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书籍 GSM, GPRS and EDGE Performance Evolution
The wireless market has experienced a phenomenal growth since the first second-
generation (2G) digital cellular networks, based on global system for mobile
communications (GSM) technology, were introduced in the early 1990s. Since then,
GSM has become the dominant global 2G radio access standard. A ...
书籍 Mobile+and+Wireless+Systems+Beyond+3G
With the rapid growth of the wireless mobile applications, wireless voice has
begun to challenge wireline voice, whereas the desire to access e-mail, surf the
Web or download music (e.g., MP3) wirelessly is increasing for wireless data.
While second generation (2G) cellular wireless systems, such as ...
书籍 RF Measurements for Cellular Phones
The market for cellular phones and wireless data transmission equipment has changed
dramatically since the late 1970s when cellular phones were first introduced and the
late 1980s when wireless data equipment became available. As would be expected,
duringthistime RF test requirements and RF test equ ...
书籍 The 3G IP Multimedia Subsystem (IMS)
When 3GPP started standardizing the IMS a few years ago, most analysts expected the
number of IMS deploymentsto grow dramatically as soon the initial IMS specifications were
ready (3GPP Release 5 was functionallyfrozenin the first half of 2002and completedshortly
after that). While those predictions ...
书籍 Wireless+Networking+Complete
This chapter provides extensive coverage of existing mobile wireless technologies. Much of the
emphasis is on the highly anticipated 3G cellular networks and widely deployed wireless local
area networks (LANs), as the next-generation smart phones are likely to offer at least these two
types of conne ...
书籍 RFID_Security_and_Privacy_Concepts
In the first chapter, the topic of this book is classified into the area of pervasive com-
puting. Further, security and privacy in the scope of RFID technology is motivated
and the vision that guides the remainder of this book is introduced.
技术资料 基于stm32f103c8t6单片机的主从式桌面机械臂的设计
随着科技发展及工业4.0 进程推进,机械臂应用范围越来越广,并演化出各种各样的机械臂,如码垛机械臂、焊接机械臂、装配机械臂以及手术机械臂等。现利用solidworks 进行三维建模,设计制作一款基于stm32f103c8t6 单片机的主从式桌面级机械臂,该机械臂包括一个主动机械臂和一个从动机械臂,采用蓝牙传输信号方式进行同步运动,并且 ...
技术资料 基于单片机和人体红外线传感器自动关门锁门的装置
入室抢劫事件屡见不鲜,针对此现象进行分析不难发现,造成失窃事件的极大原因是人们慵懒和意识差等不良性格造成习惯性不锁门.本文以STC89C52单片机为基础,设计了一种基于人体红外传感器的自动关门锁门装置,来解决此类问题.The incidents of burglary are so common. It is not difficult to find that the main reason for th ...
技术资料 磁致伸缩位移传感器的设计与实现
本文设计了一种磁致伸缩位移传感器,介绍了该磁致伸缩位移传感器的测量原理,通过结构优化设计提高了仪器的性能,详述了硬件电路设计及实现方法,完成了软件设计,实现了高压充电、问询脉冲加载、时间测量及滤波等功能,并通过实验对其性能进行了验证。所研制的磁致伸缩位移传感器具有测量精度高、长期稳定性好等特点,满足了大量 ...
技术资料 高精度双向DC电源电流采样电路设计
为适应双向DC/DC功率变换的电流采样需求,一种高精度高边电流采样电路被提出。其基本思想是在功率电路的高边串入采样电阻,借助电流镜原理并引入偏置电流电路,将双向电流均转换为正向电压输出。通过理论分析与仿真结合的方法对电流镜采样原理及4种不同的偏置电流电路方案进行对比,最后通过实验数据验证了高精度高边电流采样电 ...