Modulation in Electronics and Telecommunications [Working Title]最新文献

Modulation in Electronics and Telecommunications [Working Title] Pub Date : 2020-03-13 DOI: 10.5772/intechopen.91687

A. Hazeri

{"title":"Review of Injected Oscillators","authors":"A. Hazeri","doi":"10.5772/intechopen.91687","DOIUrl":"https://doi.org/10.5772/intechopen.91687","url":null,"abstract":"Oscillators are critical components in electrical and electronic engineering and other engineering and sciences. Oscillators are classified as free-running oscillators and injected oscillators. This chapter describes the background necessary for the analysis and design of injected oscillators. When an oscillator is injected by an external periodic signal mentioned as an injection signal, it is called an injected oscillator. Consequently, two phenomena occur in the injected oscillators: (I) pulling phenomena and (II) locking phenomena. For locking phenomena, the oscillation frequency of the injection signal must be near free-running oscillation frequency or its sub-/super-harmonics. Due to these phenomena are nonlinear phenomena, it is tough to achieve the exact equation or closed-form equation of them. Therefore, researchers are scrutinizing them by different analytical and numerical methods for accomplishing an exact inside view of their performances. In this chapter, injected oscillators are investigated in two main subjects: first, analytical methods on locking and pulling phenomena are reviewed, and second, applications of injected oscillators are reviewed such as injection-locked frequency dividers at the latter. Furthermore, methods of enhancing the locking range are introduced.","PeriodicalId":320164,"journal":{"name":"Modulation in Electronics and Telecommunications [Working Title]","volume":"56 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123015336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Review: Circuit Theory of Microstrip Antennas for Dual-, Multi-, and Ultra-Widebands 双、多、超宽带微带天线电路理论综述

Modulation in Electronics and Telecommunications [Working Title] Pub Date : 2020-03-02 DOI: 10.5772/intechopen.91365

Ashish Singh, Krishnananda Shet, Durga Prasad, A. Pandey, M. Aneesh

引用次数: 6

Perfect Signal Transmission Using Adaptive Modulation and Feedback 使用自适应调制和反馈的完美信号传输

Modulation in Electronics and Telecommunications [Working Title] Pub Date : 2020-02-13 DOI: 10.5772/INTECHOPEN.90516

A. Platonov

{"title":"Perfect Signal Transmission Using Adaptive Modulation and Feedback","authors":"A. Platonov","doi":"10.5772/INTECHOPEN.90516","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.90516","url":null,"abstract":"The research results show that adaptive adjusting of modulators over feedback enables development of the “ perfect ” communication system (CS) transmitting analog and digital signals in real-time without coding with a bit rate equal to the forward channel capacity and limit energy spectral efficiency. These and other feasibilities unattainable for known CS are the result of transition from the direct transmission of samples of the input signal to the transmission of sequences of their estimation errors cyclically formed at the input of forward transmitter (FT) modulator. Each transmitted error is formed as a difference between the value of input sample and its current estimate computed in the receiver in previous cycle and delivered to FT over feedback. Growing accuracy of estimates decreases estimation errors and permits their transmission permanently increasing the modulation index and maximizing the amount of information delivered to the receiver. Unlike CS with coding, adaptive feedback CS (AFCS) can be optimized using Bayesian estimation and information theory. Absence of coders simplifies the construction of FT and reduces their energy consumption and cost. Moreover, adaptive properties of AFCS permit to maintain the perfect mode of transmission in every scenario of application. The chapter presents analytical backgrounds, experiments results and research genesis including the reasons for absence of AFCS in modern communications.","PeriodicalId":320164,"journal":{"name":"Modulation in Electronics and Telecommunications [Working Title]","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115363420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Optical Phase-Modulation Techniques 光相位调制技术

Modulation in Electronics and Telecommunications [Working Title] Pub Date : 2019-12-09 DOI: 10.5772/intechopen.90343

Ramón José Pérez Menéndez

引用次数: 0

Integrated Electro-Optics Modulator 集成电光调制器

Modulation in Electronics and Telecommunications [Working Title] Pub Date : 2019-07-17 DOI: 10.5772/INTECHOPEN.88078

Yufeng Tao

引用次数: 0

Polarization Modulation 偏振调制

Modulation in Electronics and Telecommunications [Working Title] Pub Date : 2019-07-12 DOI: 10.1007/springerreference_21669

I. Toyoda

引用次数: 7

Digital Algebraic Method for Processing Complex Signals for Radio Monitoring Systems 无线电监测系统中复杂信号处理的数字代数方法

Modulation in Electronics and Telecommunications [Working Title] Pub Date : 2019-04-30 DOI: 10.5772/INTECHOPEN.85590

Sergey Rassomakhin

引用次数: 0