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
基于NE555設計的聲音傳感器模塊ALTIUM硬件原理圖+PCB文件，2層板設計，大小為29x30mm，Altium Designer 設計的工程文件，包括原理圖及PCB文件，可以用Altium(AD)軟件打開或修改，可作為你的產品設計的參考。主要器件型號列表如下：Library Component Count : 8Name Description----------------------------------------------------------------------------------------------------2N3904 NPN General Purpose AmplifierCap CapacitorComponent_1_1 Header 3H Header, 3-Pin, Right AngleLED3 Typical BLUE SiC LEDMKF 麥克風Res 電阻Res2 Resistor
上傳時間： 2021-11-17
上傳用戶：
AT89S52-24單片機最小系統開發板ALTIUM設計硬件原理圖+PCB文件,2層板設計，大小為121x149mm，Altium Designer 設計的工程文件，包括完整的原理圖及PCB文件，可以用Altium(AD)軟件打開或修改，可作為你的產品設計的參考。主要器件型號列表如下：Library Component Count : 14Name Description----------------------------------------------------------------------------------------------------AT89S52-P 8 位微處理器/40引腳CAP CapacitorCAPACITOR POL CapacitorCRYSTAL CrystalD Connector 9 Receptacle Assembly, 9 Position, Right AngleHeader 2 Header, 2-PinHeader 4 Header, 4-PinHeader 5X2 Header, 5-Pin, Dual rowLED MAX232PZ_9 排針——9RES2SW-DPST Double-Pole, Single-Throw SwitchSW-PB Switch
上傳時間： 2021-11-17
上傳用戶：
AT89S52單片機主8入8出繼電器工控主板ALTIUM設計硬件原理圖+PCB文件,2層板設計，大小為121x149mm，Altium Designer 設計的工程文件，包括完整的原理圖及PCB文件，可以用Altium(AD)軟件打開或修改，可作為你的產品設計的參考。主要器件型號列表如下：Library Component Count : 25Name Description----------------------------------------------------------------------------------------------------24LC02AJKG 按鍵開關AT89S52-P 8 位微處理器/40引腳CAP CapacitorCAPACITOR POL CapacitorCPDR 瓷片電容CRYSTAL CrystalD Connector 9 Receptacle Assembly, 9 Position, Right AngleDG 電感DJDR 電解電容GO 光耦Header 5X2 Header, 5-Pin, Dual rowJDQYCK 繼電器——1常開1常閉LED 發光二極管LM2576HVT-3.3 Simple Switcher 3A Step Down Voltage RegulatorMAX232 NPN NPN Bipolar TransistorPZ_2 排針——2PZ_3 排針——3RES2Res 電阻Res PZ_8 8位排阻SW-DPST Double-Pole, Single-Throw SwitchWY2JG 穩壓二級管ZL2JG 整流二極管
上傳時間： 2021-11-17
上傳用戶：kingwide
InGaAs/AlGaAs semiconductor lasers come in threetypes: VCSELs and two types of EELs. The VCSEL, asits name implies, emits vertically, normal to the planeof the device, owing to cavity mirrors grown withinthe epitaxial material itself. The VCSEL’s circular beamhas a numerical aperture (NA) of roughly 0.2, or a fullangle of approximately 25 degrees.
標簽： tof
上傳時間： 2022-02-12
上傳用戶：
為解決移相全橋電路驅動及相角控制問題,設計了一種數字控制的移相全橋驅動電路.以TPL521為光耦隔離、IR2110為柵極驅動芯片.由DSP產生PWM信號,經過光耦隔離和邏輯電路后送至IR2110進行相角控制.文章對IR2110驅動電路原理進行分析及參數進行設計,對TMS320F28335進行設置并給出部分代碼.實驗結果表明：通過TMS320F28335可產生的不同相角的PWM波形,滿足了移相全橋對不同相角控制的要求.In order to solve the problem of phase-shifted full-bridge circuit driving and phase angle control,a digitally controlled phaseshifted full-bridge driving circuit was designed. TPL521 optocoupler isolation,IR2110 gate driver chip. PWM signals are generated by the DSP and sent to the IR2110 for phase angle control after optocoupler isolation and logic circuits. This text carries on the analysis to the principle of IR2110 drive circuit and parameter design,set up and give out some code to TMS320F28335. The experimental results show that the PWM waveforms with different phase angles generated by TMS320F28335 can meet the requirements of phase-shifted full-bridge control for different phase angles.
上傳時間： 2022-05-03
上傳用戶：zhanglei193
