Publications  

B. Beck, S. Lanh, R.J. Baxley & X. Ma, "Uncooperative Emitter Localization Using Signal Strength in Uncalibrarted Mobile Networks," in IEEE Transactions on Wireless Communications, November 2017.

K. Ying, H. Qian, R.J. Baxley & G.T. Zhou, "MIMO Transceiver Design in Dynamic-Range-Limited VLC Systems," in IEEE Photonics Technology Letters, November 2016.

B.M. Beck, R.J. Baxley & X. Ma, "Ultra-Wideband Tomographic Imaging in Uncalibrated Networks," in IEEE Transactions on Wireless Communications, June 2016.

S. Lee, R.J. Baxley, M.A. Weitnauer & B.T. Walkenhorst, "Achieving Undetectable Communication," in IEEE Journal of Selected Topics in Signal Processing, October 2015.

K. Ying, H. Qian, R.J. Baxley & S. Yao, "Joint Optimization of Precoder and Equalizer in MIMO VLC Systems," in IEEE Journal on Selected Areas in Communications, October 2015.

K. Ying, Z. Yu, R.J. Baxley, H. Qian, G.K. Chang & G.T. Zhou, "Nonlinear distortion mitigation in visible light communicaitons," in IEEE Wireless Communications Magazine, April 2015.

K. Ying, Z. Yu, R.J. Baxley & G.T. Zhou, "Optimization of Signal-to-Noise-plus-Distortion Ratio for Dynamic-Range-Limited Nonlinearities," in Digital Signal Processing, October 2014.

B.R. Hamilton, X. Ma, R.J. Baxley & S.M. Matechik, "Propagation Modeling for Radio Frequency Tomography in Wireless Networks," in IEEE Journal of Selected Topics in Signal Processing, December 2013.

Z. Yu, R.J. Baxley & G.T. Zhou, "EVM and Achievable Data Rate Analysis of Clipped OFDM Signals in Visible Light Communication," in EURASIP Journal of Wireless Communication and Networking, October 2012.

B.R. Hamilton, X. Ma, J.E. Kleider & R.J. Baxley, "OFDM Pilot Design for Channel Estimation with Null Edge Subcarriers," in IEEE Transactions on Wireless Communications, October 2011.

Q. Liu, R.J. Baxley, X. Ma & G.T. Zhou, "Diversity-enabled and power-efficient transceiver designs for peak-power-limited SIMO-OFDM systems," in EURASIP Journal on Advances in Signal Processing, January 2010.

Q. Liu, R.J. Baxley, X. Ma & G.T. Zhou, "Error vector magnitude optimization for OFDM systems with a deterministic peak-to-average power ratio constraint," in IEEE Journal of Selected Topics in Signal Processing, June 2009.

R.J. Baxley, J.E. Kleider & G.T. Zhou, "Pilot design for OFDM with null edge subcarriers," in IEEE Transactions on Wireless Communications, January 2009.

C. Zhao, R.J. Baxley & G.T. Zhou, "Peak-to-average power ratio and power efficiency considerations in MIMO-OFDM systems," in IEEE Communications Letters, April 2008.

R.J. Baxley & G.T. Zhou, "Comparing selected mapping and partial transmit sequence for PAR reduction," in IEEE Transactions on Broadcasting, December 2007.

R.J. Baxley, C. Zhao & G.T. Zhou, "Constrained clipping for crest factor reduction in OFDM," in IEEE Transactions on Consumer Electronics, December 2006.

R.J. Baxley & G.T. Zhou, "MAP metric for blind phase sequence detection in selected mapping," in IEEE Transactions on Broadcasting, December 2005.

R.J. Baxley & G.T. Zhou, "Power savings analysis of peak-to-average power ratio in OFDM," in IEEE Transactions on Consumer Electronics, August 2004.

R.J. Baxley & R.S.Thompson, "Team Zylinium DARPA Spectrum Collaboration Challenge Radio Design and Implementation," in Proc. IEEE International Symposium on Dynamic Spectrum Access Networks, Newark, NJ, November 2019.

B.M. Beck, R.J. Baxley & X. Ma, "Uncooperative RSS-Based Emitter Localization in Uncalibrated Mobile Networks," in Proc. IEEE International Workshop on Signal Processing Advances in Wireless Communications, Edinburgh, UK, July 2016.

K. Ying, Z. Yu, R.J. Baxley & G.T. Zhou, "Constrained clipping for PAPR reduction in VLC systems with dimming control," in Proc. IEEE Global Conference on Signal & Information Processing, Orlando, FL, December 2015.

J. Krier, M. Norko, A. Lanterman, J. Reed, R.J. Baxley, X. Ma & J. Barry, "Performance Bounds for an OFDM-Based Joint Radar and Communications System," in Proc. IEEE Military Communications Conference, Tampa, FL, October 2015.

Z. Yu, K. Ying, R.J. Baxley & G.T. Zhou, "PAPR reduction for bit-loaded OFDM in visible light communications," in Proc. IEEE Wireless Communications and Networking Conference, New Orleans, LA, March 2015.

K.L Tokuda, J.H. Kim, R.J. Baxley, J.S. Kenney & L.S. Cohen, "Receiver Cancellation of Radar in Radio," in Proc. IEEE Radio and Wireless Symposium, San Diego, CA, January 2015.

A.D. Harper & R.J. Baxley, "Asymptotic MIMO Artificial-Noise Secrecy Rates with Eigenmode Partitioning," in Proc. IEEE Global Conference on Signal and Information Processing, Atlanta, GA, December 2014.

Z. Yu, R.J. Baxley & G.T. Zhou, "Impulses Injection for PAPR Reduction in Visible Light OFDM Communications," in Proc. IEEE Global Conference on Signal and Information Processing, Atlanta, GA, December 2014.

Z. Yu, R.J. Baxley & G.T. Zhou, "Iterative Clipping for PAPR Reduction in Visible Light OFDM Communications," in Proc. IEEE Military Communications Conference, Baltimore, MD, October 2014.

B.M. Beck, R.J. Baxley & J.H. Kim, "Real-Time, Anchor-Free Node Tracking Using Ultrawideband Range and Odometry Data," in Proc. IEEE International Conference on Ultra-Wideband, Paris, France, September 2014.

S. Lee & R.J. Baxley, "Achieving Positive Rate With Undetectable Communication Over AWGN and Rayleigh Channels," in Proc. IEEE International Conference on Communications, Sydney, Australia, June 2014.

S. Lee, R.J. Baxley, J.B. McMahon & S.R. Frazier, "Achieving Positive Rate With Undetectable Communication Over MIMO Rayleigh Channels," in Proc. IEEE Sensor Array and Multichannel Signal Processing Workshop, Coruna, Spain, June 2014.

B.M. Beck & R.J. Baxley, "Anchor Free Node Tracking Using Ranges, Odometry, and Multidimensional Scaling," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Florence, Italy, May 2014.

Z. Yu, R.J. Baxley & G.T. Zhou, "Distributions of Upper PAPR and Lower PAPR of OFDM Signals in Visible Light Communications," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Florence, Italy, May 2014.

Z. Yu, R.J. Baxley & G.T. Zhou, "Brightness Control in Dynamic Range Constrained Visible Light OFDM Systems," in Proc. IEEE Wireless and Optical Communication Conference, Newark, New Jersey, May 2014.

B.M. Beck, R.J. Baxley & X. Ma, "Regularization Techniques for Floor Plan Estimation in Radio Tomographic Imaging," in Proc. IEEE Global Conference on Signal and Information Processing, Austin, TX, December 2013.

Z. Yu, R.J. Baxley & G.T. Zhou, "Dynamic Range Constrained Clipping in Visible Light OFDM Systems with Brightness Control," in Proc. IEEE Globecom Conference, Atlanta, GA, December 2013.

Z. Yu, R.J. Baxley & G.T. Zhou, "Peak-to-Average Power Ratio and Illumination-to-Communication Efficiency Considerations in Visible Light OFDM Systems," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Vancouver, CA, May 2013.

Z. Yu, R.J. Baxley & G.T. Zhou, "Multi-User MISO Broadcasting for Indoor Visible Light Communication," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Vancouver, CA, May 2013.

B.M. Beck, J.H. Kim, R.J. Baxley & B.T. Walkenhorst, "RadioBOT: Spatial Cognitive Radio Testbed," in Proc. IEEE Aerospace Conference, Big Sky, MT, March 2013.

Z. Yu, R.J. Baxley & G.T. Zhou, "Achievable Data Rate Analysis of Clipped Flip-OFDM in Optical Wireless Communication," in Proc. IEEE Global Telecommunications Conference Workshop on Optical Wireless Communications, Anaheim, CA, December 2012.

B.M. Beck, R.J. Baxley & X. Ma, "Improving Radio Tomography Images Using Multipath Signals," in Proc. IEEE International Conference on Wireless Information Technology and Systems, Maui, HI, November 2012.

B.T. Walkenhorst, A.D. Harper & R.J. Baxley, "Channel model and sounding method effects on wireless secret key rates," in Proc. IEEE Technologies for Homeland Security, Waltham, MA, November 2012.

B.R. Hamilton, X. Ma, R.J. Baxley & S.M. Matechik, "Radio frequency tomography in mobile networks," in Proc. IEEE Statistical Signal Processing Workshop, Ann Arbor, MI, July 2012.

Z. Yu, R.J. Baxley & G.T. Zhou, "On the EVM calculation of clipped optical OFDM signals," in Proc. IEEE Photonics Society Summer Topical Meeting Series, Seattle, WA, July 2012.

Z. Yu, R.J. Baxley & G.T. Zhou, "Time-domain impulse injection method for crest factor reduction of OFDM signals," in Proc. IEEE Statistical Signal Processing Workshop, Ann Arbor, MI, July 2012.

B.R. Hamilton, X. Ma & R.J. Baxley, "Efficient node self-localization in large ad-hoc wireless networks using interlaced particle filters," in Proc. IEEE Military Communications Conference, Baltimore, MD, November 2011.

T.G. Pratt, H. Tapse, R.J. Baxley, B.T. Walkenhorst & G. Acosta-Marum, "Polarization-based zero forcing with channel estimation," in Proc. IEEE Military Communications Conference, Baltimore, MD, November 2011.

T.G. Pratt, H. Tapse, B. Fette, R.J. Baxley, B.T. Walkenhorst & G. Acosta-Marum, "Polarization-based zero forcing suppression with multiple degrees of freedom," in Proc. IEEE Military Communications Conference, Baltimore, MD, November 2011.

B.R. Hamilton, X. Ma & R.J. Baxley, "SAL: Shadowing assisted localization," in Proc. IEEE Statistical Signal Processing Workshop, Nice, France, June 2011.

Z. Yu, R.J. Baxley & G.T. Zhou, "Generalized interior-point method for constrained peak power minimization of OFDM signals," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Prague, Czech Republic, May 2011.

R.J. Baxley, B.T. Walkenhorst & G. Acosta-Marum, "Complex Gaussian Ratio Distribution with Applications for Error Rate Calculation in Fading Channels with Imperfect CSI," in Proc. IEEE Global Telecommunications Conference, Miami, FL, December 2010.

A.D. Harper & R.J. Baxley, "Link Probability for Ad Hoc Mesh Networks in the Presence of Multiple Interferers," in Proc. IEEE Military Communications Conference, San Jose, CA, October 2010.

B.R. Hamilton, X. Ma, R.J. Baxley & B.T. Walkenhorst, "Node localization and tracking using distance and acceleration measurements," in Proc. International Workshop on Cognitive Information Processing, Elba, Italy, June 2010.

G. Acosta-Marum, B.T. Walkenhorst & R.J. Baxley, "An Empirical Doubly-Selective Dual-Polarization Vehicular MIMO Channel Model," in Proc. IEEE Vehicular Technology Conference, Taipei, Taiwan, May 2010.

Q. Liu, R.J. Baxley, X. Ma & G.T. Zhou, "Optimizing free subcarrier index to minimize peak-to-average power ratio for OFDM systems," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Dallas, Texas, April 2010.

R.J. Baxley & B.T. Walkenhorst, "Nonlinear spreading for communications in co-band interference channels," in Proc. Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, November 2009.

Q. Liu, R.J. Baxley & G.T. Zhou, "Optimal subcarrier power allocation for OFDM in peak-power-limited channels," in Proc. Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, November 2009.

Q. Liu, R.J. Baxley, X. Ma & G.T. Zhou, "Peak reduction for multiplexed asynchronous OFDM-FDMA," in Proc. IEEE Military Communications Conference, Boston, MA, October 2009.

R.J. Baxley, B.T. Walkenhorst & G.T. Zhou, "Signal classification using a peak-to-average power ratio statistic," in Proc. IEEE International Conference on Communications, Dresden, Germany, June 2009.

R.J. Baxley & G.T. Zhou, "Receiver nonlinearity optimization in clipping channels," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Taipei, Taiwan, April 2009.

Q. Liu, R.J. Baxley, X. Ma & G.T. Zhou, "On the PTS method and BER-minimizing power allocation of the multi-channeL OFDM system," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Taipei, Taiwan, April 2009.

J.E. Kleider, X. Ma, R.J. Baxley & G.T. Zhou, "MISO joint synchronization-pilot design for OFDM systems," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Las Vegas, NV, March 2008.

Q. Liu, R.J. Baxley & G.T. Zhou, "Free subcarrier optimization for peak-to-average power ratio minimization in OFDM systems," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Las Vegas, NV, March 2008.

Q. Liu, R.J. Baxley, X. Ma & G.T. Zhou, "Error vector magnitude optimization for OFDM systems with deterministic constraint on the peak-to-average power ratio," in Proc. IEEE Conference on Information Sciences and Systems, Princeton, NJ, March 2008.

R.J. Baxley & G.T. Zhou, "SNDR Considerations for the Minimum Clipping Power Loss Scheme," in Proc. IEEE Military Communications Conference, Orlando, FL, October 2007.

R.J. Baxley, J.E. Kleider & G.T. Zhou, "A method for joint peak-to-average power ratio reduction and synchronization in OFDM," in Proc. IEEE Military Communications Conference, Orlando, FL, October 2007.

R.J. Baxley & G.T. Zhou, "A comparison of SNDR maximization techniques for OFDM," in Proc. Proc. IEEE Workshop on Statistical Signal Processing, Madison, WI, August 2007.

C. Zhao, R.J. Baxley & G.T. Zhou, "SNDR Analysis for Transceiver Nonlinearities in AWGN Channels," in Proc. IEEE Workshop on Statistical Signal Processing, Madison, WI, August 2007.

R.J. Baxley, J.E. Kleider & G.T. Zhou, "Pilot design for IEEE 802.16 OFDM and OFDMA," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Honolulu, Hawaii, April 2007.

R.J. Baxley, C. Zhao & G.T. Zhou, "Magnitude-scaled selected mapping: A crest factor reduction scheme for OFDM without side-information transmission," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Honolulu, Hawaii, April 2007.

C. Zhao, R.J. Baxley, G.T. Zhou, D. Boppana & J.S. Kenney, "Constrained clipping for crest factor reduction in multiple-user OFDM," in Proc. IEEE Radio and Wireless Symposium, Long Beach, CA, January 2007.

R.J. Baxley & G.T. Zhou, "Comparison of selected mapping and partial transmit sequence for crest factor reduction in OFDM," in Proc. IEEE Military Communications Conference, Washington, D.C., October 2006.

X. Ma, R.J. Baxley, J.E. Kleider & G.T. Zhou, "Superimposed training for channel shortening equalization in OFDM," in Proc. IEEE Military Communications Conference, Washington, D.C., October 2006.

C. Zhao & R.J. Baxley, "Error vector magnitude analysis for OFDM systems," in Proc. Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, October 2006.

R.J. Baxley & G.T. Zhou, "Computational Complexity Analysis of FFT Pruning-A Markov Modeling Approach," in Proc. IEEE Digital Signal Processing Workshop, Grand Teton, WY, September 2006.

R.J. Baxley & J.E. Kleider, "Embedded synchronization/pilot sequence creation using POCS," in Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, Toulouse, France, May 2006.

R.J. Baxley & G.T. Zhou, "Ordered phase sequence testing in SLM for improved blind detection," in Proc. IEEE Workshop on Signal Processing Advances in Wireless Communications, New York City, NY, June 2005.

R.J. Baxley & G.T. Zhou, "Assessing peak-to-average power ratios for communications applications," in Proc. IEEE Military Communications Conference, Monterey, CA, October 2004.

G.T. Zhou, R.J. Baxley & N. Chen, "Selected mapping with monomial phase rotations for peak-to-average power ratio reduction in OFDM," in Proc. IEEE International Conference on Communications, Circuits and Systems, Chengdu, China, June 2004.

R.J. Baxley, S. Szilvasi, L. Harwood, R.S. Thompson, S.B. Seeber & C. Sepulveda, "Localization Calibration and Refinement in High-Speed Mobile Wireless Systems", United States Patent No. 10,705,178, July 2020.

R.J. Baxley, S. Szilvasi, L. Harwood, R.S. Thompson, S.B. Seeber & C. Sepulveda, "User equipment identification from mobile high-speed wireless uplink channels", United States Patent No. 10,567,948, February 2020.

R.J. Baxley, S. Szilvasi, L. Harwood, R.S. Thompson, S.B. Seeber & C. Sepulveda, "Localization of mobile high-speed wireless user equipment from downlink channels", United States Patent No. 10,564,251, February 2020.

R.J. Baxley, S. Szilvasi, L. Harwood, R.S. Thompson, S.B. Seeber & C. Sepulveda, "Localization of mobile high-speed wireless user equipment from uplink channels", United States Patent No. 10,473,749, November 2019.

R.J. Baxley, D. Maynor, C.J. Rouland & M.T. Engle, "Sensor Mesh and Signal Transmission Architectures for Electromagnetic Signature Analysis", United States Patent No. 10,338,191, July 2019.

R.J. Baxley & C.J. Rouland, "Ground and Air Vehicle Electromegnetic Signature Detection and Localization", United States Patent No. 10,122,736, November 2018.

R.J. Baxley & C.J. Rouland, "Electromagnetic Threat Detection and Mitigation in the Internet of Things", United States Patent No. 10,104,098, October 2018.

R.J. Baxley, C.J. Rouland & M.T. Engle, "Diverse radio frequency signature, video, and image sensing for detection and localization", United States Patent No. 9,880,256, October 2018.

R.J. Baxley, T. Dinh, C.J. Rouland & M.T. Engle, "Computational Signal Processing Architectures for Electromagnetic Signature Analysis", United States Patent No. 9,945,928, January 2018.

R.J. Baxley, D. Maynor, C.J. Rouland & M.T. Engle, "Electromagnetic Signature Analysis for Threat Detection in a Wireless Environment of Embedded Computing Devices", United States Patent No. 9,739,868, August 2017.

R.J. Baxley, D. Maynor & L.M. Lamb, "Cross-Modality Electromagnetic Signature Analysis for Radio Frequency Persona Identification", United States Patent No. 9,560,060, January 2017.

R.J. Baxley & J.T. Altman, "Efficient localization of transmitters within complex electromagnetic environments", United States Patent No. 9,551,781, January 2017.

R.J. Baxley, C.J. Rouland & M.T. Engle, "Anomalous Behavior Detection Using Radio Frequency Fingerprints and Access Credentials", United States Patent No. 9,485,267, November 2016.

R.J. Baxley, C.J. Rouland & M.T. Engle, "Security Measures Based on Signal Strengths of Radio Frequency Signals", United States Patent No. 9,485,266, November 2016.

R.J. Baxley, D. Maynor, C.J. Rouland & M.T. Engle, "Blind Signal Classification and Demodulation in a Multimodal Radio Frequency Environment", United States Patent No. 9,625,564, March 2015.

R.J. Baxley, C.J. Rouland & M.T. Engle, "Anomalous Behavior Detection Based on Behavioral Signatures", United States Patent No. 9,736,175, March 2015.

R.J. Baxley, C.J. Rouland & M.T. Engle, "Electromagnetic Persona Generation Based on Radio Frequency Fingerprints", United States Patent No. 9,635,044, January 2015.

R.J. Baxley, C.J. Rouland & M.T. Engle, "Radio Frequency Fingerprint Detection", United States Patent No. 9,591,013, January 2015.

R.J. Baxley & J.E. Kleider, "Methods and apparatus for generating synchronization/pilot sequences for embedding in wireless signals", United States Patent No. 8,358,644, January 2013.

J.E. Kleider & R.J. Baxley, "Methods and apparatus for wirelessly communicating signals that include embedded synchronization/pilot sequences", United States Patent No. 8,331,863, December 2012.

J.E. Kleider & R.J. Baxley, "Methods and apparatus for wirelessly communicating signals that include embedded synchronization/pilot sequences", United States Patent No. 8,131,218, March 2012.

R.J. Baxley, J.E. Kleider & K. Anderson, "Methods and apparatus for generating and communicating wireless signals having pilot signals with variable pilot signal parameters", United States Patent No. 8,098,713, January 2012.

C. Zhao, R.J. Baxley & G.T. Zhou, "Constrained clipping for peak-to-average power ratio (crest factor) reduction in multicarrier transmission systems", United States Patent No. 7,944,991, January 2011.

R.J. Baxley & G.T. Zhou, Peak-to-Average Power Ratio Reduction, in Digital Signal Processing Handbook, 2nd Edition, Vijay Madisetti, Ed., CRC Press, ISBN: 1420046047, November 2009.

C. Zhao, R.J. Baxley & G.T. Zhou, Peak-to-average power ratio and power efficiency considerations in MIMO-OFDM systems, in Advances in Military Mobile Communications and Networking, J. W. Gowens II, Ed., IEEE Computer Society, ISBN: 978-0769537306, January 2009.

Q. Liu, R.J. Baxley, X. Ma & G.T. Zhou, Error Vector Magnitude Optimization for OFDM Systems with a Deterministic Peak-to-Average Power Ratio Constraint, in Advances in Military Mobile Communications and Networking, J. W. Gowens II, Ed., IEEE Computer Society, ISBN: 978-0769537306, January 2009.

R.J. Baxley, J.E. Kleider & G.T. Zhou, Pilot design for IEEE 802.16 OFDM and OFDMA, in Advances in Military Mobile Communications and Networking, J. W. Gowens II, Ed., IEEE Computer Society, ISBN: 978-0769537306, January 2009.

R.J. Baxley, OFDM communications over peak-limited channels, Ph.D. thesis, Georgia Institute of Technology, August 2008.

R.J. Baxley, Analyzing selected mapping for peak-to-average power reduction in OFDM, M.S. thesis, Georgia Institute of Technology, May 2005.