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31 results on '"Perry, Bradley T."'

1. Scalable In-Band Full-Duplex Phased Arrays: Complexity Reduction and Distributed Processing

Author

Kolodziej, Kenneth E., Janice, Brian A., Sands, Adrienne I., and Perry, Bradley T.

Abstract

Compared to traditional omnidirectional systems, in-band full-duplex (IBFD) phased arrays provide higher antenna gains and offer the ability to electronically steer beams spatially to improve communications/radar links and enable multifunction operation. While a variety of approaches have successfully incorporated self-interference cancellation (SIC) into arrays, their techniques do not scale beyond the limited sizes demonstrated. In addition to providing an overview on state-of-the-art IBFD arrays, this paper presents a novel complexity reduction method that uniquely applies infinite impulse response (IIR) filter modeling for the purpose of compensating for the dispersion effects of the array hardware. Using measured statistical performance, this process is demonstrated for a scalable array design covering 2700 to 3500 MHz, and exhibits a 10x reduction in computations for an array with 1000 elements. Additionally, the distribution of on-array SIC adaptive processing is discussed for aperture-level IBFD designs, including the use of cache-oblivious algorithms that can help facilitate real-time processing and lead to the realization of large-scale IBFD arrays.

Published
2023
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3. Scalable Array Technologies for Converged-RF Applications

Author

Kolodziej, Kenneth E., primary, Brigham, Glenn A., additional, Harger, Matthew A., additional, Janice, Brian A., additional, Sands, Adrienne I., additional, Weiner, Ian, additional, Wolfe, Pierre-Francois W., additional, Doane, Jonathan P., additional, and Perry, Bradley T., additional

Published
2022
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24. Photonic-Enabled RF Canceller for Wideband In-Band Full-Duplex Wireless Systems.

Author

Kolodziej, Kenneth E., Yegnanarayanan, Siva, and Perry, Bradley T.

Subjects
WIRELESS communications, BANDWIDTHS, PHOTONICS, BROADBAND communication systems, TECHNOLOGY
Abstract

In-band full-duplex (IBFD) wireless systems offer the ability to revolutionize frequency spectrum utilization for future networks. This is only possible if the self-interference generated by each wireless node is sufficiently mitigated, and becomes more challenging as the bandwidth increases. RF cancellation is one of the critical components that enables this interference reduction, but has previously been limited to narrowband operation or restricted to distinctive environments. This paper presents a novel RF canceller that utilizes photonic components to create a wideband vector modulator architecture with tunable time-delay taps. A prototype system with 20 canceller taps has been demonstrated to provide 25 and 20 dB of cancellation over 500-MHz and 1-GHz instantaneous bandwidths, respectively, and is tunable between 0.5 and 5.5 GHz. This unique photonic-enabled RF canceller design provides a path forward to achieve the wideband operation and high tap counts that will be required to successfully deploy future wireless systems with IBFD technology. [ABSTRACT FROM AUTHOR]

Published
2019
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29. The MIT IAP radar course: Build a small radar system capable of sensing range, Doppler, and synthetic aperture (SAR) imaging.

Author

Charvat, Gregory L., Fenn, Alan J., and Perry, Bradley T.

Abstract

MIT Lincoln Laboratory sponsored a radar short course at MIT campus during the January 2011 Independent Activities Period (IAP). The objective of this course was to generate student interest in applied electromagnetics, antennas, radio frequency (RF) electronics, analog circuits, and signal processing by building a short-range radar sensor and using it in a series of field tests. Lectures on the fundamentals of radar, modular RF design, antennas, pulse compression and synthetic aperture radar (SAR) imaging were presented. Teams of three students built a radar system from a kit. This kit was developed by the authors and uses a frequency modulated continuous wave (FMCW) architecture. To save costs, empty metal coffee cans are used for antennas, components are mounted on a wood block, the system uses only six coaxial microwave parts, analog circuitry on a solderless breadboard, and runs on eight AA batteries. Analog data is acquired by the audio input port on a laptop computer. The total cost of each kit was $360 which made this radar technology accessible to students. Of the nine student groups, all succeeded in building their radar, acquiring Doppler vs. time and range vs. time plots, seven succeeded in acquiring SAR imagery, and some groups improved the radar system. By presenting these difficult topics at a high level while at the same time making a radar kit and performing field experiments, students became self motivated to explore these topics and much interest in radar design was generated. [ABSTRACT FROM PUBLISHER]

Published
2012
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30. A Comparison of the Measured Pulse Response of Layered Materials Using Time- and Frequency-Domain Systems.

Author

Perry, Bradley T., Rothwell, Edward J., and Kempel, Leo C.

Subjects
ELECTRONIC pulse techniques, TIME-frequency analysis, PULSE generators, OSCILLOSCOPES, ELECTRIC network analyzers, FOURIER analysis, CALIBRATION, MATHEMATICAL analysis, SIGNAL generators
Abstract

A comparison is made between two systems used to measure the pulse response of layered materials. The first system was a direct time-domain system, using a pulse generator and a sampling oscilloscope. The second system was a frequency-domain system, and used a network analyzer with conversion to the time domain performed using Fourier analysis. The calibration procedure is described in detail, and the benefits and drawbacks of each system are discussed. Finally, typical results obtained using each system are examined. [ABSTRACT FROM AUTHOR]

Published
2007
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