Wireless communication has become increasingly important not only for professional appli- cations but also for many fields in our daily routine and in consumer electronics. In 1990, a mobile telephone was still quite expensive, whereas today most teenagers have one, and they use it not only for calls but also for data transmission. More and more computers use wireless local area networks (WLANs), and audio and television broadcasting has become digital.
標簽： Applications and Theory OFDM CDMA of
上傳時間： 2020-06-01
上傳用戶：shancjb
The information age is exploding around us, giving us access to dizzying amounts of data the instant it becomes available. Smart phones and tablets provide an untethered experience that offers stream- ing video, audio, and other media formats to just about any place on the planet. Even people who are not “computer literate” use Facebook to catch up with friends and family, use Google to research a new restaurant choice and print directions to get there, or Tweet their reactions once they have sampled the fare. The budding Internet-of-things will only catalyze this data eruption. The infrastructure supporting these services is also growing exponentially, and the technology that facilitates this rapid growth is virtualization.
上傳時間： 2020-06-01
上傳用戶：shancjb
Mobile radio communications are evolving from pure telephony systems to multimedia platforms offering a variety of services ranging from simple file transfers and audio and video streaming, to interactive applications and positioning tasks. Naturally, these services have different constraints concerning data rate, delay, and reliability (quality-of-service (QoS)). Hence, future mobile radio systems have to provide a large flexibility and scal- ability to match these heterogeneous requirements.
標簽： Communications Wireless Channels MIMO over
上傳時間： 2020-06-01
上傳用戶：shancjb
This book is the result of works dedicated to specific applications of metaheuristics in smart electrical grids. From electric transmission, distribution networks to electric microgrids, the notion of intelligence refers to the ability to propose acceptable solutions in an increasingly more restrictive environment. Most often, it refers to decision-making assisting tools designed to support all human action.
標簽： Metaheuristics Intelligent Electrical Networks for
上傳時間： 2020-06-07
上傳用戶：shancjb
The continuous progress in modern power device technology is increasingly supported by power-specific modeling methodologies and dedicated simulation tools. These enable the detailed analysis of operational principles on the the device and on the system level; in particular, they allow the designer to perform trade- off studies by investigating the operation of competing design variants in a very early stage of the development process. Furthermore, using predictive computer simulation makes it possible to analyze the device and system behavior not only under regularoperatingconditions, but also at the rim of the safe-operatingarea and beyond of it, where destructive processes occur that limit the lifetime of a power system.
標簽： POWERHVMOS_Devices_Compact_Modeli ng
上傳時間： 2020-06-07
上傳用戶：shancjb
To a quantum mechanic the whole universe is one godawful big interacting wavefunction ? but to the rest of us, it’s a world full of separate and distinguishable objects that hurt us when we kick them. At a few months of age, human children recognize objects, expect them to be permanent and move continuously, and display surprise when they aren’t or don’t. We associate visual, tactile, and in some cases audible and olfactory sensations with identifiable physical things. We’re hardwired to understand our environment as being composed of separable things with specific properties and locations. We understand the world in terms of what was where when.
上傳時間： 2020-06-08
上傳用戶：shancjb
Sound is simply an airborne version of vibration. The air which carries sound is a mixture of gases. In gases, the molecules contain so much energy that they break free from their neighbors and rush around at high speed. As Figure 1.1(a) shows, the innumerable elastic collisions of these high-speed molecules produce pressure on the walls of any gas container. If left undisturbed in a container at a constant temperature, eventually the pressure throughout would be constant and uniform.
標簽： Engineering Audio
上傳時間： 2020-06-09
上傳用戶：shancjb
2.7V to 5.5V input voltage Range? Efficiency up to 96% ? 24V Boost converter with 12A switch current Limit? 600KHz fixed Switching Frequency? Integrated soft-start? Thermal Shutdown? Under voltage Lockout? Support external LDO auxiliary power supply? 8-Pin SOP-PP PackageAPPLICATIONSPortable Audio Amplifier Power SupplyPower BankQC 2.0/Type CWireless ChargerPOS Printer Power SupplySmall Motor Power Supply
標簽： XR2981
上傳時間： 2021-11-05
上傳用戶：
This document provides general hardware and layoutconsiderations and guidelines for hardware engineersimplementing a DDR3 memory subsystem.The rules and recommendations in this document serve as aninitial baseline for board designers to begin their specificimplementations, such as fly-by memory topology.
標簽： ddr3
上傳時間： 2021-11-21
上傳用戶：
STM32L475開發板PDF原理圖+AD集成3D封裝庫+主要器件技術手冊，集成封裝庫型號列表如下：Library Component Count : 44Name Description----------------------------------------------------------------------------------------------------ANT-2.4G ANT,2.4G,PCB天線ATK-TEST-1*4-2.54mm 測試點ATK_MODULE 單排母,1*6,2.54mmBEEP 3.3V有源蜂鳴器BUTTON_DIP3 撥動開關SS-12F44C-0402-SMD C-0603-SMD C-CAP-SMD-220uF/10V C-CEP-220uF/16V D-1N4148 Header-1*3-2.54mm 單排針-2.54mmHeader-2*10-2.54mm 雙排針-2.54mmHeader-2*2-2.54mm 雙排針-2.54mmHeader-2*3-2.54mm 雙排針-2.54mmHeader-2*4-2.54mm 雙排座-2.54mmIR-LED 1206紅外發射管（側）IR-LF0038GKLL-1 紅外接收管SMDJ-MICRO-USB-5S Micro USB 5.9有柱腳長1.25加長針L-0420-4.7uH 電感,4.7uH,3ALCD-TFT-H13TS38A LCD,TFT,1.3'240*240,禹龍LED-0603-RED 發光二極管-紅色LED-RGB-1615-0603 RGB,共陽,1615,0603MIC-6022 MICMotor-SMD 電機,SMDPhone-3-M 耳機座,三節R-0402-SMD 貼片電阻R-0805-SMD 貼片電阻RT9193-3.3S-KEY-SMD-324225 KEY,SMD,324225S8050-SMD SD-MICRO-TF SD,MICRO,TFU-AHT10 Sensor,溫濕度傳感器U-AP3216C Sensor.光照/距離U-AP6181 WIFI Module,SDIOU-ES8388 AUDIO,2-ch DAC,2-ch ADCU-ICM-20608 三軸陀螺儀/三軸加速度計,U-L9110S 電機驅動,800mAU-RT9013-3.3 LDO,500mAU-STM32F103C8T6 U-STM32L475VET6 MCU,LQFP100,512K FLASH,128K RAMU-W25Q128 SPI FLASH,16MY-12M-SMD 晶振 - 12M貼片Y-3215-32.768K XTAL,3215,32.768KY-3215-8M XTAL,3215,8MHz
上傳時間： 2021-12-15
上傳用戶：
