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- 摘要
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- 实验方案
- 产品
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[IEEE 2018 International Wafer Level Packaging Conference (IWLPC) - San Jose, CA, USA (2018.10.23-2018.10.25)] 2018 International Wafer Level Packaging Conference (IWLPC) - Advanced EWLB (Embedded Wafer Level Ball Grid Array) Solutions for Mmwave Applications
摘要： FOWLP (Fan-Out Wafer Level Packaging) has been established as one of the most versatile packaging technologies in the recent past and already accounts for a market value of over 1 billion USD due to its unique advantages. The technology combines high performance, increased functionality with a high potential for heterogeneous integration and reduces the total form factor all in a cost-effectiveness format. FOWLP volumes have largely been driven by mobile and consumer applications (RF, BB, connectivity, NFC, PMIC, audio codec, MCU etc) and are now moving to 5G communication, mmWave, automotive, MEMS/Sensor and IoT/WE applications. Advanced embedded Wafer Level Ball Grid Array (eWLB) provides a versatile platform for the semiconductor industry’s technology evolution from single or multi-die 2D package designs to 2.5D interposers and 3D System-in-Package (SiP) configurations. WLP (wafer level packaging) has already been adopted in the automotive market for cabin or infotainment applications as well as 77GHz radar sensors utilizing FO-WLP. This study focuses on the development of eWLB for mmWave applications above 60GHz with CMOS IC technology. Additionally the case study of 77GHz ADAS automotive radar is discussed. Package design optimization of single-die and multi-die, electrical performance characterization and component level reliability tests are presented.
关键词： Reliability,FOWLP,mmWave,Automotive packaging,77GHz ADAS packaging,eWLB
更新于2025-09-04 15:30:14
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Performance Analysis of Interference and Eavesdropping Immunity in Narrow Beam mmWave Networks
摘要： Exploiting highly directional antenna arrays to compensate for severe propagation loss is one of the defining features in millimeter-wave (mmWave) communications. With efficient beamforming techniques, mmWave transceivers can form steerable narrow beams. Therefore, different from convenient microwave networks, the signal or interference power in mmWave communications is highly directional and closely related to critical parameters such as interference distance and angles of departure/arrival. The high directivity implies that the co-channel interference among simultaneously active mmWave links can be expected to be significantly smaller than that for omnidirectional links and, meanwhile, the security of mmWave communications may also be enhanced. In this context, will the traditional interference mitigation and physical-layer security techniques still be efficient or necessary in mmWave networks? The answer may be negative in certain conditions. However, there is no detailed analysis on the conditions for this issue. In this paper, we jointly analyze the inter-beam interference and secrecy performance of mmWave communications for their close relation to signal-to-interference-plus-noise ratio. We also derive various performance limits (e.g., interference/eavesdropping distance limit, transmission power limit, offset angle limit, and beamwidth limit) of interference and eavesdropping immunity in mmWave networks. The theoretical and numerical results verify our analysis.
关键词： immunity,inter-beam interference,narrow beams,physical layer security,eavesdropping,Millimeter wave (mmWave)
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 5G World Forum (5GWF) - Silicon Valley, CA (2018.7.9-2018.7.11)] 2018 IEEE 5G World Forum (5GWF) - Energy-Efficient Downlink Power Control in mmWave Cell-Free and User-Centric Massive MIMO
摘要： This paper considers cell-free and user-centric approaches for coverage improvement in wireless cellular systems operating at millimeter wave frequencies, and proposes downlink power control algorithms aimed at maximizing the global energy efficiency. To tackle the non-convexity of the problems, an interaction between sequential and alternating optimization is considered. The use of hybrid analog/digital beamformers is also taken into account. The numerical results show the benefits obtained from the power control algorithm, as well as that the user-centric approach generally outperforms the cell-free one.
关键词： downlink power control,massive MIMO,user-centric,energy efficiency,mmWave,cell-free
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 23rd International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD) - Barcelona (2018.9.17-2018.9.19)] 2018 IEEE 23rd International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD) - The Fronthaul Infrastructure of 5G Mobile Networks
摘要： The next wave of innovation will certainly generate numerous new opportunities for emerging technology solutions based on networking services and applications with stringent key performance indicators (KPIs) such as ultra-low 1 ms latency, a 1000 fold bandwidth increase, 99.99% reliability and availability, which are immensely above those supported by current mobile networks. A new architecture of mobile networking called cloud radio access network (C-RAN) has been introduced over the last few years not only to supporting these indicators, but also to increasing scalability, manageability, and flexibility of mobile systems. In this context, this paper addresses the principal technology enablers and their features for C-RAN fronthaul architectures of the 5th generation (5G) mobile networks, namely space-division multiplexing (SDM), massive multiple-input multiple-output (MIMO) signaling, analog radio-over-fiber (A-RoF), and millimeter wave (mmWave) frequency technology. These technologies pave the way towards a truly viable and efficient fronthaul infrastructure for 5G mobile communications with connectivity for thousands of users and strict latency control. In this fashion, we perceive a network infrastructure scenario with seamless starting and ending interfaces by exploiting space diversity in both radio frequency and optical domains with efficient integrated photonics technology - all combined with adaptive software-defined network programming, so as to satisfy the 5G KPIs. Furthermore, we address the most relevant features of these technologies as a potential guideline for potential fronthaul infrastructure deployment of next generation mobile networks.
关键词： SDM,C-RAN,KPI,5G,MIMO,mmWave,A-RoF
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Inter-Link Interference Measurement of Indoor Dense Millimeter-Wave WLANs
摘要： An exponential increase in the number of smart mobile devices with high demands of wireless data traffic is driving Wireless Local Area Networks (WLANs) toward high-density deployments and millimeter-wave (mmWave) operations. Inter-link interference is a crucial factor in such systems, which impacts on the link performance and system capacity. However, it has not been well-investigated yet. We conducted a measurement campaign on inter-link interference in a meeting room environment with dense deployment of mmWave WLANs. Some key impact factors, such as the beamwidths and positions of transmitter and receiver as well as the number of active links in a network, were investigated. Our measurement results demonstrate that the decrease of the beamwidths of transmitter and receiver and/or the decrease of the number of active links in the network can significantly improve the signal-to-interference ratio (SIR) due to reduction of the inter-link interference. Furthermore, it is observed that the inter-link interference in a dense deployment environment mainly depends on a few dominated active links.
关键词： WLAN,experimental study,inter-link interference,dense deployment,mmWave
更新于2025-09-04 15:30:14