We are proudly a Ukrainian website. Our country was attacked by Russian Armed Forces on Feb. 24, 2022.
You can support the Ukrainian Army by following the link: https://u24.gov.ua/.
Even the smallest donation is hugely appreciated!
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Digital communications".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Статті в журналах з теми "Digital communications":
1
Hattori, Takeshi. "Digital Mobile Communications. Digital Mobile Communications Network." Journal of the Institute of Television Engineers of Japan 49, no. 6 (1995): 722–29. http://dx.doi.org/10.3169/itej1978.49.722.
Rahmawati, Devie, Giri Lumakto, and Deni Danial Kesa. "Generasi Digital Natives dalam Praktik Konsumsi Berita di Lingkungan Digital." Communications 2, no. 2 (July 31, 2020): 74–98. http://dx.doi.org/10.21009/communications.2.2.5.
Dominasi interaksi warga di dunia digital masih menyisakan ketidaksetaraan antar generasi. Walau data menunjukkan dari 268 juta penduduk Indonesia, terdapat 355 juta pengguna seluler (133%). Dimana 91% mengakses informasi melalui ponsel, mayoritas interaksi digital ini berasal digital native. Digital natives (17-34 tahun) adalah generasi yang lahir berdampingan dengan perkembangan teknologi. Sedang digital immigrants (45-65 tahun) lahir sebelum teknologi digital berkembang pesat. Penelitian ini menggunakan pendekatan kualitatif. Metode pengumpulan data menggunakan teknik dua kali wawancara dengan FGD dengan 55 orang responden. Ke 55 responden berasal dari digital natives (20) dan digital immigrants (35). Teknik wawancara menggunakan tidak terstruktur. Dengan analisis data bersifat deskriptif. Penelitian ini menemukan adanya misinterpretasi kompetensi digital, terutama dalam konsumsi informasi hoaks. Dibandingkan dengan generasi digital immigrant dalam mengkonsumsi berita, digital natives menunjukkan ketimpangan schemata dalam mengenali informasi digital. Kedua generasi masih mudah terprovokasi dengan kandungan emosional hoaks. Terjadi kendala untuk digital natives merubah kondisi sosial atas persebaran berita hoaks (digital divide). Pola patron-client menjadi salah satu penyebab hoaks menjadi informasi yang dipercaya juga oleh digital natives.
4
Bunday, D. C. "Advanced Digital Communications." Electronics and Power 33, no. 9 (1987): 587. http://dx.doi.org/10.1049/ep.1987.0360.
Kanaya, Manabu. "Digital Mobile Communications. Current Status and Trend of Digital Mobile Communications." Journal of the Institute of Television Engineers of Japan 49, no. 6 (1995): 717–21. http://dx.doi.org/10.3169/itej1978.49.717.
Mizuno, Toshio. "Digital Mobile Communications. Application of Mobile Communications." Journal of the Institute of Television Engineers of Japan 49, no. 6 (1995): 743–49. http://dx.doi.org/10.3169/itej1978.49.743.
Kennedy, Michael Peter, and Géza Kolumbán. "Digital communications using chaos." Signal Processing 80, no. 7 (July 2000): 1307–20. http://dx.doi.org/10.1016/s0165-1684(00)00038-4.
Titov, S. A., and N. V. Titova. "ORGANIZATIONAL SUBCULTURAL DYNAMICS IN DIGITAL TRANSOFORMATION PROJECTS." Strategic decisions and risk management 11, no. 3 (January 13, 2021): 294–303. http://dx.doi.org/10.17747/2618-947x-2020-3-294-303.
The article aims to investigate the negative impact from organizational subcultural dynamics in digital transformation projects on number of conflicts and quality of communications and to elaborate proposals how to improve cross-subcultural communications within the projects. The methodology of the study includes participatory action research and case study. The network model of project culture helped to identify two cultural coalitions and their values. The model of the subcultural coalitions and their values helped to formulate the scope of communicational trainings and changed in the project communication system. The focus of the measures was on the preservation of the existing subcultures and on the improvement on the cross-subcultural communications. Comparing the number of conflicts within project before implementation of the measures based on the research and after it showed significant positive impact of these measures. The main findings show that in multidisciplinary and complex projects, such as digital transformation projects, subcultural dynamics can lead to formation of different coalition that do not share common values. This can be the source of the conflicts and low quality of communications. However, using the knowledge of coalitions’ structure and values the management of companies can enhance cross-subcultural interfaces without decreasing positive effect from subcultural diversity.
Sen, Cem. "Digital communications jamming." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA383913.
Thesis (M.S. in Systems Engineering) Naval Postgraduate School, Sept. 2000. Thesis advisor(s): Smith, Rasler W.; Lebaric, Jovan. Includes bibliographical references (p. 137-139). Also available online.
2
Michaels, Alan Jason. "Digital chaotic communications." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34849.
This dissertation provides the conceptual development, modeling and simulation, physical
implementation, and measured hardware results for a practicable digital coherent chaotic
communication system. Such systems are highly desirable for robust communications due to
the maximal entropy signal characteristics that satisfy Shannon's ideal noise-like waveform
and provide optimal data transmission across a flat communications channel. At the core of
the coherent chaotic communications system is a fully digital chaotic circuit, providing an
efficiently controllable mechanism that overcomes the traditional bottleneck of chaotic circuit
state synchronization. The analytical, simulation, and hardware results yield a generalization of direct sequence spread spectrum waveforms, that can be further extended to create a new class of maximal entropy waveforms suitable for optimized channel performance, maximal entropy transmission of chaotically spread amplitude modulated data constellations, and
permission-based multiple access systems.
3
Jiang, Xiaofeng. "Multipoint digital video communications." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239548.
Tsai, Tsung-Heng. "Time-interleaved analog-to-digital converters for digital communications /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.
Schmelzer, Raymond Matthew. "Practical Wired Digital Communications Link Analysis." PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/3143.
This thesis deals with the analysis of a Wired High Speed Serial Data Link (PAM2) which is commonly used throughout the data-communications and tele-communications industry. The goal of this study is to build a scalable simulation tool using Matlab that ultimately uses Receiver Bit Error Ratio (BER) as the metric for data link health. This study is also designed to aid in link specification development.
The Matlab and theoretical development is broken up into three sections being Transmitter (TX), Channel (Hs) and Receiver (RX). Realistic noise impairments can be added to each section along the signal path creating signal stresses commonly seen in data center applications. The TX function is designed to create random and periodic timing jitter, voltage noise and deterministic pre-distortion filtering effects. For the channel response s-parameters are used as the model result for many commonly seen channel loss and reflection scenarios. The RX model uses signal to noise ratio and vertical eye margin to determine the equalized link BER.
The study results show many tradeoffs between noises, RX Equalizer, RX gain and RX BER. The simulation results also reveal that there is no closed form solution for converging the modern closed-eye PAM2 detector.
6
Talal, Mohammed. "Modem design for digital satellite communications." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/7442.
The thesis is concerned with the design of a phase-shift keying system for a digital modem, operating over a satellite link. Computer simulation tests and theoretical analyses are used to assess the proposed design. The optimum design of both transmitter and receiver filters for the system to be used in the modem are discussed. Sinusoidal roll-off spectrum with different roll-off factor and optimum truncation lengths of the sample impulse response are designed for the proposed scheme to approximate to the theoretical ideal. It has used an EF bandpass filter to band limit the modulated signal, which forms part of the satellite channel modelling. The high power amplifier (HPA) at the earth station has been used in the satellite channel modelling due to its effect in introducing nonlinear AMAM and AM-PM conversion effects and distortion on the transmitted signal from the earth station. The satellite transponder is assumed to be operating in a linear mode. Different phase-shift keying signals such as differentially encoded quaternary phase-shift keying (DEQPSK), offset quaternary phase-shift keying (OQPSK) and convolutionally encoded 8PSK (CE8PSK) signals are analysed and discussed in the thesis, when the high power amplifier (HPA) at the earth station is operating in a nonlinear mode. Convolutional encoding is discussed when applied to the system used in the modem, and a Viterbi -algorithm decoder at the receiver has been used, for CE8PSK signals for a nonlinear satellite channel. A method of feed-forward synchronisation scheme is designed for carrier recovery in CE8PSK receiver. The thesis describes a method of baseband linearizing the baseband signal in order to reduce the nonlinear effects caused by the HPA at the earth station. The scheme which compensates for the nonlinear effects of the HPA by predistorting the baseband signal prior to modulation as opposed to correcting the distortion after modulation, thus reducing the effects of nonlinear distortion introduced by the HPA. The results of the improvement are presented. The advanced technology of digital signal processors (DSPs) has been used in the implementation of the demodulation and digital filtering parts of the modem replacing large parts of conventional circuits. The Viterbi-algorithm decoder for CE8PSK signals has been implemented using a digital signal processor chip, giving excellent performance and is a cost effective and easy way for future developments and any modifications, The results showed that, by using the various studied techniques, as well as the implementation of digital signal processor chip in parts of the modem, a potentially more cost effective modem can be obtained.
7
Waegemans, R. "Digital electronic predistortion for optical communications." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/20007/.
The distortion of optical signals has long been an issue limiting the performance of communication systems. With the increase of transmission speeds the effects of distortion are becoming more prominent. Because of this, the use of methods known from digital signal processing (DSP) are being introduced to compensate for them. Applying DSP to improve optical signals has been limited by a discrepancy in digital signal processing speeds and optical transmission speeds. However high speed Field Programmable Gate Arrays (FPGA) which are sufficiently fast have now become available making DSP experiments without costly ASIC implementation possible for optical transmission experiments. This thesis focuses on Look Up Table (LUT) based digital Electronic Predistortion (EPD) for optical transmission. Because it is only one out of many possible implementations of EPD, it has to be placed in context with other EPD techniques and other distortion combating techniques in general, especially since it is possible to combine the different techniques. Building an actual transmitter means that compromises and decisions have to be made in the design and implementation of an EPD based system. These are based on balancing the desire to achieve optimal performance with technological and economic limitations. This is partly done using optical simulations to asses the performance. This thesis describes a novel experimental transmitter that has been built as part of this research applying LUT based EPD to an optical signal. The experimental transmitter consists of a digital design (using a hardware description language) for a pair of FPGAs and an analogue optical/electronic setup including two standard DAC integrated circuits. The DSP in the transmitter compensated for both chromatic dispersion and self phase modulation. We achieved transmission of 10.7 Gb/s non-return-to-zero (NRZ) signals with a +4 dBm launch power over 450 km keeping the required optical-signal-to-noise-ratio (OSNR) for a bit-error-rate of 2x10^{-3} below 11 dB. In doing so we showed experimentally, for the first time, that nonlinear effects can be compensated with this approach and that the combination of FPGA-DAC is a viable approach for an experimental setup.
8
Poirrier, Julien. "Electronic Mitigation of Polarization Mode Dispersion." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34469.
Polarization Mode Dispersion induces polarization dependent propagation. Consequently it generates a multiple imaging of the light pulse carrying the information. Its first order appears as a dual path fading channel of Maxwellian statistics. It results in harmful impairments that prevent the upgrade and installation of high bit-rate systems. The random process PMD exhibits a strong frequency dependence, so that its amelioration requires channel by channel, non-linear, adaptive mitigation. Electronic mitigation appears as a very attractive solution to overcome the limit set by the PMD.
Consequently, we considered the implementation of these solutions at the receiver in the electrical domain. We verified that these linear and non-linear equalization techniques can greatly reduce the power penalty due to PMD. Equalization's performance depends highly on the type of systems considered. For the two main types of systems: thermal noise limited systems and systems exhibiting ASE (systems using optical amplifiers), we demonstrated and quantified the induced improvement (measured as power penalty reduction). The most sophisticated technique that we considered (NLC+FDE) handles any kind of first order PMD within a 4 dB margin in the thermal noise limit. This extended to a 11 dB margin in the presence of ASE. This comes from the limitation set by the signal dependence of the noise. In fact, these DSP techniques do a better job at reducing very high penalty. Consequently, for a power and ISI limited link, it may be required to associate to electronic solutions optical compensation in order to reach acceptable performance. On the other hand, for links having large power margin or exhibiting reasonable PMD, electronic techniques appear as an easy, inexpensive and convenient solution.
We derived in this work the bounds to NLC performance in the presence of ASE. Therefore, we extended the usual results of the thermal noise limit to the particular case of signal dependent noise. We also made clear that optical systems, because of their noise specificities can not be studied or designed as others links. Notions such as eye opening, SNR and ISI need to be carefully defined and adapted to this case.
We have provided in this work PMD dependent power penalty map for known systems. Given the link's statistics and characteristics, one can determine, following our structure, which mitigation techniques allow upgrade. Master of Science
9
Rockliff, Simon C. "Frequency hopping techniques for digital mobile radio /." Title page, contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phr683.pdf.
This dissertation explores the role soft control plays in the relationship between the television industry and short forms of digital media. Following James Beniger and Tizianna Terranova, I define soft control as the purposive movement by the television industry towards shaping audience attention toward predetermined goals through a range of interactions where development happens somewhat autonomously, while being interjected with commands over time. I define such things as media environment design, branding, and data collection as soft control practices. I focus on television as a way to understand how an industry historically patterned around more rigid forms of audience control deals with a digital media environment often cited for its lack of control features. And while there is already a robust discussion on the shifting strategies for the online distribution of shows, there is less of a focus on the increasing importance of shorter forms of digital media to the everyday operation of the television industry. Shorter forms of media include digitally circulated short videos, songs, casual digital games, and even social media, which is itself a platform for the distribution of shorter forms of media. I refer to all these forms of short media as "micromedia" and focus my interest on how various television companies are dealing with media environments saturated with it.
To do this I look at, for instance, how television companies use the data available on Twitter and appropriate the user-generated content of audiences, as well as how standard digital communication interfaces are utilized to more easily retrofit previous audience retention practices into new digital environments. Through the investigation of how television creates and appropriates micromedia as a way to reconfigure practices into the everyday lives of participatory audiences, I argue that we can see soft control elements at work in structuring the industry-audience relationship. These soft control features call into question the emancipatory role attributed to participatory audiences and digital technologies alike. If we think about media forms in their specific contexts, making sure to focus on their intermedial connections and their materiality, we can complicate ideas about what the categories of audience or industrial control mean.
Christopoulos, C., and A. Wright. "Digital communications." In Electrical Power System Protection, 479–500. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4757-5065-2_13.
Olson, Tim. "Digital Communications." In Applied Fourier Analysis, 177–203. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7393-4_6.
Warnes, L. A. A. "Digital communications." In Electronic and Electrical Engineering, 476–90. London: Macmillan Education UK, 1994. http://dx.doi.org/10.1007/978-1-349-13012-2_24.
Sadiku, Matthew N. O., and Cajetan M. Akujuobi. "Digital Communications." In Fundamentals of Computer Networks, 7–18. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09417-0_2.
Barry, John R., Edward A. Lee, and David G. Messerschmitt. "MIMO Communications." In Digital Communication, 461–536. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-1-4615-0227-2_10.
Malepati, Hazarathaiah. "Digital Communications." In Digital Media Processing, 437–508. Elsevier, 2010. http://dx.doi.org/10.1016/b978-1-85617-678-1.00009-0.
Тези доповідей конференцій з теми "Digital communications":
1
Riaz, Anjam, and Maaruf Ali. "Chaotic Communications, their applications and advantages over traditional methods of communication." In Digital Signal Processing (CSNDSP). IEEE, 2008. http://dx.doi.org/10.1109/csndsp.2008.4610808.
Suri, S. "Amateur radio in emergency communications advanced digital communication network." In the 1st International Conference. New York, New York, USA: ACM Press, 2011. http://dx.doi.org/10.1145/2185216.2185233.
Glenn, William E., and Ed Daly. "Two-way digital communications." In Space technology and applications international forum: 1st conference on commercial development of space; 1st conference on next generation launch systems; 2nd spacecraft thermal control symposium; 13th symposium on space nuclear power and propulsion. AIP, 1996. http://dx.doi.org/10.1063/1.50027.
"Session MP8a4: Digital communications." In 2014 48th Asilomar Conference on Signals, Systems and Computers. IEEE, 2014. http://dx.doi.org/10.1109/acssc.2014.7094502.
Wang, Ziran. "Motion Estimation of Connected and Automated Vehicles under Communication Delay and Packet Loss of V2X Communications." In SAE WCX Digital Summit. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2021. http://dx.doi.org/10.4271/2021-01-0107.
RUCKER, RICHARD, and GEORGE FLATHERS. "The future of aeromobile digital communications." In Digital Avionics Systems Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-4001.
Lyon, D. L. "Trends in digital wireless communications." In 1996 54th Annual Device Research Conference Digest. IEEE, 1996. http://dx.doi.org/10.1109/drc.1996.546292.
Goldsmith, B. J. "Implementation of digital voice communications." In International Broadcasting Convention - IBC '94. IEE, 1994. http://dx.doi.org/10.1049/cp:19940763.
Koivisto, Matti. "Acceptance and use of mobile phone mediated communication technologies in community communications." In 2007 2nd International Conference on Digital Information Management. IEEE, 2007. http://dx.doi.org/10.1109/icdim.2007.4444311.
Rhodes, Charles W. "Interference to digital broadband communications and spread spectrum communications." In 2012 IEEE International Conference on Consumer Electronics (ICCE). IEEE, 2012. http://dx.doi.org/10.1109/icce.2012.6161869.
Звіти організацій з теми "Digital communications":
1
Robertson, R. C., and Nathan E. Beltz. Digital Communications Over Fading Channels. Fort Belvoir, VA: Defense Technical Information Center, November 2004. http://dx.doi.org/10.21236/ada429011.
Schmelzer, Raymond. Practical Wired Digital Communications Link Analysis. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.3136.
Biglieri, Ezio, and Michele Elia. Applications of Signal Processing in Digital Communications. Fort Belvoir, VA: Defense Technical Information Center, January 1987. http://dx.doi.org/10.21236/ada190420.
Elia, Michele. Applications of Signal Processing in Digital Communications. Fort Belvoir, VA: Defense Technical Information Center, November 1987. http://dx.doi.org/10.21236/ada190422.
Barrios, Amalia E., Veena Gadwal, and Richard Sprague. Modeling RF Digital Signals for Communications Applications. Fort Belvoir, VA: Defense Technical Information Center, September 2009. http://dx.doi.org/10.21236/ada531221.
Aiken, John. ADST Operations Manual. AIRNET Digital Message Communications Console. Fort Belvoir, VA: Defense Technical Information Center, February 1993. http://dx.doi.org/10.21236/ada283295.
Aiken, John. ADST Operations Manual. AIRNET Digital Message Communications Console. Fort Belvoir, VA: Defense Technical Information Center, September 1993. http://dx.doi.org/10.21236/ada283296.
Bogusch, Robert L. Digital Communications in Fading and Jamming-COMLINK Users' Manual. Fort Belvoir, VA: Defense Technical Information Center, April 2002. http://dx.doi.org/10.21236/ada401136.
Baldoza, Arnold C. Data Embedding for Covert Communications, Digital Watermarking, and Information Augmentation. Fort Belvoir, VA: Defense Technical Information Center, March 2000. http://dx.doi.org/10.21236/ada375890.
Zoltowski, Michael D. Conjugate Gradient Based Reduced-Rank Signal Processing for Military Digital Communications. Fort Belvoir, VA: Defense Technical Information Center, May 2007. http://dx.doi.org/10.21236/ada472926.
