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Onboard Digital Beamformer with Multi-Frequency and Multi-Group Time Delays for High-Resolution Wide-Swath SAR

Wei Xu, Qi Yu, Chonghua Fang, Pingping Huang, Weixian Tan, Yaolong Qi
2021 Remote Sensing  
Scan-on-receive (SCORE) digital beamforming (DBF) in elevation can significantly improve the signal-to-noise ratio (SNR) and suppress range ambiguities in spaceborne synthetic aperture radar (SAR).  ...  The simulation results of both point and distributed targets validate the proposed DBF processor.  ...  Consequently, baseband echoes from all channels are combined by an onboard digital beamforming (DBF) processor to form a high-gain pencil beam to scan the reflected echoes.  ... 
doi:10.3390/rs13214354 fatcat:qttwowuwkfaq7gfp67sxyd2rp4

Reconfigurable Stimulus Generator for Receive Beamformer Test-bed

Khyati R.Zalawadia, Neeraj Mishra, Himanshu Shah, U.D.Dalal U.D.Dalal
2015 International Journal of Computer Applications  
Laboratory testing of digital beamforming processor is required to test and optimize the beamformer algorithm, code and hardware before integrating with antenna and testing the beamformer in an anechoic  ...  The hardware test results are reported  ...  ACKNOWLEDGMENTS The authors wish to acknowledge the contribution of Milind Mahajan of ASG and Pramod, Pratik, Jaydeep, Md. Azhar and Amita Mevada of DTD in this project.  ... 
doi:10.5120/20548-2922 fatcat:r2wpspxh2rcftjdkj3r6pop6te

Efficient Hybrid Beamforming with Anti-Blockage Design for High-Speed Railway Communications

Meilin Gao, Bo Ai, Yong Niu, Wen WU, Peng Yang, Feng Lyu, Xuemin Shen
2020 IEEE Transactions on Vehicular Technology  
is utilized to approximately recover the analog and digital beamformers.  ...  Extensive simulation results are presented to show the sum rate performance of the proposed algorithms under various configurations, including transmission power, velocity of the train, blockage probability  ...  The digital beamforming (DBF) and spatial multiplexing were integrated, which can support concurrent beam connections between multiple ground antenna arrays and multiple onboard antenna arrays.  ... 
doi:10.1109/tvt.2020.3000757 fatcat:x6gqg65355gqhjg3vlhpq2db5q

Spaceborne Reflector SAR Systems with Digital Beamforming

Sigurd Huber, Marwan Younis, Anton Patyuchenko, Gerhard Krieger, Alberto Moreira
2012 IEEE Transactions on Aerospace and Electronic Systems  
Focus is put on DBF algorithms adopted to the SAR case and important performance figures are derived.  ...  The development for future radar satellites is therefore towards digital beamforming (DBF) systems where the analogous receiver hardware is replaced by digital components.  ...  In order to avoid large onboard mass memories a good compromise is to perform DBF in elevation on board and to downlink the resulting azimuth channel signals. B.  ... 
doi:10.1109/taes.2012.6324728 fatcat:qnoggd4u2nadha56d3vp7skaou

Semi-Adaptive Beamforming for OFDM Based Hybrid Terrestrial-Satellite Mobile System

Ammar H. Khan, Muhammad Ali Imran, Barry G. Evans
2012 IEEE Transactions on Wireless Communications  
In pursuit of retaining the benefits of onboard beamforming and to reduce the complexity associated with adaptive processing, we here propose a novel semi-adaptive beamformer for a Hybrid Terrestrial-Satellite  ...  On the other hand, employing adaptive beamforming onboard the satellite gives more flexibility in case of variation in traffic dynamics and also for changing of beam patterns.  ...  Khan would like to thank Centre for Communication Systems Research, UK and National University of Sciences and Technology, Pakistan for supporting him in this work.  ... 
doi:10.1109/twc.2012.083112.110130 fatcat:zdbxzza3dng6lapnvrpie3pip4

Joint Trajectory and Hybrid Beamforming Design for Multi Antenna UAV Enabled Network

Feng Zhou, Rugang Wang
2021 IEEE Access  
Nevertheless, the conventional fully digital beamforming (BF) structure imposes an excessive fabrication cost and energy consumption owing to using numerous costly radio frequency (RF) chains and analog-digital  ...  Finally, simulation results are provided to verify the proposed algorithm.  ... 
doi:10.1109/access.2021.3068289 fatcat:dg2lilhdvngh5j3xspx3g4pcy4

A Novel Real-Time Echo Separation Processing Architecture for Space–Time Waveform-Encoding SAR Based on Elevation Digital Beamforming

Jinsong Qiu, Zhimin Zhang, Zhen Chen, Shuo Han, Wei Wang, Yuhao Wen, Xiangrui Meng, Huaitao Fan
2022 Remote Sensing  
The two-dimensional simulation results indicate that the proposed scheme can effectively improve the performance of echo separation.  ...  To separate the echoes from different directions, traditional schemes adapt single-null steering techniques for digital receive beam patterns.  ...  The total number of real number multipliers consumed by matrices C and C H is given by NUM R MUL = N 2 × (1 + Q) (41) The LCMV beamformer needs to calculate the inverse matrix in real-time onboard.  ... 
doi:10.3390/rs14010213 fatcat:3dyc2sfi2rffrhmwx33zhkpmqu

Smart Small Cell with Hybrid Beamforming for 5G: Theoretical Feasibility and Prototype Results [article]

Jinyoung Jang, MinKeun Chung, Hae Gwang Hwang, Yeon-Geun Lim, Hong-jib Yoon, TaeckKeun Oh, Byung-Wook Min, Yongshik Lee, Kwang Soon Kim, Chan-Byoung Chae, Dong Ku Kim
2016 arXiv   pre-print
This study validates the feasibility of the 3D hybrid beamforming, mostly for link-level performances, through the implementation of a realtime testbed using a software-defined radio (SDR) platform and  ...  In this article, we present a real-time three dimensional (3D) hybrid beamforming for fifth generation (5G) wireless networks.  ...  Hence we adopt a decoupled design of the analog beamforming and the digital beamforming.  ... 
arXiv:1506.09109v2 fatcat:pbnikizmu5gwtpy7cqskfjo5ne

A Survey on Millimeter-Wave Beamforming Enabled UAV Communications and Networking [article]

Zhenyu Xiao, Lipeng Zhu, Yanming Liu, Pengfei Yi, Rui Zhang, Xiang-Gen Xia, Robert Schober
2021 arXiv   pre-print
Finally, we present open issues and promising directions for future research in mmWave beamforming enabled UAV communications and networking.  ...  In this paper, we provide a comprehensive survey on mmWave beamforming enabled UAV communications and networking.  ...  Compared to the fully digital beamforming and hybrid analog-digital beamforming structures, phased array employs pure analog beamforming, which has a low hardware cost and power consumption.  ... 
arXiv:2104.09204v2 fatcat:rbywt5p7uzhhzg3hbc7tnln45q

Multidimensional Waveform Encoding: A New Digital Beamforming Technique for Synthetic Aperture Radar Remote Sensing

Gerhard Krieger, Nicolas Gebert, Alberto Moreira
2008 IEEE Transactions on Geoscience and Remote Sensing  
The combination of this technique with digital beamforming on receive enables a new generation of SAR systems with improved performance and flexible imaging capabilities.  ...  Index Terms-Adaptive radar, along-track interferometry (ATI), ambiguity reduction, digital beamforming, displaced phase centre antenna (DPCA), ground moving target indication (GMTI), high-resolution wide-swath  ...  ACKNOWLEDGMENT The authors would like to thank the anonymous reviewers for their valuable comments and suggestions to improve the readability of this paper.  ... 
doi:10.1109/tgrs.2007.905974 fatcat:ovmmog5dkngtjjoefu6ljc4psu

Microwave Beamforming Networks for Intelligent Transportation Systems [chapter]

Ardavan Rahimian
2012 Intelligent Transportation Systems  
Integration of digital signal processing unit with microwave beamforming network based on the 8×8 Rotman Lens will form a hybrid microwave-digital distributed beamforming network that can be employed in  ...  The inherent capabilities of microwave beamforming networks and techniques together with VANETs complex algorithms and architectures will provide a powerful synergy for intelligent transportation systems  ... 
doi:10.5772/26180 fatcat:usni4uft4rcstabuznew2be4hi

Design considerations of real-time adaptive beamformer for medical ultrasound research using FPGA and GPU

Junying Chen, Alfred C. H. Yu, Hayden K.-H. So
2012 2012 International Conference on Field-Programmable Technology  
The results are evaluated quantitatively in terms of performance and image quality, and qualitatively with respect to ease of system integration and ease of use.  ...  beamformers.  ...  ACKNOWLEDGMENT This work is supported in part by Hong Kong Innovation and Technology Fund (ITS/292/11), and in part by the Research Grants Council of Hong Kong, project GRF 716510.  ... 
doi:10.1109/fpt.2012.6412134 dblp:conf/fpt/ChenYS12 fatcat:spn7toyuvvgalb6oqbaqjh3cma

Fully Decentralized Federated Learning Based Beamforming Design for UAV Communications [article]

Yue Xiao, Yu Ye, Shaocheng Huang, Li Hao, Zheng Ma, Ming Xiao, Shahid Mumtaz
2020 arXiv   pre-print
model for robust beamforming (BF) design in UAV communications, as verified by the numerical simulations.  ...  network and stochastic data collection, while still in fast convergence.  ...  Through numerical results, the proposed algorithm is validated to be both communication and time efficient. II. FULLY DECENTRALIZED FEDERATED LEARNING FRAMEWORK A.  ... 
arXiv:2007.13614v1 fatcat:j4lfhdvq6zenxjftj6j6kb4dfi

Iterative turbo beamforming for orthogonal frequency division multiplexing-based hybrid terrestrial-satellite mobile system

A.H. Khan, M.A. Imran, B.G. Evans
2012 IET Communications  
Thus, in this paper we present a novel three-stage Iterative Turbo Beamforming (ITBF) algorithm for an OFDM based Hybrid Terrestrial-Satellite Mobile System which utilises both pilots and data to perform  ...  Results show that when compared to non-iterative conventional BF, the proposed ITBF exhibits Bit Error Rate Gain (BERG) of up to 2.5 dB with only one iteration.  ...  Due to onboard implementation constraints and less severe satellite channel environment, we employ less complex time-domain BF (Pre-FFT).  ... 
doi:10.1049/iet-com.2010.1133 fatcat:ygdxeicjqbhqfnezwpuwpchti4

Interference and multipath suppression with space-time adaptive beamforming for safety-of-life maritime applications

Manuel Appel, Andreas Iliopoulos, Friederike Fohlmeister, Emilio Pérez Marcos, Manuel Cuntz, Andriy Konovaltsev, Felix Antreich, Michael Meurer
2019 CEAS Space Journal  
The algorithms are capable of suppressing strong RFI and separating highly correlated and even coherent multipath signals, thus achieving a reliable time delay and, therefore, pseudorange estimation performance  ...  A two-stage mitigation algorithm, that tackles multipath and radio frequency interference (RFI), caused by personal privacy devices (PPD) or additive white Gaussian noise (AWGN) interferers is presented  ...  The research leading to the results in this paper is part of the project EMSec (Echzeitdienste für die Maritime Sicherheit Security) and has received funding from the program Research for Civil Security  ... 
doi:10.1007/s12567-019-0236-x fatcat:rd4cff6jgnewnlp545cbzpf43q
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