調(diào)制解調(diào)課程設(shè)計 16QAM調(diào)制解調(diào)代碼。包括星座圖，頻譜分析，誤碼率分析。-16QAM modulatIOn and demodulatIOn curriculum design code modulatIOn and demodulatIOn. Including constellation, spectrum analysis, bit error rate analysis.
上傳時間： 2016-05-02
上傳用戶：ylqylq
16qam 隨著現(xiàn)代通信技術(shù)的發(fā)展， 特別是移動通信技術(shù)高速發(fā)展， 頻帶利用率問題 越來越被人們關(guān)注。 在頻譜資源非常有限的今天， 傳統(tǒng)通信系統(tǒng)的容量已經(jīng)不能 滿足當(dāng)前用戶的要求。正交幅度調(diào)制 QAM(Quadrature Amplitude modulatIOn) 以其高頻譜利用率、 高功率譜密度等優(yōu)勢， 成為寬帶無線接入和無線視頻通信的 重要技術(shù)方案。 隨著現(xiàn)代通信技術(shù)的發(fā)展， 特別是移動通信技術(shù)高速發(fā)展， 頻帶利用率問題 越來越被人們關(guān)注。 在頻譜資源非常有限的今天， 傳統(tǒng)通信系統(tǒng)的容量已經(jīng)不能 滿足當(dāng)前用戶的要求。正交幅度調(diào)制 QAM(Quadrature Amplitude modulatIOn) 以其高頻譜利用率、 高功率譜密度等優(yōu)勢， 成為寬帶無線接入和無線視頻通信的 重要技術(shù)方案。
上傳時間： 2016-06-26
上傳用戶：guh000
Optical communication technology has been extensively developed over the last 50 years, since the proposed idea by Kao and Hockham [1]. However, only during the last 15 years have the concepts of communication foundation, that is, the modulatIOn and demodulatIOn techniques, been applied. This is pos- sible due to processing signals using real and imaginary components in the baseband in the digital domain. The baseband signals can be recovered from the optical passband region using polarization and phase diversity tech- niques, as well as technology that was developed in the mid-1980s.
標(biāo)簽： Transmission Processing Digital Optical
上傳時間： 2020-05-27
上傳用戶：shancjb
Multi-carrier modulatIOn? Orthogonal Frequency Division Multi- plexing (OFDM) particularly? has been successfully applied to a wide variety of digital communications applications over the past several years. Although OFDM has been chosen as the physical layer standard for a diversity of important systems? the theory? algorithms? and implementation techniques remain subjects of current interest. This is clear from the high volume of papers appearing in technical journals and conferences.
標(biāo)簽： COMMUNICATIONS MULTI-CARRIER DIGITAL
上傳時間： 2020-05-31
上傳用戶：shancjb
All wireless communication standards, existing and under development, adopt or consider adopting orthogonal frequency-division multiplexing (OFDM) as the modulatIOn technique. It is clear that OFDM has become the definitive modulatIOn scheme in current and future wireless communication systems.
標(biāo)簽： Baseband Receiver Design OFDM
上傳時間： 2020-05-31
上傳用戶：shancjb
T his book covers basic communications theory and practical imple- mentation of transmitters and receivers. In so doing, I focus on dig- ital modulatIOn, demodulatIOn methods, probabilities, detection of digital signals, and spread spectrum system design and analysis. This book was written for those who want a good understanding of the basic prin- ciples of digital wireless communication systems, including spread spec- trum techniques. This book also provides a good intuitive and practical approach to digital communications. Therefore it is a valuable resource for anyoneinvolvedinwirelesscommunicationsandtransceiverdesignfordig- ital communications. The reader will gain a broad understanding of basic communication principles for transceiver design, digital communications, and spread spectrum, along with examples of many types of commercial and military data link systems.
標(biāo)簽： Transceiver System Design
上傳時間： 2020-06-01
上傳用戶：shancjb
Introduction to Radio Frequency Identification (RFID): RFID is a wireless modulatIOn and demodulatIOn technique for automatic identification of objects, tracking goods, smart logistics, and access con- trol. RFID is a contactless, usually short‐distance transmission and reception technique for unique ID data transfer from a tagged object to an interrogator (reader). The generic configuration of an RFID system comprises (i) an ID data‐carrying tag, (ii) a reader, (iii) a middleware, and (iv) an enterprise application.
標(biāo)簽： Chipless_Radio_Frequency_Identifi cation
上傳時間： 2020-06-08
上傳用戶：shancjb
The purpose of this book is to present detailed fundamental information on a global positioning system (GPS) receiver. Although GPS receivers are popu- larly used in every-day life, their operation principles cannot be easily found in one book. Most other types of receivers process the input signals to obtain the necessary information easily, such as in amplitude modulatIOn (AM) and frequency modulatIOn (FM) radios. In a GPS receiver the signal is processed to obtain the required information, which in turn is used to calculate the user position. Therefore, at least two areas of discipline, receiver technology and navigation scheme, are employed in a GPS receiver. This book covers both areas.
標(biāo)簽： Fundamentals_of_Global_Positionin g_System_Receivers
上傳時間： 2020-06-09
上傳用戶：shancjb
BUCKBOOST電路原理分析uck變換器：也稱降壓式變換器，是一種輸出電壓小于輸入電壓的單管不隔離直流變換器。 圖中，Q為開關(guān)管，其驅(qū)動電壓一般為PWM(Pulse、width、modulatIOn脈寬調(diào)制)信號，信號周期為Ts，則信號頻率為f=1/Ts，導(dǎo)通時間為Ton，關(guān)斷時間為Toff，則周期Ts=Ton+Toff，占空比Dy=、Ton/Ts。 Boost變換器：也稱升壓式變換器，是一種輸出電壓高于輸入電壓的單管不隔離直流變換器。 開關(guān)管Q也為PWM控制方式，但最大占空比Dy必須限制，不允許在Dy=1的狀態(tài)下工作。電感Lf在輸入側(cè)，稱為升壓電感。Boost變換器也有CCM和DCM兩種工作方式 Buck/Boost變換器：也稱升降壓式變換器，是一種輸出電壓既可低于也可高于輸入電壓的單管不隔離直流變換器，但其輸出電壓的極性與輸入電壓相反。Buck/Boost變換器可看做是Buck變換器和Bo
上傳時間： 2021-10-18
上傳用戶：
近距電能傳輸——高效安全近距電能傳輸一般基于電磁感應(yīng)原理進(jìn)行。在此技術(shù)基礎(chǔ)上，當(dāng)接收器鄰近發(fā)射器時才會進(jìn)行電能傳輸。電磁感應(yīng)技術(shù)的歷史長達(dá)百年，多年米一直應(yīng)用于各類電子產(chǎn)品中—如此普及全因其簡單、高效以及安全技術(shù)概覽以下將為你簡要介紹無線電能傳輸技術(shù)。System Overview(Communication)Receiver sends messagesTo provide control information to the transmitterBy load modulatIOn on the power signaTransmitter receives messagesTo receive control information frorn the recelverBy de-modulatIOn of the reflected loadPower Pick Up( Receiver)Secondary coil (L Serial resonance capacitor (C) for efficient power transfer Parallel resonance capacitor(C, )for detection purposes Rectifier: full bridge(diode, or switched)+ capacitor Output switch for(dis)connecting the loadReceiver modulates load by Switching modulatIOn resistor(R,n),or Switching modulatIOn capacitor(Ca)Transmitter de-modulates reflected load by Sensing pnmary coil curent (p)and/o Sensing primary coil voltage (V,
上傳時間： 2022-03-31
上傳用戶：
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