Готові списки джерел за темами / Transmitter systems

Добірка наукової літератури з теми "Transmitter systems"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Transmitter systems"

1

Sharma, Naresh, and P. G. Poonacha. "Obtaining Synchronization for a Class of Chaotic Systems." International Journal of Bifurcation and Chaos 07, no. 11 (November 1997): 2587–92. http://dx.doi.org/10.1142/s0218127497001746.

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An iterative algorithm is proposed for constructing synchronizing receivers for a chosen class of chaotic transmitter systems. A complete knowledge of the transmitter system is not required. Identical synchronization is ensured with the transmitted signal in the constructed receivers. Potential applications of the method are discussed for communications.
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2

LU, HONGTAO, and WALLACE K. S. TANG. "CHAOTIC PHASE SHIFT KEYING IN DELAYED CHAOTIC ANTICONTROL SYSTEMS." International Journal of Bifurcation and Chaos 12, no. 05 (May 2002): 1017–28. http://dx.doi.org/10.1142/s0218127402004887.

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Based on the delayed feedback chaotic anticontrol systems, a new chaotic phase shift keying (CPSK) scheme is proposed for secure communications in this paper. The chaotic transmitter is a linear system with nonlinear delayed feedback in which a trigonometric function cos(·) is used. Such system can exhibit rich chaotic behavior with the choice of appropriate parameters. For an M-ary communication system where M=2n, each of these M possible symbols (n-bits) is firstly mapped to 2(m-1)π/M (with m=1, 2, …, M) which is used as the phase argument for the cos(·) function in the nonlinear feedback. Two different kinds of signals can be transmitted. In the first one, an appropriate linear combination of state variables is chosen as the transmitting signal based on the observer theory. In another one, a nonlinear component in the transmitter state equation is chosen. In both schemes, only a scalar chaotic signal is transmitted through the channel. Demodulation is based on the synchronization of the transmitter and the receiver, and different decoded phases correspond to different information signals.
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3

Raghavendran, CH V., G. Naga Satish, M. V. Rama Sundari, and P. Suresh Varma. "Tandem Communication Network Model with DBA having Non Homogeneous Poisson arrivals and Feedback for First Node." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 13, no. 9 (September 30, 2014): 4922–32. http://dx.doi.org/10.24297/ijct.v13i9.2372.

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In this paper, we develop a two node tandem communication network model with dynamic bandwidth allocation and feedback for the first node. In most of the communication systems, the arrivals of packets follow Non-Homogeneous and arrival rate is time dependent. In this model, the transmission rate of each transmitter depends on the number of packets in the buffer connected it. The transmission rates at each transmitter are adjusted depending upon the content of the buffer connected to it. The packets transmitted through the first transmitter may be forwarded to the buffer connected to the second transmitter or returned back to the first buffer with certain probabilities. Using the difference-differential equations the performance measures including average number of packets in each buffer, the probability of emptiness of the network, the average waiting time in the buffer and in the network, the throughput of the transmitters, and the variance of the number of packets in the buffer are calculated. It is observed that the load dependent transmission can reduce the delays in the transmission and enhance the channel capacity.Â
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4

Baek, Jieun, and Yosoon Choi. "A New GIS-Based Algorithm to Support Initial Transmitter Layout Design in Open-Pit Mines." Energies 11, no. 11 (November 7, 2018): 3063. http://dx.doi.org/10.3390/en11113063.

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In this paper, a new geographic information systems (GIS)-based algorithm is proposed for supporting the initial design of a wireless communications system in open-pit mines. In this algorithm, multiple candidate transmitter (wireless access point) locations are selected considering the probability of further development and environmental factors in the mine. Then, a three-dimensional (3D) partial Fresnel zone between the transmitter and the receiver is defined and its 3D Fresnel index calculated by communication viewshed analysis of topographic data. The initial design for a transmitter layout is then determined based on the 3D Fresnel indices, which are calculated for all candidate transmitter locations. The proposed algorithm was applied to an open-pit mine located in Samcheok-si, Gangwon-do, South Korea. The 3D Fresnel indices were calculated for 15 candidate transmitter locations, and an initial transmitter layout then designed considering favorable combinations of two, three, and four transmitters. The proposed algorithm provided more precise Fresnel index overlay maps for the favorable transmitter candidate combinations than other algorithms based on line-of-sight and two-dimensional partial Fresnel zone analyses. Application of the algorithm to an open-pit mine where a wireless communications system is already installed revealed that the initial transmitter layout design is acceptable in terms of providing reasonable information on the coverage area of transmitters. Because the proposed algorithm provides an initial transmitter layout that can be modified after field investigations, it can support efficient design of wireless communications systems for use in open-pit mines.
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5

YOSHIMURA, K. "SECURE COMMUNICATIONS USING CASCADED CHAOTIC OPTICAL RINGS." International Journal of Bifurcation and Chaos 14, no. 03 (March 2004): 1105–13. http://dx.doi.org/10.1142/s0218127404009661.

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We show that transmitter and receiver systems consisting of cascaded chaotic optical rings can synchronize when they are coupled by using direct light injection from the transmitter into the receiver. Binary messages can be transmitted by the chaotic switching scheme. The proposed chaos secure communication system can satisfy some requirements to enhance security.
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6

Chau, Jorge Luis, Juan Miguel Urco, Juha Pekka Vierinen, Ryan Andrew Volz, Matthias Clahsen, Nico Pfeffer, and Jörg Trautner. "Novel specular meteor radar systems using coherent MIMO techniques to study the mesosphere and lower thermosphere." Atmospheric Measurement Techniques 12, no. 4 (April 5, 2019): 2113–27. http://dx.doi.org/10.5194/amt-12-2113-2019.

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Abstract. Typical specular meteor radars (SMRs) use one transmitting antenna and at least a five-antenna interferometric configuration on reception to study the mesosphere and lower thermosphere (MLT) region. The interferometric configuration allows the measurement of the angle-of-arrival (AOA) of the detected meteor echoes, which in turn is needed to derive atmospheric parameters (e.g., mean winds, momentum fluxes, temperatures, and neutral densities). Recently, we have shown that coherent MIMO configurations in atmospheric radars, i.e., multiple input (transmitters) and multiple output (receivers), with proper diversity in transmission can be used to enhance interferometric atmospheric and ionospheric observations. In this study we present novel SMR systems using multiple transmitters in interferometric configuration, each of them employing orthogonal pseudorandom coded transmitted sequences. After proper decoding, the angle of departure (AOD) of the detected meteor echoes with respect to the transmitter site are obtained at each receiving antenna. We present successful bistatic implementations of (1) five transmitters and one receiver using coded continuous wave (CW) (MISO-CW), and (2) five transmitters and five receivers using coded CW (MIMO-CW). The latter system allows simultaneous independent observations of the specular meteor trails with respect to the transmitter (AOD) and with respect to the receiver (AOA). The quality of the obtained results is evaluated in terms of the resulting mean winds, the number of detections and the daily diffusion trail vs. altitude behavior. We show that the proposed configurations are good alternatives to explore the MLT region. When combined with multi-static approaches, they can increase the number of meteor detections, thereby improving the quality of atmospheric estimates and allowing the measurement of new atmospheric parameters (e.g., horizontal divergence, vorticity), The use of multiple collocated transmitters for interferometric AOD determination makes building a multi-static radar network easier logistically, as only one receiver per receiving site antenna is sufficient.
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7

LO, Y. H., and T. P. LEE. "VERY HIGH SPEED OEIC TRANSMITTERS FOR FUTURE OPTICAL TRANSMISSION SYSTEMS AND OPTICAL NETWORKS." International Journal of High Speed Electronics and Systems 02, no. 01n02 (March 1991): 21–44. http://dx.doi.org/10.1142/s012915649100003x.

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The technology and system applications of high speed OEIC transmitters are discussed in this paper. With only two MOCVD growths and conventional processing techniques, OEIC transmitters made of sophisticated DFB laser diodes and InGaAs/InAlAs MODFETs can be fabricated. A speed of 10 Gbit/s has been demonstrated. Using the same technology, OEIC transmitters for high bit rate time division multiplexed (TDM) and dense wavelength division multiplexed (WDM) systems are designed and fabricated. There is evidence showing that the OEIC transmitter integrated with multiplexers and other critical circuits can offer significant cost reduction and performance improvement compared to hybrid approach. Using a four-channel OEIC WDM transmitter, we demonstrate its capability of precise wavelength control by setting the channel spacing as close as 0.3 nm. Finally, the crosstalk of OEIC is analyzed. Bonding wires are confirmed as the dominant factor for RF crosstalk. To keep the thermal crosstalk within an acceptable level, a proper device spacing to substrate thickness ratio has to be chosen.
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8

Salehkalaibar, Sadaf, and Michèle Wigger. "Distributed Hypothesis Testing over Noisy Broadcast Channels." Information 12, no. 7 (June 29, 2021): 268. http://dx.doi.org/10.3390/info12070268.

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This paper studies binary hypothesis testing with a single sensor that communicates with two decision centers over a memoryless broadcast channel. The main focus lies on the tradeoff between the two type-II error exponents achievable at the two decision centers. In our proposed scheme, we can partially mitigate this tradeoff when the transmitter has a probability larger than 1/2 to distinguish the alternate hypotheses at the decision centers, i.e., the hypotheses under which the decision centers wish to maximize their error exponents. In the cases where these hypotheses cannot be distinguished at the transmitter (because both decision centers have the same alternative hypothesis or because the transmitter’s observations have the same marginal distribution under both hypotheses), our scheme shows an important tradeoff between the two exponents. The results in this paper thus reinforce the previous conclusions drawn for a setup where communication is over a common noiseless link. Compared to such a noiseless scenario, here, however, we observe that even when the transmitter can distinguish the two hypotheses, a small exponent tradeoff can persist, simply because the noise in the channel prevents the transmitter to perfectly describe its guess of the hypothesis to the two decision centers.
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9

Morrison, Paul D., and Robin M. Murray. "The antipsychotic landscape: dopamine and beyond." Therapeutic Advances in Psychopharmacology 8, no. 4 (January 23, 2018): 127–35. http://dx.doi.org/10.1177/2045125317752915.

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Until recently, the actions of antipsychotic and pro-psychotic drugs have largely been evaluated in the framework of neuronal doctrine – namely, that neurons communicate by releasing transmitters, and that psychiatric disorders are caused by neurotransmitter imbalances. Moreover, the majority of studies have focused on single transmitter systems – neglecting the fact that in the nervous system, different transmitter systems work in concert and impact on not only their immediate receptors but also downstream pathways that shape structural plasticity. In this review, we discuss the history of understanding the antipsychotic and pro-psychotic actions of drugs, recent developments and future perspectives.
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10

Becker, Susanne, and Petra Schweinhardt. "Dysfunctional Neurotransmitter Systems in Fibromyalgia, Their Role in Central Stress Circuitry and Pharmacological Actions on These Systems." Pain Research and Treatment 2012 (October 2, 2012): 1–10. http://dx.doi.org/10.1155/2012/741746.

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Fibromyalgia is considered a stress-related disorder, and hypo- as well as hyperactive stress systems (sympathetic nervous system and hypothalamic-pituitary-adrenal axis) have been found. Some observations raise doubts on the view that alterations in these stress systems are solely responsible for fibromyalgia symptoms. Cumulative evidence points at dysfunctional transmitter systems that may underlie the major symptoms of the condition. In addition, all transmitter systems found to be altered in fibromyalgia influence the body's stress systems. Since both transmitter and stress systems change during chronic stress, it is conceivable that both systems change in parallel, interact, and contribute to the phenotype of fibromyalgia. As we outline in this paper, subgroups of patients might exhibit varying degrees and types of transmitter dysfunction, explaining differences in symptomatoloy and contributing to the heterogeneity of fibromyalgia. The finding that not all fibromyalgia patients respond to the same medications, targeting dysfunctional transmitter systems, further supports this hypothesis.
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Дисертації з теми "Transmitter systems"

1

Malkin, Moshe H. "Optimized transmitter-based signal processing for multicarrier systems /." May be available electronically:, 2009. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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2

Di, Rosa Gabriele. "Impact of Transmitter Distortion on Coherent Optical Systems." Thesis, KTH, Tillämpad fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240386.

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3

Chu, Min. "Phase-shifting techniques for wireless multiple-antenna transmitter applications /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/6002.

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4

Huang, Jinliang. "Adaptive MIMO Systems with Channel State Information at Transmitter." Doctoral thesis, KTH, Kommunikationssystem, CoS, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9777.

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This dissertation presents adaptation techniques that can achieve high spectral efficiency for single user multiple-input multiple-output (MIMO) systems. Two types of adaptation techniques, adaptive modulation and adaptive powe allocation, are employed to adapt the rate and the transmit power to fading channels. We start by investigating the adaptive modulation subject to a certain bit-error-ratio (BER) constraint, either instantaneous BER constraint or average BER constraint. The resulting average spectral efficiencies are obtained in closed-form expressions. It turns out that, by employing the average BER constraint, we can achieve the optimal average spectra efficiency at the cost of prohibitive computational complexity. On the other hand, instantaneous BER constraint leads to inferior performance with little computational complexity. In order to achieve comparable performance to the average BER constraint with limited complexity, a non-linear optimization method is proposed. To further enhance the average spectra efficiency, adaptive power allocation schemes are considered to adjust the transmit power across the temporal domain or the spatial domain, depending on the specific situation. Provided the closed-form expressions of the average spectral efficiency, the optimal MIMO coding scheme that offers the highest average spectral efficiency under the same circumstances can be identified. As we take into account the effect of imperfect channel estimation, the adaptation techniques are revised to tolerate interference introduced by the channel estimation errors. As a result, the degradation with respect to the average spectral efficiency is in proportion to signal-to-noise ratio (SNR). In order to facilitate fast development and verification of the adaptation schemes proposed for various MIMO systems, a reconfigurable Link Layer Simulator (LiLaS) which accommodates a variety of wireless/wireline applications is designed in the environment of MATLAB/OCTAVE. The idea of the simulator is originated from Software Defined Radio (SDR) and evolved to suit Cognitive Radio (CR) applications. For the convenience of modification and reconfiguration, LiLaS is functionally divided into generic blocks and all blocks are parameterized.
QC 20100812
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5

Mella, Evans Epafras. "Transmitter precoding and receiver processing for broadband wireless systems." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611880.

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6

Huang, Jin Liang. "Adaptive MIMO systems with channel state information at transmitter /." Stockholm : KTH Information and Communication Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9777.

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7

Eckler, Kyle. "Prototype MIMO Transmitter for Spin Stabilized Vehicles." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595804.

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ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada
This paper describes the design of an inexpensive and scalable transmitter for a Multiple-Input Multiple-Output (MIMO) communication system. The transmitter is intended to be used in aerospace applications, especially in spin stabilized vehicles. A field programmable gate array (FPGA) in the modulator will implement a modified Alamouti space time block code which will take advantage of the cyclostationary nature of the channel to increase the system data rate.
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8

Daempfling, Hauke C. "Design and implementation of the precision personnel locator digital transmitter system." Link to electronic thesis, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-122006-161049/.

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Анотація:
Thesis (M.S.)--Worcester Polytechnic Institute.
Keywords: precision personnel locator; digital systems; embedded systems; waveform generation; data communication. Includes bibliographical references (leaves 108-110).
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9

Lee, See Taur. "Quad-band global system for mobile communications complementary metal-oxide-semiconductor transmitter /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/6122.

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10

He, Jian. "Global Optimization of Transmitter Placement for Indoor Wireless Communication Systems." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/34817.

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The DIRECT (DIviding RECTangles) algorithm JONESJOTi, a variant of Lipschitzian methods for bound constrained global optimization, has been applied to the optimal transmitter placement for indoor wireless systems. Power coverage and BER (bit error rate) are considered as two criteria for optimizing locations of a specified number of transmitters across the feasible region of the design space. The performance of a DIRECT implementation in such applications depends on the characteristics of the objective function, the problem dimension, and the desired solution accuracy. Implementations with static data structures often fail in practice because of unpredictable memory requirements. This is especially critical in $S^4W$ (Site-Specific System Simulator for Wireless communication systems), where the DIRECT optimization is just one small component connected to a parallel 3D propagation ray tracing modeler running on a 200-node Beowulf cluster of Linux workstations, and surrogate functions for a WCDMA (wideband code division multiple access) simulator are also used to estimate the channel performance. Any component failure of this large computation would abort the entire design process. To make the DIRECT global optimization algorithm efficient and robust, a set of dynamic data structures is proposed here to balance the memory requirements with execution time, while simultaneously adapting to arbitrary problem size. The focus is on design issues of the dynamic data structures, related memory management strategies, and application issues of the DIRECT algorithm to the transmitter placement optimization for wireless communication systems. Results for two indoor systems are presented to demonstrate the effectiveness of the present work.
Master of Science
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Книги з теми "Transmitter systems"

1

Worrilow, Scott E. Ten-inch glass ball ARGOS transmitter using Seimac Ltd. platform terminal transmitter. [Woods Hole, Mass.]: Woods Hole Oceanographic Institution, 1996.

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2

Worrilow, Scott E. Ten-inch glass ball ARGOS transmitter using Seimac Ltd. platform terminal transmitter. [Woods Hole, Mass.]: Woods Hole Oceanographic Institution, 1996.

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3

Lin, Yuan-Pei. Filter bank transceivers for OFDM and DMT systems. Cambridge: Cambridge University Press, 2011.

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4

Grebennikov, Andrei. RF and microwave transmitter design. Hoboken, N.J: Wiley, 2011.

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5

Coppi, Elisabetta. Purines as transmitter molecules: Electrophysiological studies on purinergic signalling in different cell systems. Firenze: Firenze University Press, 2008.

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6

Vaidyanathan, P. P. Signal processing and optimization for transceiver systems. Cambridge, UK: Cambridge University Press, 2010.

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7

Friends of the Earth Cymru. Mobile phone base station transmitter masts: A briefing document = Mastiau trosglwyddo gorsaf ganolog ffonau symudol : dogfen gyfarwyddyd. Cardiff: Friends of the Earth Cymru, 2000.

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8

Pärssinen, Aarno. Direct conversion receivers in wide-band systems. Boston: Kluwer Academic Publishers, 2001.

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9

der, Tang Johan van, and Vaucher Cicero S, eds. Circuit design for RF transceivers. Boston: Kluwer Academic Publishers, 2001.

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10

1956-, Abidi Asad, Gray Paul R. 1942-, Meyer Robert G. 1942-, and IEEE Solid-State Circuits Society, eds. Integrated circuits for wireless communications. New York: IEEE Press, 1998.

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Частини книг з теми "Transmitter systems"

1

Barousis, Vlasis I. "Transmitter Techniques." In Parasitic Antenna Arrays for Wireless MIMO Systems, 85–117. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7999-4_4.

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de Arruda Mello, Darli Augusto, and Fabio Aparecido Barbosa. "The Optical Transmitter." In Digital Coherent Optical Systems, 19–46. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66541-8_2.

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Terenius, Lars. "Pain, Chemical Transmitter Concepts." In Sensory Systems: II, 78–80. Boston, MA: Birkhäuser Boston, 1988. http://dx.doi.org/10.1007/978-1-4684-6760-4_33.

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4

Saputra, Nitz, and John R. Long. "FM-UWB Transmitter." In FM-UWB Transceivers for Autonomous Wireless Systems, 49–68. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003338185-3.

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Fahim, Amr. "High-Linearity Wideband Transmitter." In Radio Frequency Integrated Circuit Design for Cognitive Radio Systems, 99–138. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-11011-0_5.

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Bloom, Floyd E., John Morrison, Elena Battenberg, David Lewis, and Michael Campbell. "Interactions between Convergent Afferent Transmitter Systems." In Receptor-Receptor Interactions, 3–12. London: Palgrave Macmillan UK, 1987. http://dx.doi.org/10.1007/978-1-349-08949-9_1.

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Bloom, Floyd E., John Morrison, Elena Battenberg, David Lewis, and Michael Campbell. "Interactions between Convergent Afferent Transmitter Systems." In Receptor-Receptor Interactions, 3–12. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-5415-4_1.

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Arbuthnott, G. "Methods in the Mapping of Neurotransmitter Systems in the Brain." In Transmitter Molecules in the Brain, 27–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-69950-4_4.

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Majidzadeh Bafar, Vahid, and Alexandre Schmid. "Digital Impulse Radio Ultra Wide-Band Transmitter." In Wireless Cortical Implantable Systems, 131–77. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6702-1_6.

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Maurya, Praveen, S. F. Ali, and N. Mandal. "A Smart Flow Transmitter Using Ultrasonic Sensors." In Algorithms for Intelligent Systems, 131–37. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3368-3_13.

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Тези доповідей конференцій з теми "Transmitter systems"

1

Elkhenissi, Kamel, Maxim Cournoyer, Dominic Deslandes, and Frederic Nabki. "A transmitted-reference low-power reconfigurable ultra-wideband transmitter." In 2010 IEEE International Symposium on Circuits and Systems - ISCAS 2010. IEEE, 2010. http://dx.doi.org/10.1109/iscas.2010.5537797.

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Saadati, Marjan, and Jill K. Nelson. "Multiple transmitter localization using clustering by likelihood of transmitter proximity." In 2017 51st Asilomar Conference on Signals, Systems, and Computers. IEEE, 2017. http://dx.doi.org/10.1109/acssc.2017.8335665.

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3

Ghasempour, Mohsen, Delong Shang, Fei Xia, and Alex Yakovlev. "Ultra-low power transmitter." In 2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012. IEEE, 2012. http://dx.doi.org/10.1109/iscas.2012.6271617.

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Hu, Xiaoling, Caijun Zhong, Yongxu Zhu, Xiaoming Chen, and Zhaoyang Zhang. "Programmable Metasurface Transmitter Aided Multicast Systems." In 2020 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2020. http://dx.doi.org/10.1109/wcnc45663.2020.9120515.

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5

Zhang, Hua, Matt Pearson, Serge Bidnyk, and Ashok Balakrishnan. "Hybrid Transmitter Cells for DWDM Systems." In Integrated Photonics Research, Silicon and Nanophotonics. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/iprsn.2011.iwc6.

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6

Meljanets, G. I., and V. S. Berdjaev. "SSB-SC transmitter exciter." In 2018 Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO). IEEE, 2018. http://dx.doi.org/10.1109/synchroinfo.2018.8457046.

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7

Matsuura, Kodai, Masataka Ishihara, Akihiro Konishi, Kazuhiro Umetani, and Eiji Hiraki. "Multiple-Transmitter Achieving Load-Independent Transmitter Current and Compensation of Cross-Interference Among Transmitters for Wide Charging Area Wireless Power Transfer Systems." In 2020 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2020. http://dx.doi.org/10.1109/ecce44975.2020.9235430.

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Preussler, Stefan, Arijit Misra, Karanveer Singh, Janosch Meier, and Thomas Schneider. "Simplified 3 channel PAM4 Nyquist TDM transmitter." In Next-Generation Optical Communication: Components, Sub-Systems, and Systems X, edited by Guifang Li and Kazuhide Nakajima. SPIE, 2021. http://dx.doi.org/10.1117/12.2576876.

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Gupta, Nitin, Tapas Nandy, Paramjeet Singh Sahni, Manish Garg, and Jai Narayan Tripathi. "Zero power 4.95Gbps HDMI transmitter." In 2014 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2014. http://dx.doi.org/10.1109/iscas.2014.6865431.

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Ock, Sungmin, Jaegan Ko, and Ranjit Gharpurey. "A Cartesian Feedback Feedforward Transmitter." In 2011 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2011. http://dx.doi.org/10.1109/iscas.2011.5937538.

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Звіти організацій з теми "Transmitter systems"

1

Carlson, Thomas J., and Mitchell J. Myjak. Juvenile Salmon Acoustic Telemetry System Transmitter Downsize Assessment. Office of Scientific and Technical Information (OSTI), April 2010. http://dx.doi.org/10.2172/981570.

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2

Serges, T. J. D-Zero Instrument Air System Humidity Transmitter Evaluation. Office of Scientific and Technical Information (OSTI), July 1988. http://dx.doi.org/10.2172/1031183.

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3

George, David C., and D. D. Snyder. An EM System with Dynamic Multi-Axis Transmitter and Tensor Gradiometer Receiver. Fort Belvoir, VA: Defense Technical Information Center, June 2011. http://dx.doi.org/10.21236/ada579062.

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4

Cale, R., T. Clark, R. Dixson, and D. Hagemeyer. Radiation Exposure Monitoring and Information Transmittal (REMIT) system. User`s manual. Office of Scientific and Technical Information (OSTI), June 1993. http://dx.doi.org/10.2172/10173377.

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5

Wilson, D., Daniel Breton, Lauren Waldrop, Danney Glaser, Ross Alter, Carl Hart, Wesley Barnes, et al. Signal propagation modeling in complex, three-dimensional environments. Engineer Research and Development Center (U.S.), April 2021. http://dx.doi.org/10.21079/11681/40321.

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The Signal Physics Representation in Uncertain and Complex Environments (SPRUCE) work unit, part of the U.S. Army Engineer Research and Development Center (ERDC) Army Terrestrial-Environmental Modeling and Intelligence System (ARTEMIS) work package, focused on the creation of a suite of three-dimensional (3D) signal and sensor performance modeling capabilities that realistically capture propagation physics in urban, mountainous, forested, and other complex terrain environments. This report describes many of the developed technical capabilities. Particular highlights are (1) creation of a Java environmental data abstraction layer for 3D representation of the atmosphere and inhomogeneous terrain that ingests data from many common weather forecast models and terrain data formats, (2) extensions to the Environmental Awareness for Sensor and Emitter Employment (EASEE) software to enable 3D signal propagation modeling, (3) modeling of transmitter and receiver directivity functions in 3D including rotations of the transmitter and receiver platforms, (4) an Extensible Markup Language/JavaScript Object Notation (XML/JSON) interface to facilitate deployment of web services, (5) signal feature definitions and other support for infrasound modeling and for radio-frequency (RF) modeling in the very high frequency (VHF), ultra-high frequency (UHF), and super-high frequency (SHF) frequency ranges, and (6) probabilistic calculations for line-of-sight in complex terrain and vegetation.
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6

DiJoseph, Patricia, Brian Tetreault, and Marin Kress. AIS data case Study : identifying AIS coverage gaps on the Ohio River in CY2018. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40886.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) describes a method for evaluating the received coverage from Automatic Identification System (AIS) shore sites and the availability of historic vessel position reports along the Ohio River. The network of AIS shoreside sites installed and operated by the US Army Corps of Engineers (USACE) and the US Coast Guard (USCG) receive information transmitted from vessels; however, reception of these transmissions is generally line-of-sight between the vessel and the AIS site antenna. Reception may also be affected by factors such as the quality of the transceiver installation aboard the vessel as well as the state of the equipment at the receiving site. Understanding how to define and quantify coverage gaps along the inland river system can inform research utilizing AIS data, provide information on the performance of the AIS network, and provide guidance for efforts to address identified coverage gaps
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Tetreault, Brian, Marin Kress, and Patricia DiJoseph. AIS data case study : evaluating reception of AIS position reports on the Missouri River by LOMA AIS sites in April and August 2020. Engineer Research and Development Center (U.S.), January 2022. http://dx.doi.org/10.21079/11681/42980.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) describes a method for evaluating the received coverage from Automatic Identification System (AIS) shoreside sites along the Missouri River managed by the US Army Corps of Engineers (USACE) Lock Operations Management Application (LOMA), and presents the results of that analysis. The purpose is to identify AIS coverage gaps in the current system. Reception of AIS transmissions between shore-based transceivers and vessels is generally line-of-sight between the vessel and the AIS site antenna. However, signal reception may be affected by factors such as the distance and terrain between the vessel and the transceiver site, quality of the transceiver installation, state of the equipment either aboard the vessel or at the shore transceiver station, and atmospheric phenomena. Quantifying coverage gaps along the inland waterways system can inform research that uses AIS data, provide information on the performance of the AIS network, and provide guidance for efforts to address coverage gaps to improve navigation safety. In autumn 2020, severe shoaling was occurring on the Missouri River. As the shoals were identified, the Kansas City District requested the LOMA system transmit AIS Aid to Navigation (AtoN) to mark the shoals in several critical areas. However, vessel pilots sometimes reported that they were not receiving the AIS AtoN being transmitted. At the request of the Kansas City District, the US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory (ERDC-CHL), conducted a coverage analysis using data collected from the LOMA AIS transceivers in the area to determine if there were coverage issues and their extent and to aid in determining the best means of addressing any coverage gaps.
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Ullman, Diane, James Moyer, Benjamin Raccah, Abed Gera, Meir Klein, and Jacob Cohen. Tospoviruses Infecting Bulb Crops: Evolution, Diversity, Vector Specificity and Control. United States Department of Agriculture, September 2002. http://dx.doi.org/10.32747/2002.7695847.bard.

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Objectives. The overall goal of the proposed research was to develop a mechanistic understanding of tospovirus evolution, diversity and vector specificity that could be applied to development of novel methods for limiting virus establishment and spread. Our specific objectives were: 1) To characterize newly intercepted tospoviruses in onion, Hippeastrum and other bulb crops and compare them with the known tomato spotted wilt virus (TSWV) and its isolates; 2) To characterize intra- and interspecific variation in the virus transmission by thrips of the new and distinct tospoviruses. and, 3) To determine the basis of vector specificity using biological, cellular and molecular approaches. Background. New tospoviruses infecting bulb crops were detected in Israel and the US in the mid-90s. Their plant host ranges and relationships with thrips vectors showed they differed from the type member of the Tospovirus genus, tomato spotted wilt virus (TSWV). Outbreaks of these new viruses caused serious crop losses in both countries, and in agricultural and ornamental crops elsewhere. In the realm of plant infecting viruses, the tospoviruses (genus: Tospovirus , family: Bunyaviridae ) are among the most aggressive emerging viruses. Tospoviruses are transmitted by several species of thrips in a persistent, propagative fashion and the relationships between the viruses and their thrips vectors are often specific. With the emergence of new tospoviruses, new thrips vector/tospovirus relationships have also arisen and vector specificities have changed. There is known specificity between thrips vector species and particular tospoviruses, although the cellular and molecular bases for this specificity have been elusive. Major conclusions, solutions and achievements. We demonstrated that a new tospovirus, iris yellow spot virus (IYSV) caused "straw bleaching" in onion (Allium cepa) and lisianthus necrosis in lisianthus (Eustoma russellianum). Characterization of virus isolates revealed genetic diversity among US, Brazilian, Dutch and Israeli isolates. IYSV was not seed transmitted, and in Israel, was not located in bulbs of infected plants. In the US, infected plants were generated from infected bulbs. The relationship between IYSV and Thrips tabaci was shown to be specific. Frankliniella occidentalis, the primary vector of many other tospoviruses, did not transmit IYSV isolates in Israel or the US. Furthermore, 1': tabaci populations varied in their transmission ability. Transmission was correlated to IYSV presence in thrips salivary glands. In Israel, surveys in onion fields revealed that the onion thrips, Thrips tabaci Lindeman was the predominant species and that its incidence was strongly related to that of IYSV infection. In contrast, in the U.S., T. tabaci and F. occidentalis were present in high numbers during the times sampled. In Israel, insecticides reduced onion thrips population and caused a significant yield increase. In the US, a genetic marker system that differentiates non-thrips transmissible isolates from thrips transmissible isolate demonstrated the importance of the M RNA to thrips transmission of tospoviruses. In addition, a symbiotic Erwinia was discovered in thrips and was shown to cause significant artifacts in certain types of virus binding experiments. Implications, scientific and agricultural. Rapid emergence of distinct tospoviruses and new vector relationships is profoundly important to global agriculture. We advanced the understanding of IYSV in bulb crops and its relationships with thrips vector species. The knowledge gained provided growers with new strategies for control and new tools for studying the importance of particular viral proteins in thrips specificity and transmission efficiency.
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Davidson, Irit, Hsing-Jien Kung, and Richard L. Witter. Molecular Interactions between Herpes and Retroviruses in Dually Infected Chickens and Turkeys. United States Department of Agriculture, January 2002. http://dx.doi.org/10.32747/2002.7575275.bard.

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Tumors in commercial poultry are caused mainly by infection with avian herpes and retroviruses, the herpesvirus Marek's disease virus (MDV) and the retroviruses, reticuloendotheliosis (REV), lymphoid leukosis, subgroups A-I and J (ALV and ALV-J) in chickens, or Iymphoprolipherative disease (LPDV) in turkeys. Infection with one virus aggravates the clinical outcome of birds that are already infected by another oncogenic virus. As these viruses do not interfere for infection, MDV and one or more retroviruses can infect the same flock, the same bird and the same cell. While infecting the same cell, herpes and retroviruses might interact in at least three ways: a) Integration of retrovirus genomes, or genomic fragments (mainly the LTR) into MDV;b) alteration of LTR-driven expression of retroviral genes by MDV immediate- early genes, and c) by herpesvirus induced cellular transcriptional factors. The first type of molecular interaction have been demonstrated to happen efficiently in vitro by Dr. Kung, in cases multiple infection of cell cultures with MDV and REV or MDV and ALV. Moreover, Dr. Witter showed that an in vitro-created recombinant, RM1, had altered in vitro replication and in vivo biological properties. A more comprehensive characterization of RM1 was carried out in the present project. We sought to highlight whether events of such integrations occur also in the bird, in vivo. For that, we had first to determine the prevalence of dually-infected individual birds in commercial flocks, as no systematic survey has been yet reported. Surprisingly, about 25% of the commercial flocks infected with avian oncogenic viruses had a multiple virus infection and 5% of the total samples ana lysed had multiple virus sequences. Then, we aimed to evaluate and characterize biologically and molecularly the resulting recombinants, if formed, and to analyse the factors that affect these events (virus strains, type and age of birds and time interval between the infection with both viruses). The perception of retrovirus insertions into herpesviruses in vivo is not banal, as the in vivo and in vitro systems differ in the viral-target cells, lymphocytes or fibroblasts, in the MDV-replicative type, transforming or productive, and the immune system presence. We realized that previous methods employed to study in vitro created recombinant viruses were not adequate for the study of samples taken directly from the bird. Therefore, the Hot Spot-combined PCR was developed based on the molecularly known RM1 virus. Also, the PFGE that was used for tissue cultured-MDV separation was inefficient for separating MDV from organs, but useful with feather tips as a source of bird original MDV. Much attention was dedicated now to feathers, because if a recombinant virus would be formed in vivo, its biological significance would be evident by horizontal dissemination through the feathers. Major findings were: a) not only in vitro, but also in vivo MDV and retrovirus co-infections lead to LTR integrations into MDV. That was shown by the detection of chimeric molecules. These appeared in low quantities and as quasispecies, thus interfering with sequence analysis of cloned gel-purified chimeric molecules. Mainly inserts were located in the repeat long MDV fragments. In field birds chimeric molecules were detected at a lower frequency (2.5%) than in experimentally infected birds (30-50%). These could be transmitted experimentally to another birds by inoculation with chimeric molecules containing blood. Several types of chimeric molecules were formed, and same types were detected in birds infected by a second round. To reproduce viral integrations, in vivo infection trials were done with field inoculate that contained both viruses, but the chimeric molecule yield was undetectable.
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10

Hunter, Martha S., and Einat Zchori-Fein. Rickettsia in the whitefly Bemisia tabaci: Phenotypic variants and fitness effects. United States Department of Agriculture, September 2014. http://dx.doi.org/10.32747/2014.7594394.bard.

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The sweet potato whitefly, Bemisia tabaci (Hemiptera: Aleyrodidae) is a major pest of vegetables, field crops, and ornamentals worldwide. This species harbors a diverse assembly of facultative, “secondary” bacterial symbionts, the roles of which are largely unknown. We documented a spectacular sweep of one of these, Rickettsia, in the Southwestern United States in the B biotype (=MEAM1) of B. tabaci, from 1% to 97% over 6 years, as well as a dramatic fitness benefit associated with it in Arizona but not in Israel. Because it is critical to understand the circumstances in which a symbiont invasion can cause such a large change in pest life history, the following objectives were set: 1) Determine the frequency of Rickettsia in B. tabaci in cotton across the United States and Israel. 2) Characterize Rickettsia and B. tabaci genotypes in order to test the hypothesis that genetic variation in either partner is responsible for differences in phenotypes seen in the two countries. 3) Determine the comparative fitness effects of Rickettsia phenotypes in B. tabaci in Israel and the United States. For Obj. 1, a survey of B. tabaci B samples revealed the distribution of Rickettsia across the cotton-growing regions of 13 sites from Israel and 22 sites from the USA. Across the USA, Rickettsia frequencies were heterogeneous among regions, but were generally at frequencies higher than 75% and close to fixation in some areas, whereas in Israel the infection rates were lower and declining. The distinct outcomes of Rickettsia infection in these two countries conform to previouslyreported phenotypic differences. Intermediate frequencies in some areas in both countries may indicate a cost to infection in certain environments or that the frequencies are in flux. This suggests underlying geographic differences in the interactions between bacterial symbionts and the pest. Obj. 2, Sequences of several Rickettsia genes in both locations, including a hypervariableintergenic spacer gene, suggested that the Rickettsia genotype is identical in both countries. Experiments in the US showed that differences in whitefly nuclear genotype had a strong influence on Rickettsia phenotype. Obj. 3. Experiments designed to test for possible horizontal transmission of Rickettsia, showed that these bacteria are transferred from B. tabaci to a plant, moved inside the phloem, and could be acquired by other whiteflies. Plants can serve as a reservoir for horizontal transmission of Rickettsia, a mechanism that may explain the occurrence of phylogenetically-similarsymbionts among unrelated phytophagous insect species. This plant-mediated transmission route may also exist in other insect-symbiont systems, and since symbionts may play a critical role in the ecology and evolution of their hosts, serve as an immediate and powerful tool for accelerated evolution. However, no such horizontal transmission of Rickettsia could be detected in the USA, underlining the difference between the interaction in both countries, or between B. tabaci and the banded wing whitefly on cotton in the USA (Trialeurodes sp. nr. abutiloneus) and the omnivorous bug Nesidiocoristenuis. Additionally, a series of experiments excluded the possibility that Rickettsia is frequently transmitted between B. tabaci and its parasitoid wasps Eretmocerusmundus and Encarsiapergandiella. Lastly, ecological studies on Rickettsia effects on free flight of whiteflies showed no significant influence of symbiont infection on flight. In contrast, a field study of the effects of Rickettsia on whitefly performance on caged cotton in the USA showed strong fitness benefits of infection, and rapid increases in Rickettsia frequency in competition population cages. This result confirmed the benefits to whiteflies of Rickettsia infection in a field setting.
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