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Hybrid Beamforming Design for Full-Duplex Millimeter Wave Communication
摘要： Harnessing the abundant availability of spectral resources at millimeter wave (mmWave) frequencies is an attractive solution to meet the escalating data rate demands. Additionally, it has been shown that full-duplex (FD) communication has the potential of doubling the bandwidth efficiency. However, the presence of significant residual self-interference (SI), which is especially more pronounced at mmWave frequencies because of the non-linearities in the hardware components, erodes the full potential of FD in practice. Conventionally, the residual SI is canceled in the baseband using digital processing with the aid of a transmit precoder. In this work, we propose a hybrid beamforming design for FD mmWave communications, where the SI is canceled by the joint design of beamformer weights at the radio-frequency (RF) and the precoder as well as combiner in the baseband. Our proposed design preserves the dimensions of the transmit signal, while suppressing the SI. We demonstrate that our joint design is capable of reducing the SI by upto 30 dB, hence performing similarly to the interference-free FD system while being computationally efficient. Our simulation results show that the proposed design significantly outperforms eigen-beamforming.
关键词： Beamforming,Millimeter Wave,Hybrid Precoding,MIMO,Full-Duplex
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - Atlanta, GA, USA (2018.10.31-2018.11.2)] 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - A New Series Hybrid DC-DC Converter for Wide Input Range with SiC
摘要： A new series hybrid DC-DC converter targeting for communication power supply with wide input range is designed in this paper implemented with Silicon Carbide (SiC) power transistor. The proposed hybrid converter is a combination of forward and flyback converter with full usage of transformer energy and optimized efficiency. Forward converter is the main energy delivery part and resonant network is utilized for full energy transferring and soft switching. Forward converter resets the magnetizing energy and delivers it to the output. The forward and flyback part are connected in such a novel way where flyback output is in series with the primary side. A highly compact architecture is realized with single core, multi-winding shared power transformer. Due to low gate charge and parasitic capacitance, SiC devices are premium power transistors for high frequency and high power applications. With a proper transformer design, an efficient series hybrid SiC converter is demonstrated for 100V-to-400V input at 480W output power.
关键词： Resonant secondary,Series hybrid,SiC,Wide input range,ZCS,cascaded flyback
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM) - Nagoya, Japan (2018.8.29-2018.8.31)] 2018 IEEE International Workshop on Electromagnetics:Applications and Student Innovation Competition (iWEM) - A Hybrid MoM/FDTD Method for Exposure Assessment of Wireless Power Transfer Systems
摘要： A hybrid method combining method of moments (MoM) and finite-difference time-domain (FDTD) method is proposed to evaluate exposure in a human body close to wireless power transfer (WPT) systems. Validation of the proposed method has been demonstrated by analysis of a WPT system close to a dielectric cube. Finally, the proposed method was used to determine specific absorption rate inside a human body in the vicinity of a spiral-type WPT system.
关键词： hybrid method,method of moments,exposure assessment,FDTD,wireless power transfer
更新于2025-09-04 15:30:14
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Atomistic Insight into Ion Transport and Conductivity in Ga/Al-Substituted Li <sub/>7</sub> La <sub/>3</sub> Zr <sub/>2</sub> O <sub/>12</sub> Solid Electrolytes
摘要： Garnet-structured Li7La3Zr2O12 is a promising solid electrolyte for next-generation solid-state Li batteries. However, sufficiently fast Li-ion mobility required for battery applications only emerges at high temperatures, upon a phase transition to cubic structure. A well-known strategy to stabilize the cubic phase at room temperature relies on aliovalent substitution; in particular, the substitution of Li+ by Al3+ and Ga3+ ions. Yet, despite having the same formal charge, Ga3+ substitution yields higher conductivities (10?3 S/cm) than Al3+ (10?4 S/cm). The reason of such difference in ionic conductivity remains a mystery. Here we use molecular dynamic simulations and advanced sampling techniques to precisely unveil the atomistic origin of this phenomenon. Our results show that Li+ vacancies generated by Al3+ and Ga3+ substitution remain adjacent to Ga3+ and Al3+ ions, without contributing to the promotion of Li+ mobility. However, while Ga3+ ions tend to allow limited Li+ diffusion within their immediate surroundings, the less repulsive interactions associated with Al3+ ions lead to a complete blockage of neighboring Li+ diffusion paths. This effect is magnified at lower temperatures, and explains the higher conductivities observed for Ga-substituted systems. Overall this study provides a valuable insight into the fundamental ion transport mechanism in the bulk of Ga/Al-substituted Li7La3Zr2O12 and paves the way for rationalizing aliovalent substitution design strategies for enhancing ionic transport in these materials.
关键词： Li-ion conductivity/diffusion,enhanced sampling hybrid Monte Carlo,Molecular Dynamics,GSHMC,Ga/Al-substituted LLZO,Solid electrolytes
更新于2025-09-04 15:30:14