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Journal articles on the topic 'Multichannle transceiver'

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Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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1

Takauchi, H., H. Tamura, S. Matsubara, M. Kibune, Yoshiyasu Doi, T. Chiba, H. Anbutsu, et al. "A CMOS multichannel 10-Gb/s transceiver." IEEE Journal of Solid-State Circuits 38, no. 12 (December 2003): 2094–100. http://dx.doi.org/10.1109/jssc.2003.818577.

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2

Hyun, Eugin, Young-Seok Jin, and Jong-Hun Lee. "Design and Implementation of 24 GHz Multichannel FMCW Surveillance Radar with a Software-Reconfigurable Baseband." Journal of Sensors 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/3148237.

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We designed and developed a 24 GHz surveillance FMCW (Frequency Modulated Continuous Wave) radar with a software-reconfigurable baseband. The developed radar system consists of transceiver, two selectable transmit antennas, eight parallel receive antennas, and a back-end module for data logging and to control the transceiver. The architecture of the developed radar system can support various waveforms, gain control of receive amplifiers, and allow the selection of two transmit antennas. To do this, we implemented the transceiver using a frequency synthesizer device and a two-step VGA (Variable Gain Amplifier) along with switch-controlled transmit antennas. To support high speed implementation features along with good flexibility, we developed a back-end module based on a FPGA (Field Programmable Gate Array) with a parallel architecture for the real-time data logging of the beat signals received from a multichannel 24 GHz transceiver. To verify the feasibility of the developed radar system, signal processing algorithms were implemented on a host PC. All measurements were carried out in an anechoic chamber to extract a 3D range-Doppler-angle map and target detections. We expect that the developed software-reconfigurable radar system will be useful in various surveillance applications.
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3

Diamantopoulos, Nikolaos-Panteleimon (Pandelis), Suguru Yamaoka, Takuro Fujii, Hidetaka Nishi, Koji Takeda, Tai Tsuchizawa, Takaaki Kakitsuka, and Shinji Matsuo. "47.5 GHz Membrane-III-V-on-Si Directly Modulated Laser for Sub-pJ/bit 100-Gbps Transmission." Photonics 8, no. 2 (January 27, 2021): 31. http://dx.doi.org/10.3390/photonics8020031.

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Near-future upgrades of intra data center networks and high-performance computing systems would require optical interconnects capable of operating at beyond 100 Gbps/lane. In order for this evolution to be achieved in a sustainable way, high-speed yet energy-efficient transceivers are in need. Towards this direction we have previously demonstrated directly-modulated lasers (DMLs) capable of operating at 50 Gbps/lane with sub-pJ/bit efficiencies based on our novel membrane-III-V-on-Si technology. However, there exists an inherent tradeoff between modulation speed and power consumption due to the carrier-photon dynamics in DMLs. In this work, we alleviate this tradeoff by introducing photon–photon resonance dynamics in our energy-efficient membrane DMLs-on-Si design and demonstrate a device with a maximum 3-dB bandwidth of 47.5 GHz. This denotes a bandwidth increase of more than 2x times compared to our previous membrane DMLs-on-Si. Moreover, the DML is capable of delivering 60-GBaud PAM-4 signals under Ethernet’s KP4-FEC threshold (net data rate of 113.42 Gbps) over 2-km of standard single-mode fiber transmission. DC energy-efficiencies of 0.17 pJ/bit at 25 °C and 0.34 pJ/bit at 50 °C have been achieved for the > 100-Gbps signals. Deploying such DMLs in an integrated multichannel transceiver should ensure a smooth evolution towards Terabit-class Ethernet links and on-board optics subsystems.
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4

Meng, Miao, Hossein Rahmanian Kooshkaki, Xiaoyang Wang, Shih-Kai Kuo, Erda Wen, and Patrick P. Mercier. "A GMSK/PAM4 Multichannel Magnetic Human Body Communication Transceiver." IEEE Solid-State Circuits Letters 5 (2022): 66–69. http://dx.doi.org/10.1109/lssc.2022.3158691.

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5

Green, Samuel I. "Multichannel bit error rate tester for fiber optic transceiver testing." Review of Scientific Instruments 73, no. 8 (August 2002): 3125–27. http://dx.doi.org/10.1063/1.1490420.

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6

Hannula, Jari-Matti, Tapio Saarinen, Jari Holopainen, and Ville Viikari. "Frequency Reconfigurable Multiband Handset Antenna Based on a Multichannel Transceiver." IEEE Transactions on Antennas and Propagation 65, no. 9 (September 2017): 4452–60. http://dx.doi.org/10.1109/tap.2017.2725384.

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7

Meaney, Paul, Alexander Hartov, Timothy Raynolds, Cynthia Davis, Sebastian Richter, Florian Schoenberger, Shireen Geimer, and Keith Paulsen. "Low Cost, High Performance, 16-Channel Microwave Measurement System for Tomographic Applications." Sensors 20, no. 18 (September 22, 2020): 5436. http://dx.doi.org/10.3390/s20185436.

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We have developed a multichannel software defined radio-based transceiver measurement system for use in general microwave tomographic applications. The unit is compact enough to fit conveniently underneath the current illumination tank of the Dartmouth microwave breast imaging system. The system includes 16 channels that can both transmit and receive and it operates from 500 MHz to 2.5 GHz while measuring signals down to −140 dBm. As is the case with multichannel systems, cross-channel leakage is an important specification and must be lower than the noise floors for each receiver. This design exploits the isolation inherent when the individual receivers for each channel are physically separate; however, these challenging specifications require more involved signal isolation techniques at both the system design level and the individual, shielded component level. We describe the isolation design techniques for the critical system elements and demonstrate specification compliance at both the component and system level.
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8

Zhang, Feng, and Yusong Qiu. "A 3 Gb/s multichannel transceiver in 65 nm CMOS technology." Journal of Semiconductors 36, no. 1 (January 2015): 015003. http://dx.doi.org/10.1088/1674-4926/36/1/015003.

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9

Liu, K., Y. Li, Z. Xu, and F. Liu. "Exploiting maximum performance of multichannel multiple access using half-duplex transceiver." Electronics Letters 47, no. 23 (2011): 1280. http://dx.doi.org/10.1049/el.2011.2728.

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10

Kavitha, A., V. Prabhu, D. Ruban Thomas, D. Banupriya, S. Dharanya, and M. Roobini. "A Design of Multichannel Data Transmission Through Power Line Communication." International Journal of Engineering & Technology 7, no. 2.24 (April 25, 2018): 4. http://dx.doi.org/10.14419/ijet.v7i2.24.11958.

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Smart Metering in the power grid is the present popular technology in and around the world. Future Generation is requiring new method for data transfer. This paper introduces a novel method called Power Line Communication (PLC) transceivers. PLC has many number of smart grid applications. This work proposes mainly about the transmission of data’s through Power Line. This work includes both electrical and electronic concept. Here, transmission process takes place through electrical line by using electronic equipment. This paperaddresses the important role of transferring data’s from one place to other. In this concept, dc loads are controlled by giving commands through power line. This work does not require additional medium for transmitting data’s. This paper reduces the human efforts and systematic transmission takes place. In this work, data transmission through power line communication takes place by passing constant 5v. Hence fluctuations are avoided in PLC transceivers, this protects the electronic device and dc load from damage. Here the dc loads are operated by giving ON and OFF commands. These commands can be coded in binary form or it can also be variables. Voltage sensors are used for sensing the current at the receiver (dc loads). The current which is sensed by the sensors are stored by using batteries. These currents can be retrieved for future use. This paperprovides advancement in data transmission process for future generation.
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11

Chow, P. S., J. C. Tu, and J. M. Cioffi. "Performance evaluation of a multichannel transceiver system for ADSL and VHDSL services." IEEE Journal on Selected Areas in Communications 9, no. 6 (1991): 909–19. http://dx.doi.org/10.1109/49.93101.

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12

Hu, Xing, Linhua Ma, Shaocheng Huang, Tianyu Huang, and Shiping Liu. "Dynamic Channel Slot Allocation Scheme and Performance Analysis of Cyclic Quorum Multichannel MAC Protocol." Mathematical Problems in Engineering 2017 (2017): 1–16. http://dx.doi.org/10.1155/2017/8580913.

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In high diversity node situation, multichannel MAC protocol can improve the frequency efficiency, owing to fewer collisions compared with single-channel MAC protocol. And the performance of cyclic quorum-based multichannel (CQM) MAC protocol is outstanding. Based on cyclic quorum system and channel slot allocation, it can avoid the bottleneck that others suffered from and can be easily realized with only one transceiver. To obtain the accurate performance of CQM MAC protocol, a Markov chain model, which combines the channel-hopping strategy of CQM protocol and IEEE 802.11 distributed coordination function (DCF), is proposed. The results of numerical analysis show that the optimal performance of CQM protocol can be obtained in saturation bound situation. And then we obtain the saturation bound of CQM system by bird swarm algorithm. In addition, to improve the performance of CQM protocol in unsaturation situation, a dynamic channel slot allocation of CQM (DCQM) protocol is proposed, based on wavelet neural network. Finally, the performance of CQM protocol and DCQM protocol is simulated by Qualnet platform. And the simulation results show that the analytic and simulation results match very well; the DCQM performs better in unsaturation situation.
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13

Kim, Seong-Cheol. "Design and Performance Analysis of the Multichannel I. F. Transceiver for Broadband Multimedia System." Journal of the Korean Institute of Information and Communication Engineering 15, no. 5 (May 30, 2011): 1038–44. http://dx.doi.org/10.6109/jkiice.2011.15.5.1038.

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14

Li, Linpu, Rong Qian, and Xiao-Wei Sun. "W-BAND SINGLE-POLE FOUR-THROW SWITCH FOR MULTICHANNEL HIGH POWER TRANSCEIVER CHIPSET DESIGN." Progress In Electromagnetics Research M 81 (2019): 107–16. http://dx.doi.org/10.2528/pierm19042701.

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15

Huang, Xiaojing, Y. Jay Guo, and Jian A. Zhang. "Transceiver I/Q Imbalance Self-Calibration With Phase-Shifted Local Loopback for Multichannel Microwave Backhaul." IEEE Transactions on Wireless Communications 15, no. 11 (November 2016): 7657–69. http://dx.doi.org/10.1109/twc.2016.2605679.

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16

Picun, Gonzalo, Khalil El-Falahi, Christophe Pautrel, Yoann Duse, Nicolas Joubert, Anaud Anotta, Georget Lemoyne, et al. "More than Drivers in Motor Drives: Closing the Loop." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, HiTEN (January 1, 2015): 000179–88. http://dx.doi.org/10.4071/hiten-session5-paper5_3.

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This paper presents the problematic associated to the design of a complete motor drive, exposing all available and missing blocks at this moment. We proceed by dividing the power drive into basic functions – control, different power supplies, isolated communication, controller interfacing, current monitoring – and we present for each of these functions an implementation example. Implementation examples shown are based on high-temperature X-REL parts such as XTR26020 Isolated Intelligent Gate Driver, XTR40010 Isolated Two Channel Transceiver, XTR30010 PWM Controller, XTR70010 and XTR70020 Low-dropout Linear Regulators and XTR50010 Bidirectional Multichannel Level Translator. A drive solution based on the XTR26020, presented for the first time in this paper, is explained and compared against previous art. Main characteristics of the new linear regulator XTR70020 are presented, showing the best-in-class dropout voltage, which outperforms the closest competitor by a factor of three. For all parts featured, tests results at an ambient temperature up to 230°C (even higher in some cases) are presented.
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17

He, Huimin, Fengman Liu, Haiyun Xue, Peng Wu, Mangu Song, Cheng Chen, Yu Sun, and Liqiang Cao. "Design and Implementation of a High-Coupling and Multichannel Optical Transceiver With a Novel Packaging Structure." IEEE Transactions on Components, Packaging and Manufacturing Technology 7, no. 11 (November 2017): 1882–90. http://dx.doi.org/10.1109/tcpmt.2017.2707579.

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18

Nouh, Mostafa. "Multichannel frequency-selective beaming in time-modulated electroacoustic phased arrays." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A155. http://dx.doi.org/10.1121/10.0010954.

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Acoustic phased arrays have been a cornerstone of non-destructive evaluation, sonar communications, and medical imaging for years. Conventional arrays work by imparting a static phase gradient across a set of acoustic transceivers to steer a self-created wavefront in a desired direction. In a reception mode, they abide by basic reciprocity principles and exhibit the strongest gain for waves incident from the same direction to which they transmit. This talk sheds light on a class of dynamic phased arrays which is capable of (a) generating multiple scattered harmonics of a single-frequency voltage input which simultaneously propagate in different directional lanes and (b) exhibiting non-identical TX/RX patterns. We will show that such lanes emerge in the form of artificially-synthesized directional channels each with a distinct frequency signature that can be predicted a priori. To achieve this, we devise a class of phase shifters, which augment the array elements with a dynamic phase modulation using an array of piezo-wafer discs bonded to an elastic medium. The scattered beams propagate simultaneously in the transmitted wave field but can be visualized using an FFT of the time-transient measurements via laser Doppler vibrometry. The experimental realization illustrates the array’s ability to guide incident waves within tunable frequency channels that are commensurate with the modulation rate and along the intended directions.
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19

Kim, Jung-Hwan, Chan Hong Moon, Bum-Woo Park, Alessandro Furlan, Tiejun Zhao, and Kyongtae T. Bae. "Multichannel transceiver dual-tuned RF coil for proton/sodium MR imaging of knee cartilage at 3 T." Magnetic Resonance Imaging 30, no. 4 (May 2012): 562–71. http://dx.doi.org/10.1016/j.mri.2011.12.011.

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20

Guo, Cheng, Jin Lin, Lian-Chen Han, Na Li, Li-Hua Sun, Fu-Tian Liang, Dong-Dong Li, et al. "Low-latency readout electronics for dynamic superconducting quantum computing." AIP Advances 12, no. 4 (April 1, 2022): 045024. http://dx.doi.org/10.1063/5.0088879.

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Dynamic quantum computing can support quantum error correction circuits to build a large general-purpose quantum computer, which requires electronic instruments to perform the closed-loop operation of readout, processing, and control within 1% of the qubit coherence time. In this paper, we present low-latency readout electronics for dynamic superconducting quantum computing. The readout electronics use a low-latency analog-to-digital converter to capture analog signals, a field-programmable gate array (FPGA) to process digital signals, and the general I/O resources of the FPGA to forward the readout results. Running an algorithm based on the design of multichannel parallelism and single instruction multiple data on an FPGA, the readout electronics achieve a readout latency of 40 ns from the last sample input to the readout valid output. The feedback data link for cross-instrument communication shows a communication latency of 48 ns when 16 bits of data are transmitted over a 2 m-length cable using a homologous clock to drive the transceiver. With codeword-based triggering mechanisms, readout electronics can be used in dynamic superconducting quantum computing.
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21

Kalita, S., R. Kaushik, M. Jajoo, and P. P. Sahu. "Performance Enhancement of a Multichannel Uncoordinated Code Hopping DSSS Signaling Scheme Using Multipath Fading Compensator." Journal of Circuits, Systems and Computers 25, no. 11 (August 14, 2016): 1650145. http://dx.doi.org/10.1142/s0218126616501450.

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In this paper, a multipath fading compensator(MFC) has been introduced and demonstrated to reduce the signal distortion which arose due to Doppler effect, multipath propagation and self-interference for a multichannel uncoordinated code hopping direct sequence spread spectrum (UCH-DSSS) signaling in underwater communication. The bit error rate (BER) performance analysis of the proposed system obtained both analytically and using P-Spice circuit simulation model with and without jamming signal is presented. It is observed that the BER is independent of the frequencies (used in focused acoustic field (FAF) experiments FAF-06 and FAF-05) and is also less than those of the previous works. Oscilloscope traces indicate that the experimental waveform of the proposed four-channel UCH-DSSS transceiver is almost close to those obtained using P-Spice circuit simulation. The experimental values of BER measured by BER meter also matched well with the BER obtained theoretically. Noise margin and distortion performance also are analyzed from the eye pattern which shows that noise margin and distortion also are independent of frequencies (used in both FAF-06 and FAF-05) and the bandwidth of operation of FAF-06 is [Formula: see text]5.5 times more than that of FAF-05.
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22

Gao, Yiran, Jian Dai, Zhonghan Wu, Tian Zhang, and Kun Xu. "Low phase noise coherent transceiver front-end for X-band multichannel chirped radar based on phase-synchronous optoelectronic oscillator." Optics Communications 460 (April 2020): 125194. http://dx.doi.org/10.1016/j.optcom.2019.125194.

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23

Потехин, Александр, Aleksandr Potekhin, Артём Сетов, Artem Setov, Валентин Лебедев, Valentin Lebedev, Андрей Медведев, Andrey Medvedev, Дмитрий Кушнарев, and Dmitriy Kushnarev. "Prospective IS-MST radar. Potential and diagnostic capabilities." Solar-Terrestrial Physics 2, no. 3 (October 27, 2016): 3–21. http://dx.doi.org/10.12737/22281.

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In the next few years, a new radar is planned to be built near Irkutsk. It should have capabilities of incoherent scatter (IS) radars and mesosphere-stratosphere-troposphere (MST) radars [Zherebtsov et al., 2011]. The IS-MST radar is a phased array of two separated antenna panels with a multichannel digital receiving system, which allows detailed space-time processing of backscattered signal. This paper describes characteristics, configuration, and capabilities of the antenna and transceiver systems of this radar. We estimate its potential in basic operating modes to study the ionosphere by the IS method at heights above 100 km and the atmosphere with the use of signals scattered from refractive index fluctuations, caused by turbulent mixing at heights below 100 km. The modeling shows that the radar will allow us to regularly measure neutral atmosphere parameters at heights up to 26 km as well as to observe mesosphere summer echoes at heights near 85 km in the presence of charged ice particles (an increase in Schmidt number) and mesosphere winter echoes at heights near 65 km with increasing background electron density. Evaluation of radar resources at the IS mode in two height ranges 100–600 and 600–2000 km demonstrates that in the daytime and with the accumulation time of 10 min, the upper boundaries of electron density and ionospheric plasma temperature are ~1500 and ~1300 km respectively, with the standard deviation of no more than 10 %. The upper boundary of plasma drift velocity is ~1100 km with the standard deviation of 45 m/s. The estimation of interferometric capabilities of the MST radar shows that it has a high sensitivity to objects of angular size near 7.5 arc min, and its potential accuracy in determining target angles can reach 40 arc sec.
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24

Потехин, Александр, Aleksandr Potekhin, Артём Сетов, Artem Setov, Валентин Лебедев, Valentin Lebedev, Андрей Медведев, Andrey Medvedev, Дмитрий Кушнарев, and Dmitriy Kushnarev. "Prospective IS-MST radar. Potential and diagnostic capabilities." Solnechno-Zemnaya Fizika 2, no. 3 (September 17, 2016): 3–16. http://dx.doi.org/10.12737/19444.

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In the next few years, a new radar is planned to be built near Irkutsk. It should have capabilities of incoherent scatter (IS) radars and mesosphere-stratosphere-troposphere (MST) radars [Zherebtsov et al., 2011]. The IS-MST radar is a phased array of two separated antenna panels with a multichannel digital receiving system, which allows detailed space-time processing of backscattered signal. This paper describes characteristics, configuration, and capabilities of the antenna and transceiver systems of this radar. We estimate its potential in basic operating modes to study the ionosphere by the IS method at heights above 100 km and the atmosphere with the use of signals scattered from refractive index fluctuations, caused by turbulent mixing at heights below 100 km. The modeling shows that the radar will allow us to regularly measure neutral atmosphere parameters at heights up to 26 km as well as to observe mesosphere summer echoes at heights near 85 km in the presence of charged ice particles (an increase in Schmidt number) and mesosphere winter echoes at heights near 65 km with increasing background electron density. Evaluation of radar resources at the IS mode in two height ranges 100–600 and 600–2000 km demonstrates that in the daytime and with the accumulation time of 10 min, the upper boundaries of electron density and ionospheric plasma temperature are ~1500 and ~1300 km respectively, with the standard deviation of no more than 10 %. The upper boundary of plasma drift velocity is ~1100 km with the standard deviation of 45 m/s. The estimation of interferometric capabilities of the MST radar shows that it has a high sensitivity to objects of angular size near 7.5 arc min, and its potential accuracy in determining target angles can reach 40 arc sec.
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25

Wu, Ming-Xing, De-Yang Tian, Pu Tang, Jing Tian, Zhi-Yuan He, and Ping Ma. "Inversion method of two-dimensional distribution of electron density in hypersonic model wake." Acta Physica Sinica 71, no. 11 (2022): 115202. http://dx.doi.org/10.7498/aps.70.20212345.

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The ballistic target uses a two-stage light gas gun to launch the model into a hypersonic state, and the model forms a plasma wake when flying at a hypersonic speed in the target chamber. In order to obtain the radial two-dimensional distribution of transient plasma electron density in the wake of hypervelocity model, a seven-channel Ka-band microwave interferometer measuring system is developed. In the transceiver system, a transmitting antenna achieves the plane wave irradiation plasma, and a seven-port array antenna is used to receive plane waves which are passing through the plasma: the antenna beam can completely cover the radial range of the wake. The shortest response time of measuring system is 1 s, and electron density measurement range of the interferometer measuring system is 10<sup>11</sup>–10<sup>13</sup>/cm<sup>3</sup> . The plasma is often treated as layered medium in data processing of multichannel microwave interferometer. Taking into consideration the effect of refraction on the stratified interface in this work, the ray tracing (RT) method is used to establish the electromagnetic propagation model. Combined with the measurement data to construct the objective function, the genetic algorithm (GA) is used to invert the radial two-dimensional distribution of the electron density under different test conditions. The result shows good agreement with the numerical simulation under the same test state, which proves the the data processing method reliable. Then, the influence of the layered model on the calculation result is analyzed, which shows that the seven-layer model is suitable for the wake modeling under given experimental conditions, and thus maximizing the number of receiving channels and ensuring the accuracy. The RT method is used for the first time to achieve the two-dimensional distribution of electron density in the wake of hypervelocity projectile, and some rules of two-dimensional electron density distribution of the hypersonic model under given experimental conditions are realized.
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26

saoudi, Hanen, and Hamadi Ghariani. "A Digitally Controlled Multichannel Spectrally Efficient Low-Power Transceiver for Ultra-Wideband Cognitive Radio Applications." Journal of Circuits, Systems and Computers, April 12, 2021, 2150208. http://dx.doi.org/10.1142/s021812662150208x.

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A multichannel transceiver design with low hardware complexity, flexibility and efficient spectrum use intended for Impulse Radio (IR) Ultra-Wideband (UWB) apertures, is proposed in this paper. The transceiver supports 14 channels and is implemented in TSMC CMOS process. The transmitter adopts a symmetrical triangular narrow pulse generator, a multiband LC-VCO, a mixer and a Variable-Gain Amplifier. A digital control of transmitter output power and carrier frequency is achieved by a current-steering Digital-to-Analog Converter (CS-DAC). The receiver follows the noncoherent Energy Detection (ED) scheme including Low-Noise Amplifier (LNA) which takes the benefits of the body biasing technique to further reduce power consumption, squarer and comparator. The LNA achieves high gain of up to 30[Formula: see text]dB allowing to enhance the receiver sensitivity which is [Formula: see text]83.7[Formula: see text]dBm at 25[Formula: see text]Mbps. The transmitter provides output pulses with a width of 3[Formula: see text]ns, a pulse repetition rate of 20[Formula: see text]ns and a maximum Power Spectral Density (PSD) of [Formula: see text]42[Formula: see text]dBm/MHz. The power consumptions of transmitter and receiver are 35.6[Formula: see text]pJ/bit and 0.207[Formula: see text]nJ/bit at 25[Formula: see text]Mbps, respectively. Maximizing utilization of the scarce wireless spectrum, enhancing spectral flexibility and efficiency and reducing power consumption are the main contributions brought by this work, enabling this transceiver to be able to deal with the current debate on producing single multifunctional Cognitive Radio (CR) UWB systems.
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27

Sangirov, Jamshid, Mohammad Rakib-Uddin, Gulomjon Sangirov, Ikechi Augustine Ukaegbu, Bikash Nakarmi, Tae-Woo Lee, and Hyo-Hoon Park. "Design and analysis of a multichannel transceiver for high-speed optical interconnects." Optical and Quantum Electronics 48, no. 1 (December 29, 2015). http://dx.doi.org/10.1007/s11082-015-0316-x.

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28

Yang, Donghai, Yifan Liu, Qingjiu Chen, Meng Chen, Shaodong Zhan, Nim-kwan Cheung, Ho-Yin Chan, Zhidong Wang, and Wen Jung Li. "Development of the high angular resolution 360° LiDAR based on scanning MEMS mirror." Scientific Reports 13, no. 1 (January 27, 2023). http://dx.doi.org/10.1038/s41598-022-26394-6.

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AbstractLight detection and ranging (LiDAR) using various operational principles has been applied in many fields, e.g., robotics navigation, autonomous vehicles, unmanned aerial flyers, land surveying, etc. The multichannel LiDAR system is of great importance in the field of autonomous driving due to its larger field of view (FoV). However, the number of transceivers limits the vertical angular resolution of multichannel LiDAR systems and makes them costly. On the other hand, the emergence of microelectromechanical systems (MEMS) mirrors may provide a highly promising solution to a low-cost, high angular resolution LiDAR system. We have demonstrated a MEMS mirror-based 360° LiDAR system with high angular resolution and will present the detailed design process and obtained experimental results in this paper. With the combination of the MEMS mirror and a rotation platform for the LiDAR system, a 360° × 8.6° (horizontal × vertical) FoV was achieved. Compared with existing commercial multichannel 360° LiDAR systems, our system has 13.8 times better angular resolution than the Velodyne HDL-64 LiDAR sensor. The experimental results verified an excellent performance of 0.07° × 0.027° (horizontal × vertical) angular resolution, which enhances the panoramic scanning and imaging capability of the LiDAR system, potentially providing more accurate 3D scanning applications in areas such as autonomous vehicles, indoor surveying, indoor robotics navigation, etc.
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29

Shupe, Larry E., Frank P. Miles, Geoff Jones, Richy Yun, Jonathan Mishler, Irene Rembado, R. Logan Murphy, Steve I. Perlmutter, and Eberhard E. Fetz. "Neurochip3: An Autonomous Multichannel Bidirectional Brain-Computer Interface for Closed-Loop Activity-Dependent Stimulation." Frontiers in Neuroscience 15 (August 19, 2021). http://dx.doi.org/10.3389/fnins.2021.718465.

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Toward addressing many neuroprosthetic applications, the Neurochip3 (NC3) is a multichannel bidirectional brain-computer interface that operates autonomously and can support closed-loop activity-dependent stimulation. It consists of four circuit boards populated with off-the-shelf components and is sufficiently compact to be carried on the head of a non-human primate (NHP). NC3 has six main components: (1) an analog front-end with an Intan biophysical signal amplifier (16 differential or 32 single-ended channels) and a 3-axis accelerometer, (2) a digital control system comprised of a Cyclone V FPGA and Atmel SAM4 MCU, (3) a micro SD Card for 128 GB or more storage, (4) a 6-channel differential stimulator with ±60 V compliance, (5) a rechargeable battery pack supporting autonomous operation for up to 24 h and, (6) infrared transceiver and serial ports for communication. The NC3 and earlier versions have been successfully deployed in many closed-loop operations to induce synaptic plasticity and bridge lost biological connections, as well as deliver activity-dependent intracranial reinforcement. These paradigms to strengthen or replace impaired connections have many applications in neuroprosthetics and neurorehabilitation.
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Wu Ming-Xing, Tian De-Yang, Tang Pu, Tian Jing, He Zhiyuan, and Ma Ping. "Study on Retrieval Method of Two-dimensional Distribution of Hypersonic Model Wake Electron Density." Acta Physica Sinica, 2022, 0. http://dx.doi.org/10.7498/aps.71.20212345.

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Abstract:
The ballistic range uses a two-stage light gas gun to launch the model into a hypersonic state, and the model form a plasma wake when flying at hypersonic speed in the target chamber. In order to obtain the radial two-dimensional distribution of transient plasma electron density in the wake of hypervelocity model, a seven channels Ka-band microwave interferometer measuring system was developed. In the transceiver system, one transmitting antenna to achieve plane wave irradiation plasma, and a seven-port array antenna is used to receive plane waves which passing through the plasma, the antenna beam can completely cover the radial range of the wake. Measuring system shortest response time and electron density measurement range of the interferometer measuring system are 1<teshuzifu>ms and 10<sup>11</sup>-10<sup>13</sup>/cm<sup>3</sup> respectively. Plasma is often treated as layered medium in data processing of multichannel microwave interferometer, consider the effect of refraction on the stratified interface, in this work, the ray tracing(RT) method is used to establish the electromagnetic propagation model, combined with the measurement data to construct the objective function, and the genetic algorithm(GA) is used to invert the radial two-dimensional distribution of the electron density under different test conditions. The result shows that it is in good agreement with the numerical simulation under the same test state, which proves the reliability of the validity of the data processing method. Then, the influence of the layered model on the calculation result is analyzed, which shows that the seven-layers model is suitable for the wake modeling under given experimental conditions, maximizing the number of receiving channels and ensuring the accuracy. RT method is used for the first time to achieve the two-dimensional distribution of electron density in the wake of hypervelocity projectile, and some rules of two-dimensional electron density distribution of the hypersonic model under given experimental conditions are realized.
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