clusters follows a Gaussian distribution in the and . In addition, a two-dimensional Gaussian distribution for ray AoA and power is established to reflect their correlation.

Keywords： 信道测量；毫米波；上行链路；下行链路；水平到达角    

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Machine learning based altitude-dependent empirical LoS probability model for air-to-ground communications Research Article

Minghui PANG, Qiuming ZHU, Zhipeng LIN, Fei BAI, Yue TIAN, Zhuo LI, Xiaomin CHEN

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 9,   Pages 1378-1389 doi: 10.1631/FITEE.2200041

Abstract: Line-of-sight (LoS) probability prediction is critical to the performance optimization of wireless communication systems. However, it is challenging to predict the LoS probability of air-to-ground (A2G) communication scenarios, because the altitude of unmanned aerial vehicles (UAVs) or other aircraft varies from dozens of meters to several kilometers. This paper presents an altitude-dependent empirical LoS probability model for A2G scenarios. Before estimating the model parameters, we design a K-nearest neighbor (KNN) based strategy to classify LoS and non-LoS (NLoS) paths. Then, a two-layer back propagation neural network (BPNN) based parameter estimation method is developed to build the relationship between every model parameter and the UAV altitude. Simulation results show that the results obtained using our proposed model has good consistency with the (RT) data, the measurement data, and the results obtained using the standard models. Our model can also provide wider applicable altitudes than other LoS probability models, and thus can be applied to different altitudes under various A2G scenarios.

Keywords： Line-of-sight probability model     Air-to-ground channel     Machine learning     Ray tracing    

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The Development and Research Synopsis of Large UAV in China

Zhao Xu

Strategic Study of CAE 2003, Volume 5, Issue 1,   Pages 38-41

Abstract:

This paper systematically reviews the history and background of large UAV * s development in China, which includes the first developed simulated target drone, all kinds of substantial pilotless drone and the developing unmanned attack air vehicle. The main technical difficulties and key technologies applied are introduced in detail. The developing journey of all kinds of unmanned air vehicle is formulised. In the end, the importance and development of UCAV in China are also previewed, analysed and plotted.

Keywords： target drone     unmanned air vehicle (UAV)     unmanned combat air vehicle (UCAV)     development     application    

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A collaborative target tracking algorithm for multiple UAVs with inferior tracking capabilities Research Articles

Zhi Zheng, Shuncheng Cai,zhengz@fjnu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 10,   Pages 1334-1350 doi: 10.1631/FITEE.2000362

Abstract: Target tracking is one of the hottest topics in the field of drone research. In this paper, we study the multiple unmanned aerial vehicles () problem. We propose a novel tracking method based on intention estimation and effective cooperation for UAVs with inferior tracking capabilities to track the targets that may have agile, uncertain, and intelligent motion. For three classic target motion modes, we first design a novel trajectory feature extraction method with the least dimension and maximum coverage constraints, and propose an intention estimation mechanism based on the environment and target trajectory features. We propose a novel Voronoi diagram, called MDA-Voronoi, which divides the area with obstacles according to the minimum reachable distance and the minimum steering angle of each UAV. In each MDA-Voronoi region, the maximum reachable region of each UAV is defined, the upper and lower bounds of the trajectory coverage probability are analyzed, and the tracking strategies of the UAVs are designed to effectively reduce the tracking gaps to improve the target sensing time. Then, we use the Nash -learning method to design the UAVs’ collaborative tracking strategy, considering factors such as collision avoidance, maneuvering constraints, tracking cost, sensing performance, and path overlap. By designing the reward mechanism, the optimal action strategies are obtained as the control input of the UAVs. Finally, simulation analyses are provided to validate our method, and the results demonstrate that the algorithm can improve the performance for multiple UAVs with inferior tracking capabilities.

Keywords： 协同跟踪；意图估计；MDA-Voronoi图；多无人机；性能不占优    

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A 39 GHz Dual-Channel Transceiver Chipset With an Advanced LTCC Package for 5G Multi-Beam MIMO Systems Aticle

Yiming Yu,Zhilin Chen,Chenxi Zhao,Huihua Liu,Yunqiu Wu,Wen-Yan Yin,Kai Kang

Engineering 2023, Volume 22, Issue 3,   Pages 125-140 doi: 10.1016/j.eng.2022.04.023

Abstract:

This article presents a 39 GHz transceiver front-end chipset for 5G multi-input multi-output (MIMO) applications. Each chip includes two variable-gain frequency-conversion channels and can support two simultaneous independent beams, and the chips also integrate a local-oscillator chain and digital module for multi-chip extension and gain-state control. To improve the radio-frequency performance, several circuit-level improvement techniques are proposed for the key building blocks in the front-end system. Furthermore, an advanced low-temperature co-fired ceramic process is developed to package the 39 GHz dual-channel transceiver chipset, and it achieves low packaging loss and high isolation between the two transmitting (TX)/receiving (RX) channels. Both the chip-level and system-in-package (SIP)-level measurements are conducted to demonstrate the performance of the transceiver chipset. The measurement characteristics show that the TX SIP provides 11 dB maximum gain and 10 dBm saturated output power, while the RX SIP achieves 52 dB maximum gain, 5.4 dB noise figure, and 7.2 dBm output 1 dB compression point. Single-channel communication link testing of the transceiver exhibits an error vector magnitude (EVM) of 3.72% and a spectral efficiency of 3.25 bit·s−1·Hz−1 for 64-quadrature amplitude modulation (QAM) modulation and an EVM of 3.76% and spectral efficiency of 3.9 bit·s−1·Hz−1 for 256-QAM modulation over a 1 m distance. Based on the chipset, a 39 GHz multi-beam prototype is also developed to perform the MIMO operation for 5G millimetre wave applications. The over-the-air communication link for one- and two-stream transmission indicates that the multi-beam prototype can cover a 5–150 m distance with comparable throughput.

Keywords： 5G     Multi-beam     Multi-input multi-output     Millimeter-wave     Transceiver     Wireless communication    

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Polarizationmultiplexing based duplex radio-over-fiber link for millimeterwave signal transmission to a ring of multiple radio access units None

Tayyab MEHMOOD, Hina QAYYUM, Salman GHAFOOR

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 2,   Pages 300-306 doi: 10.1631/FITEE.1700056

Abstract:

A radio-over-fiber (RoF) distributed antenna system (DAS) architecture is proposed, where millimeter wave (mm-wave) signals are transmitted to four different radio access units (RAUs) arranged in a ring topology. The proposed architecture transmits duplex data of 128 Mb/s to each RAU in both downlink (DL) and uplink (UL) directions. The radio frequency (RF) signals are transmitted by polarization multiplexing a multi-wavelength source. Millimeter-wave signals at a frequency of 25 GHz are generated at each RAU using remote heterodyne detection. The proposed architecture provides increased coverage while maintaining good bit error rate (BER) results.

Keywords： Radio over fiber     Millimeter wave     Radio access units    

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Dynamic value iteration networks for the planning of rapidly changing UAV swarms Research Articles

Wei Li, Bowei Yang, Guanghua Song, Xiaohong Jiang,li2ui2@zju.edu.cn,boweiy@zju.edu.cn,ghsong@zju.edu.cn,jiangxh@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 5,   Pages 615-766 doi: 10.1631/FITEE.1900712

Abstract: In an unmanned aerial vehicle ad-hoc network (UANET), sparse and rapidly mobile unmanned aerial vehicles (UAVs)/nodes can dynamically change the UANET topology. This may lead to UANET service performance issues. In this study, for planning rapidly changing UAV swarms, we propose a dynamic value iteration network (DVIN) model trained using the method with the connection information of UANETs to generate a state value spread function, which enables UAVs/nodes to adapt to novel physical locations. We then evaluate the performance of the DVIN model and compare it with the non-dominated sorting genetic algorithm II and the exhaustive method. Simulation results demonstrate that the proposed model significantly reduces the decision-making time for UAV/node with a high average success rate.

Keywords： 动态值迭代网络；场景式Q学习；无人机自组网；NSGA-II；路径规划    

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Affine formation tracking control of unmanned aerial vehicles Research Articles

Huiming LI, Hao CHEN, Xiangke WANG

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 6,   Pages 909-919 doi: 10.1631/FITEE.2100109

Abstract:

The tracking problem for (UAVs) is considered in this paper, where fixed-wing UAVs are modeled as unicycle-type agents with asymmetrical speed constraints. A group of UAVs are required to generate and track a time-varying target formation obtained by affinely transforming a nominal formation. To handle this problem, a distributed control law based on stress matrix is proposed under the leader-follower control scheme. It is proved, theoretically, that followers can converge to the desired positions and achieve affine transformations while tracking diverse trajectories. Furthermore, a saturated control strategy is proposed to meet the speed constraints of fixed-wing UAVs, and numerical simulations are executed to verify the effectiveness of our proposed tracking control strategy in improving maneuverability.

Keywords： Affine formation     Fixed-wing unmanned aerial vehicles     Multi-agent system    

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UAV search-and-rescue planning using an adaptive memetic algorithm Research Articles

Libin Hong, Yue Wang, Yichen Du, Xin Chen, Yujun Zheng,yujun.zheng@computer.org

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 11,   Pages 1477-1491 doi: 10.1631/FITEE.2000632

Abstract: The use of unmanned aerial vehicles (UAVs) is becoming more commonplace in tasks, but UAV search planning can be very complex due to limited response time, large search area, and multiple candidate search modes. In this paper, we present a UAV search planning problem where the search area is divided into a set of subareas and each subarea has a prior probability that the target is present in it. The problem aims to determine the search sequence of the subareas and the search mode for each subarea to maximize the probability of finding the target. We propose an adaptive that combines a genetic algorithm with a set of local search procedures and dynamically determines which procedure to apply based on the past performance of the procedures measured in fitness improvement and diversity improvement during problem-solving. Computational experiments show that the proposed algorithm exhibits competitive performance compared to a set of state-of-the-art global search heuristics, non-adaptive s, and adaptive s on a wide set of problem instances.

Keywords： 文化基因算法；自适应；无人机；搜救    

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Title Author Date Type Operation

A general altitude-dependent path loss model for UAV-to-ground millimeter-wave communications

Qiuming Zhu, Mengtian Yao, Fei Bai, Xiaomin Chen, Weizhi Zhong, Boyu Hua, Xijuan Ye,zhuqiuming@nuaa.edu.cn,yaomengtian@nuaa.edu.cn,baifei@nuaa.edu.cn,chenxm402@nuaa.edu.cn,zhongwz@nuaa.edu.cn,byhua@nuaa.edu.cn,yexijuan@nuaa.edu.cn

Journal Article

Radio propagation measurement and cluster-based analysis for millimeter-wave cellular systems in dense urban environments

Peize Zhang, Haiming Wang, Wei Hong,pzzhang@seu.edu.cn,hmwang@seu.edu.cn,weihong@seu.edu.cn

Journal Article

Prior information based channel estimation for millimeter-wave massive MIMO vehicular communications in 5G and beyond

Zhao Yi, Weixia Zou, Xuebin Sun,yz17tx@bupt.edu.cn,zwx0218@bupt.edu.cn

Journal Article

Empirical study on directional millimeter-wave propagation in vehicle-to-infrastructure communications between road and roadside

Xichen Liu, Lin Yang, Daizhong Yu,362475709@qq.com,eelyang@uestc.edu.cn,15908107465@163.com

Journal Article

Modeling and performance analysis of OAM-GSM millimeter-wave wireless communication systems

Qi Zhang, Xusheng Xiong, Qiang Li, Tao Han, Yi Zhong,qiqiz@hust.edu.cn,xiongxusheng@hust.edu.cn,qli_patrick@hust.edu.cn,hantao@hust.edu.cn,yzhong@hust.edu.cn

Journal Article

Spatial fading channel emulation for over-the-air testing of millimeter-wave radios: concepts and experimental validations

Wei Fan, Lassi Hentilä, Pekka Kyösti,wfa@es.aau.dk

Journal Article

A study of uplink and downlink channel spatial characteristics in an urban micro scenario at 28 GHz

Tao Jiang, Jianhua Zhang, Pan Tang, Lei Tian,jet@bupt.edu.cn,jhzhang@bupt.edu.cn

Journal Article

Machine learning based altitude-dependent empirical LoS probability model for air-to-ground communications

Minghui PANG, Qiuming ZHU, Zhipeng LIN, Fei BAI, Yue TIAN, Zhuo LI, Xiaomin CHEN

Journal Article

The Development and Research Synopsis of Large UAV in China

Zhao Xu

Journal Article

A collaborative target tracking algorithm for multiple UAVs with inferior tracking capabilities

Zhi Zheng, Shuncheng Cai,zhengz@fjnu.edu.cn

Journal Article

A 39 GHz Dual-Channel Transceiver Chipset With an Advanced LTCC Package for 5G Multi-Beam MIMO Systems

Yiming Yu,Zhilin Chen,Chenxi Zhao,Huihua Liu,Yunqiu Wu,Wen-Yan Yin,Kai Kang

Journal Article

Polarizationmultiplexing based duplex radio-over-fiber link for millimeterwave signal transmission to a ring of multiple radio access units

Tayyab MEHMOOD, Hina QAYYUM, Salman GHAFOOR

Journal Article

Dynamic value iteration networks for the planning of rapidly changing UAV swarms

Wei Li, Bowei Yang, Guanghua Song, Xiaohong Jiang,li2ui2@zju.edu.cn,boweiy@zju.edu.cn,ghsong@zju.edu.cn,jiangxh@zju.edu.cn

Journal Article

Affine formation tracking control of unmanned aerial vehicles

Huiming LI, Hao CHEN, Xiangke WANG

Journal Article

UAV search-and-rescue planning using an adaptive memetic algorithm

Libin Hong, Yue Wang, Yichen Du, Xin Chen, Yujun Zheng,yujun.zheng@computer.org

Journal Article