This work titled A Digital Phase Locked Loop based Signal and Symbol Recovery System for Wireless Channel is intended to serve as a document covering funda- mental concepts and application details related to the design of digital phase locked loop (DPLL) and its importance in wireless communication. It documents some of the work done during the last few years covering rudimentary design issues, complex implementations, and fixing configuration for a range of wireless propa- gation conditions.
標(biāo)簽: Digital Locked Phase Loop
上傳時(shí)間: 2020-05-27
上傳用戶:shancjb
This book is intended for the graduate or advanced undergraduate engineer. The primary motivation for developing the text was to present a complete tutorial of phase-locked loops with a consistent notation. I believe this is critical for the practicing engineer who uses the text as a self-study guide.
標(biāo)簽: Communications phase-locked Wireless Loops for
上傳時(shí)間: 2020-05-31
上傳用戶:shancjb
This reference design describes the design of a 3-phase AC induction vector control drive with position encoder coupled to the motor shaft. It is based on Motorola’s DSP56F805 dedicated motor control device. AC induction motors, which contain a cage, are very popular in variable speed drives. They are simple, rugged, inexpensive and available at all power ratings. Progress in the field of power electronics and microelectronics enables the application of induction motors for high-performance drives, where traditionally only DC motors were applied. Thanks to sophisticated control methods, AC induction drives offer the same control capabilities as high performance four-quadrant DC drives.
標(biāo)簽: Reference Designer Manual Phase DRM 023 AC
上傳時(shí)間: 2020-06-10
上傳用戶:shancjb
偏移正交相移鍵控(OQPSK:Offset Quadrature Phase Shift Keying)調(diào)制技術(shù)是一種恒包絡(luò)調(diào)制技術(shù),具有頻譜利用率高、頻譜特性好等特點(diǎn),廣泛應(yīng)用于衛(wèi)星通信和移動(dòng)通信領(lǐng)域。 論文以某型偵收設(shè)備中OQPSK解調(diào)器的全數(shù)字化為研究背景,設(shè)計(jì)并實(shí)現(xiàn)了基于FPGA的全數(shù)字OQPSK調(diào)制解調(diào)器,其中調(diào)制器主要用于仿真未知信號,作為測試信號源。論文研究了全數(shù)字OQPSK調(diào)制解調(diào)的基本算法,包括成形濾波器、NCO模型、載波恢復(fù)、定時(shí)恢復(fù)等;完成了整個(gè)調(diào)制解調(diào)算法的MATLAB仿真。在此基礎(chǔ)上,采用VHDL硬件描述語言在Xilinx公司ISE7.1開發(fā)環(huán)境下設(shè)計(jì)并實(shí)現(xiàn)了各個(gè)算法模塊,并在硬件平臺上加以實(shí)現(xiàn)。通過實(shí)際現(xiàn)場測試,實(shí)現(xiàn)了對所偵收信號的正確解調(diào)。論文還實(shí)現(xiàn)了解調(diào)器的百兆以太網(wǎng)接口,使得系統(tǒng)可以方便地將解調(diào)數(shù)據(jù)發(fā)送給計(jì)算機(jī)進(jìn)行后續(xù)處理。
上傳時(shí)間: 2013-06-30
上傳用戶:Miyuki
Phase–locked loop (PLL) frequency synthesizers are commonlyfound in communication gear today. Th
上傳時(shí)間: 2013-04-24
上傳用戶:yxgi5
針對傳統(tǒng)儀表具有的硬件資源不足、速度慢等功能缺陷,提出了一種基于單片機(jī)的CPU設(shè)計(jì)方案,即擴(kuò)展CPU,直接從主CPU對應(yīng)的數(shù)據(jù)顯示LO口上獲取數(shù)據(jù),這種獲取數(shù)據(jù)的雙CPU設(shè)計(jì)方案中主從CPU之間在功能
標(biāo)簽: CPU 單片機(jī) 設(shè)計(jì)方案
上傳時(shí)間: 2013-08-01
上傳用戶:李彥東
偏移正交相移鍵控(OQPSK:Offset Quadrature Phase Shift Keying)調(diào)制技術(shù)是一種恒包絡(luò)調(diào)制技術(shù),具有頻譜利用率高、頻譜特性好等特點(diǎn),廣泛應(yīng)用于衛(wèi)星通信和移動(dòng)通信領(lǐng)域。 論文以某型偵收設(shè)備中OQPSK解調(diào)器的全數(shù)字化為研究背景,設(shè)計(jì)并實(shí)現(xiàn)了基于FPGA的全數(shù)字OQPSK調(diào)制解調(diào)器,其中調(diào)制器主要用于仿真未知信號,作為測試信號源。論文研究了全數(shù)字OQPSK調(diào)制解調(diào)的基本算法,包括成形濾波器、NCO模型、載波恢復(fù)、定時(shí)恢復(fù)等;完成了整個(gè)調(diào)制解調(diào)算法的MATLAB仿真。在此基礎(chǔ)上,采用VHDL硬件描述語言在Xilinx公司ISE7.1開發(fā)環(huán)境下設(shè)計(jì)并實(shí)現(xiàn)了各個(gè)算法模塊,并在硬件平臺上加以實(shí)現(xiàn)。通過實(shí)際現(xiàn)場測試,實(shí)現(xiàn)了對所偵收信號的正確解調(diào)。論文還實(shí)現(xiàn)了解調(diào)器的百兆以太網(wǎng)接口,使得系統(tǒng)可以方便地將解調(diào)數(shù)據(jù)發(fā)送給計(jì)算機(jī)進(jìn)行后續(xù)處理。
標(biāo)簽: OQPSK FPGA 調(diào)制解調(diào)器
上傳時(shí)間: 2013-05-19
上傳用戶:zl123!@#
光纖水聽器自問世以來,在巨大的軍事價(jià)值和民用價(jià)值推動(dòng)下得到了迅速發(fā)展,已逐漸從實(shí)驗(yàn)室研究階段走向工程應(yīng)用。同時(shí)隨著光纖水聽器的不斷發(fā)展,對水聲信號的檢測技術(shù)以及數(shù)字處理能力也提出了新的要求。論文在此背景下開展了一系列研究工作,并提出了利用FPGA(Field ProgrammableGate Array,現(xiàn)場可編程門陣列)實(shí)現(xiàn)光纖3×3耦合器解調(diào)算法的新思路。 目前干涉型光纖水聽器的解調(diào)一般采用PGC(Phase Generated Carrier,相位生成載波技術(shù))技術(shù)和基于3×3光纖耦合器干涉的解調(diào)技術(shù)。PGC技術(shù)在解調(diào)過程中引入了載波信號,它對采樣率,激光器等的要求都較高,因此我們把目光投向3×3耦合器解調(diào)技術(shù),文中對其解調(diào)原理進(jìn)行了闡述,對采樣率的確定進(jìn)行了討論,并對3×3耦合器三路輸出不對稱的情況進(jìn)行了分析,最后在本文的結(jié)論部分提出了基于3×3耦合器解調(diào)的改良方案。 目前,光纖信號數(shù)字化解調(diào)的硬件實(shí)現(xiàn)采用DSP(Digital Signal Process,可編程數(shù)字信號處理器)信號處理機(jī),與之相比,F(xiàn)PGA解調(diào)具有速度快、資源占用少、易于擴(kuò)展等優(yōu)勢。本文對FPGA與DSP、ASIC(application-specificintegrated circuit,專用集成電路)實(shí)現(xiàn)方案進(jìn)行了對比,分析了適合利用FPGA實(shí)現(xiàn)的算法所應(yīng)具備的特征;介紹了3×3耦合器解調(diào)算法中各個(gè)模塊的設(shè)計(jì)情況;分析了系統(tǒng)的工作情況,硬件的構(gòu)造及芯片的選擇,最后驗(yàn)證了利用FPGA可以實(shí)現(xiàn)3×3耦合器解調(diào)算法。
標(biāo)簽: 干涉型 光纖水聽器 信號解調(diào) 方法研究
上傳時(shí)間: 2013-07-03
上傳用戶:love1314
8051系列是至今為止最成功的單片機(jī)之一,在FPGA平臺上研究帶硬件浮點(diǎn)運(yùn)算器的8051是對其在SoC及專用化的方向上的一次邁進(jìn)。文章首先介紹了8051的基本架構(gòu),包括硬件模塊、指令系統(tǒng)、內(nèi)存分配以及基本外設(shè)。然后講解了在設(shè)計(jì)8051時(shí)如何劃分模塊,每個(gè)模塊的功能與設(shè)計(jì),同時(shí)也介紹了如何設(shè)計(jì)流水線來加速8051的處理速度。對于浮點(diǎn)運(yùn)算器,文章介紹了IEEE浮點(diǎn)數(shù)的表示方法,包括各種特殊值的表示方法以及作用。在探討浮點(diǎn)運(yùn)算器設(shè)計(jì)的時(shí)候首先是給出了模塊的劃分及其實(shí)現(xiàn)的功能,然后以生動(dòng)的實(shí)例介紹了加減乘除四種浮點(diǎn)運(yùn)算的算法。在介紹完8051與浮點(diǎn)運(yùn)算器設(shè)計(jì)以后,文章介紹了如何將浮點(diǎn)運(yùn)算器集成到8051上,包括硬件上的數(shù)據(jù)線接口和控制線接口,以及軟件中如何運(yùn)用硬件浮點(diǎn)運(yùn)算器。最后文章給出了此設(shè)計(jì)在ModelSim上的仿真結(jié)果以及在CyclonelIFPGA芯片上的驗(yàn)證過程,可以清楚地看到,與KeilC51軟件庫的浮點(diǎn)運(yùn)算相比,加法運(yùn)算從186個(gè)時(shí)鐘周期減少到4個(gè)時(shí)鐘周期,減法運(yùn)算從200個(gè)時(shí)鐘周期減少到4個(gè)時(shí)鐘周期,乘法運(yùn)算從241個(gè)時(shí)鐘周期減少到4個(gè)時(shí)鐘周期,而除法則由原來的¨lO個(gè)時(shí)鐘周期減少到4個(gè)時(shí)鐘周期,可見硬件浮點(diǎn)運(yùn)算器使8051在運(yùn)算能力上有了質(zhì)的提高。 筆者也在“Google”和“百度”搜索引擎上,以及“維普數(shù)據(jù)論文網(wǎng)’’上搜索過,都沒有發(fā)現(xiàn)有類似的設(shè)計(jì),帶硬件浮點(diǎn)運(yùn)算器的8051可謂是一次創(chuàng)新,希望在實(shí)際應(yīng)用中能有用武之地。
標(biāo)簽: FPGA 8051 硬件 浮點(diǎn)運(yùn)算器
上傳時(shí)間: 2013-04-24
上傳用戶:13081287919
General Description The LM621 is a bipolar IC designed for commutation of brushless DC motors. The part is compatible with both three- and four-phase motors. It can directly drive the power switching devices used to drive the motor. The LM621 provides an adjustable dead-time circuit to eliminate ``shootthrough'' current spiking in the power switching circuitry. Operation is from a 5V supply, but output swings of up to 40V are accommodated. The part is packaged in an 18-pin, dual-in-line package.
上傳時(shí)間: 2013-07-24
上傳用戶:sdq_123
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