- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Adaptive AoA and Polarization Estimation for Receiving Polarized mmWave Signals
摘要： This paper proposes a novel hybrid dual-polarized antenna array which exploits two orthogonally-collocated dipoles to capture the full power of a polarized millimeter wave signal. To maximize the received signal-to-noise ratio (SNR), we study the adaptive angle-of-arrival and polarization state estimation, and develop a differential beam tracking algorithm and a cross-correlation-to-power ratio polarization tracking algorithm for interleaved hybrid dual-polarized arrays. Simulation results verify the superior performance of the proposed algorithms, and confirm the significant improvement of SNR obtained by using the proposed array and algorithms.
关键词： angle-of-arrival estimation,Hybrid dual-polarized antenna array,polarization state estimation,mmWave
更新于2025-09-23 15:21:21
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Environmental and Economic Considerations for PV Module End-of-Life Management
摘要： This paper suggests a real-valued sparse representation method using a unitary transformation that can convert complex-valued manifold matrices from uniform circular array into real ones. Because of this transformation, the computational complexity is modi?ed. Simulation results con?rmed the effectiveness of the proposed method with a circular array radar.
关键词： array signal processing,Angle of arrival (AOA),uniform circular array (UCA)
更新于2025-09-23 15:19:57
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Low-Complexity Multiuser Receiver for Massive Hybrid Array mmWave Communications
摘要： In this paper, we study the low complexity reception of multiuser signals in uplink millimeter wave (mmWave) communications using a partially connected hybrid antenna array. Exploiting the mmWave channel property, we propose a low-complexity user-directed multiuser receiver with three novel schemes for allocating subarrays to users. This receiver only requires the knowledge of angles-of-arrival (AoAs) for dominating paths and a small amount of equivalent channel information instead of perfect channel state information. For comparison, we also derive a successive interference cancellation based solution as a performance benchmark. We design two types of reference signals with the channel estimation method to enable efficient and simple estimation for AoA and equivalent baseband channel. Also, we provide analytical results for the performance of AoA estimation, using the lower bounds of mean square errors in line-of-sight dominated mmWave channels. Simulation results validate that the proposed channel estimation method is effective when employed in combination with a zero-forcing equalizer.
关键词： mmWave communications,subarray,angle-of-arrival estimation,Hybrid antenna array,line-of-sight
更新于2025-09-19 17:15:36
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Atomic Vapor Confined in a Nanoscale Geometry: From Mesoscopic to Collective Effects
摘要： Simulation data from a ray-tracing tool applied in specific urban environments in the 28-GHz band suggest that the utilization of arbitrary base station (BS) angles in a directional search procedure may not be of maximum benefit for users located in non-line-of-sight positions, because certain angles restrict the radio frequency illumination to a lower maximum power than from others. An appropriate selection of BS angles offers a potential power level benefit of greater than 2 dB in a defined number of consecutive measurements; however, this performance improvement appears to be conditioned by the severity of the existing street canyon propagation and the probability of the angle used. A simple ray tracing method is proposed to approximately identify the most effective BS angles that avoid power emissions in directions largely blocked by nearby buildings. The results indicate that prior site-specific information may be helpful, particularly for systems using analog beamforming.
关键词： Angle of arrival,millimeter wave,user equipment,ray tracing,non-line-of-sight,base station,radio frequency,beam direction
更新于2025-09-19 17:13:59
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[IEEE 2019 6th NAFOSTED Conference on Information and Computer Science (NICS) - Hanoi, Vietnam (2019.12.12-2019.12.13)] 2019 6th NAFOSTED Conference on Information and Computer Science (NICS) - Alignment Error Mitigation Techniques for Airborne Free-Space Optical Communication Systems
摘要： We present our recent research activities on the mitigation of impacts of angle-of-arrival fluctuations and alignment errors on the performance of free-space optical communication systems. We report on the adaptive beam control technique and wide field-of-view receiver based on multi-core fiber for the transmitter and receiver, respectively.
关键词： pointing errors,Free-space optical communication (FSOC) systems,angle-of-arrival (AoA) fluctuations
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 2nd International Conference on Renewable Energy and Power Engineering (REPE) - Toronto, ON, Canada (2019.11.2-2019.11.4)] 2019 IEEE 2nd International Conference on Renewable Energy and Power Engineering (REPE) - Perovskite solar cells-A futuristic approach
摘要： Simulation data from a ray-tracing tool applied in specific urban environments in the 28-GHz band suggest that the utilization of arbitrary base station (BS) angles in a directional search procedure may not be of maximum benefit for users located in non-line-of-sight positions, because certain angles restrict the radio frequency illumination to a lower maximum power than from others. An appropriate selection of BS angles offers a potential power level benefit of greater than 2 dB in a defined number of consecutive measurements; however, this performance improvement appears to be conditioned by the severity of the existing street canyon propagation and the probability of the angle used. A simple ray tracing method is proposed to approximately identify the most effective BS angles that avoid power emissions in directions largely blocked by nearby buildings. The results indicate that prior site-specific information may be helpful, particularly for systems using analog beamforming.
关键词： Angle of arrival,millimeter wave,user equipment,ray tracing,non-line-of-sight,base station,radio frequency,beam direction
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Rear Heterojunction GaAs Solar Cells With Strain-Balanced GaInAs/GaAsP Quantum Wells
摘要： Simulation data from a ray-tracing tool applied in specific urban environments in the 28-GHz band suggest that the utilization of arbitrary base station (BS) angles in a directional search procedure may not be of maximum benefit for users located in non-line-of-sight positions, because certain angles restrict the radio frequency illumination to a lower maximum power than from others. An appropriate selection of BS angles offers a potential power level benefit of greater than 2 dB in a defined number of consecutive measurements; however, this performance improvement appears to be conditioned by the severity of the existing street canyon propagation and the probability of the angle used. A simple ray tracing method is proposed to approximately identify the most effective BS angles that avoid power emissions in directions largely blocked by nearby buildings. The results indicate that prior site-specific information may be helpful, particularly for systems using analog beamforming.
关键词： Angle of arrival,user equipment,radio frequency,non-line-of-sight,beam direction,base station,millimeter wave,ray tracing
更新于2025-09-19 17:13:59
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[IEEE 2019 16th Canadian Workshop on Information Theory (CWIT) - Hamilton, ON, Canada (2019.6.2-2019.6.5)] 2019 16th Canadian Workshop on Information Theory (CWIT) - Angular MIMO for Underwater Wireless Optical Communications: Channel Modelling and Capacity
摘要： An alternative architecture for imaging multiple-input/multiple-output (MIMO) underwater wireless optical communications (UWOCs) is proposed which relies on the transmission in angle rather than directly in space. The angular MIMO (A-MIMO) system has advantages over conventional underwater MIMO systems (C-MIMO) in that the image magni?cation is invariant to link range, and angular transmission greatly relaxes the alignment requirements of such links. These features are especially important for underwater wireless sensor networks (UWSNs), where the maintaining alignment between underwater vehicles and ?oating sensors nodes may be dif?cult in such dynamic environments. In this paper, we describe the architecture of A-MIMO for underwater channels and numerically characterize it in clear and coastal seawater conditions. For comparison a C-MIMO underwater system with similar parameters is also characterized and the channel capacities for A-MIMO and a C-MIMO are contrasted against link distances and misalignment errors. The numerical results show that A-MIMO maintains the link capacity against the misalignment conditions far better than C-MIMO while using a smaller size transceiver.
关键词： angular MIMO,link capacity,underwater optical wireless communication,misalignment,angle of arrival
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 19th International Conference on Communication Technology (ICCT) - Xi'an, China (2019.10.16-2019.10.19)] 2019 IEEE 19th International Conference on Communication Technology (ICCT) - Fiber-coupling Efficiency for Satellite-to-ground Laser Links with Angle-of-arrival Fluctuations
摘要： In a satellite-to-ground laser communication system, the presence of atmospheric turbulence and residual angle of arrival fluctuations limit the efficiency with which the propagating beam is coupled into a single-mode fiber. Considering the influence of atmospheric turbulence and residual jitter of angle of arrive, the expression of mean-coupling efficiency is handled in the receiver aperture plane in this paper. The optimal design parameter of the optical receiver system in the satellite-to-ground laser links can be obtained by maximize fiber coupling efficiency. Corresponding numerical results based on the expression derived in this paper will be useful in parametric estimation and optimization of optical receiver system.
关键词： fiber coupling,free space optical communication,angle of arrival,atmospheric turbulence
更新于2025-09-16 10:30:52
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[IEEE 2019 Chinese Control And Decision Conference (CCDC) - Nanchang, China (2019.6.3-2019.6.5)] 2019 Chinese Control And Decision Conference (CCDC) - A Kind of Digital Controlled Electro-Optical Switch Power Source with Variable Voltage and Variable Frequency
摘要： This paper suggests a real-valued sparse representation method using a unitary transformation that can convert complex-valued manifold matrices from uniform circular array into real ones. Because of this transformation, the computational complexity is modi?ed. Simulation results con?rmed the effectiveness of the proposed method with a circular array radar.
关键词： array signal processing,Angle of arrival (AOA),uniform circular array (UCA)
更新于2025-09-16 10:30:52