Search results for: Zexian Li
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Angewandte Chemie International Edition > 60 > 1 > 186 - 190
An efficient method for photocatalytic perfluoroalkylation of vinyl‐substituted all‐carbon quaternary centers involving 1,2‐aryl migration has been developed. The rearrangement reactions use fac‐Ir(ppy)3, visible light and commercially available fluoroalkyl halides and can generate valuable multisubstituted perfluoroalkylated compounds in a single step that would be challenging to prepare by other...
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Angewandte Chemie > 133 > 1 > 188 - 192
An efficient method for photocatalytic perfluoroalkylation of vinyl‐substituted all‐carbon quaternary centers involving 1,2‐aryl migration has been developed. The rearrangement reactions use fac‐Ir(ppy)3, visible light and commercially available fluoroalkyl halides and can generate valuable multisubstituted perfluoroalkylated compounds in a single step that would be challenging to prepare by other...
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Angewandte Chemie International Edition > 58 > 28 > 9448 - 9452
A series of in situ formed alkenyl diboronate complexes from alkenyl Grignard reagents (commercially available or prepared from alkenyl bromides and Mg) with B2Pin2 (bis(pinacolato)diboron) react with diverse alkyl halides by a Ru photocatalyst to give various gem‐bis(boryl)alkanes. Alkyl radicals add efficiently to the alkenyl diboronate complexes, and the adduct radical anions undergo radical‐polar...
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Angewandte Chemie > 131 > 28 > 9548 - 9552
A series of in situ formed alkenyl diboronate complexes from alkenyl Grignard reagents (commercially available or prepared from alkenyl bromides and Mg) with B2Pin2 (bis(pinacolato)diboron) react with diverse alkyl halides by a Ru photocatalyst to give various gem‐bis(boryl)alkanes. Alkyl radicals add efficiently to the alkenyl diboronate complexes, and the adduct radical anions undergo radical‐polar...
chapter
Ultra-reliable and low latency communications is envisioned to enable new services and applications with high reliability, availability and low latency, e.g, factory automation, Tactile Internet. Device-to-device communication is one such mean that allows devices to experience benefits in terms of shorter communication latency. Currently most device-to-device communication in frequency-division duplex...
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The coming 5G cellular communication system is envisioned to support a wide range of new use cases on top of regular cellular mobile broadband services. One of the 5G usage scenarios is ultra-reliable low-latency communications (URLLC). It has been predicted that URLLC will play an essential role in enabling wireless communications for emerging new services and applications such as factory automation,...
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International Journal of Wireless Information Networks > 2017 > 24 > 3 > 317-327
Ultra-reliable low-latency communications (URLLC) is a new feature to be considered for the fifth generation (5G) cellular systems. This feature is essential for the support of envisioned mission-critical applications, particularly in the realm of machine-type communications. These applications require that the messages, which are generally short-length packets, to be exchanged between a source and...
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The cellular wireless systems are gaining more attention among other connectivity solutions for supporting machine-type communications (MTC). The efficient support of MTC relies on incorporating new features in the communication networks. Ultra-reliable low-latency communications (URLLC) is one of the considered features that is essential for the support of mission-critical applications, such as industrial...
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Enabling extreme mobile broadband data rates with improved reliability is a challenging requirement in 5G radio access networks. In order to achieve this, enhancements in currently defined self-organizing functions are essential. In this work, we consider the use of reflection environment maps (RefMaps) to improve reliability, coverage and data rates in 5G ultra-dense small cell deployments. The 5G...
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The focus of this paper on mission-critical communications in a 5G cellular communication system. Technologies to provide ultra-reliable communication, with 99.999 % availability in a factory environment are studied. We have analysed the feasibility requirements for ultra-reliable communication and obtained the loss margins against path loss, shadow and fast fading. We also study the effect of increased...
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Cellular systems are gaining more attention as a means of connectivity solutions for machine-type communications (MTC). The future cellular systems need to encounter new features in order to meet the diverse requirements of MTC applications. Ultra-reliable with low-latency communications (URLLC) is one of the considered features, required for mission-critical applications. This paper attempts to provide...
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Evolving 5G cellular communication is envisioned to enable connectivity for a wide range of new use cases. The focus on mission-critical communications, such as factory automation, public safety and vehicular safety applications presses the demand for ultra-reliable communication. In this paper, we investigate by various means of multi-hop relaying schemes to improve the reliable communication in...
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Fifth generation (5G) wireless systems will provide connectivity for a wide range of new applications with diverse requirements. In part, the network needs to support ultra-reliable communications with low-latency (URLLC) for mission-critical applications. For these applications, the generated data should be delivered with a limited number of transmission attempts with high success probability. This...
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Food Analytical Methods > 2017 > 10 > 3 > 666-674
The concentration of glucose in fruit is a key index for fruit quality. Despite the fact that there are many methods to detect glucose, finding a rapid, visual, and inexpensive method to detect glucose in fruit is still a great challenge. In this study, the concept of paper-based microfluidic device (μPAD) was extended to high-performance chemo-sensors for semi-quantitative detection of glucose in...
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The fifth generation (5G) of cellular networks is expected to provide connectivity for a wide range of services. This requires the network to encounter novel features. Ultra-reliable communications (URC) is one of the considered features, which provides a certain level of communication service almost all the time. This is essential in order to support mission-critical applications, such as industrial...
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Multi-Carrier Spread-Spectrum > General Issues > 57-64
Multicarrier code-division multiple-access (MC-CDMA) is a potentially attractive multiple access technique for future wireless communication systems. A unified multirate MCCDMA system model able to fit different multirate transmission schemes is presented. The performance of the multicode system with the same processing gain and the variable spreading factor (VSF) system is compared. Based on the...
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Device-to-device (D2D) proximity services has been one of the key topics in Release 12 of 3GPP LTE and most of its technical specifications were recently concluded. Among them, synchronization procedure is a crucial step required for devices to proceed with any further operation such as discovery and communication. Once the devices are synchronized, other operations can be initiated. Technical details...
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The explosive growth of the demand for higher data rates in mobile networks have been mainly driven by the increasing use of cloud based applications by smartphones. This has led the industry to investigate new radio access technologies to be deployed as part of 5G networks, while providing mechanisms to manage user mobility and traffic in a more efficient manner. In this paper, we consider a mobility...
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In order to harvest the business potential of deviceto-device (D2D) communication, direct communication between devices subscribed to different mobile operators should be supported. This would also support meeting requirements resulting from D2D relevant scenarios, like vehicle-to-vehicle communication. In this paper, we propose to allocate the multi-operator D2D communication over dedicated cellular...
