Full Analog Broadband Time-Reversal Module for Ultra-Wideband Communication System

Wang, Zhipeng; Wang, Bing‐Zhong; Zhao, Deshuang; Ren, Wei

doi:10.1109/jphot.2019.2936501

Cited by 6 publications

(5 citation statements)

References 26 publications

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“…With a programmable filter to shape the spectrum and an EOM to load the microwave signal, the signal can be easily stretched or compressed in a dispersive element. Based on this operation, Fourier transform [106]- [108], pulse coding [109], [110], sampling and quantization [111]- [113], filtering [114]- [116], and time reversal [117] can be achieved. In addition, the spectral lines of the OFCs can be separated in the spatial domain using an optical diffraction grating.…”

Section: Broadband Analog Signal Processingmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

315

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As the only method for all-weather, all-time and longdistance target detection and recognition, radar has been intensively studied since it was invented, and is considered as an essential sensor for future intelligent society. In the past few decades, great efforts were devoted to improving radar's functionality, precision, and response time, of which the key is to generate, control and process a wideband signal with high speed. Thanks to the broad bandwidth, flat response, low loss transmission, multidimensional multiplexing, ultrafast analog signal processing and electromagnetic interference immunity provided by modern photonics, implementation of the radar in the optical domain can achieve better performance in terms of resolution, coverage, and speed which would be difficult (if not impossible) to implement using traditional, even state-of-the-art electronics. In this tutorial, we overview the distinct features of microwave photonics and some key microwave photonic technologies that are currently known to be attractive for radars. System architectures and their performance that may interest the radar society are emphasized. Emerging technologies in this area and possible future research directions are discussed.

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Section: Broadband Analog Signal Processingmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

315

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“…So the TR technique can adaptively compensate for the phase generated by the channel and focus signals. Since the TR technique was introduced into electromagnetics (Lerosey et al., 2004), it has been widely used in the fields of super‐resolution focusing (Ding et al., 2013; Ge et al., 2011; Lerosey et al., 2007), high‐precision positioning (Li, Liu, Zhao, & Hu, 2019; Liang, 2020; Zhou et al., 2014, 2015), wireless power transmission (An et al., 2021; Ku et al., 2016; Li, Liu, Zhang, et al., 2019; Liu et al., 2011; Park & Hong, 2020, 2021; Y. Wang et al., 2021; Yang et al., 2021; Zhao, Yue, et al., 2012), spatial power combination (Q. Chen et al., 2015; Tian, 2019; Z. Wang et al., 2019; Zhong & Liao, 2016), and so on. In addition, Wang's team has also carried out a series of research on TR technology in shaping electromagnetic fields (Z. Chen et al., 2021; Li, Zhao, et al., 2019), wireless communication (Jin et al., 2013; Z. Wang et al., 2019; Zhao et al., 2014), beam‐steering (Zhao, Jin, et al., 2012), and other fields.…”

Section: Introductionmentioning

confidence: 99%

Influence of Time‐Varying Atmospheric Channel on Time Reversal Spatial Power Combination of Sparse Array on Ground

Zhao

2023

Radio Science

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The spatial power combination based on the time reversal (TR) technique is severely affected by the time‐varying characteristics of channels. In this paper, a mathematical model of TR power combination in the slowly time‐varying atmospheric channel and the concept of channel time‐varying factor are proposed to study the feasibility of this technique for spatial power combination in incompletely reciprocal channels. Combining the theoretical analysis and Monte Carlo simulations, we analyze the relationship between the power combination efficiency and the permittivity of the time‐varying atmospheric channel, which follows a normal distribution. The results indicate that the power combination efficiency of the TR technique will be lower than that of the completely reciprocal channel if the atmospheric channel is slowly varied, and the faster the channel changes, the lower the efficiency becomes. In order to keep the power combination efficiency above 50%, the channel time‐varying factor needs to be less than about 54.3% of the signal period. And when it takes more than 90%, the signals radiated by each antenna have been completely incoherent at target point. Different from the short‐distance power combination, when the target point is far away and at a high altitude, the time‐variability of the atmosphere over such a huge area is not negligible, so the power combination efficiency will be also severely affected. The mathematical model and results of this study can provide a theoretical basis for further research of long‐distance spatial power combination based on the TR technology and error estimation in related engineering design.

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“…To probe them, one can use either classical channel estimation techniques or impedance modulation ones [4]. As for the flipping operation, it is performed by the transmitter either directly on the digitalized signals or by an analog device [5].…”

Section: Introductionmentioning

confidence: 99%

“…From a communication theory perspective, TR is a precoding technique that can be used both for Single-Input Single-Output (SISO) and Multiple-Input Single-Output (MISO) impulse radio UWB wireless communication systems [5], [9], [10]. Ten years ago, Time Reversal Division Multiple Access (TRDMA) was introduced to spatiotemporally focus messages to different users [11], i.e., for multi-user MISO configurations.…”

Section: Introductionmentioning

confidence: 99%

Time Reversal for Multiple Access and Mobility: Algorithmic Design and Experimental Results

Mokh

Rosny

Alexandropoulos

et al. 2022

2022 IEEE Wireless Communications and Networking Conference (WCNC)

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Time Reversal (TR) has been proposed as a competitive precoding strategy for low-complexity devices, relying on ultra-wideband waveforms. This transmit processing paradigm can address the need for low power and low complexity receivers, which is particularly important for the Internet of Things, since it shifts most of the communications signal processing complexity to the transmitter side. Due to its spatio-temporal focusing property, TR has also been used to design multiple access schemes for multi-user communications scenarios. However, in wideband time-division multiple access schemes, the signals received by users suffer from significant levels of inter-symbol interference as well as interference from uncoordinated users, which often require additional processing at the receiver side. This paper proposes an iterative TR scheme that aims to reduce the level of interference in wideband multi-user settings, while keeping the processing complexity only at the transmitter side. The performance of the proposed TR-based protocol is evaluated using analytical derivations. In addition, its superiority over the conventional Time Reversal Division Multiple Access (TRDMA) scheme is demonstrated through simulations as well as experimental measurements at 2.5 GHz carrier frequency with variable bandwidth values.

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Full Analog Broadband Time-Reversal Module for Ultra-Wideband Communication System

Cited by 6 publications

References 26 publications

Microwave Photonic Radars

Microwave Photonic Radars

Influence of Time‐Varying Atmospheric Channel on Time Reversal Spatial Power Combination of Sparse Array on Ground

Time Reversal for Multiple Access and Mobility: Algorithmic Design and Experimental Results

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