5G Cellular User Equipment: From Theory to Practical Hardware Design

Research and development on the next generation wireless systems, namely 5G, has experienced explosive growth in recent years. In the physical layer (PHY), the massive multiple-input-multiple-output (MIMO) technique and the use of high GHz frequency bands are two promising trends for adoption. Millimeter-wave (mmWave) bands such as 28 GHz, 38 GHz, 64 GHz, and 71 GHz, which were previously considered not suitable for commercial cellular networks, will play an important role in 5G. Currently, most 5G research deals with the algorithms and implementations of modulation and coding schemes, new spatial signal processing technologies, new spectrum opportunities, channel modeling, 5G proof of concept (PoC) systems, and other system-level enabling technologies. In this paper, we first investigate the contemporary wireless user equipment (UE) hardware design, and unveil the critical 5G UE hardware design constraints on circuits and systems. On top of the said investigation and design trade-off analysis, a new, highly reconfigurable system architecture for 5G cellular user equipment, namely distributed phased arrays based MIMO (DPA-MIMO) is proposed. Finally, the link budget calculation and data throughput numerical results are presented for the evaluation of the proposed architecture.Comment: Submitted to IEEE ACCESS. It has 18 pages, 17 figures, and 5 table

Investor Skepticism v. Investor Confidence: Why the New Research Analyst Reforms Will Harm Investors

Part I of this Article provides an overview of research analysts and their basic functions, including a discussion of sell-side analysts\u27 role in the market\u27s recent boom and bust. Part II examines the conflicts of interest that have plagued sell-side research, and Part III reviews the Regulatory Actions that are meant to address these conflicts. In Part IV, the author will make the case for encouraging, rather than lessening, investor skepticism in sell-side research and will explain why the Regulatory Actions are not likely to improve the performance of sell-side analysts. Finally, Part V will offer a simpler proposal to address the sell-side analyst issue. While there may not be a solution to the maybe not problem, the information gap between institutional investors and retail investors regarding the weaknesses of sell-side research can be eliminated, which would allow retail investors to benefit from the value of sell-side research while also granting them the opportunity to properly protect themselves from its weaknesses. Akin to the Surgeon General\u27s warning for cigarette manufacturers, this Article proposes that sell-side analysts and their firms be required to prominently include, with all research, a short and clear warning from the United States Securities and Exchange Commission ( SEC ), regarding the historical weaknesses of sell-side research

Military Values in Law

Congress, for example, takes inappropriate advantage of the tremendous deference given by courts to its constitutional powers to raise and support Armies, to provide and maintain a Navy, and to make Rules for the Government and Regulation of the land and naval Forces.\n In a court-martial involving a military defendant and a civilian victim of sexual assault, application of the psychotherapist-patient privilege raises no difficult issues related to professional military values. When both the victim and the defendant are members of the military, however, the victim\u27s assertion of privilege is at least potentially inconsistent with the victim\u27s professional obligation to place the military\u27s institutional need to discipline misconduct undermining military readiness above an individual desire not to reveal communications concerning the criminal act

The Failure of Local and Federal Prosecutors to Curb Police Brutality

Although police departments across the country have attempted to ameliorate the hostility between police officers and the cumminity, through careful screening of applicants, minority recruitment, and community policing, police brutality remains a problem within our urban cities. This Essay will first argue that police brutality is largely ignored. Second, it will examine the obstacles facing local and federal prosecutors in obtaining convictions. Then it will compare the advantages and disadvantages of delegating primary responsibility for these cases to the state versus the federal level. Finally, it will argue that, although there are obstacles and advantages for both local and federal prosecutors, ultimately justice is best seved when police brutality is primarily pursued by local prosecutors

NASA patent abstracts bibliography: A continuing bibliography. Section 1: Abstracts (supplement 39)

Abstracts are provided for 154 patents and patent applications entered into the NASA scientific and technical information systems during the period Jan. 1991 through Jun. 1991. Each entry consists of a citation, an abstract, and in most cases, a key illustration selected from the patent or patent application

Physical and biological controls on fine sediment transport and storage in rivers

Excess fine sediment, comprising particles <2 mm in diameter, is a major cause of ecological degradation in rivers. The erosion of fine sediment from terrestrial or aquatic sources, its delivery to the river, and its storage and transport in the fluvial environment are controlled by a complex interplay of physical, biological and anthropogenic factors. Whilst the physical controls exerted on fine sediment dynamics are relatively well-documented, the role of biological processes and their interactions with hydraulic and physico-chemical phenomena has been largely overlooked. The activities of biota, from primary producers to predators, exert strong controls on fine sediment deposition, infiltration and resuspension. For example, extracellular polymeric substances (EPS) associated with biofilms increase deposition and decrease resuspension. In lower energy rivers, aquatic macrophyte growth and senescence are intimately linked to sediment retention and loss, whereas riparian trees are dominant ecosystem engineers in high energy systems. Fish and invertebrates also have profound effects on fine sediment dynamics through activities that drive both particle deposition and erosion depending on species composition and abiotic conditions. The functional traits of species present will determine not only these biotic effects but also the responses of river ecosystems to excess fine sediment. We discuss which traits are involved and put them into context with spatial processes that occur throughout the river network. Whilst strides towards better understanding of the impacts of excess fine sediment have been made, further progress to identify the most effective management approaches is urgently required through close communication between authorities and scientists

Special Libraries, May-June 1971

Volume 62, Issue 5-6https://scholarworks.sjsu.edu/sla_sl_1971/1004/thumbnail.jp