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5G基站

5G基站是5G网络的核心设备,提供无线覆盖,实现有线通信网络与无线终端之间的无线信号传输。基站的架构、形态直接影响5G网络如何部署。由于频率越高,信号传播过程中的衰减也越大,5G网络的基站密度将更高。
  • Full-Duplex+Small+Cells

    The recent developments in full duplex (FD) commu- nication promise doubling the capacity of cellular networks using self interference cancellation (SIC) techniques. FD small cells with device-to-device (D2D) communication links could achieve the expected capacity of the future cellular networks (5G). In this work, we consider joint scheduling and dynamic power algorithm (DPA) for a single cell FD small cell network with D2D links (D2DLs). We formulate the optimal user selection and power control as a non-linear programming (NLP) optimization problem to get the optimal user scheduling and transmission power in a given TTI. Our numerical results show that using DPA gives better overall throughput performance than full power transmission algorithm (FPA). Also, simultaneous transmissions (combination of uplink (UL), downlink (DL), and D2D occur 80% of the time thereby increasing the spectral efficiency and network capacity

    标签: Full-Duplex Cells Small

    上传时间: 2020-05-27

    上传用户:shancjb

  • Hybrid+Analog-Digital+Precoding

    In this paper we revisit hybrid analog-digital precoding systems with emphasis on their modelling and radio-frequency (RF) losses, to realistically evaluate their benefits in 5G system implementations. For this, we decompose the analog beamforming networks (ABFN) as a bank of commonly used RF components and formulate realistic model constraints based on their S-parameters. Specifically, we concentrate on fully-connected ABFN (FC-ABFN) and Butler networks for implementing the discrete Fourier transform (DFT) in the RF domain. The results presented in this paper reveal that the performance and energy efficiency of hybrid precoding systems are severely affected, once practical factors are considered in the overall design. In this context, we also show that Butler RF networks are capable of providing better performances than FC-ABFN for systems with a large number of RF chains.

    标签: Analog-Digital Precoding Hybrid

    上传时间: 2020-05-27

    上传用户:shancjb

  • Large-scale+Antenna+Systems

    To meet the future demand for huge traffic volume of wireless data service, the research on the fifth generation (5G) mobile communication systems has been undertaken in recent years. It is expected that the spectral and energy efficiencies in 5G mobile communication systems should be ten-fold higher than the ones in the fourth generation (4G) mobile communication systems. Therefore, it is important to further exploit the potential of spatial multiplexing of multiple antennas. In the last twenty years, multiple-input multiple-output (MIMO) antenna techniques have been considered as the key techniques to increase the capacity of wireless communication systems. When a large-scale antenna array (which is also called massive MIMO) is equipped in a base-station, or a large number of distributed antennas (which is also called large-scale distributed MIMO) are deployed, the spectral and energy efficiencies can be further improved by using spatial domain multiple access. This paper provides an overview of massive MIMO and large-scale distributed MIMO systems, including spectral efficiency analysis, channel state information (CSI) acquisition, wireless transmission technology, and resource allocation.

    标签: Large-scale Antenna Systems

    上传时间: 2020-05-27

    上传用户:shancjb

  • RFIC+Design+for+Cognitive+Radio+Systems

    Cognitive radios have become a vital solution that allows sharing of the scarce frequency spectrum available for wireless systems. It has been demonstrated that it can be used for future wireless systems as well as integrated into 4G/5G wireless systems. Although there is a great amount of literature in the design of cognitive radios from a system and networking point of view, there has been very limited available literature detailing the circuit implementation of such systems. Our textbook, Radio Frequency Integrated Circuit Design for Cognitive Radios, is the first book to fill a disconnect in the literature between Cognitive Radio systems and a detailed account of the circuit implementation and architectures required to implement such systems. In addition, this book describes several novel concepts that advance state-of-the-art cognitive radio systems.

    标签: Cognitive Systems Design Radio RFIC for

    上传时间: 2020-06-01

    上传用户:shancjb

  • 5G终端异常掉话优化

    说明:本号将长期上传通信技术文档、希望能够帮到您、为了促使我们继续为您提供更好的服务、请点赞哦、仅致以诚挚的感谢,祝阅读愉快

    标签: 5g

    上传时间: 2021-11-21

    上传用户:

  • FPGA自学米尔 Xilinx zynq7020开发板全套资料链接

    资料共5G,Zynq 7020平台,包括FPGA、SDK源码,例程源码,各种图像处理,人工智能算法,原理图,PCB,适合做项目移植、项目开发

    标签: fpga xilinx zynq7020 开发板

    上传时间: 2021-12-20

    上传用户:wangshoupeng199

  • 广和通物联网产品手册中文

    广和通是中国首家A股上市的物联网无线模组企业。致力于将可靠、便捷、安全、智能的无线通信解决方案普及至每一个物联网应用场景,丰富智慧生活。广和通提供创新的5G、4G、3G、2G、NB-IoT、LTE-M、智能、车规级无线通信模组及物联网应用一站式无线通信解决方案 。广和通拥有全球1000多名员工,产品及服务遍及100多个国家。

    标签: 物联网

    上传时间: 2021-12-26

    上传用户:

  • 无线传感器网络中基于模糊理论的决策级数据融合技术的分析

    摘要:无线传感器网络(Wireless Sensor Networks,wSN是由许多具有低功率无线收发装置的传感器节点组成,它们监测采集周边环境信息并传送到基站进行处理在某一时刻通过wSN采集的数据量非常大,如何正确、高效地处理这些数据成为当前WSN研究中的一个热点。传感器节点一般部署在恶劣环境中,一些偶然因素会使采集的数据中出现不准确的数据,用户依据这样的数据很难准确判断出被测对象的真实状态。基于模糊理论的决策级数据融合算法能够很好的解决这个问题本文以国家863研究项目《基于无线传感器网络的铁路危险货物在途安全状态监测技术研究》为背景,结合铁路运输中棉花在途状态监测系统的开发,在分析了当前有效的决策级数据融合技术基础上,提出了基于模糊理论的决策级数据融合算法,该算法通过对采集数据进行处理和分析,以获得准确的被测对象状态的描述。本文的主要工作包括:(1)分析了WSN中传统的决策级数据融合算法,如自适应加权数据融合算法和算术平均数数据融合算法,总结这两种算法的优缺点和检测系统的需求,进步明确理想算法应达到的目标。(2)提出了基于模糊理论的两阶段数据融合算法:该算法第一阶段利用基于贴近度的数据融合算法进行同类数据的融合校准,这一阶段的目的是剔除错误的和可信度较差的数据,得到相对更加准确的数据,第二阶段利用模糊推理对第个阶段得到的异类数据进行融合推理,得到被测对象当前状态的描述,为决策提供支持(3)结合实测数据仿真本文所提出的算法,结果证明与传统的融合算法相比,可以更加准确的描述被测对象状态

    标签: 无线传感器

    上传时间: 2022-03-17

    上传用户:

  • 智能手表制作,STM32F103VET6

    基于STM32F103VET6的智能手表,开放源代码,电路原理图,系统采用STM32F103VET6(主控芯片)+uCOS(操作系统)-III+emwin5.24(图形界面)+MPU6050(三轴加速度传感器)+BC04(蓝牙模块)+GPRS+DS18B20。湿度那个就没做啦现在简单介绍一下它的功能。功能简介:1.具有手表功能,可以查看当前日期、时间、以及环境的温度和湿度。2.可以对当前的使用者运动的情况进行检测,检测运动的步数,运动时间以及运动过程中所消耗的体内能量情况。3.可以检测当前使用者是否发生摔倒的情况,若摔倒则会以手机短信的形式发送到另一台固定的手机号码上。4.可以进行家电控制的功能,控制空调的开关,温度以及模式,控制大灯,房间,厨房灯的开关和亮度。5.可以设置当前整个手表系统的环境,设置日期、时间、计步的灵敏度、蓝牙开关、报警开关、以及屏幕的背光亮度,背光时长。废话不多说,现在先上几张作品图。1.发个外观图,这个是时间界面,首先先要说明,我在这里发淘宝链接并不是打广告,只是方便让大家做的时候更容易找到所需要的元器件。这个屏幕选用,ili9342。2.0寸,320*240的液晶屏。GPRS模块,它具有基站定位的功能。

    标签: 智能手表 STM32

    上传时间: 2022-03-19

    上传用户:qdxqdxqdxqdx

  • 基于ARM和Linux的嵌入式远程视频监控系统的设计

    本文根据大楼电梯视频监控系统的要求,提出了一种基于嵌入式技术的网络视频监控系统实现方案。系统以嵌入式 Linux和嵌入式微处理器S3C2410X为核心平台,通过嵌入式平台建立的基于TCP/TP协议的视频服务器,将USB摄像头采集来的图像数据压缩后,经过网络传输,完成对监控现场的网络视频监控任务。论文首先阐述了嵌入式网络视频监控系统的发展、现状以及整体构建,然后介绍了嵌入式 Linux操作系统以及ARM处理器的发展情况,分析了主要外围电路的设计,以及如何在ARM硬件平台上进行嵌入式 Linux内核的编译与移植,介绍了 Bootloader的启动原理及运行过程,并对在 Linux操作系统下的USB驱动程序的开发进行了研究。本文重点讨论了图像采集、编码和网络通信程序的设计原理与实现。最后进行了系统整体测试,并提出进一步开发设想。本文的研究结果具有较大的工程实际意义,对于基于P技术的各种视频通信应用具有一定的参考价值。关键词:ARM,s3C2410X,嵌入式,Linux,视频监控当今社会是一个信息高速发展的时代,获取信息的方便和快捷可以使我们在信息化的今天领先一步创造出巨大的利益,而我们获取信息的一个重要的途径就是通过眼睛在人类感官接受的各种信息中约有80%来自视觉2图像是对客观事物形象、生动的描述,是直观而具体的信息表达形式,是人类最重要的信息载体。随着科学技术的快速发展和人民物质生活水平的提高,视频监控系统以其直观、方便和信息内容丰富等特点日益受到人们的青睐,并在各行各业得到了广泛的应用。生活中有小区安全监控,电讯行业有基站监控,银行系统有柜员机监控,林业部门有火情监控,交通方面有违章和流量监控等等

    标签: arm linux 嵌入式 远程视频监控系统

    上传时间: 2022-03-30

    上传用户: