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检索条件"机构=VLSI Circuits and Systems Laboratory Department of Electrical and Computer Engineering"

共 144 条记录，以下是51-60 订阅

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Calculation of the radar ambiguity function from time-domain measurement data for real-time, amplifier-in-the-loop waveform optimization

Calculation of the radar ambiguity function from time-domain...

引用

82nd ARFTG Microwave Measurement Conference: Characterization, Modeling, and Design of RF and mm-Wave Devices and circuits, ARFTG 2013

作者： Fellows, Matthew Baylis, Charles Cohen, Lawrence Marks II, Robert J. Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX United States Naval Research Laboratory Radar Division Washington DC United States

ISBN: (纸本)9781467349826

The ambiguity function is a measure of a radar's range and Doppler detection capability. Cognitive radar systems require the capability to adjust the waveform in realtime to obtain desired range/Doppler detection capability while meeting stringent spectral requirements. While the ambiguity function of the waveform input to the transmitter can be simulated, it is the ambiguity function of the transmitter power amplifier's output waveform that will be used for the detection. As such, it is very helpful to be able to measure the ambiguity function output from a power amplifier in the optimization process. This paper describes a technique that can be used to quickly calculate the ambiguity function for the output waveform from the radar amplifier as measured on an oscilloscope. Brief examination is also given to the effect of amplifier nonlinearity on the ambiguity function. © 2013 IEEE.

关键词： Transmitters

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Radar waveform optimization to minimize spectral spreading and achieve target detection

Radar waveform optimization to minimize spectral spreading a...

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2013 IEEE Texas Symposium on Wireless and Microwave circuits and systems, WMCS 2013

ISBN: (纸本)9781479904556

Spectral spreading in radar systems is a concern that is related to the radar waveform. This paper describes a procedure to optimize a linear frequency-modulated chirp waveform for a desired ambiguity function while meeting spectral requirements. The minimax approach used for the optimization is described, and some example results for the optimization are presented. The integration of bench-top spectrum analyzer measurements into the optimization is presented, and the way forward in terms of measurement-based optimization is discussed. © 2013 IEEE.

关键词： Optimization

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Radar power amplifier circuit and waveform optimization for spectrally confined, reconfigurable radar systems

Radar power amplifier circuit and waveform optimization for ...

引用

2013 IEEE Radar Conference: "The Arctic - The New Frontier", RadarCon 2013

作者： Baylis, Charles Martin, Josh Fellows, Matthew Moon, David Moldovan, Matt Cohen, Lawrence Marks, Robert J. Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX United States Naval Research Laboratory Radar Division Washington DC United States

ISBN: (纸本)9781467357920

Increasingly stringent spectral spreading constraints are motivating a paradigm shift in the spectrum engineering of radar systems. Future spectrum requirements will likely dictate narrower spectral masks that will change based on geography. The desire to operate radar systems efficiently with waveforms that will provide desired detection capabilities must mesh with the need to meet spectral mask criteria. To this end, a collaborative research effort between Baylor University and the U.S. Naval Research laboratory has resulted in the design of reconfigurable circuit and waveform approaches to optimize spectral confinement, power efficiency, and detection capabilities. This paper surveys the joint optimization approach and describes innovations by the authors in circuit and waveform reconfiguration that will be useful in future flexible radar transmitters. © 2013 IEEE.

关键词： Research laboratories

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New Blind Multiuser Detection in DS-CDMA Using H-DE and ICA Algorithms

New Blind Multiuser Detection in DS-CDMA Using H-DE and ICA ...

引用

International Conference on Intelligent systems, Modelling and Simulation (ISMS)

作者： Zaid Albataineh Fathi Salem Circuits Systems and Neural Networks Laboratory Department of Electrical and Computer Engineering Michigan State University East Lansing MI USA

Hyper Differential Evolution (H-DE)is a new optimization technique. We develop a novel blind Detection algorithm based on H-DE in conjunction with Independent Component Analysis (ICA). We then apply the algorithm to the multi-user symbol estimation problem in Direct Sequence Code Division Multiple Access (DS-CDMA) systems. Blind detection is to estimate multiple symbol sequences associated with all users in the downlink of the DS-CDMA communication system using only the received wireless data and without any knowledge of the user spreading codes. Bit error rate (BER) simulation evidence of the improved performance of this novel algorithm are shown for different number of users, signal to noise ratio (SNR) and different number of symbols per user. The performance is compared with the traditional FAST ICA Detector. The results show that the proposed algorithm performs well and outperforms the FAST ICA Detector in estimating the symbol signals from the mixed CDMA received signals.

关键词： Multiaccess communication Vectors Signal to noise ratio Bit error rate Detectors Covariance matrices Independent component analysis

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New Blind Multiuser Detection in DS-CDMA Based on Extension of Efficient Fast Independent Component Analysis (EF-ICA)

New Blind Multiuser Detection in DS-CDMA Based on Extension ...

引用

International Conference on Intelligent systems, Modelling and Simulation (ISMS)

作者： Zaid Albataineh Fathi Salem Circuits Systems and Neural Networks Laboratory Department of Electrical and Computer Engineering Michigan State University East Lansing MI USA

This Paper develops a novel blind Detection algorithm based on Extension of Efficient FAST Independent Component Analysis (EF-ICA). classifying the received data to many parts in order to use a fit non-quadratic function to separate a non-Gaussian source. Blind detection is to estimate multiple symbol sequences associated with all users in the downlink of the DS-CDMA communication system using only the received wireless data and without any knowledge of the user spreading codes. Bit error rate (BER) simulation evidence of the improved performance of this novel algorithm are shown for different number of users, signal to noise ratio (SNR) and different number of symbols per user. The performance is compared with several Blind Detectors based on Efficient FastICA and Fast ICA algorithms. The results show that the proposed algorithm performs well and outperforms the other Detectors in estimating the symbol signals from the mixed CDMA received signals.

关键词： Signal to noise ratio Bit error rate Multiaccess communication Algorithm design and analysis Detectors Vectors Independent component analysis

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Radar Power Amplifier Circuit and Waveform Optimization for Spectrally Confined, Reconfigurable Radar systems

Radar Power Amplifier Circuit and Waveform Optimization for ...

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IEEE Radar Conference

作者： Charles Baylis Josh Martin Matthew Fellows David Moon Matt Moldovan Lawrence Cohen Robert J. Marks Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Naval Research Laboratory Radar Division

ISBN: (纸本)9781467357920

关键词： Radar systems waveforms detection capability configurability laboratory Research spectrum requirement Power amplifiers Technological Innovations Radar transmitters

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New Blind Multiuser Detection DS-CDMA Algorithm Using Simplified Fourth Order Cumulant Matrices

New Blind Multiuser Detection DS-CDMA Algorithm Using Simpli...

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IEEE International Symposium on circuits and systems

作者： Zaid Albataineh Fathi Salem Circuits Systems And Neural Networks (CSANN) Laboratory Department of Electrical and Computer Engineering Michigan State University East Lansing Michigan 48824-1226 U.S.A.

ISBN: (纸本)9781467357609

A new blind Detection algorithm based on simplified fourth order cumulant matrices is presented and applied to the multi-user symbol estimation problem in Direct Sequence Code Division Multiple Access (DS-CDMA) systems. The blind detection is to estimate multiple symbol sequences associated with all users in the downlink of DS-CDMA communication system using only the received wireless data and without any knowledge of the user spreading codes. The proposed algorithm takes advantage of higher cumulant matrix properties to reduce computational load and enhance performance. Bit error rate (BER) simulations of this algorithm are shown for different number of users, signal to noise ratio (SNR) and different number of symbols per user in comparison with the FAST ICA algorithm and Robust ICA. The results show that the proposed algorithm outperforms the both ICA-Detectors in estimating the symbol signals from the mixed CDMA received signals.

关键词： DS-CDMA BER SNR Direct-sequence code-division multiple access signal to noise ratios Bit error rate Supernova remnants Consumers Ziziphus mauritiana wireless data Blind Detection algorithms

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Calculation of the radar ambiguity function from time-domain measurement data for real-time, amplifier-in-the-loop waveform optimization

Calculation of the radar ambiguity function from time-domain...

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ARFTG Conference

作者： Matthew Fellows Charles Baylis Lawrence Cohen Robert J. Marks Department of Electrical and Computer Engineering Baylor University Wireless and Microwave Circuits and Systems Program Waco TX USA Naval Research Laboratory Radar Division Washington DC USA

关键词： Chirp Optimization Radar detection Radar measurements Doppler radar Distortion measurement

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Radar waveform optimization to minimize spectral spreading and achieve target detection

Radar waveform optimization to minimize spectral spreading a...

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Texas Symposium on Wireless and Microwave circuits and systems, (WMCS)

作者： Matthew Fellows Charles Baylis Lawrence Cohen Robert J. Marks Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX USA Radar Division Naval Research Laboratory Washington DC DC USA

关键词： Chirp Optimization Doppler effect Radar detection Frequency modulation Time-frequency analysis

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Radar chirp waveform selection and circuit optimization using ACPR load-pull measurements

Radar chirp waveform selection and circuit optimization usin...

引用

2012 IEEE 13th Annual Wireless and Microwave Technology Conference, WAMICON 2012

作者： Martin, Josh Moldovan, Matthew Baylis, Charles Marks II, Robert J. Cohen, Lawrence De Graaf, Jean Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX United States U.S. Naval Research Laboratory Radar Division Washington DC United States

ISBN: (纸本)9781467301299

Due to tightening spectral criteria, joint optimization of radar transmitter waveform and circuit is considered to minimize the nonlinearity and waveform induced spectral spreading of radar transmitters. This work demonstrates the ACPR load-pull measurement of a power amplifier under excitation from two chirp waveforms. The results are compared to allow selection of the optimum chirp and transmitter load impedance. This work represents a beginning effort toward the real-time, computationally intelligent transmitter optimization in future reconfigurable radar systems. © 2012 IEEE.

关键词： Power amplifiers

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