Full Publication List

Not updated lately. Please go to Google Scholar for my most udpated publication information.

Preprint

  1. X. Fu, W.-K. Ma, J. M. Bioucas-Dias, and T.-H. Chan, "Semiblind hyperspectral unmixing in the presence of spectral library mismatches," arXiv preprint arXiv:1507.01661, 2015. [ArXiv]

Accepted Papers
  1. X. Fu, N. D. Sidiropoulos, J. Tranter, and W.-K. Ma, "A factor analysis framework for power spectra separation and multiple emitter localization," to appear in  IEEE Transactions on Signal Processing, accepted 2015.
  2. X. Fu, K. Huang, W.-K. Ma, N. D. Sidiropoulos, and R. Bro, "Joint tensor factorization and outlying slab suppression with applications," to appear in  IEEE Transactions on Signal Processing, accepted 2015.

Book Chapters
  1. W.-K. Ma, T.-H. Chan, C.-Y. Chi, and Y. Wang, "Convex analysis for non-negative blind source separation with application in imaging," in Convex Optimization in Signal Processing and Communications, Chapter 7, D. P. Palomar, Y. Eldar, Eds., 2010.

Published Journal Papers
  1. C.-H. Lin, W.-K. Ma, W.-C. Li, C.-Y. Chi, and A. Ambikapathi, "Identifiability of the simplex volume minimization criterion for blind hyperspectral unmixing: The no pure-pixel case," IEEE Transactions on Geoscience and Remote Sensing, vol. 53, no. 10, pp. 5530-5546, Oct. 2015. [ArXiv]
  2. X. Fu, W.-K. Ma, T.-H. Chan, and J. M. Bioucas-Dias, "Self-dictionary sparse regression for hyperspectral unmixing: Greedy pursuit and pure pixel search are related," IEEE Journal of Selected Topics in Signal Processing, vol. 9, no. 6, pp. 1128-1141, Oct. 2015. [ArXiv] [MATLAB code]
  3. W. Xu, Q. Li, A. M.-C. So, and W.-K. Ma, "Rank-two beamforming and stochastic beamforming for MISO physical-layer multicasting with finite-alphabet inputs," IEEE Signal Processing Letters, vol. 22, no. 10, pp. 1614-1618, Oct. 2015.
  4. N. Gillis and W.-K. Ma, "Enhancing pure-pixel identification performance via preconditioning," SIAM Journal on Imaging Sciences, vol. 8, no. 2, pp. 1161-1186, 2015. [ArXiv]
  5. X. Fu, W.-K. Ma, K. Huang, and N. D. Sidiropoulos, "Blind separation of quasi-stationary sources: Exploiting convex geometry in covariance domain," IEEE Transactions on Signal Processing, vol. 63, no. 9, pp. 2306-2320, May 2015.  [PDF] [MATLAB code]
  6. Q. Li, Y. Yang, W.-K. Ma, M. Lin, J. Ge, and J. Lin, "Robust cooperative beamforming and artificial noise design for physical-layer secrecy in AF multi-antenna multi-relay networks," IEEE Transactions on Signal Processing, vol. 63, no. 1, pp. 206-220, Jan 2015.
  7. K.-Y. Wang, A. M.-C. So, T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "Outage constrained robust transmit optimization for multiuser MISO downlinks: Tractable approximations by conic optimization," IEEE Transactions on Signal Processing, vol. 62, no. 21, pp. 5690-5705, Nov. 2014. [PDF] [Companion Technical Report]
  8. J. Pan and W.-K. Ma, "Constant envelope precoding for single-user large-scale MISO channels: Efficient precoding and optimal designs," IEEE Journal of Selected Topics in Signal Processing, vol. 8, no. 5, pp. 982-995, Oct. 2014.
  9. J. Pan, W.-K. Ma, and J. Jaldén, "MIMO detection by Lagrangian dual maximum-likelihood relaxation: Reinterpreting regularized lattice decoding," IEEE Transactions on Signal Processing, vol. 62, no. 2, pp. 511-524, Jan 2014. [PDF]
  10. W.-K. Ma, J. M. Bioucas-Dias, T.-H. Chan, N. Gillis, P. Gader, A. Plaza, A. Ambikapathi and C.-Y. Chi, "A signal processing perspective on hyperspectral unmixing," IEEE Signal Processing Magazine, Special Issue on Signal and Image Processing in Hyperspectral Remote Sensing, vol. 31, no. 1, pp. 67-81, Jan 2014.  [PDF]
  11. Q. Li, W.-K. Ma, and A. M.-C. So, "A safe approximation approach to secrecy outage design for MIMO wiretap channels," IEEE Signal Processing Letters, vol. 21, no. 1, pp. 118-121, Jan 2014.
  12. K. K. Lee, W.-K. Ma, X. Fu, T.-H. Chan, and C.-Y. Chi, "A Khatri-Rao subspace approach to blind identification of mixtures of quasi-stationary sources," Signal Processing, vol. 93, no. 12, pp. 3515-3527, Dec 2013 (special issue in memory of Alex B. Gershman).
  13. Q. Li, M. Hong, H.-T. Wai, Y.-F. Liu, W.-K. Ma, and Z.-Q. Luo, "Transmit solutions for MIMO wiretap channels using alternating optimization," IEEE Journal on Selected Areas in Communications, vol. 31, no. 9, pp. 1714-1727, Sep 2013.
  14. X. Wu, W.-K. Ma, and A. M.-C. So, "Physical-layer multicasting by stochastic transmit beamforming and Alamouti space-time coding," IEEE Transactions on Signal Processing, vol. 61, no. 17, pp. 4230-4245, Sep 2013. Also available on [ArXiv]. See also the companion technical report [ArXiv].
  15. B. K. Chalise, W.-K. Ma, Y. D Zhang, H. A Suraweera, and M. G Amin, "Optimum performance boundaries of OSTBC based AF-MIMO relay system With energy harvesting receiver," IEEE Transactions on Signal Processing, vol. 61, no. 17, pp. 4199-4213, Sep 2013.
  16. T.-H. Chan, A. Ambikapathi, W.-K Ma, and C.-Y. Chi, "Robust affine set fitting and fast simplex volume max-min for hyperspectral endmember extraction," IEEE Transactions on Geoscience and Remote Sensing, vol. 51, no. 7, pp. 3982-3997, Jul 2013.
  17. Q. Li and W.-K. Ma, "Spatially selective artificial-noise aided transmit optimization for MISO multi-Eves secrecy rate maximization," IEEE Transactions on Signal Processing, vol. 61, no. 10, 2704-2717, May 2013.
  18. Y. Yang, Q. Li, W.-K. Ma, J. Ge, and P. C. Ching, "Cooperative secure beamforming for AF relay networks with multiple eavesdroppers," IEEE Signal Processing Letters, vol. 20, no. 1, pp. 35-38, Jan 2013.
  19. K. W.-K. Lui, H. C. So, W.-K. Ma, and F. K.-W. Chan, "A flexible semi-definite programming approach for source localization problems," Digital Signal Processing, vol. 23, 601-609, 2013.
  20. Y. Yang, T.-H. Chang, W.-K. Ma, J. Ge, C.-Y. Chi, and P. C. Ching, "Noncoherent bit-interleaved coded OSTBC-OFDM with maximum space-frequency diversity," IEEE Transactions on Wireless Communications, vol. 11, no. 9, pp. 3335-3347, Sep 2012.
  21. T.-H. Chang, W.-K. Ma, C.-Y. Huang, and C.-Y. Chi, "Noncoherent OSTBC-OFDM for MIMO and cooperative communications: Perfect channel identifiability and achievable diversity order," IEEE Trans. Signal Process., vol. 60, no. 9, pp. 4849-4863, Sep 2012.
  22. Y. Huang, Q. Li, W.-K. Ma, and S. Zhang, "Robust multicast beamforming for spectrum sharing-based cognitive radios," IEEE Trans. Signal Process., vol. 60, no. 1, pp. 527-533, Jan 2012.
  23. T.-H. Chan, W.-K. Ma, A. Ambikapathi, and C.-Y. Chi, "A simplex volume maximization framework for hyperspectral endmember extraction," IEEE Trans. Geoscience and Remote Sensing, vol. 49, no. 11, pp. 4194-4209, Nov 2011.
  24. A. Ambikapathi, T.-H. Chan, W.-K. Ma, and C.-Y. Chi, "Chance constrained robust minimum volume enclosing simplex algorithm for hyperspectral unmixing," IEEE Trans. Geoscience and Remote Sensing, vol. 49, no. 11, pp. 4177-4193, Nov 2011.
  25. F. Tian, W. Zhang, W.-K. Ma, P. C. Ching, and H. V. Poor, "An effective distributed space-time code for two-path successive relay network," IEEE Trans. Commun., vol. 59, no. 8, pp. 2254-2263, Aug 2011.
  26. Q. Li and W.-K. Ma, "Optimal and robust transmit designs for MISO channel secrecy by semidefinite programming," IEEE Trans. Signal Process., vol. 59, no. 8, pp. 3799-3812, Aug 2011.
    27.
  27. W.-C. Liao, T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "QoS-based transmit beamforming in the presence of eavesdroppers: An artificial-noise-aided approach," IEEE Trans. Signal Process., vol. 59, no. 3, pp. 1202-1216, Mar 2011.
  28. Z.-Q. Luo, W.-K. Ma, A. M.-C. So, Y. Ye, and S. Zhang, "Semidefinite relaxation of quadratic optimization problems: From its practical deployments and scope of applicability to key theoretical results," IEEE Signal Processing Magazine, vol. 27, no. 3, Special Issue on Convex Optimization for Signal Processing, pp. 20-34, May 2010.
  29. W.-K. Ma, T.-H. Hsieh, and C.-Y. Chi, "DOA estimation of quasi-stationary signals with less sensors than sources and unknown spatial noise covariance: A Khatri-Rao subspace approach," IEEE Trans. Signal Process., vol. 58, no. 4, pp. 2168-2180, April 2010.
  30. T.-H. Chang, C.-W. Hsin, W.-K. Ma, and C.-Y. Chi, "A linear fractional semidefinite relaxation approach to maximum-likelihood detection of higher order QAM OSTBC in unknown channels," IEEE Trans. Signal Process., vol. 58, no. 4, pp. 2316-2326, April 2010.  See also the companion technical report, and MATLAB demo codes.
  31. Z. Quan, W.-K. Ma, S. Cui, and A. Sayed, "Optimal linear fusion for distributed detection via semidefinite programming," IEEE Trans. Signal Process., vol. 58, no. 4, pp. 2432-2436, April 2010.
  32. F. Tian, X.-G. Xia, W.-K. Ma, and P. C. Ching, "On the full diversity property of a space-frequency code family with multiple carrier frequency offsets in cooperative communication systems," Journal of Communications, vol. 5, no. 4, pp. 317-331, Apr. 2010.
  33. K. W. K. Lui, H. C. So, and W.-K. Ma, "Maximum a posteriori approach to time-of-arrival-based localization in non-line-of-sight environment," IEEE Trans. Vehicular Tech., vol. 59, no. 3, pp. 1517-1523, Mar. 2010.
  34. W.-K. Ma, C.-C. Su, J. Jaldén, T.-H. Chang, and C.-Y. Chi, "The equivalence of semidefinite relaxation MIMO detectors for higher-order QAM," IEEE Journal of Selected Topics of Signal Processing, vol. 3, no. 6, pp. 1038-1052, Dec 2009. (This paper may read better with one column. Contact me if you want a one-column version.)
  35. T.-H. Chan, C.-Y. Chi, Y.-M. Huang, and W.-K. Ma, "A convex analysis based minimum-volume enclosing simplex algorithm for hyperspectral unmixing," IEEE Trans. Signal Process., vol. 57, no. 11, pp. 4418-4432, Nov 2009.
  36. F. Tian, X.-G. Xia, P. C. Ching, and W.-K. Ma, "Signal detection in a space-frequency coded cooperative communication system with multiple carrier frequency offsets by exploiting specific properties of the code structure," IEEE Trans. Vehicular Tech.,  vol. 58, no. 7, pp. 3396-3409, Sep. 2009.
  37. W. Ng, C. Ji, W.-K. Ma, and H. C. So, "A study on particle filters for single-tone frequency tracking," IEEE Trans. Aerospace and Electronic Systems, vol. 45, no. 3, pp. 1111?125, July 2009.
  38. S. A. Pasha, B.-N. Vo, H. D. Tuan, and W.-K. Ma, "A Gaussian mixture PHD filter for jump Markov system models," IEEE Trans. Aerospace and Electronic Systems, vol. 45, no. 3, pp. 919?36, July 2009.
  39. J.-K. Zhang and W.-K. Ma, "Full diversity blind Alamouti space-time block codes for unique identification of flat-fading channels," IEEE Trans. Signal Processing, vol. 57, no. 2, pp. 635-644, Feb 2009.
  40. Kenneth W. K. Lui, W.-K. Ma, H. C. So, and K. W. Chan, "Semi-definite programming algorithms for sensor network node localization with uncertainties in anchor positions and/or propagation speed," IEEE Trans. Signal Processing, vol. 57, no. 2, pp. 752-763, Feb 2009.
  41. K.W. Chan, H.C. So, and W.-K. Ma, "A novel subspace approach for cooperative localization in wireless sensor networks using range measurements," IEEE Trans. Signal Processing,  vol. 57, no. 1, pp. 260-269, Jan 2009.
  42. T.-H. Chan, W.-K. Ma, C-.Y. Chi, and Y. Wang, "A convex analysis framework for blind separation of non-negative sources," IEEE Trans. Signal Process., vol. 56, no. 10, pp. 5120-5134, Oct. 2008.
  43. C.-Y. Chi, C.-H. Peng, K.-C. Huang, T.-H. Tsai, and W.-K. Ma, "A block-by-block blind post-FFT multistage beamforming algorithm for multiuser OFDM systems based on subcarrier averaging," IEEE Trans. Wireless Commun., vol. 7, no. 8, pp. 3238-3251, Aug. 2008.
  44. T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "Maximum-likelihood detection of orthogonal space-time block coded OFDM in unknown block fading channels,"  IEEE Trans. Signal Processing, vol. 56, no. 4, pp. 1637-1649, Apr. 2008.
  45. J. Zheng, Kenneth W. K. Lui, W.-K. Ma, and H. C. So, "Two simplified recursive Gaussewton algorithms of a real sinusoid for direct amplitude and phase tracking," IEEE Signal Process. Lett., vol. 14, no. 12, pp. 972-975, Dec 2007.
  46. W.-K. Ma, "Blind ML detection of orthogonal space-time block codes: Identifiability and code construction," IEEE Trans. Signal Processing, vol. 55, no. 7, pp. 3312-3324, July 2007.
  47. B.-N. Vo and W.-K. Ma, "The Gaussian mixture probability hypothesis density filter," IEEE Transactions on Signal Processing, vol. 54, no. 11, 4091-4104, Nov. 2006.
  48. W.-K. Ma, B.-N. Vo, S. Singh, and A. Baddeley, "Tracking an unknown time-varying number of speakers using TDOA measurements: A random finite set approach," IEEE Transactions on Signal Processing, vol. 54, no. 9, 3291-3304, Sept. 2006.
  49. K. W. Cheung, H. C. So, W.-K. Ma, and Y. T. Chan, "A constrained least squares approach to mobile positioning: Algorithms and optimality," EURASIP Journal on Applied Signal Processing, vol. 2006, Article ID 20858, pp. 1-23, 2006.
  50. W.-K. Ma, B.-N. Vo, T.N. Davidson, and P.C. Ching, "Blind ML detection of orthogonal space-time block codes: High-performance, efficient implementations," IEEE Transactions on Signal Processing, vol. 54, no. 2, 738-751, Feb. 2006.
  51. H. C. So, W.-K. Ma, A. Farina, F. Gini, and W. Y. Tsui, "On four suboptimal quadratic detectors for random signals," IEICE Transactions on Communications, vol. E88-B, no. 12, 4527-4533, Dec. 2005.
  52. W.-K. Ma, P.C. Ching, and Z. Ding, "Semidefinite relaxation based multiuser detection for M-ary PSK multiuser systems," IEEE Transactions on Signal Processing, vol. 52, no. 10, 2862-2872, October 2004.
  53. W.-K. Ma, T.N. Davidson, K.M. Wong, and P.C. Ching, "A block alternating likelihood maximization approach to multiuser detection," IEEE Transactions on Signal Processing, vol. 52, no. 9, 2600-2611, September 2004.
  54. W.-K. Ma and P.C. Ching, "Crosstalk resilient interference cancellation in microphone arrays using Capon beamforming," IEEE Transactions on Speech and Audio Processing, vol. 12, no. 5, 468-477, September 2004.
  55. K.W. Cheung, H.C. So, W.-K. Ma, and Y.T. Chan, "Least squares algorithms for time-of-arrival based mobile location," IEEE Transactions on Signal Processing, vol. 52, no. 4, 1121-1128, April 2004
  56. W.-K. Ma and P.C. Ching, "Asymptotic minimum bit error rate property of maximum-likelihood multiuser detection," IEEE Communication Letters, vol. 7, no. 9, 425-427, September 2003
  57. W.-K. Ma, T.N. Davidson, K.M. Wong, Z.Q. Luo and P.C. Ching, "Quasi-maximum-likelihood multiuser detection using semi-definite relaxation with application to synchronous CDMA," IEEE Transactions on Signal Processing, vol. 50, no. 4, pp. 912-922, April 2002.
  58. H.C. So, W.-K. Ma, and Y.T. Chan, "Detection of random signals via spectrum matching," IEEE Transactions on Aerospace and Electronic Systems, vol. 38, no. 1, pp. 301-306, January 2002.
  59. W.-K. Ma, K.M. Wong, and P.C. Ching, "On computing Verdu's upper bound for a class of maximum-likelihood multiuser detection and sequence detection problems," IEEE Transactions on Information Theory, vol. 47, no. 7, pp. 3049-3053, 2001.
  60. W.-K. Ma and Y.T. Zhang, "Estimation of distortion product otoacoustic emissions," IEEE Transactions on Biomedical Engineering, vol. 46, no. 10, pp. 1261-1264, 1999.
  61. W.-K. Ma, Y.T. Zhang, and F.S. Yang, "A fast recursive-least-squares adaptive notch filter and its applications to biomedical signals," Medical and Biological Engineering and Computing, vol. 37, pp. 99-103, 1999.  

Conference Papers

  1. J. Pan, W.-K. Ma, X. Xia, and Y. Tian, "WMMSE-based multiuser MIMO beamforming: A practice-oriented design and LTE system performance evaluation," in Proc. SPAWC 2015, Stockholm, Sweden, Jun. 2015. [PDF]
  2. X. Wu, Q. Li, W.-K. Ma, and A. M.-C. So, "Stochastic amplify-and-forward schemes for multigroup multicast transmission in a distributed relay network," in Proc. SPAWC 2015, Stockholm, Sweden, Jun. 2015.
  3. W.-K. Ma, C.-H. Lin, W.-C. Li, and C.-Y. Chi, "When can the minimum volume enclosing simplex identify the endmembers correctly when there is no pure pixel?" in Proc. WHISPERS 2015, Tokyo, Japan, Jun. 2015. [PDF]
  4. X. Wu, A. M.-C. So, and W.-K. Ma, "A beamformed Alamouti amplify-and-forward scheme in multigroup multicast cloud-relay networks," in Proc. ICASSP 2015, Brisbane, Australia, Apr. 2015.
  5. M. Medra, W.-K. Ma, and T. N, Davidson, "Low-complexity robust MISO downlink precoder optimization in the limited feedback case," in Proc. ICASSP 2015, Brisbane, Australia, Apr. 2015.
  6. N. Gillis and W.-K. Ma, "Enhancing pure-pixel identification performance via preconditioning," in Proc. WHISPERS 2014, Lausanne, Switzerland, Jun. 2014.
  7. X. Fu, W.-K. Ma, J. M. Bioucas-Dias, and T.-H. Chan, ¡§A robust method for semiblind dictionary-aided hyperspectral unmixing,¡¨ in Proc. WHISPERS 2014, Lausanne, Switzerland, Jun. 2014.
  8. X. Fu, N. D. Sidiropoulos, and W.-K. Ma, "Tensor-based power spectra separation and emitter localization for cognitive radio," in Proc. SAM 2014, A Coruña, Spain Jun. 2014 (finalist of SAM2014 Best Student Paper Competition).
  9. X. Fu, N. D. Sidiropoulos, W.-K. Ma, and J. Tranter, "Blind spectra separation and direction finding for cognitive radio using temporal correlation-domain ESPRIT," in Proc. ICASSP 2014, Florence, Italy, May 2014 (won an ICASSP2014 Best Student Paper Award).
  10. J. Pan and W.-K. Ma, "Antenna subset selection optimization for large-scale MISO constant envelope precoding," in Proc. ICASSP 2014, Florence, Italy, May 2014. [Companion Technical Report]
  11. Q. Li, A. M.-C. So, and W.-K. Ma, "Distributionally robust chance-constrained transmit beamforming for multiuser MISO downlink," in Proc. ICASSP 2014, Florence, Italy, May 2014.
  12. X. Wu, Q. Li, W.-K. Ma, and A. M.-C. So, "Robust transmit designs for an energy harvesting multicast system," in Proc. ICASSP 2014, Florence, Italy, May 2014.
  13. Q. Li, W.-K. Ma, and A. M.-C. So, "Robust artificial noise-aided transmit optimization for achieving secrecy and energy harvesting," in Proc. ICASSP 2014, Florence, Italy, May 2014.
  14. X. Fu, W.-K. Ma, T.-H. Chan, J. M. Bioucas-Dias, and M.-D. Iordache, "Greedy algorithms for pure pixel identification in hyperspectral unmixing: A multiple-measurement vector viewpoint, " in Proc. EUSIPCO, Marrakech, Morocco, Sep 2013. [PDF]
  15. Y. Yang, Q. Li, W.-K. Ma, J. Ge, and M. Lin, "Optimal joint cooperative beamforming and artificial noise design for secrecy rate maximization in AF relay networks," in Proc. SPAWC, Darmstadt, Germany, Jun 2013.
  16. J. Pan and W.-K. Ma, "Signal region characterization and exact phase recovery for constant envelope precoding in single-user large-scale MISO channels," in Proc. ICASSP, Vancouver, Canada, May 2013.
  17. S. Ji, X. Wu, A. M.-C. So, and W.-K. Ma, "Multi-group multicast beamforming in cognitive radio networks via rank-two transmit beamformed Alamouti space-time coding," in Proc. ICASSP, Vancouver, Canada, May 2013.
  18. X. Fu and W.-K. Ma, "Blind separation of convolutive mixtures of speech sources: Exploiting local sparsity," in Proc. ICASSP, Vancouver, Canada, May 2013.
  19. J. Vovnoboy, A. Wiesel, and W.-K. Ma, "Robust semi-definite relaxation MIMO detection in a non-Gaussian channel," in Proc. ICASSP, Vancouver, Canada, May 2013.
  20. H.-T. Wai, Q. Li, and W.-K. Ma, "A convex approximation method for multiuser MISO sum rate maximization under discrete rate constraints," in Proc. ICASSP, Vancouver, Canada, May 2013.
  21. Q. Li, M.-Y. Hong, H.-.T. Wai, W.-K. Ma, Y.-F. Liu, and Z.-Q. Luo, "An alternating optimization algorithm for the MIMO secrecy capacity problem under sum power and per-antenna power constraints," in Proc. ICASSP, Vancouver, Canada, May 2013.
  22. E. Wycoff, T.-H. Chan, K. Jia, W.-K. Ma, and Y. Ma, "A non-negative sparse promoting algorithm for high resolution hyperspectral imaging," in Proc. ICASSP, Vancouver, Canada, May 2013.
  23. Y. Yang, T.-H. Chang, J. Ge, W.-K. Ma, and P. C. Ching, "Achieving full cooperative and frequency diversity in bit-interleaved coded two-way relay networks," in Proc. IEEE WCNC, Shanghai, China, 2013.
  24. X. Fu; W.-K. Ma, F. W. K. Chan and H. C. So, "complex-valued semidefinite relaxation approach for two-dimensional source localization using distance measurements and imperfect receiver positions," in Proc. International Conference on Signal Processing, Beijing, China, 2012.
  25. H.-T. Wai and W.-K. Ma, "A decentralized method for joint admission control and beamforming in coordinated multicell downlink," in Proc. Asilomar Conf. 2012, Pacific Grove, Nov 2012.
  26. H.-E. Huang, T.-H. Chan, A. Ambikapathi, W.-K. Ma, and C.-Y. Chi, "Outlier-robust dimension reduction and its impact on hyperspectral endmember extraction," in Proc. WHISPERS 2012, Shanghai, China, Jun 2012.
  27. X. Fu and W.-K. Ma, "A simple closed-form solution for overdetermined blind separation of locally sparse quasi-stationary sources," in Proc. IEEE ICASSP 2012, Kyoto, Japan, Mar 25-30, 2012.
  28. X. Wu, A. M.-C. So, and W.-K. Ma, "Rank-two transmit beamformed Alamouti space-time coding for physical-layer multicasting," in Proc. IEEE ICASSP 2012, Kyoto, Japan, Mar 25-30, 2012.
  29. T.-H. Chan, J.-Y. Liou, A. Ambikapathi, W.-K. Ma, and C.-Y. Chi, "Fast algorithms for robust hyperspectral endmember extraction based on worst-case simplex volume maximization,"in Proc. IEEE ICASSP 2012, Kyoto, Japan, Mar 25-30, 2012.
  30. K.-Y. Wang, T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "Optimal transmission strategy for outage rate maximization in MISO fading channels with training," in Proc. IEEE ICASSP 2012, Kyoto, Japan, Mar 25-30, 2012.
  31. Q. Li, W.-K. Ma, and A. M.-C. So, "Safe convex approximation to outage-based MISO secrecy rate optimization under imperfect CSI and with artificial noise," in Proc. Asilomar Conf. 2011, Pacific Grove, Nov 6-9, 2011.
  32. T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "Worst-case robust multiuser transmit beamforming using semidefinite relaxation: Duality and implications," in Proc. Asilomar Conf. 2011, Pacific Grove, Nov 6-9, 2011.
  33. K. K. Lee, W.-K. Ma, Y.-L. Chiou, T.-H. Chan, and C.-Y. Chi, "Blind identification of mixtures of quasi-stationary sources using a Khatri-Rao subspace approach," in Proc. Asilomar Conf. 2011, Pacific Grove, Nov 6-9, 2011.
  34. T.-H. Chan, C.-J. Song, A. Ambikapathi, C.-Y. Chi, and W.-K. Ma, "Fast alternating volume maximization algorithm for blind separation of non-negative sources," in Proc. 2011 IEEE International Workshop on Machine Learning for Signal Processing, Beijing, China, Sep 18-21, 2011.
  35. T.-H. Chan, W.-K. Ma, A. Ambikapathi, and C.-Y. Chi, "An optimization perspective on Winter endmember extraction belief," in Proc. IEEE IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011 (invited paper).
  36. T.-H. Chan, W.-K. Ma, A. Ambikapathi, and C.-Y. Chi, "Robust endmember extraction using worst-case simplex volume maximization," in Proc. WHISPERS 2011, Lisbon, Portgual, June 4-7, 2011. (won Best Paper Award)
  37. J. Pan and W.-K. Ma, "A Lagrangian dual relaxation approach to ML MIMO detection: reinterpreting regularized Lattice decoding," in Proc. IEEE ICASSP 2011, Prague, Czech, May 22-27, 2011 (won ICASSP2011 Best Student Paper Award).
  38. X. Wu and W.-K. Ma, "Multicast transmit beamforming using a randomize-in-time strategy," in Proc. IEEE ICASSP 2011, Prague, Czech, May 22-27, 2011.
  39. H.-T. Wai, W.-K. Ma, and A. M.-C. So. "Cheap semidefinite relaxation MIMO detection using row-by-row block coordinate descent," in Proc. IEEE ICASSP 2011, Prague, Czech, May 22-27, 2011.
  40. Q. Li and W.-K. Ma, "A robust artificial noise aided transmit design for MISO secrecy," in Proc. IEEE ICASSP 2011, Prague, Czech, May 22-27, 2011.
  41. Y. Huang, Q. Li, W.-K. Ma and S. Zhang, "Robust secondary multicast transmit beamforming for cognitive radio networks under imperfect channel state information," in Proc. IEEE ICASSP 2011, Prague, Czech, May 22-27, 2011.
  42. K.-Y. Wang, T.-H. Chang, W.-K. Ma, A. M.-C. So, and C.-Y. Chi, "Probabilistic SINR constrained robust transmit beamforming: A Bernstein-type inequality based conservative approach," in Proc. IEEE ICASSP 2011, Prague, Czech, May 22-27, 2011.
  43. Q. Li and W.-K. Ma, "Multicast secrecy rate maximization for MISO channels with multiple multi-antenna eavesdroppers," in Proc. IEEE ICC 2011, Kyoto, Japan, 5-9 June, 2011.
  44. F. Tian, W. Zhang, W.-K. Ma, and P. C. Ching, "Distributed space-time coding for two-path successive relaying," in Proc. IEEE Global Communications Conference (GLOBECOM 2010), Miami, USA, Dec. 6-10, 2010.
  45. Q. Li and W.-K. Ma, "Optimal transmit design for MISO secrecy-rate maximization with general covariance constraints," in 2010 Intl. Symp. Intelligent Signal Process. and Commun. Syst. (ISPACS 2010), Dec 6-8, 2010.
  46. K.-Y. Wang, T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "A Semidefinite relaxation based conservative approach to robust transmit beamforming with probabilistic SINR constraints," in EUSIPCO 2010, Aug. 2010.
  47. A. Ambikapathi, T.-H. Chan, W.-K. Ma, and C.-Y. Chi, "A robust alternating volume maximization algorithm for endmember extraction in hyperspectral images," in WHISPER2010 (Second Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing), Reykjavik, Iceland, Jun. 2010.
  48. A. Ambikapathi, T.-H. Chan, W.-K. Ma, and C.-Y. Chi, "A robust minimum volume enclosing simplex algorithm for hyperspectral unmixing," in 2010 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Mar. 2010.
  49. W.-C. Liao, T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "Joint transmit beamforming and artificial noise design for QoS discrimination in wireless downlink," in 2010 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Mar. 2010.
  50. Q. Li and W.-K. Ma, "Secrecy rate maximization of a MISO channel with multiple multi-antenna eavesdroppers via semidefinite programming," in 2010 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Mar. 2010.
  51. T.-H. Chan, W.-K. Ma, C.-Y. Chi, and A. Ambikapathi, "Hyperspectral unmixing from a convex analysis and optimization perspective," in WHISPER2009 (First Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing), Grenable, France, Aug. 2009. (invited paper)
  52. T.-H. Chang, W.-K. Ma, C.-Y. Kuo, and C.-Y. Chi, "Blind maximum-likelihood detection for decode-and-forward randomized distributed OSTBC," in SPAWC2009, Perugia, Italy, June 2009.
  53. W.-K. Ma, T.-H. Hsieh, and C.-Y. Chi, "DOA estimation of quasi-stationary signals via Khatri-Rao subspace," in 2009 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Apr 2009.
  54. T.-H. Chang, W.-K. Ma, C.-Y. Huang, and C.-Y. Chi, "On perfect channel identifiability of semiblind ML detection of orthogonal space-time block coded OFDM," in 2009 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Apr 2009.
  55. Z. Quan, W.-K. Ma, S. Cui, and A. H. Sayed, "Optimal linear fusion for distributed spectrum sensing via semidefinite programming," in 2009 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Apr 2009.
  56. T.-H. Chan, C.-Y. Chi, Y.-M. Huang, and W.-K. Ma, "A convex analysis based minimum-volume enclosing simplex algorithm for hyperspectral unmixing," in 2009 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Apr 2009.
  57. W. K. Lui, W.-K. Ma, H. C. So, and K. W. Chan, "Semi-definite programming approach to sensor network node localization with anchor position uncertainty," in 2009 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Apr 2009.
  58. F. Tian, X.-G. Xia, W.-K. Ma, and P. C. Ching, "Full diversity under multiple carrier frequency offsets of a family of space-frequency codes," in 2009 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Apr 2009.
  59. C.-W. Shin, T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "A linear fractional semidefinite relaxed ML approach to blind detection of 16-QAM orthogonal space-time block codes," in Proc. 2008 IEEE Intl. Conf. Commun., May 2008.
  60. W.-K. Ma, C.-C. Su, J. Jalden, and C.-Y. Chi, "Some results on 16-QAM MIMO detection using semidefinite relaxation," in 2008 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Mar. 2008.
  61. T.-H. Chan, W.-K. Ma, C.-Y. Chi, and Y. Wang, "Blind separation of non-negative sources by convex analysis: Effective method by linear programming," in 2008 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Mar. 2008.
  62. X. Chen, C.-Y. Chi, C.-W. Lin, W.-K. Ma, S. Zhou, and Y. Yao, "A blind post-FFT user-by-user beamforming algorithm for multiuser OFDM systems," in CHINACOM2007, Aug. 2007.
  63. C.-H. Peng, K.-C. Huang, C.-Y. Chi, W.-K. Ma, and T.-H. Tsai, "A block-by-block blind post-FFT beamforming algorithm for multiuser OFDM systems based on subcarrier averaging," in SPAWC2007, June 2007.
  64. T.-H. Tsai, X. Chen, C.-Y. Chi, W.-K. Ma, S. Zhou, & Y. Yao, "Subcarrier average based block-by-block blind channel estimation algorithm for multi-user OFDM systems," in SPAWC2007, June 2007.
  65. W.-K. Ma, "Nonintersecting subspace OSTBCs for blind ML detection," in 2007 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Apr. 2007.
  66. T.-H. Chan, W.-K. Ma, C.-Y. Chi, and Y. Wang, "A Convex analysis based criterion for blind separation of non-negative sources," in 2007 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Apr. 2007.
  67. T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "Semiblind ML OSTBC-OFDM detection in block fading channels," in 2007 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Apr. 2007.
  68. K. W. Chan, H. C. So, and W.-K. Ma, "A Novel subspace approach for wireless sensor network positioning with range measurements," in 2007 IEEE Intl. Conf. Acoustic, Speech, and Signal Processing, Apr. 2007.
  69. T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "Group-wise blind OFDM ML detection for complexity reduction," in Proc. 2006 European Signal Processing Conference, Sept. 2006.
  70. A. Pasha, B.-N. Vo, H. D. Tuan, and W.-K. Ma, "Closed form PHD filtering for linear jump Markov models," in Proc. 9th International Conference on Information Fusion, July 2006. (won the Best Student Paper Contest)
  71. W.-K. Ma, C.-Y. Chi, and P. C. Ching, "Extended differential unitary space-time modulation: A noncoherent scheme with error penalty less than 3dB," Proceedings of 2006 IEEE International Conference on Acoustic, Speech, and Signal Processing, Toulouse, May 2006.
  72. B.-N. Vo and W.-K. Ma, "A closed-form solution for the probability hypothesis density filter," The 8th International Conference on Information Fusion, Philadelphia, July 2005.
  73. W.-K. Ma, B.-N. Vo, T.N. Davidson, "On implementing the blind ML receiver for orthogonal space-time block codes," Proceedings of 2005 IEEE International Conference on Acoustic, Speech, and Signal Processing, March 2005.
  74. B.-N. Vo, W.-K. Ma, and S. Singh, "Localizing an unknown time-varying number of speakers: A random finite set approach," Proceedings of 2005 IEEE International Conference on Acoustic, Speech, and Signal Processing, March 2005.
  75. J. Jalden, B. Ottersten, and W.-K. Ma, "Reducing the average complexity of ML detection using semidefinite relaxation," Proceedings of 2005 IEEE International Conference on Acoustic, Speech, and Signal Processing, March 2005.
  76. B.N. Vo and W.-K. Ma, "Joint detection and tracking of multiple maneuvering targets using random finite sets," Proceedings of 8th International Conference on Control, Automation, Robotics and Vision, December 2004.
  77. W.-K. Ma, P.C. Ching, T.N. Davidson, and B.-N. Vo, "Blind symbol identifiability of orthogonal space-time block codes," Proceedings of 2004 IEEE International Conference on Acoustic, Speech, and Signal Processing, May 2004.
  78. K.W. Cheung, W.-K. Ma, and H.C. So, "Accurate approximation algorithm for TOA-based maximum likelihood mobile location using semidefinite programming," Proceedings of 2004 IEEE International Conference on Acoustic, Speech, and Signal Processing, May 2004.
  79. B.-N. Vo, S. Singh, and W.-K. Ma, "Tracking multiple speakers using random sets," Proceedings of 2004 IEEE International Conference on Acoustic, Speech, and Signal Processing, May 2004.
  80. W. Zhang, X.-G. Xia, P.C. Ching, and W.-K. Ma, "On the number of pilots for OFDM system in multipath fading channels," Proceedings of 2004 IEEE International Conference on Acoustic, Speech, and Signal Processing, May 2004.
  81. W.-K. Ma, P.C. Ching, T.N. Davidson, and X.-G. Xia, "Blind maximum-likelihood decoding for orthogonal space-time block codes: a semidefinite relaxation approach," Proceedings of IEEE 2003 Global Communications Conference, December 2003.
  82. W.-K. Ma, P.C. Ching, and Z. Ding, "Efficient relaxed maximum-likelihood M-ary PSK multiuser detection using semidefinite programming," 4th IEEE Signal Processing Workshop on Signal Processing Advances in Wireless Communications, June 2003.
  83. W.-K. Ma and P.C. Ching, "Robust interference suppression and blind speech beamforming in room reverberant environments," Proceedings of 2003 IEEE International Conference on Acoustic, Speech, and Signal Processing, April 2003.
  84. K.W. Cheung, H.C. So, W.-K. Ma, and Y.T. Chan, "Received signal strength mobile positioning via constrained weighted least squares," Proceedings of 2003 IEEE International Conference on Acoustic, Speech, and Signal Processing, April 2003.
  85. W.-K. Ma, T.N. Davidson, K.M. Wong, and P.C. Ching, "Multiuser detection for asynchronous CDMA using block coordinate ascent and semi-definite relaxation," Proceedings of 2002 IEEE International Conference on Acoustic, Speech, and Signal Processing, May 2002.
  86. W.-K. Ma, T.N. Davidson, K.M. Wong, Z.Q. Luo and P.C. Ching, "Efficient quasi-maximum-likelihood multiuser detection by semi-definite relaxation," Proceedings of 2001 IEEE Conference on Communications, vol. 1, pp. 6-10, 2001.
  87. W.-K. Ma, T.N. Davidson, K.M. Wong, Z.Q. Luo, and P.C. Ching, "An efficient quasi-maximum-likelihood multiuser detector using semi-definite relaxation," Proceedings of 2001 3rd IEEE Signal Processing Workshop on Signal Processing Advances in Wireless Communications, pp. 186-189, 2001.
  88. W.-K. Ma, K.M. Wong, and P.C. Ching, "Maximum likelihood detection for multicarrier systems employing non-orthogonal pulse shapes," Proceedings of 2000 IEEE International Conference on Acoustic, Speech, and Signal Processing, vol. 5, pp. 2489-2492, 2000.
  89. W.-K. Ma, K.M. Wong, and P.C. Ching, "Performance analysis of maximum-likelihood detectors for non-orthogonal multiuser signals," Proceedings of 1999 2nd IEEE Signal Processing Workshop on Signal Processing Advances in Wireless Communications, pp. 25-28, 1999.
  90. H.C. So, W.-K. Ma, and Y.T. Chan, "Detection of narrowband random signals via spectrum matching," Proceedings of 1998 Midwest Symposium on Circuits and Systems, pp. 238-241, 1999.
  91. W.-K. Ma and Y.T. Zhang, "Optimum estimation and detection of distortion product otoacoustic emissions in white Gaussian noise," Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, vol. 3, pp. 1649-1652, 1998.

Technical Reports
  1. T.-H. Chang, W.-K. Ma, and C.-Y. Chi, "Linear fractional semidefinite relaxation approaches to discrete fractional quadratic optimization problems," Technical Report, Dept. Electronic Eng., June 2009.
  2. X. Wu, W.-K. Ma, and A. M.-C. So, "Achievable rate derivations and further simulation results for "Physical-layer multicasting by stochastic transmit beamforming and Alamouti space-time coding"," Technical Report, Dept. Electronic Eng., May 2013. [ArXiv]

 

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