n the first part of this book, we give an introduction to the basic applications of wireless com- munications, as well as the technical problems inherent in this communication paradigm. After a brief history of wireless, Chapter 1 describes the different types of wireless services, and works out their fundamental differences. The subsequent Section 1.3 looks at the same problem from a different angle: what data rates, ranges, etc., occur in practical systems, and especially, what combInation of performance measures are demanded (e.g., what data rates need to be transmitted over short distances; what data rates are required over long distances?) Chapter 2 then describes the technical challenges of communicating without wires, putting special emphasis on fading and co-channel interference. Chapter 3 describes the most elementary problem of designing a wireless system, namely to set up a link budget in either a noise-limited or an interference-limited system. After studying this part of the book, the reader should have an overview of different types of wireless services, and understand the technical challenges involved in each of them. The solutions to those challenges are described in the later parts of this book.
標簽： Communications Wireless Edition 2nd
上傳時間： 2020-06-01
上傳用戶：shancjb
It has been over a decade since the Chinese publication of Line Loss in Electric Power Systems. To keep pace with technological developments, I started a revision as early as 2002, following the main principles that the theoretical framework and characteristics of the first edition should be retained, with new contents added according to new problems after the reform of electric power systems and the new requirements for line loss management practices and in combInation with practical experience.
上傳時間： 2020-06-07
上傳用戶：shancjb
One of the predominant topics in the domain of the emerging Smart Grid can be seen in standardization. With the combInation of existing protection and automa- tion technology with upcoming ICT-based solutions, different interoperability is- sues arise when technologies have to be combined in the infrastructure. Standards have proven to be one of the most striking solutions to actually cope with this topic. Since 2008, this topic has gained much attention in various political and technical agendas.
標簽： Standardization Smart Grids in
上傳時間： 2020-06-07
上傳用戶：shancjb
Since its release, Arduino has become more than just a development platform; it has become a culture built around the idea of open source and open hardware, and one that is reimagining computer science and education. Arduino has opened hardware development by making the starting skills easy to obtain, but retaining the complexities of real-world application. This combInation makes Arduino a perfect environment for school students, seasoned developers, and designers. This is the first Arduino book to hold the title of “Pro,” and demonstrates skills and concepts that are used by developers in a more advanced setting. Going beyond projects, this book provides examples that demonstrate concepts that can be easily integrated into many different projects and provide inspiration for future ones. The focus of this book is as a transition from the intermediate to the professional.
上傳時間： 2020-06-09
上傳用戶：shancjb
電學中的測量技術(shù)涉及范圍非常廣,電流測量在電學計量中占有非常重要的位置。如何精確地進行電流測量是精密測量的一大難題。傳統(tǒng)的電流檢測電路多采用運算放大芯片與片外電流檢測電路相結(jié)合的方式,電路集成度很低,需要較多的接口和資源才能完成對電路的檢測。本文把所有電路部分都集成在一塊芯片上,包括檢測電阻,運算放大器電路及模擬轉(zhuǎn)數(shù)字轉(zhuǎn)換電路,從而在電路內(nèi)部可以進行電流檢測,使電路更好的集成化。前置電路使用二級共源共柵結(jié)構(gòu)的運算放大器,減小溝道長度調(diào)制效應造成的電流誤差。10位SAR ADC中采用電容驅(qū)動能力強的傳輸門保證了模數(shù)轉(zhuǎn)化器的有效精度。比較器模塊采用再生鎖存器與遲滯比較器作為基礎(chǔ)單元組合解決精密測量的問題。本設(shè)計可以作為嵌入芯片內(nèi)的一小部分而檢測芯片中的微小電流1mA~100mA,工作電壓在1.8v左右,電流檢測精度預期達到10uA的需求。The measurement technology in electricity involves a wide range,and current measurement plays a very important position in electrical measurement.How to accurately measure current is a big problem in precision measurement. The traditional current detecting circuit adopts the combInation of the operational amplifier chip and theoff-chip current detecting circuit, The circuit integration is very low, and more interfaces and resources are needed tocomplete the circuit detection.This topic integrates all the circuit parts into one chip, including detection resistance, operational amplifier circuit andanalog to digital conversion circuit. Highly integrated circuit makes the external resources on the chip more intensive,so that current detection can be carried out inside the circuit, so that the circuit can be better integrated. Thefront-end circuit of this project uses two-stage cascade operational amplifier and cascade tube to reduce the currenterror caused by channel length modulation effect. In 10-bit SAR ADC, the transmission gate with strong capacitivedriving ability ensures the effective accuracy of the analog-to-digital converter. Comparator module uses regenerativelatch and hysteresis comparator as basic unit to solve the difficult problem of precision measurement. This topic can beused as a small part of the embedded chip to detect the micro-current in the chip 1 mA~100 mA, the working voltageis about 1.8v, and the current detection accuracy is expected to reach the requirement of 10 uA.
上傳時間： 2022-04-03
上傳用戶：
實驗教學一直是工科教學中不可或缺的組成部分,對培養(yǎng)學生的動手能力,獨立思考能力,創(chuàng)新思維與發(fā)散思維具有重要的作用。針對目前電路教學實驗中電路仿真實驗與實物電路實驗各自獨立,無法統(tǒng)一問題,提出將仿真電路實驗與實物電路實驗有機的結(jié)合同步操作,并使用Web發(fā)布實現(xiàn)遠程實驗操作。采用Multisim作為電路實驗仿真平臺,NI Eiviss II作為實物電路實驗硬件平臺,運用LabVIEW整合Multisim電路仿真實驗與實物電路實驗,實現(xiàn)仿真與實物實驗有機結(jié)合,兩種實驗可同步進行。學生在仿真實驗中先可探索實驗,然后做實物實驗。同時運用LabVIEW開發(fā)出實驗過程人機交互操作接口界面,使用過程中效果良好。Experimental teaching has always been an indispensable part of engineering education.And it always plays an important role in cultivating students'practical ability,independent thinking ability,innovative thinking and divergent thinking.But simulation experiment and physical experiment cannot be unified in the circuit teaching experiment at present.In order to solve this problem,this paper proposes to combine organically the simulation circuit experiment with physical circuit experiment,and synchronously operate them.This paper uses the WEB publishing to achieve remote experimental operation.Multisim is used as the circuit simulation platform,and NI Eiviss II is used as the physical circuit hardware platform.Multisim circuit simulation experiment and physical circuit experiment are implemented by LabVIEW to realize the combInation of simulation experiment and physical experiment.Students do explore experiments in simulation experiment firstly,and then do physical experiment.And this paper uses LabVIEW to develop the experimental man-machine interface.
上傳時間： 2022-04-05
上傳用戶：
VIP專區(qū)-嵌入式/單片機編程源碼精選合集系列（65）資源包含以下內(nèi)容：1. DM9161應用電路原理圖來自DAVICOM網(wǎng)站。需要的可以自由下載.2. ALTERA CPLD器件的配置與下載,貢獻給初學習者,非長有用.3. This design package includes reference materials for creating a USB - PS/2 combInation mouse that a.4. 字符表示的十六進制數(shù)轉(zhuǎn)化為相應的整數(shù) 錯誤則返回 -1 .5. C51的12864m.6. 8個字LED點陣的顯示程序.7. 51＋ch375超級經(jīng)典的U盤讀寫程序嘿嘿趕快下載把.8. PWM控制電機C程序-已通過實驗測試 PWM控制精確控制電機的轉(zhuǎn)動..9. C51串口單工通訊程序一成功通過測試,請放心下載.10. 來自網(wǎng)上好心人的好東東,關(guān)于SD卡讀寫的,內(nèi)附protel原理圖.11. 設(shè)計輸入 ! 多種設(shè)計輸入方法 – Quartus II • 原理圖式圖形設(shè)計輸入 • 文本編輯 – AHDL, VHDL, Verilog • 內(nèi)存編輯 .12. 全是FPGA的例子 對大家應該有好處 大家趕快下把 知識不等人.13. 此為編程代碼示例.14. 此為編程代碼示例.15. 我在spartan-3e starter kit 的板上實現(xiàn)了mc8051.16. 完成MP3播放功能.17. 一個關(guān)于實時時鐘驅(qū)動方面的程序（ARM7）.18. 遍歷二叉樹的4個非遞歸算法 vc編程基礎(chǔ).19. 快速排序的非遞歸算法 vc編程練習.20. 雷達高頻接收機.21. 我的開發(fā)板的所有測試程序.22. ps2的驅(qū)動.23. 密度測試儀的源碼.24. 本程序主要內(nèi)容18b20+s52+uart單點測溫詳細c51程序.25. CPLD 9536 程序 我自己用的代碼. VHDL語言.26. AMD嵌入式處理器AU1200開發(fā)板原理圖.27. cpld3128開發(fā)板的原理圖 很有用,已經(jīng)做成PCB,需要的話可以聯(lián)系我.28. ertfs文件系統(tǒng)里面既有完整ucos程序.29. 基于atmega128的交通信號燈控制程序.30. 利用軟件編寫的I2C傳輸界面程序,適用于現(xiàn)有4位機等匯編語言中!.31. I2C控制程序,供大家學習參考,使用時根據(jù)自己的系統(tǒng)修改..32. This designs uses a Nios II system to demonstrate how to read from the SD card. The software reads W.33. his design is the initial design when the board is powered-up. It increments a counter and displays.34. 用于多于9個串口的ce驅(qū)動程序。時間倉促。可以參考.35. CSD卡的dos驅(qū)動程序源碼.36. ADT700的小程序.37. 嵌入式的小程序.38. 基于cpld的hdb3編碼器 基于cpld的hdb3編碼器.39. 基于cpld的交通燈設(shè)計 ?赾pld的交通燈設(shè)計.40. 用于ARM9系列的S3C2440A的bootloader,Linux平臺.
標簽： 固件
上傳時間： 2013-04-15
上傳用戶：eeworm
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