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- 摘要
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- 实验方案
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[IEEE 2018 21st Saudi Computer Society National Computer Conference (NCC) - Riyadh, Saudi Arabia (2018.4.25-2018.4.26)] 2018 21st Saudi Computer Society National Computer Conference (NCC) - Millimeter Wave Switching in Radio over Fiber Networks using Semiconductor Optical Amplifier (SOA)
摘要： 5G wireless communication systems promise efficient spectrum utilization, advanced modulation and access techniques, and high data rate. To obtain these requirements, millimeter wave (MMW) signals and subsystems are the most suitable to be used. The Modules and devices, proposed for these networks, are intended to use the efficient capabilities of photonic technologies. In this paper, a photonics-based millimeter wave switch, for orthogonal frequency division multiplexing (OFDM) signals, is proposed by exploiting the nonlinear effects in semiconductor optical amplifiers (SOAs). This includes four wave mixing (FWM), self-phase modulation (SPM) and cross-gain modulation (XGM). A 10 Gbps/16QAM-OFDM signal carried over 30 GHz MMW carrier is considered for signal switching. Moreover, we studied the up- and down- wavelength conversion schemes, in terms of probe and pump signal’s power. Furthermore, we investigate the effects of SOA’s injection current and wavelength spacing between the two injected beams that enable optical single sideband (OSSB) generation and switching. Simulation results show possibility of transmitting and switching OFDM signal with 1×10-3 and 13 % rms symbol error rate (SER) and error vector magnitude (EVM), at -22 dBm received power. The simulation is carried out using Virtual Photonic Integrated (VPI) software.
关键词： optical single side band (OSSB),orthogonal frequency division multiplexing (OFDM),millimeter waves (MMW),semiconductor optical amplifier (SOA),wavelength conversion,5G
更新于2025-09-23 15:23:52
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Joint Optimal Transceiver Placement and Resource Allocation Schemes for Redirected Cooperative Hybrid FSO/mmW 5G Fronthaul Networks
摘要： To meet the requirements of the 5G mobile network, a new innovative approach called centralized radio access network (C-RAN) architecture is introduced. In C-RAN architecture, the fronthaul network must provide high capacity, high availability, and low latency to be able to transmit massive traffic between remote radio heads (RRHs) and baseband processing units. In this paper, two joint transceiver placement and resource allocation schemes are proposed for redirected cooperative hybrid free-space optics (FSO)/millimeter-wave (mmW) fronthaul networks. The schemes aim to obtain the optimal FSO/mmW transceiver placement that optimizes reliability, average transmitted power, average bit error rate (BER), and number of disrupted links of redirected cooperative hybrid FSO/mmW fronthaul networks in various weather conditions. The schemes are formulated as multiobjective and bilevel integer linear programming problems and solved by using an exhaustive search method to obtain optimal solutions. The numerical results reveal that improvements are obtained in the network reliability, average transmitted power, and average BER by implementing the optimal placement, especially at low visibility and/or high rainfall rate conditions.
关键词： C-RAN,FSO,5G,mmW,Optimal transceiver placement,RRH,Resource allocation,BBU
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE Photonics Conference (IPC) - Reston, VA (2018.9.30-2018.10.4)] 2018 IEEE Photonics Conference (IPC) - High-Power Photonic Phased Array Antennas
摘要： We review recent work on a new antenna concept— the high-power photonic phased array. By integrating high-power photodiodes proximal to the transmit aperture’s radiating elements, dense, lightweight, and broadband array designs are realized. Several manifestations of this idea are discussed, emphasizing different application-specific design choices.
关键词： RF photonics,ultra-wideband (UWB),photonic antenna,phased array antenna,5G,high-power photodiode,millimeter wave (mmW)
更新于2025-09-23 15:22:29
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Study of Polarization Strategy for High Power Millimeter Wave with Two Identical Reflective Gratings
摘要： For high-power millimeter systems, re?ective gratings (RGs) are usually used to control the wave polarization. This paper presents the polarization strategy with two identical RGs. We use the coordinate transformation method for the RG design. A code based on this method is checked by numerical examples and also low-power experiments. Experiments are carried out at frequencies of 60, 70, and 105 GHz. Four gratings are manufactured for test. We present and compare calculated results of the coordinate transformation method with the numerical results of the integral method and low-power test results. The comparison results indicate that the calculation results of the code are accurate and reliable. Finally, the polarization strategy with two identical RGs is studied with the code. Parameters and polarization characteristics including the bandwidth of designed gratings are given.
关键词： optical polarization,Gratings,millimeter-wave (mmW) technology
更新于2025-09-23 15:21:21
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LASERAKUPUNKTUR a?? MODERNE LICHTTHERAPIE IN VERBINDUNG MIT JAHRTAUSENDE ALTER CHINESISCHER MEDIZIN; Laser acupuncture a?? modern light therapy in combination with the treasures of ancient chinese medicine;
摘要： The clinical efficacy of LLLT has been scientifically proven in many randomized controlled studies: wound healing disorders, oral mucositis, stroke, traumatic brain injury, nerve regeneration, age-related macular degeneration and much more. Mitochondrial medicine, laser acupuncture and LLLT combine the treasures of modern physical and physiological methods in a unique way for the benefit of our patients. LLLT means targeted mitochondrial medicine.
关键词： laser,auricular medicine,VAS,chinese medicine,resonance therapy,LLLT,cytochrome C oxidase,laser acupuncture,ROS,Weber meridian massage,COO,RAC,PBM,copper,MMW,NIR,mitochondria,coenzyme Q10
更新于2025-09-23 15:21:01
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[IEEE 2018 11th Global Symposium on Millimeter Waves (GSMM) - Boulder, CO, USA (2018.5.22-2018.5.24)] 2018 11th Global Symposium on Millimeter Waves (GSMM) - High-Resolution Antenna Near-Field Imaging and Sub-THz Measurements with a Small Atomic Vapor-Cell Sensing Element
摘要： Atomic sensing and measurement of millimeter-wave (mmW) and THz electric fields using quantum-optical EIT spectroscopy of Rydberg states in atomic vapors has garnered significant interest in recent years towards the development of atomic electric-field standards and sensor technologies. Here we describe recent work employing small atomic vapor cell sensing elements for near-field imaging of the radiation pattern of a Ku-band horn antenna at 13.49 GHz. We image fields at a spatial resolution of λ/10 and measure over a 72 to 240 V/m field range using off-resonance AC-Stark shifts of a Rydberg resonance. The same atomic sensing element is used to measure sub-THz electric fields at 255 GHz, an increase in mmW-frequency by more than one order of magnitude. The sub-THz field is measured over a continuous ±100 MHz frequency band using a near-resonant mmW atomic transition.
关键词： atom,microwave,electric field,metrology,quantum sensing,millimeter-wave,THz,antenna,mmW,Rydberg,terahertz,Atomic sensors,antenna characterization
更新于2025-09-19 17:15:36
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[IEEE 2019 49th European Microwave Conference (EuMC) - Paris, France (2019.10.1-2019.10.3)] 2019 49th European Microwave Conference (EuMC) - A 60GHz Wideband Antenna Array Based on Metasurface with Gap Waveguide (GWG) Divider
摘要： A wideband metasurface excited by a 1×2 slot array coupled to a gap waveguide (GWG) is presented. To enhance the matching bandwidth and gain of slot array, quasi-TM30 mode is introduced by 3×3 subwavelength patch matrices. A low cost GWG divider is optimized to obtain low transmission loss, in which electromagnetic bandgap structures are placed on both sides of transmission line. The antenna array is fabricated based on Rogers 4350b.The simulated -10 dB |??????| is from 49.3 GHz to 65 GHz (27%), the measured one is from 48.5 GHz to 64.8 GHz, covering 57 GHz-64 GHz mmW unlicensed band. The maximum gain is 11.8 dB over matching bandwidth.
关键词： mmW antenna array,metasurface,gap waveguide
更新于2025-09-16 10:30:52
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Additively Manufactured Dielectric Waveguides for Advanced Concepts for Millimeter-Wave Interconnects
摘要： Technology mega trends, such as autonomous driving, multiple-input multiple-output (MIMO), or multi-gigabit communication, drastically increase the demand for ultra-broadband millimeter-wave (mmW) transmission line technologies. A broadband and robust signal and data transmission between components and modules at low cost is a mandatory requirement to ensure high-performance functionality of advanced communication and radar systems. Dielectric waveguides (DWGs) are a highly suitable technology to meet these requirements due to their outstanding transmission capabilities for mmW signals coupled with their high flexibility, low weight, and low cost. Additive manufacturing (AM) processes based on dielectric materials open up new perspectives for fully automated wiring of mmW modules and systems, and they enable cost-efficient application-specific solutions. In this article, we propose novel printed DWG designs with optimized transmission performance. Measurement results of different DWG designs demonstrate the excellent functionality of the proposed transmission line and interconnection concepts. These results and the shown resiliency and practicality of the presented approaches illustrate attractive opportunities for new interconnect technologies based on new manufacturing processes.
关键词： transmission line measurements,Dielectric materials,millimeter-wave (mmW) measurements,waveguides (WGs)
更新于2025-09-16 10:30:52
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[IEEE 2019 XIth International Scientific and Practical Conference on Electronics and Information Technologies (ELIT) - Lviv, Ukraine (2019.9.16-2019.9.18)] 2019 XIth International Scientific and Practical Conference on Electronics and Information Technologies (ELIT) - Computational-Measurement System a??Nanoplasmonicsa??. Part 2: Structure of Microservices
摘要： Ray tracing simulation results indicate that a high-resolution database is not needed to exploit user position knowledge in the 28-GHz band, even in the case of inexact information. A proposed antenna alignment algorithm (using maximum position errors and database resolutions of 10 and 4 m, respectively) that takes advantage of the propagation characteristics knowledge of database points located around the reported location is applied. The results show that the distance between the points can be increased up to 2 m with no considerable negative impact on performance. Simulations also indicate that this outcome is sustained when the maximum power level received at the user equipment varies. The algorithm provides the benefit of a higher initial power delivery and fewer steps, as long as the exact geographical position of the user is within the circular area containing the considered database points. The performance is similar to or better than that of a modified classical hierarchical procedure.
关键词： Base station (BS),database (DB),non-line of sight (NLOS),millimeter wave (mmW),ray tracing (RT),user equipment (UE),signal-to-noise ratio (SNR)
更新于2025-09-16 10:30:52
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Compact silicon-micromachined wideband 220-330 GHz turnstile orthomode transducer
摘要： This paper reports on a turnstile-junction orthomode transducer (OMT) implemented by silicon micromachining in the 220 – 330 GHz band. Turnstile OMTs are very wideband and allow for co-planar ports, but require accurate and complex geometries which makes their fabrication challenging at higher frequencies. The compact 10 x10 x0.9 mm3 OMT-chip presented in this paper is the first micromachined full-band OMT in any frequency range, and only the second turnstile OMT implemented above 110 GHz. The measured insertion loss (0.3 dB average, 0.6 dB worst-case) and the cross-polarization (60 dB average, 30 dB worst-case) over the whole waveguide band represent the best performance of any wideband OMT, regardless of design or fabrication technology, in the 220 – 330 GHz band. The return loss with 22 dB average (16 dB worst-case) is comparable or better than previous work. The paper discusses design considerations and compromises of this complex 9 layer silicon micromachined device, including the influence of sidewall slopes, underetching, and post-bonding misalignment between the chips. It is shown that for a device which is very sensitive to geometrical variations, such as a turnstile OMT, it is necessary to anticipate and compensate for any fabrication imperfections in the design to achieve high RF performance.
关键词： terahertz,mmW,DRIE,orthomode transducer,turnstile,silicon micromachining,THz,millimeter wave,MEMS,OMT
更新于2025-09-11 14:15:04