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(biāo)簽：
Communications
Wireless
Edition
2nd
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
AT89S52-24單片機(jī)最小系統(tǒng)開(kāi)發(fā)板ALTIUM設(shè)計(jì)硬件原理圖+PCB文件,2層板設(shè)計(jì)，大小為121x149mm，Altium Designer 設(shè)計(jì)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(kāi)或修改，可作為你的產(chǎn)品設(shè)計(jì)的參考。主要器件型號(hào)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
標(biāo)簽：
at89s52
單片機(jī)
上傳時(shí)間：
2021-11-17
上傳用戶：
為解決移相全橋電路驅(qū)動(dòng)及相角控制問(wèn)題,設(shè)計(jì)了一種數(shù)字控制的移相全橋驅(qū)動(dòng)電路.以TPL521為光耦隔離、IR2110為柵極驅(qū)動(dòng)芯片.由DSP產(chǎn)生PWM信號(hào),經(jīng)過(guò)光耦隔離和邏輯電路后送至IR2110進(jìn)行相角控制.文章對(duì)IR2110驅(qū)動(dòng)電路原理進(jìn)行分析及參數(shù)進(jìn)行設(shè)計(jì),對(duì)TMS320F28335進(jìn)行設(shè)置并給出部分代碼.實(shí)驗(yàn)結(jié)果表明：通過(guò)TMS320F28335可產(chǎn)生的不同相角的PWM波形,滿足了移相全橋?qū)Σ煌嘟强刂频囊?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.
標(biāo)簽：
dsp28335
ir2110
芯片
上傳時(shí)間：
2022-05-03
上傳用戶：zhanglei193
