-
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.
-
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.
-
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.
-
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.
-
T.-H.
Chan, W.-K. Ma, A. Ambikapathi, and C.-Y. Chi, "An optimization perspective
on Winter¡¦s endmember extraction belief," to appear in IGARSS 2011
(invited paper)
-
T.-H.
Chan, W.-K. Ma, A. Ambikapathi, and C.-Y. Chi, "Robust endmember extraction
using worst-case simplex volume maximization," in WHISPERS 2011.
(won Best Paper Award)
-
J. Pan
and W.-K. Ma, "A Lagrangian dual relaxation approach to ML MIMO detection:
reinterpreting regularized Lattice decoding," in ICASSP 2011
(won ICASSP2011 Best Student Paper Award).
-
X. Wu
and W.-K. Ma, "Multicast transmit beamforming using a randomize-in-time
strategy," in ICASSP 2011.
-
H.-T.
Wai, W.-K. Ma, and A. M.-C. So. "Cheap semidefinite relaxation MIMO
detection using row-by-row block coordinate descent," in ICASSP 2011.
-
Q. Li
and W.-K. Ma, "A robust artificial noise aided transmit design for MISO
secrecy," in ICASSP 2011.
-
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 ICASSP 2011.
-
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 ICASSP 2011.
-
Q. Li
and W.-K. Ma, "Multicast secrecy rate maximization for MISO channels with
multiple multi-antenna eavesdroppers," in ICC 2011.
-
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.
-
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.
-
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.
- 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.
- 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.
- 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.
- 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.
- 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)
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- W.-K. Ma, ¡§Nonintersecting subspace OSTBCs for blind ML detection,¡¨
in 2007 IEEE Intl. Conf. Acoustic, Speech, and
Signal Processing, Apr. 2007.
- 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.
- 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.
- 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.
- 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.
- 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)
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.