Journal articles: '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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

11

Wang, Xing-Yuan, and Hao Zhang. "A Robust Secondary Secure Communication Scheme Based on Synchronization of Spatiotemporal Chaotic Systems." Zeitschrift für Naturforschung A 68, no. 8-9 (September 1, 2013): 573–80. http://dx.doi.org/10.5560/zna.2013-0046.

Full text

Abstract:

This paper deals with the synchronization of spatiotemporal chaotic systems and presents a new robust secondary chaotic secure communication system for digital signal transmissions which can recover digital signal even though the transmitted signal is influenced by limited noise. The transmitter terminal and the receiver terminal both contain a spatiotemporal chaotic system and a hyperchaotic system. The asymptotic convergence of the errors between the states of the transmitter terminal and the receiver terminal has been proved based on the Lyapunov stable theory and active-passive decomposition (APD) method. Moreover, a random digital signal and a binary Lena image are encrypted and decrypted successfully to verify the efficiency of the proposed robust secure communication system.

APA, Harvard, Vancouver, ISO, and other styles

12

Ravi Sankar, M., and Dr K. V. Satyanarayana. "Ergodic sum rate of transmitting antenna selection in non-orthogonal multiple access for modern systems." International Journal of Engineering & Technology 7, no. 3.29 (August 24, 2018): 61. http://dx.doi.org/10.14419/ijet.v7i3.29.18462.

Full text

Abstract:

Wireless systems hiring multiple antennas at the transmitter side used for the transmission of the high capacity information through the channels making the system more complex and costlier. To overcome these problems, the multiple antennas at the transmitter side must be reduced and the performance should retained with reduced antennas as earlier. This can be achieved by using the algorithm Transmitting Antenna Selection (TAS) which is carried out by considering the transmission of the information through the channels using the Non-Orthogonal Multiple Access (NOMA). The NOMA algorithm is used to provide the high throughput using the heterogeneous demands in which there is no interference between the transmitted signals from the multiple antennas equipped in a single base station. TAS-NOMA algorithm is proposed in this paper for selecting the best transmitting antenna out of multiple antennas equipped in the base station by using the Ergodic sum rate which is measured at the transmitter side considering the average of the channels capacity.

APA, Harvard, Vancouver, ISO, and other styles

13

Thorstad, Eva B., Sven E. Kerwath, Colin G. Attwood, Finn Økland, Christopher G. Wilke, Paul D. Cowley, and Tor F. Næsje. "Long-term effects of two sizes of surgically implanted acoustic transmitters on a predatory marine fish (Pomatomus saltatrix)." Marine and Freshwater Research 60, no. 2 (2009): 183. http://dx.doi.org/10.1071/mf08191.

Full text

Abstract:

Fish telemetry is increasingly used to study fish behaviour in marine systems and it is crucial that the tagging does not affect fish behaviour and welfare negatively. Hence, the long-term effects of surgically implanted acoustic telemetry transmitters on survival, tag retention, healing and growth on Pomatomus saltatrix (known as tailor in Australia, elf in South Africa and bluefish in North America) were studied over 144 days. P. saltatrix are well suited for transmitter implants because no tagging-related short- or long-term mortality or transmitter expulsion was recorded. Small transmitters (9 × 28 mm, 3.3 g in water) did not affect the specific growth rate of tagged fish compared with an untagged control group. In contrast, the fish tagged with large transmitters (13 × 50 mm, 6.9 g in water) had a reduced specific growth rate. The small, but not the large transmitter, seemed suitable for tagging P. saltatrix of the body sizes represented in this study (215–621 g). The specific growth rate was negatively affected by increasing the transmitter-mass-in-water to body-mass ratio. It is recommended that this ratio should not exceed 1.4%.

APA, Harvard, Vancouver, ISO, and other styles

14

Kim, Won-Chang, Min-Jae Paek, and Hyoung-Kyu Song. "Relay Selection Scheme for Multi-Hop Transmission of MU-MIMO System." Applied Sciences 8, no. 10 (September 27, 2018): 1747. http://dx.doi.org/10.3390/app8101747.

Full text

Abstract:

Recently, wireless communication systems use a multi-hop transmission scheme using a relay to expand the cell coverage of the system. The multi-hop transmission scheme can expand the cell coverage of wireless communication systems. However, if an appropriate relay is not selected, errors generated during signal processing in the relay are transmitted to the receiver. Therefore, a relay selection scheme is essential for reliable multi-hop transmission. This paper proposes a relay selection scheme for reliable multi-hop transmission in a multi user-multiple input multiple output (MU-MIMO) system. The proposed relay selection scheme uses a MIMO channel matrix between the transmitter and relays to select an appropriate relay. The proposed relay selection scheme obtains the singular values of the MIMO channel matrix using the singular value decomposition (SVD). Then, the sum of the singular values is calculated, and the relay having the largest value is selected. Therefore, in the proposed relay selection scheme, although the transmitter only knows the channel information between the transmitter and relays, the transmitter can select an appropriate relay for reliable multi-hop transmission.

APA, Harvard, Vancouver, ISO, and other styles

15

Hartmann, J., G. Künig, and P. Riederer. "Involvement of transmitter systems in neuropsychiatric diseases." Acta Neurologica Scandinavica 87, S146 (May 1993): 18–21. http://dx.doi.org/10.1111/j.1600-0404.1993.tb00015.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

PERSSON, SVEN-ÅKE, GUDRUN CASSEL, and ÅKE SELLSTRÖM. "Acute Cyanide Intoxication and Central Transmitter Systems." Toxicological Sciences 5, no. 6part2 (1985): 150–59. http://dx.doi.org/10.1093/toxsci/5.6part2.150.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Rainbolt, B. J., and S. L. Miller. "CDMA transmitter filtering for cellular overlay systems." IEEE Transactions on Communications 48, no. 2 (2000): 290–97. http://dx.doi.org/10.1109/26.823562.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

PERSSON, S. "Acute cyanide intoxication and central transmitter systems." Fundamental and Applied Toxicology 5, no. 6 (December 1985): S150—S159. http://dx.doi.org/10.1016/0272-0590(85)90124-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Dooghabadi, Malihe Zarre, Hakon A. Hjortland, Oivind Nass, Kin Keung Lee, and Tor Sverre Lande. "An IR-UWB Transmitter for Ranging Systems." IEEE Transactions on Circuits and Systems II: Express Briefs 60, no. 11 (November 2013): 721–25. http://dx.doi.org/10.1109/tcsii.2013.2281909.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Abuelma'atti, M. T., and I. S. Qamber. "Prediction of reliability of broadcasting transmitter systems." IEEE Transactions on Broadcasting 43, no. 3 (1997): 237–41. http://dx.doi.org/10.1109/11.632895.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Wong, T. F., and T. M. Lok. "Transmitter adaptation in multicode DS-CDMA systems." IEEE Journal on Selected Areas in Communications 19, no. 1 (2001): 69–82. http://dx.doi.org/10.1109/49.909610.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Cheng, Hesheng, and Huakun Zhang. "Investigation of Improved Methods in Power Transfer Efficiency for Radiating Near-Field Wireless Power Transfer." Journal of Electrical and Computer Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/2136923.

Full text

Abstract:

A metamaterial-inspired efficient electrically small antenna is proposed, firstly. And then several improving power transfer efficiency (PTE) methods for wireless power transfer (WPT) systems composed of the proposed antenna in the radiating near-field region are investigated. Method one is using a proposed antenna as a power retriever. This WPT system consisted of three proposed antennas: a transmitter, a receiver, and a retriever. The system is fed by only one power source. At a fixed distance from receiver to transmitter, the distance between the transmitter and the retriever is turned to maximize power transfer from the transmitter to the receiver. Method two is using two proposed antennas as transmitters and one antenna as receiver. The receiver is placed between the two transmitters. In this system, two power sources are used to feed the two transmitters, respectively. By adjusting the phase difference between the two feeding sources, the maximum PTE can be obtained at the optimal phase difference. Using the same configuration as method two, method three, where the maximum PTE can be increased by regulating the voltage (or power) ratio of the two feeding sources, is proposed. In addition, we combine the proposed methods to construct another two schemes, which improve the PTE at different extent than classical WPT system.

APA, Harvard, Vancouver, ISO, and other styles

23

Lee, Joungha, and Seung Beop Lee. "Transmitter Module Optimization for Wireless Power Transfer Systems with Single Transmitter to Multiple Receivers." Mathematics 9, no. 22 (November 17, 2021): 2928. http://dx.doi.org/10.3390/math9222928.

Full text

Abstract:

Most of the coil designs for wireless power transfer (WPT) systems have been developed based on the “single transmitter to a single receiver (S-S)” WPT systems by the empirical design approaches, partial domain searches, and shape optimization methods. Recently, the layout optimizations of the receiver coil for S-S WPT systems have been developed using gradient-based optimization, fixed-grid (FG) representation, and smooth boundary (SB) representation. In this paper, the new design optimization of the transmitter module for the “single transmitter to multiple receivers (S-M)” WPT system with the resonance optimization for the S-M WPT system is proposed to extremize the total power transfer efficiency while satisfying the load voltage (i.e., rated power) required by each receiver and the total mass used for the transmitter coil. The proposed method was applied to an application model (e.g., S-M WPT systems with two receiver modules). Using the sensitivity of design variables with respect to the objective function (i.e., total power transfer efficiency) and constraint functions (i.e., load voltage of each receiver module and transmitter coil mass) at each iteration of the optimization process, the proposed method determines the optimal transmitter module that can maximize the total power transfer efficiency while several constraints are satisfied. Finally, the optimized transmitter module for the S-M WPT system was demonstrated through comparison with experiments under the same conditions as the simulation environment.

APA, Harvard, Vancouver, ISO, and other styles

24

Alshammari, A. S. "Synchronization of Two Chaotic Stream Ciphers in Secure CDMA Communication Systems." Engineering, Technology & Applied Science Research 10, no. 4 (August 16, 2020): 5947–52. http://dx.doi.org/10.48084/etasr.3569.

Full text

Abstract:

In the basic processing of Code Division Multiple Access (CDMA) systems using chaotic code sequences, a pair of chaos generators in the transmitter and the receiver are used to generate the same sequence, in order to synchronize and retrieve the transmitted signals. In addition, a filter with a simple structure should be integrated into chaotic signals to achieve the maximum of the signal to noise ratio and mitigate the harmful effects of multipath. Another effective property of chaos signal is that a wireless multipath channel does not change the amount of contained information. Considering those issues, the present paper describes a practical system for synchronizing two chaotic generators used in a digital CDMA. Chaotic generators were used to spread the data and provide security against attack. Both receiver and transmitter were implemented using two separate Spartan 6 FPGA boards. Experimental results proved the robustness of the proposed method which could contribute towards the synchronization of chaotic signals in secure CDMA communication systems.

APA, Harvard, Vancouver, ISO, and other styles

25

Sang, Pil Gyu, Deblina Biswas, Seung Jin Lee, Sang Min Won, Donghee Son, Jong G. Ok, Hui Joon Park, and Hyoung Won Baac. "Experimental Demonstration of a Stacked Hybrid Optoacoustic-Piezoelectric Transducer for Localized Heating and Enhanced Cavitation." Micromachines 12, no. 10 (October 18, 2021): 1268. http://dx.doi.org/10.3390/mi12101268.

Full text

Abstract:

Laser-generated focused ultrasound (LGFU) is an emerging modality for cavitation-based therapy. However, focal pressure amplitudes by LGFU alone to achieve pulsed cavitation are often lacking as a treatment depth increases. This requires a higher pressure from a transmitter surface and more laser energies that even approach to a damage threshold of transmitter. To mitigate the requirement for LGFU-induced cavitation, we propose LGFU configurations with a locally heated focal zone using an additional high-intensity focused ultrasound (HIFU) transmitter. After confirming heat-induced cavitation enhancement using two separate transmitters, we then developed a stacked hybrid optoacoustic-piezoelectric transmitter, which is a unique configuration made by coating an optoacoustic layer directly onto a piezoelectric substrate. This shared curvature design has great practical advantage without requiring the complex alignment of two focal zones. Moreover, this enabled the amplification of cavitation bubble density by 18.5-fold compared to the LGFU operation alone. Finally, the feasibility of tissue fragmentation was confirmed through a tissue-mimicking gel, using the combination of LGFU and HIFU (not via a stacked structure). We expect that the stacked transmitter can be effectively used for stronger and faster tissue fragmentation than the LGFU transmitter alone.

APA, Harvard, Vancouver, ISO, and other styles

26

AL-Rawi, Muhanned. "Study of the tracking of FHSS signal over AWGN channel." International Review of Applied Sciences and Engineering 11, no. 1 (April 2020): 4–14. http://dx.doi.org/10.1556/1848.2020.00002.

Full text

Abstract:

AbstractFrequency Hopping Spread Spectrum (FHSS) communications utilizes a pseudo random code to spread the bandwidth of the data being transmitted over a much wider range than is required by the data. Due to the pseudo random nature of the carriers selected for transmission, the spreading and dispreading process must occur simultaneously to recover the transmitted data signal. This requires the receiver have knowledge about the instant the transmitter began transmitting and the propagation delay between the two. However, in real world systems, this information is unavailable to the receiver. The paper utilizes MATLAB Simulink to demonstrate a method of synchronizing the code clock at the receiver with the code clock at the transmitter. This fine alignment process is known as code tracking.

APA, Harvard, Vancouver, ISO, and other styles

27

DJEMAÏ, M., J. P. BARBOT, and D. BOUTAT. "NEW TYPE OF DATA TRANSMISSION USING A SYNCHRONIZATION OF CHAOTIC SYSTEMS." International Journal of Bifurcation and Chaos 15, no. 01 (January 2005): 207–23. http://dx.doi.org/10.1142/s0218127405012119.

Full text

Abstract:

In this article, the secure transmission of data is being realized on the basis of the synchronization of two chaotic systems. The transmitted signal is only the sign of a projection of the state. This has the advantage of making the transmission not very sensitive to the noises of transmission and the attenuation of the transmitted signal without using a VCO (Voltage Control Oscillatory) into the transmitter and the receiver. It should be noted that for the considered type of chaotic system, the traditional conditions of observability and linearization by injection of outputs are not checked. Here, we can only carry out an estimator.

APA, Harvard, Vancouver, ISO, and other styles

28

Eisencraft, Marcio, Renato D. Fanganiello, and Luiz A. Baccala. "Synchronization of Discrete-Time Chaotic Systems in Bandlimited Channels." Mathematical Problems in Engineering 2009 (2009): 1–12. http://dx.doi.org/10.1155/2009/207971.

Full text

Abstract:

Over the last couple of decades, many methods for synchronizing chaotic systems have been proposed with communications applications in view. Yet their performance has proved disappointing in face of the nonideal character of usual channels linking transmitter and receiver, that is, due to both noise and signal propagation distortion. Here we consider a discrete-time master-slave system that synchronizes despite channel bandwidth limitations and an allied communication system. Synchronization is achieved introducing a digital filter that limits the spectral content of the feedback loop responsible for producing the transmitted signal.

APA, Harvard, Vancouver, ISO, and other styles

29

Kabbara, Wassim, Mohamed Bensetti, Tanguy Phulpin, Antoine Caillierez, Serge Loudot, and Daniel Sadarnac. "A Control Strategy to Avoid Drop and Inrush Currents during Transient Phases in a Multi-Transmitters DIPT System." Energies 15, no. 8 (April 15, 2022): 2911. http://dx.doi.org/10.3390/en15082911.

Full text

Abstract:

Electrical Vehicles (EVs) have gained popularity in recent years in the automotive field. They are seen as a way to reduce the CO2 footprint of vehicles. Although EVs have witnessed significant advancement in recent years, they still have two major setbacks: limited autonomy and long recharging time. Dynamic Inductive Power Transfer (DIPT) systems permit charging EVs while driving, provide unlimited autonomy, and eliminate stationary charging time and lower battery dependency. Multiple transmitters are required to achieve DIPT; thus, dealing with transient phases is essential because every time a receiver crosses over from one transmitter to another, it experiences a new transient phase. This article presents a novel control strategy for multi-transmitter DIPT systems that ensures a continuous and stable power transfer to a moving EV. The proposed control strategy eliminates drop and inrush currents during transient phases. The control integrates a soft start feature and a degraded operating mode at a predefined maximum current value. The studied structure is a symmetrical series–series compensation network. Each transmitter coil is driven by a variable frequency inverter (around 85 kHz) to ensure Zero Phase Angle mode. The control strategy was numerically validated using MATLAB Simulink and then tested experimentally. Results show a relatively low power disruption after applying the proposed control during transmitter sequencing.

APA, Harvard, Vancouver, ISO, and other styles

30

Kalis, H. U. "Pulsation Control in Pressure Metering Systems." Journal of Low Frequency Noise, Vibration and Active Control 13, no. 1 (March 1994): 19–29. http://dx.doi.org/10.1177/026309239401300104.

Full text

Abstract:

Reliable pressure measurement in pulsating flow conditions is difficult. When an orifice meter is used, two significant errors can arise: the square root error, which is inherent to orifice plates, and the pressure distortion generated in the sensing lines and DP transmitter. This study is concerned with minimizing pulsation effects in the sensing-recording system. The method used involves predicting the system dynamic characteristic and modifying it so that pulsation excitation frequencies and the resonant frequencies of the system do not coincide. A differential pressure metering system is modelled as a acoustic-mechanical assembly that includes a DP transmitter equivalent piston, its cavities and sensing lines. The acoustic-mechanical interaction is shown for the pressure metering system incorporating a bellows type DP transmitter. The influence of the acoustic and mechanical parameters on the system dynamic characteristic is discussed.

APA, Harvard, Vancouver, ISO, and other styles

31

G, Gandikota Ramu, Narayanan Ramachandran, Karunamurthy A, and Alfrin Vickson. "Energy Harvesting and Optimization Using Broadcast Channel Approach for MIMO Systems in Wireless Sensor Networks." ECS Transactions 107, no. 1 (April 24, 2022): 16519–30. http://dx.doi.org/10.1149/10701.16519ecst.

Full text

Abstract:

EM or radio signal enabled WPT in particular. Since radio signals can carry power and information simultaneously, simultaneous data transmission and power transmission (SWIPT). A three-point wireless transmission system (MIMO), in which one receiver harvests power and the other receiver determines the data separately from the signals sent by the standard transmitter, and all transmitters and receivers probably have multiple antennas. Two scenarios are tested, in which the information receiver and the power receiver are separated and detect different MIMO channels from the transmitter, or which are collectively available and detect the same MIMO channel from the transmitter. In the case of split receivers, we find an appropriate transfer strategy to achieve various tradeoffs with a higher amount of data compared to a power transfer, which is reflected by a regional boundary rate-rate (R-E). In the case of co-acquisition recipients, we indicate the external boundary of the accessible R-E region due to the potential limit that power harvest recipients are not yet able to determine the exact details. Under this barrier, it investigates two cohesively formed cases, namely time shifts and power divisions, and then shows their accessible R-E regions in relation to the external boundary.

APA, Harvard, Vancouver, ISO, and other styles

32

Abdulhamid, Mohanad, and Hassan Omar. "Code Tracking of DSSS Signal over AWGN Channel." Scientific Bulletin of Electrical Engineering Faculty 19, no. 1 (April 1, 2019): 13–17. http://dx.doi.org/10.1515/sbeef-2019-0003.

Full text

Abstract:

AbstractDirect sequence spread spectrum (DSSS) communication systems offer significant performance advantages in view of their low probability of intercept, improved performance in multipath fading environments and their ability to avoid interference by spreading the signal over a wide bandwidth hence distributing the power. For the transmitted sequence to be correctly received and demodulated, the spreading sequence used at the receiver should be similar to that employed in the transmitter. This paper utilizes MATLAB Simulink to demonstrate a method of synchronizing the code clock at the receiver with the code clock at the transmitter. This fine alignment process is knownas code tracking.

APA, Harvard, Vancouver, ISO, and other styles

33

Ghariani, Nadia, Mondher Chaoui, Mongi Lahiani, and Hamadi Ghariani. "Design of ECG Transmitter for Wireless Biomedical Systems." International Review on Modelling and Simulations (IREMOS) 8, no. 3 (June 30, 2015): 301. http://dx.doi.org/10.15866/iremos.v8i3.6041.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

TAKEUCHI, Akira. "The transmitter role of glutamate in nervous systems." Japanese Journal of Physiology 37, no. 4 (1987): 559–72. http://dx.doi.org/10.2170/jjphysiol.37.559.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Hu, Wei-Wen. "Low Complexity Transmitter Architecture for Optical OFDM Systems." IEEE Communications Letters 25, no. 8 (August 2021): 2649–53. http://dx.doi.org/10.1109/lcomm.2021.3063742.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Ahmadzadeh, Arman, Vahid Jamali, and Robert Schober. "Molecule Harvesting Transmitter Model for Molecular Communication Systems." IEEE Open Journal of the Communications Society 3 (2022): 391–410. http://dx.doi.org/10.1109/ojcoms.2022.3155648.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Jinho Choi. "Interference mitigation using transmitter filters in CDMA systems." IEEE Transactions on Vehicular Technology 51, no. 4 (July 2002): 657–66. http://dx.doi.org/10.1109/tvt.2002.1015321.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

HASHEM, BASSAM M., and MOHAMED SAMY EL-HENNAWEY. "New GMSK transmitter structure for mobile radio systems." International Journal of Electronics 79, no. 3 (September 1995): 359–62. http://dx.doi.org/10.1080/00207219508926276.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Lok, T. M., and T. F. Wong. "Transmitter and receiver optimization in multicarrier CDMA systems." IEEE Transactions on Communications 48, no. 7 (July 2000): 1197–207. http://dx.doi.org/10.1109/26.855527.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Kim, Sehun, and Dongwoo Kim. "Otimum Transmitter Power Control In Celiular Radio Systems." INFOR: Information Systems and Operational Research 35, no. 1 (February 1997): 37–47. http://dx.doi.org/10.1080/03155986.1997.11732317.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

How, Jason Richard, and Simon de Lestang. "Acoustic tracking: issues affecting design, analysis and interpretation of data from movement studies." Marine and Freshwater Research 63, no. 4 (2012): 312. http://dx.doi.org/10.1071/mf11194.

Full text

Abstract:

Acoustic telemetry systems are an increasingly common way to examine the movement and behaviour of marine organisms. However, there has been little published on the methodological and analytical work associated with this technology. We tested transmitters of differing power outputs simultaneously in several trials, some lasting ~50 days, to examine the effects of power output and environmental factors (water movement, temperature, lunar cycle and time of day). There were considerable and volatile changes in detections throughout all trials. Increased water movement and temperature significantly reduced detection rates, whereas daytime and full-moon periods had significantly higher detection rates. All nine transmitters (from seven transmitter types tested) showed a sigmoidal trend between detection frequency and distance. Higher-powered transmitters had a prolonged detection distance with near-maximal detections, whereas lower-powered transmitters showed an almost immediate decline. Variation of detection frequency, transmitter type and the modelled relationship between distance and detection frequency were incorporated into a positioning trial which resulted in markedly improved position estimates over previous techniques.

APA, Harvard, Vancouver, ISO, and other styles

42

Wang, Xue Mei, Chun Yang Wang, Yu Chen, Yan Xin Yu, and Hong Yan Sun. "A Method for Designing Low Peak to Average Power Cognitive Radar Waveform." Applied Mechanics and Materials 716-717 (December 2014): 1055–59. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.1055.

Full text

Abstract:

In this paper, the basis function of TDCS system (Transform Domain Communication System) is used to design cognitive radar transmitter waveform. Based on the noise environment, the waveform can be adjusted adaptively. Then after clipping to reduce the PAPR (Peak to Average Power Ratio) of radar echo signal, the obtained signal is used as the next launch of the radar signal. The cognitive radar transmitter requires a nonlinear waveform to improve the efficiency of radar transmitter power amplifier, so reducing the PAPR of signal is essential. This paper presents the gray complementary sequence is applied to TDCS communication systems, and then it needs to reduce PAPR of signals by clipping. Proven, PAPR of the transmitted signal is maintained at about 3.25dB, and the signal has a low probability of intercept, high anti-interference ability and distant target detection range.

APA, Harvard, Vancouver, ISO, and other styles

43

Abdulhamid, Mohanad, and Gabriel Ogwali. "Design of Code Acquisition Method of FHSS System." Scientific Bulletin of Electrical Engineering Faculty 19, no. 1 (April 1, 2019): 1–5. http://dx.doi.org/10.1515/sbeef-2019-0001.

Full text

Abstract:

AbstractFrequency hopping spread spectrum (FHSS) communication systems offer significant performance advantages in view of their low probability of intercept, improved performance in multipath fading environments and their ability to avoid interference by hopping into low interference frequency channels. For the transmitted sequence to be correctly received and demodulated, the frequency hop sequence used at the receiver should be similar to that employed in the transmitter. Code acquisition infrequency hopping attempts to address this problem by providing a frequency hop pattern at the receiver that is nearly identical to that used at the transmitter. Code acquisition brings the alignment between the transmitter and the receiver hop pattern to at least one hop period. The main objective of this paper is to design and demonstrate a FHSS code acquisition method. The type of channel used is Additive White Gaussian Noise (AWGN).

APA, Harvard, Vancouver, ISO, and other styles

44

Šimko, Milan, Ján Michalík, and Milan Chupáč. "APPLICATION POSSIBILITIES OF THERMOVISION TECHNIQUE IN DIAGNOSTICS OF AERIAL SYSTEMS OF RADIO TRANSMITTERS." TRANSPORT 22, no. 1 (March 31, 2007): 24–27. http://dx.doi.org/10.3846/16484142.2007.9638091.

Full text

Abstract:

The paper deals with possibilities of use of thermovision technique in diagnostics of aerial systems of radio transmitters. Graphically presented: heating characteristic of the junction at the transmitter power of 60 % (slack and polluted junction); relationship between temperature of connection (feeder ‐ line, capacitor frame) spacing collar and power; relationship between temperature rise amount of connection and feeder line upon power; thermogram of the junction feeder line - spacing collar, capacity frame; thermogram of the junction feeder line ‐ spacing collar.

APA, Harvard, Vancouver, ISO, and other styles

45

Hwang, Woongi, Junseo Yang, and Jeongkyoon Lee. "A Study on the Improvement of the Management Method Indicators Lamp for Fire Alarm System." Journal of the Korean Society of Hazard Mitigation 20, no. 5 (October 31, 2020): 91–96. http://dx.doi.org/10.9798/kosham.2020.20.5.91.

Full text

Abstract:

The number of casualties in fire-related accidents has increased recently as fires have increased. Among facilities that reduce casualties in case of fire, the alarm is a fire-fighting facility that allows occupants to quickly evacuate to a safe space through alerts in case of danger. Location indicator lamps indicating the location of the transmitter in alarm systems play a very important role in the event of a fire. In the event of a fire, an alarm is issued through the transmitter, and fire transmitters ensure prompt action. However, performance control of the location indicator is not performed during inspection of the legal firefighting facility; only the lighting condition is checked. It is essential to maintain the performance of the location indicator of the transmitter, which can induce rapid evacuation and reduce casualties. This study investigated the performance state and management method of a position indicator lamp that can easily recognize the location of the transmitter. In the case of aging position indicators, it was found that the luminance was low and that identification could not be secured.

APA, Harvard, Vancouver, ISO, and other styles

46

Abboud, Izz K., Laith A. Kunbar, and Abbas S. Hassan. "Synchronization in DSSS system." International Review of Applied Sciences and Engineering 11, no. 2 (August 2020): 88–94. http://dx.doi.org/10.1556/1848.2020.20003.

Full text

Abstract:

AbstractDirect sequence spread spectrum (DSSS) communication systems offer huge performance focal points in perspective on their low probability of block, improved performance in multipath fading situations and their capacity to stay away from interference by spreading the signal over a wide bandwidth subsequently conveying the power. For the transmitted sequence to be effectively received and demodulated, the spreading sequence utilized at the receiver ought to be like that utilized in the transmitter. This paper uses MATLAB Simulink to show a technique for synchronizing the code clock at the receiver with the code clock at the transmitter. This fine arrangement procedure is known as code tracking.

APA, Harvard, Vancouver, ISO, and other styles

47

N K, Sushma. "Distributed Computing of DNA Cryptography and Randomly Generated Mealy Machine." International Journal for Research in Applied Science and Engineering Technology 10, no. 6 (June 30, 2022): 2516–23. http://dx.doi.org/10.22214/ijraset.2022.44050.

Full text

Abstract:

Abstract: The volumes of information created and saved in operating systems are growing at an alarming rate these days. Between all of these devices, massive volumes of essential and sensitive files are transmitted. As a result, ensuring the protection of all of these irreplaceable data is critical. Cryptography is a well-known method for ensuring data security. Cryptography's main goal is to transmitthe information from the source to the destination in the most secure method possible, preventing an adversary from extracting the actual datainformation. This research suggests a novel cryptographic algorithm depending on DNA encryption and the notion of restricted automata. The system consists of three components: cryptographic keys, a generator, a transmitter, and a transceiver. Based on the features of the receiver, the transmitter generates a 256-bit DNA-based secret key, which is used to encrypt information. The DNA sequence is then coded using a procedurally generated Mealy machine, that provides the ciphertext more safe. The suggested approach can defend the system from a variety of security attacks. This technique has provenits capacity to provide an individual user with better safe storage by dividing the user's vital information into bits.

APA, Harvard, Vancouver, ISO, and other styles

48

Kahn, A. R., E. Y. Chow, O. Abdel-Latief, and P. P. Irazoqui. "Low-Power, High Data Rate Transceiver System for Implantable Prostheses." International Journal of Telemedicine and Applications 2010 (2010): 1–8. http://dx.doi.org/10.1155/2010/563903.

Full text

Abstract:

Wireless telemetry is crucial for long-term implantable neural recording systems. RF-encoded neurological signals often require high data-rates to transmit information from multiple electrodes with a sufficient sampling frequency and resolution. In this work, we quantify the effects of interferers and tissue attenuation on a wireless link for optimal design of future systems. The wireless link consists of an external receiver capable of demodulating FSK/OOK transmission at speeds up to 8 Mbps, with <1e-5 bit-error rate (BER) without error correction, and a fully implanted transmitter consuming about 1.05 mW. The external receiver is tested with the transmitterin vivoto show demodulation efficacy of the transcutaneous link at high data-rates. Transmitter/Receiver link BER is quantified in typical and controlled RF environments for ex vivo andin vivoperformance.

APA, Harvard, Vancouver, ISO, and other styles

49

Montesinos, Ronald, Corinne Berland, Mazen Abi Hussein, Olivier Venard, and Philippe Descamps. "Analysis of RF power amplifiers in LINC systems." International Journal of Microwave and Wireless Technologies 4, no. 1 (January 5, 2012): 81–91. http://dx.doi.org/10.1017/s1759078711001085.

Full text

Abstract:

LInear amplification using Non-linear Components (LINC) is an architecture that achieves linear power amplification for radio-frequency (RF) transmitters. This paper describes the impact of RF power amplifiers (PAs) class on the overall system performances. The linearity and efficiency of the LINC transmitter with different PA classes (AB, B, C, D, E, F, F−1, and J) are evaluated and compared, in terms of error vector magnitude (EVM), adjacent channel leakage ratio (ACLR), and power added efficiency (PAE), for a 16QAM modulation having 5.6 dB peak to average power ratio. Simulations are performed using a gallium-nitride high electron mobility transistor (GaN HEMT) for a power amplifier with an output power of 10 W at 900 MHz.

APA, Harvard, Vancouver, ISO, and other styles

50

Lee, Hyeongwook, Seunghyun Boo, Gunyoung Kim, and Bomson Lee. "Optimization of Excitation Magnitudes and Phases for Maximum Efficiencies in a MISO Wireless Power Transfer System." Journal of Electromagnetic Engineering and Science 20, no. 1 (January 31, 2020): 16–22. http://dx.doi.org/10.26866/jees.2020.20.1.16.

Full text

Abstract:

This paper presents a method for solving receiver misalignment (axial or angular) problems in wireless power transfer systems using a multiple-input single-output system. The optimum magnitudes and phases of the transmitter voltages and receiver load for maximum efficiency are derived in convenient analytical forms when negligible mutual couplings between transmitters. These solutions are validated by genetic algorithm optimization and electromagnetic-simulation results for a design ex-ample of two transmitters and one rotating receiver.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Transmitter systems'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles