Signal processing for communication | Research

Research areas

MIMO and cooperative communications
Blind channel identification and signal separation
Optimization techniques for signal processing

Current Projects

Blind signal processing and its applications to speech separation, image separation and hyperspectral unmixing
To be added.
Interference management in MIMO communication
To be added.
Physical-layer security in MIMO communication
To be added.
Interference alignment and spatial diversity of MIMO Wireless Networks
To be added.
Spectrum Sharing in Wireless Networks
To be added.
Asynchronous Space-Time Block Code for Cooperative Communication
To be added.

Team

Publications

Publications in 2025 2025
1. J. Liu, Farzan Farnia and W.-K. Ma,"Multilayer Matrix Factorization via Dimension-Reducing Diffusion Variational Inference", Forty-second International Conference on Machine Learning (ICML 2025), Vancouver, Canada, July 13-19, 2025.
2. Qian Zhang, Mingjie Shao, Tong Zhang, Gaojie Chen, Ju Liu and P.C. Ching,"An Efficient Sum-Rate Maximization Algorithm for Fluid Antenna-Assisted ISAC System", IEEE Communications Letters, vol. 29, no. 1, pp. 200-204, Jan. 2025.
Publications in 2024 2024
1. Junbin Liu, Ya Liu, W.-K. Ma, Mingjie Shao and A.M.-C. So,"Extreme Point Pursuit—Part II: Further Error Bound Analysis and Applications", IEEE Transactions on Signal Processing, vol. 72, pp. 4557-4572, Dec. 2024.
2. Junbin Liu, Ya Liu, W.-K. Ma, Mingjie Shao and A.M.-C. So,"Extreme Point Pursuit—Part I: A Framework for Constant Modulus Optimization", IEEE Transactions on Signal Processing, vol. 72, pp. 4541-4556, Dec. 2024.
3. Yuening Li, Xiao Fu and W.-K. Ma,"Probabilistic Simplex Component Analysis via Variational Auto-Encoding", 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2024), pp. 9671-9675, Seoul, Korea, April 14-19, 2024.
4. Ya Liu, Junbin Liu and W.-K. Ma,"Cardinality-Constrained Binary Quadratic Optimization via Extreme Point Pursuit, with Application to the Densest K-Subgraph Problem", 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2024), pp. 9631-9635, Seoul, Korea, April 14-19, 2024.
5. W.-Y Keung, H.V. Cheng and W.-K. Ma,"Transmitting Data Through Reconfigurable Intelligent Surface: A Spatial Sigma-Delta Modulation Approach", 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2024), pp. 9251-9255, Seoul, Korea, April 14-19, 2024.
6. W.-Y Keung, Y. Liu and W.-K. Ma,"Robust Symbol-Level Precoding via a Symbol-Perturbed Zero-Forcing Structure", 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2024), pp. 9226-9230, Seoul, Korea, April 14-19, 2024.
7. W.-Y Keung and W.-K. Ma,"Spatial Sigma-Delta Modulation for Coarsely Quantized Massive MIMO Downlink: Flexible Designs by Convex Optimization", IEEE Open Journal of Signal Processing, vol. 5, pp. 520-538, Jan. 2024.
8. Tong Zhang, Shuai Wang, Yinfei Xu, Rui Wang, P.C. Ching and H. Vincent Poor,"The Generalized Degrees-of-Freedom Region of the Two-User MIMO Broadcast Channel With Delayed CSIT", IEEE Transactions on Information Theory, vol. 70, no. 2, pp. 1167-1177, Feb. 2024.
9. Mingjie Shao, W.-K. Ma, J. Liu and Zihao Huang,"Accelerated and Deep Expectation Maximization for One-Bit MIMO-OFDM Detection", IEEE Transactions on Signal Processing, vol. 72, pp. 1094-1113, Jan. 2024.
Publications in 2023 2023
1. Shuo Zheng, Bojie Lv, Tong Zhang, Yinfei Xu, Gaojie Chen, Rui Wang and P.C. Ching,"On DoF of Active RIS-Assisted MIMO Interference Channel With Arbitrary Antenna Configurations: When Will RIS Help?", IEEE Transactions on Vehicular Technology, vol. 72, no. 12, pp. 16828-16833, Dec. 2023.
2. J. Liu, M.J. Shao and W.-K. Ma,"Probabilistic Semi-Nonnegative Matrix Factorization via Maximum-Likelihood and Variational Inference", 2023 2023 31st European Signal Processing Conference (EUSIPCO), pp.1280-1284, Helsinki, Finland, Sept. 4-8, 2023.
3. M.J. Shao, W.-K. Ma and Y. Liu,"Symbol-Level Precoding is Related to Parameter Estimation from Quantized Data", 2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2023), Rhodes Island, Greece, June 4-10, 2023.
4. W.-Y. Keung, H.-T. Wai and W.-K. Ma,"Secure Integrated Sensing and Communication Downlink Beamforming: A Semidefinite Relaxation Approach With Tightness Guaranteed", 2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2023) Workshops, Rhodes Island, Greece, June 4-10, 2023.
5. Y.N. Li, W.-K. Ma, R.Y. Wu and H.K. Liu,"A Simple Scheme for Coupled Factorization for Hyperspectral Super-Resolution: Exploiting Sparsity in an Easy Way", 2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2023), Rhodes Island, Greece, June 4-10, 2023.
6. M.J. Shao, W.-K. Ma and J. Liu,"An Explanation of Deep MIMO Detection From a Perspective of Homotopy Optimization", IEEE Open Journal of Signal Processing, vol. 4, pp. 108-116, Feb. 2023.
Publications in 2022 2022
1. Y. Ge and P.C. Ching,"Energy Efficiency for Proactive Eavesdropping in Cooperative Cognitive Radio Networks", IEEE Internet of Things Journal, vol. 9, no. 15, pp. 13443-13457, Aug. 2022.
2. M.J. Shao, Q. Dai and W.-K. Ma,"Extreme-Point Pursuit for Unit-Modulus Optimization", 2022 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2022), pp. 5548-5552, Singapore, May 22-27, 2022.
3. Junbin Liu, M.J. Shao and W.-K. Ma,"MIMO Detection by Variational Posterior Inference", 2022 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2022), pp. 5343-5347, Singapore, May 22-27, 2022.
4. Chujun Huang, M.J. Shao, W.-K. Ma and Anthony M-C. So,"SISAL Revisited", SIAM Journal on Imaging Sciences, vol.15, Issue 2, pp. 591-624, May 2022.
5. Yatao Liu, M.J. Shao, W.-K. Ma and Q. Li,"Symbol-Level Precoding Through the Lens of Zero Forcing and Vector Perturbation", IEEE Transactions on Signal Processing, vol.70, pp. 1687-1703, Feb. 2022.
Publications in 2021 2021
1. R.Y. Wu, W.-K. Ma, Y.N. Li, Anthony M.-C. So and N.D. Sidiropoulos,"Probabilistic Simplex Component Analysis", IEEE Transactions on Signal Processing, vol. 70, pp. 582-599, Dec. 2021.
2. X. Wu, X. Li, J. Li, P.C. Ching, Victor C.M. Leung and H. Vincent Poor,"Caching Transient Content for IoT Sensing: Multi-Agent Soft Actor-Critic", IEEE Trans. on Communications, vol. 69, No. 9, pp. 5886-5901, Sept. 2021.
3. Ya Liu, M.J. Shao and W.-K. Ma,"A Homotopy Optimization Method for Orthogonal Non-Negative Matrix Factorization", 2021 29th European Signal Processing Conference (EUSIPCO), pp. 1085-1089, Dublin, Ireland, Aug. 23-27, 2021.
4. X. Wu, J. Li, M. Xiao, P.C. Ching and H. Vincent Poor,"Multi-Agent Reinforcement Learning for Cooperative Coded Caching via Homotopy Optimization", IEEE Trans. on Wireless Communications, vol. 20, No. 8, pp. 5258-5272, Aug. 2021.
5. W.-K. Ma,"On Hyperspectral Unmixing", 2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, pp. 17-20, Virtual Symposium, Brussels, Belgium, July 12-16, 2021.
6. Y.N. Li, W.-K. Ma and N. D. Sidiropoulos,"Robust Probabilistic Simplex Component Analysis", 2021 IEEE Statistical Signal Processing Workshop (SSP 2021), pp. 456-460, Virtual Rio de Janeiro, Brazil, July 11-14, 2021.
7. Y. Ge, Q.W. Deng, P.C. Ching and Zhi Ding,"Receiver Design for OTFS with a Fractionally Spaced Sampling Approach", IEEE Trans. on Wireless Communications, vol. 20, Iss. 7, pp. 4072-4086, July 2021.
8. M.J. Shao and W.-K. Ma,"Divide and conquer: One-bit MIMO-OFDM detection by inexact expectation maximization", 2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2021), pp. 4890-4894, Virtual Toronto, Ontario, Canada, June 6-11, 2021.
9. Y. Ge, Q.W. Deng, P.C. Ching and Zhi Ding,"OTFS Signaling for Uplink NOMA of Heterogeneous Mobility Users", IEEE Trans. on Communications, vol. 69, Iss. 5, pp. 3147-3161, May 2021.
Publications in 2020 2020
1. M.J. Shao and W.-K. Ma,"Binary MIMO detection via homotopy optimization and its deep adaptation", IEEE Transactions on Signal Processing, vol. 69, pp. 781-796, Dec. 2020.
2. X. Wu, X. Li, J. Li, P.C. Ching and H.V. Poor,"Deep Reinforcement Learning for loT Networks: Age of Information and Energy Cost Tradeoff", 2020 IEEE Global Communications Conference (GlobeCom 2020), Virtual Conference, Taipei, Dec. 7-11, 2020.
3. Jiajin Li, Anthony M-C. So and W.-K. Ma,"Understanding Notions of Stationarity in Nonsmooth Optimization: A Guided Tour of Various Constructions of Subdifferential for Nonsmooth Functions", IEEE Signal Processing Magazine, vol. 37, Iss. 5, pp. 18-31, Sept. 2020.
4. M.J. Shao, Q. Li and W.-K. Ma,"Minimum symbol-error probability symbol-level precoding with intelligent reflecting surface", IEEE Wireless Communications Letters, vol. 9, Iss. 10, pp. 1601-1605, May 2020.
5. Q. Li, Y.T. Liu, M.J. Shao and W.-K. Ma,"Proximal Distance Algorithm For Nonconvex QCQP With Beamforming Applications", 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2020), pp. 5155-5159, Virtual Barcelona, Spain, May 4-8, 2020.
6. Y.N. Li, R.Y. Wu and W.-K. Ma,"Stochastic ML Estimation For Hyperspectral Unmixing Under EndMember Variability And Nonlinear Models", 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2020), pp. 5315-5319, Virtual Barcelona, Spain, May 4-8, 2020.
7. X. Wu, Q. Li, Y. Lu, H. V. Poor, V.C. Leung, and P.C. Ching,"Latency-Minimized Design of Secure Transmissions in UAV-Aided Communications", 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2020), pp. 8753-8757, Virtual Barcelona, Spain, May 4-8, 2020.
8. M.J. Shao, W.-K. Ma and Lee Swindlehurst,"Multiuser Massive Mimo Downlink Precoding Using Second-Order Spatial Sigma-Delta Modulation", 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2020), pp. 8966-8970, Virtual Barcelona, Spain, May 4-8, 2020.
9. X. Wu, Q. Li, X. Li, V. C. Leung, and P.C. Ching,"Joint Long-Term Cache Updating and Short-Term Content Delivery in Cloud-Based Small Cell Networks", IEEE Trans. on Commun., vol. 68, Iss. 5, pp. 3173-3186, May 2020.
10. R.-Y. Wu, W.-K. Ma, Xiao Fu and Qiang Li,"Hyperspectral Super-Resolution via Global-Local Low-Rank Matrix Estimation", IEEE Trans. on Geoscience and Remote Sensing, pp. 1-16, March 2020.
11. R.Y. Wu , H.-T. Wai, and W.-K. Ma,"Hybrid Inexact BCD for Coupled Structured Matrix Factorization in Hyperspectral Super-Resolution", IEEE Trans. On Signal Processing, vol.68, pp. 1728-1743, Feb. 2020.
Publications in 2019 2019
1. M.J. Shao, W.-K. Ma, Q. Li and Lee Swindlehurst,"Spatial Sigma-Delta Modulation for the Massive MIMO Downlink," Asilomar 2019, Austria, pp. 833-837, Nov., 2019
2. M.J. Shao, Q. Li, W.-K. Ma and Anthony M.-C. SO, "A Framework for One-Bit and Constant-Envelope Precoding Over Multiuser Massive MISO Channels," IEEE Trans. on Signal Processing, vol.67, No. 20, Oct., 2019
3. X. W. Wu, Q. Li, Victor C. M. Leung, and P.C. Ching, "Joint Fronthaul Multicast and Cooperative Beamforming for Cache-Enabled Cloud-Based Small Cell Networks: An MDS Codes-Aided Approach ," IEEE Trans. on Wireless Communications, vol. 18, no. 10, pp.4970-4982, Oct., 2019
4. M.J. Shao, W.-K. Ma, Q. Li, and Lee Swindlehurst, "One-Bit Sigma-Delta MIMO Precoding," IEEE Journal of Selected Topics in Signal Processing, Vol. 13, Iss. 5, pp. 1046-1061, September, 2019.
5. Y. Ge and P.C. Ching, "Spectrum Sharing and Energy Cooperation in Wireless Powered Cognitive Radio Networks," in Proc. IEEE VTC 2019, Hawaii, USA, Sept. 22-25, 2019.
6. X.W. Wu, Q.Li, X.H. Li, Victor C. M. Leung, and P.C. Ching, "Joint Long-Term Cache Allocation and Short-Term Content Delivery in Green Cloud Small Cell Networks," in Proc. IEEE ICC 2019, Shanghai, China, pp.1-6, May 20-24, 2019.
7. Y. T. Liu, M.J. Shao, and W.-K. Ma, "An ADMM algorithm for peak transmission energy minimization in symbol-level precoding," in Proc. IEEE ICASSP 2019, Brigthon, UK, pp. 4739-4743, May 12-17, 2019.
8. R. Y. Wu, Q. Li, and W.-K. Ma, "Stochastic Ml simplex-structured matrix factorization under the Dirichlet mixture model," in Proc. IEEE ICASSP 2019, Brigthon, UK, pp. 5561-5565, May 12-17, 2019.
9. M. J. Shao, Q. Li, and W.-K. Ma, "Discrete constant envelope transceiver design for multiuser massive MIMO downlink," in Proc. IEEE ICASSP 2019, Brigthon, UK, pp. 4684-4688, May 12-17, 2019.
10. X. W. Wu, X.H. Li, Q. Li, Victor C.M. Leung, and P.C. Ching, "Latency driven fronthaul bandwidth allocation and cooperative beamforming for cache-enabled cloud-based small cell networks," in Proc. IEEE ICASSP 2019, Brigthon, UK, pp. 4594-4598, May 12-17, 2019.
11. T. Zhang, and P.C. Ching, "Secure MIMO interference channel with confidential messages and delayed CSIT," in Proc. IEEE ICASSP 2019, Brigthon, UK, pp. 2437-2441 May 12-17, 2019.
Publications in 2018 2018
1. G. Yao, and P.C. Ching, "Robust secrecy design for MIMO SWIPT with artificial noise and full-duplex receiver jamming," in Proc. IEEE GlobalSIP 2018, Anaheim, USA, pp. 1296-1300, Nov. 26-29, 2018.
2. M.J. Shao, Q. Li, Y.T. Liu, and W.-K. Ma, "Multiuser one-bit massive MIMO precoding under MPSK signaling," in Proc. IEEE GlobalSIP 2018, Anaheim, USA, pp. 833-837, Nov. 26-29, 2018.
3. Q. Li, W.-K. Ma, and Q. Wu, "Hyperspectral super-resolution: Exact recovery in polynomial time," in Proc. IEEE Statistical Signal Processing Workshop 2018, Freiburg, Germany, pp. 378-382, June 10-13, 2018.
4. R. Y. Wu, Q. Li, X. Fu, and W.-K. Ma,"A convex low-rank regularization method for hyperspectral super-resolution," in Proc. IEEE Statistical Signal Processing Workshop 2018, Freiburg, Germany, pp. 383-387, June 10-13, 2018.
5. M. J. Shao, Q. Li, W.-K. Ma, and A. M.C. So, "Minimum symbol error rate-based constant envelope precoding for multiuser massive MISO downlink," in Proc. IEEE Statistical Signal Processing Workshop 2018, Freiburg, Germany, pp. 727-731, June 10-13, 2018.
6. Y. T. Liu, W.-K. Ma, "Symbol-level precoding is symbol-perturbed ZF when energy efficiency is sought," in Proc. IEEE ICASSP 2018, Calgary, Cananda, pp. 3869-3873, April 15-20, 2018.
7. R. Y. Wu, C. H. Chan, H. T. Wai, W.-K. Ma, and X. Fu, "Hi, BCD! Hybrid inexact block coordinate descent for hyperspectral super-resolution," in Proc. IEEE ICASSP 2018, Calgary, Cananda, pp. 2426-2430, April 15-20, 2018.
8. M. J. Shao, Q. Li, and W.-K. Ma, "One-bit massive MIMO precoding via a minimum symbol-error probability design," in Proc. IEEE ICASSP 2018, Calgary, Cananda, pp. 3579-3783, April 15-20, 2018.
9. X. W. Wu, and P.C. Ching, "Content delivery design for cached-aided cloud radio access network to achieve low latency," in Proc. IEEE ICASSP 2018, Calgary, Cananda, pp. 3749-3753, April 15-20, 2018.
10. T. Zhang, X. W. Wu, Y. F. Xu, Y. Ge, and P.C. Ching, "Three-user MIMO broadcast channel with delayed CSIT: A higher achievable DoF," in Proc. IEEE ICASSP 2018, Calgary, Cananda, pp. 3709-3713, April 15-20, 2018.
Publications in 2017 2017
1. R. Cai, Y. Liu, and P.C. Ching, "Transmission Code Design for Asynchronous Full-Duplex Relaying," International Journal of Electrical and Computer Systems (IJECS), vol. 3, pp. 1-8, August, 2017.
2. S. X. Wu, A. M.-C. So, J. X. Pan and W.-K. Ma, "Semidefinite relaxation and approximation analysis of a beamformed alamouti scheme for relay beamforming networks," IEEE Trans. on Signal Processing, vol. 65, no. 9, pp. 2428-2443, May, 2017.
3. W.-K. Ma, J. X. Pan, A. M.C. So, T. H. Chang, "Unraveling the rank-one solution mystery of robust MISO downlink transmit optimization: A verifiable sufficient condition via a new duality result," IEEE Trans. on Signal Processing, vol. 65, no. 7, pp. 1909-1924, April, 2017.
4. S. X. Wu, M.-C. Yue, A. M.-C. So and W.-K. Ma, "SDR approximation bounds for the robust multicast beamforming problem with interference temperature constraints," in Proc. IEEE ICASSP 2017, New Orleans, USA, pp. 4054-4058, March 4-9, 2017.
5. M. W. Un, W.-K. Ma, P.C. Ching, "Joint transmit beamforming optimization and uplink/downklink user selection in a full-duplex multi-user MIMO system," in Proc. IEEE ICASSP 2017, New Orleans, USA, pp. 3639-3643, March 4-9, 2017.
6. R. Y. Wu, W.-K. Ma, X. Fu, "A stochastic maximum-likelihood framework for simplex structured matrix factrization," in Proc. IEEE ICASSP 2017, New Orleans, USA, pp. 2557-2561, March 4-9, 2017.
7. M. J. Shao, W.-K. Ma, "A simple way to approximate average robust multiuser MISO transmit optimization under covariance-based CSIT," in Proc. IEEE ICASSP 2017, New Orleans, USA, pp. 3504-3508, March 4-9, 2017.
8. T. Zhang, P.C. Ching, "Interference alignment on MIMO X channel with synergistic CSIT," in Proc. IEEE ICASSP 2017, New Orleans, USA, pp. 3754-3758, March 4-9, 2017.
Publications in 2016 2016
1. R. Cai, Y. Liu and P.C. Ching, "Transmission code design in asynchronous full-duplex relay systems," in Proc. CIST Ottawa 2016, Canada, May 2016.
2. X. Fu, K. Huang, B. Yang, W.-K. Ma and N. D. Sidiropoulos, "Robust volume minimization-based matrix factorization for remote sensing and document clustering," IEEE Trans. on Signal Processing, vol. 64, no. 23, pp. 6254-6268, Dec. 2016.
3. X. Fu, W.-K. Ma, J. M. Bioucas-Dias and T. H. Chan, "Semiblind hyperspectral unmixing in the presence of spectral library mismatches," IEEE Trans. on Geoscience and Remote Sensing, vol. 54, no. 9, pp. 5171-5184, Sept. 2016.
4. X. Fu, N. D. Sidiropoulos and W.-K. Ma, "Power spectra separation via structured matrix factorization," IEEE Trans. on Signal Processing, vol. 64, no. 17, pp. 4592-4605, Sept. 2016.
5. H. T. Wai, Q. Li and W.-K. Ma, "Discrete sum rate maximization for MISO interference broadcast channels: Convex approximations and efficient algorithms," IEEE Trans. on Signal Processing, vol. 64, no. 16, pp. 4323-4336, Aug. 2016.
6. S. X. Wu, Q. Li, A. M. So and W.-K. Ma, "A stochastic beamformed amplify-and-forward scheme in a multigroup multicast MIMO relay network with per-antenna power constraints," IEEE Trans. on Wireless Communications, vol. 15, no. 7, pp. 4973-4986, July 2016.
7. M. Medra, Y. Huang, W.-K. Ma and T. N. Davidson, "Low-complexity robust MISO downlink precoder design under imperfect CSI," IEEE Trans. on Signal Processing, vol. 64, no. 12, pp. 3237-3249, June 2016.
8. Q. Li and W.-K. Ma, "A new low-rank solution result for a semidefinite program problem subclass with applications to transmit beamforming optimization," in Proc. IEEE ICASSP 2016, Shanghai, China, pp. 3446-3450,March 2016.
9. X. Fu and W.-K. Ma, K. Huang and N. D. Sidiropoulos, "Robust volume minimization-based matrix factorization via alternating optimization," in Proc. IEEE ICASSP 2016, Shanghai, China, pp. 2534-2538, March 2016.
10. R. Cai, W. Zhang, and P.C. Ching, "Cost-efficient optimization of base station densities for multiuser heterogeneous cellualr networks," IEEE Trans. on Wireless Communications, vol. 15, no. 3, pp. 2381-2393, March 2016.
11. Y. Liu, W. Zhang, and P.C. Ching, "Time-reversal space time codes in asynchronous two-way relay networks," IEEE Trans. on Wireless Communications, vol. 15, no. 3, pp. 1729-1741, March 2016.
12. X. Fu and W.-K. Ma, "Robustness analysis of structured matrix factorization via self-dictionary mixed-norm optimization," IEEE Signal Processing Letters, vol. 23, no. 1, pp. 60-64, Jan 2016.
Publications in 2015 2015
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 Trans. on Geoscience and Remote Sensing, vol. 53, no. 10, pp. 5530-5546, Oct. 2015.
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.
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, May 2015.
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 Trans. on Signal Processing, vol. 63, no. 9, pp. 2306-2320, May 2015.
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 Trans. on Signal Processing, vol. 63, no. 1, pp. 206-220, Jan 2015.
7. 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, pp. 435-439, Jun. 2015.
8. X. Wu, Q. Li, W.-K. Ma, A. M.-C. So, "Stochastic amplify-and-forward schemes for multigroup multicast transmission in a distributed relay network," in Proc. SPAWC 2015, Stockholm, Sweden, pp. 545-549, Jun. 2015.
9. 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, Tokoyo, Japan, Jun. 2015.
10. R. Cai, W. Zhang, and P.C. Ching, "Optimal base station densities for cost-efficient multi-tier heterogeneous cellular networks," in Proc. IEEE ICASSP 2015, pp.2889-2893, Brisbane, Australia, April 19-24, 2015.
11. 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. IEEE ICASSP 2015, pp.3088-3092, Brisbane, Australia, April 19-24, 2015.
12. M. Medra, W.-K. Ma, and T. N. Davidson, "Low-complexity robust MISO downlink precoder optimization For the limited feedback case," in Proc. IEEE ICASSP 2015, pp.3108-3112, Brisbane, Australia, April 19-24, 2015.
13. Y. Liu, W. Zhang, and P.C. Ching, "Time-reversal space-time codes in asynchronous two-way double-antenna relay networks," in Proc. IEEE ICASSP 2015, pp.3118-3122, Brisbane, Australia, April 19-24, 2015.
14. R. Cai, J.-K. Zhang, T. N. Davidson, W. Zhang, K. M. Wong, and P.C. Ching, "A power allocation strategy for multiple Poisson spectrum sharing networks," IEEE Trans. on Wireless Communications, vol.14, no.4, pp.1785-1799, April 2015.
Publications in 2014 2014
1. 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 Trans. on Signal Processing, vol. 62, no. 21, pp. 5690-5705, nov. 2014.
2. 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.
3. Y. Liu, W. Zhang, S. C. Liew, and P.C. Ching, "Bounded delay-tolerant space-time codes for distributed antenna systems," IEEE Trans. on Wireless Communications, vol. 13, no. 8, pp. 4644-4655, Aug 2014.
4. X. Fu, W.-K. Ma, J. M. Bioucas-Dias, and T.-H. Chan, "A robust subspace method for semiblind dictionary-aided hyperspectral unmixing," in Proc. IEEE Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS), Lausanne, Switzerland, June 24-27, 2014.
5. R. Cai, P.C. Ching and T. N. Davidson, "Tradeoff analysis of partial zero-forcing beamforming in large random spectrum sharing networks," in Proc. SPAWC 2014, pp. 75-79, Toronto, ON, Canada, June 22-25, 2014.
6. X. Fu, N. D. Sidiropoulos and W.-K. Ma, "Tensor-based power spectra separation and emitter localization for cognitive radio," in Proc. IEEE 8th Sensor Array and Multichannel Signal Processing Workshop (SAM) 2014, pp. 421-424, A Coruña, SPAIN, June 22-25, 2014.
7. Q. Li, W.-K. Ma and Anthony Man-Cho So, "Robust artificial noise-aided transmit optimization for achieving secrecy and energy harvesting," in Proc. IEEE ICASSP 2014, pp. 1615-1619, Florence, Italy, May 4-9, 2014.
8. J. Pan and W.-K. Ma, "Antenna subset selection optimization for large-scale MISO constant envelope precoding," in Proc. IEEE ICASSP 2014, pp. 3161-3165, Florence, Italy, May 4-9, 2014.
9. Q. Li, A. M.-C. So and W.-K. Ma, "Distributionally robust channce-constrained transmit beamforming for multiuser MISO downlink," in Proc. IEEE ICASSP 2014, pp. 3503-3507, Florence, Italy, May 4-9, 2014.
10. Y. Liu, W. Zhang, S. C. Liew and P.C. Ching, "Achieving full-diversity and fast maximum likelihood decoding in asychronous analog network coding," in Proc. IEEE ICASSP 2014, pp. 4312-4316, Florence, Italy, May 4-9, 2014.
11. X. Wu, Q. Li, W.-K. Ma and A. M.-C. So, "Robust transmit designs for an energy harvesting multicast system," in Proc. IEEE ICASSP 2014, pp. 4781-4785, Florence, Italy, May 4-9, 2014.
12. R. Cai, W. Zhang, P.C. Ching, T. N. Davidson and J.-K. Zhang, "Performance of partial zero-forcing beamforming in large random spectrum sharing networks," in Proc. IEEE ICASSP 2014, pp. 7039-7043, Florence, Italy, May 4-9, 2014.
13. L. Yang, W. Zhang, Nengheng Zheng and P.C. Ching, "Opportunistic user scheduling in MIMO cognitive radio networks," in Proc. IEEE ICASSP 2014, pp. 7353-7357, Florence, Italy, May 4-9, 2014.
14. 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. IEEE ICASSP 2014, pp. 7799-7803, Florence, Italy, May 4-9, 2014.
15. J. Pan, W.-K. Ma, and J. Jalden, "MIMO detection by Lagrangian dual maximum-likelihood relaxation: Reinterpreting regularized lattice decoding," IEEE Trans. on Signal Processing, vol. 62, no. 2, pp. 511-524, Jan 2014.
16. 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.
Publications in 2013 2013
1. 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).
2. 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.
3. X. Wu, W.-K. Ma, and A. M.C. So, "Physical-layer multicasting by stochastic transmit beamforming and Alamouti space-time coding," IEEE Trans. on Signal Processing, vol. 61, no. 17, pp. 4230-4245, Sep 2013.
4. Ye Yang, Qiang Li, W.-K. Ma , J. Ge and M. Lin, "Optimal joint cooperative beamforming and artifical noise design for secrecy rate maximization in AF relay networks," in Proc. IEEE SPAWC 2013, Darmstadt, Germany, June 2013.
5. C. Zhai, W. Zhang, and P.C. Ching, "Cooperative spectrum sharing based on two-path successive relaying," IEEE Trans. on Communications, vol. 61, no. 6, pp. 2260-2270, June 2013
6. Q. Li and W.-K. Ma, "Spatially selective artificial-noise aided transmit optimization for MISO multi-Eves secrecy rate maximization," IEEE Trans. on Signal Processing, vol. 61, no. 10, 2704-2717, May 2013
7. Q. Li, M. 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. IEEE ICASSP 2013, pp. 4359-4363, Vancouver, Canada, May, 2013.
8. Y. Liu, W. Zhang, and P.C. Ching, "Full-diversity distributed space-time codes with an efficient ML decoder for asynchronous cooperative communications," in Proc. IEEE ICASSP 2013, pp. 5011-5015, Vancouver, Canada, May, 2013.
9. R. Cai, J.-K. Zhang, T. N. Davidson, K. M. Wong, and P.C. Ching, "Power control for multiple spectrum-sharing networks under random geometric topologies," in Proc. IEEE ICASSP 2013, pp. 4809-4813, Vancouver, Canada, May, 2013.
10. Y. Zhang, P.C. Ching and Q. Zhang, "Hybrid spectrum sharing with imperfect sensing in fading channels," in Proc. IEEE ICASSP 2013, pp. 5318-5322, Vancouver, Canada, May, 2013.
11. 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. IEEE ICASSP 2013, pp. 4409-4413, Vancouver, Canada, May, 2013.
12. H.-T. Wai, Q. Li, W.-K. Ma , "A convex approximation method for multiuser MISO sum rate maximization under discrete rate constraints," in Proc. IEEE ICASSP 2013, pp. 4759-4763, Vancouver, Canada, May, 2013.
13. E. Wycoff, T.-H. Chan, K. Jia, W.-K. Ma and Yi Ma, "A non-negative sparse promoting algorithm for high resolution hyperspectral imaging,"in Proc. IEEE ICASSP 2013, pp. 1409-1413, Vancouver, Canada, May, 2013.
14. J. Pan, W.-K. Ma , "Signal region characterization and exact phase recovery for constant envelope precoding in single-user large-scale MISO channels," in Proc. IEEE ICASSP 2013, pp. 5065-5069, Vancouver, Canada, May, 2013.
15. J. Vovnoboy, A. Wiesel, W.-K. Ma , "Robust semi-definite relaxation MIMO detection in a non-Gaussian channel," in Proc. IEEE ICASSP 2013, pp. 5494-5498, Vancouver, Canada, May, 2013.
16. X. Fu and W.-K. Ma, "Blind separation of convolutive mixtures of speech sources: Exploiting local sparsity," in Proc. IEEE ICASSP 2013, pp. 4315-4319, Vancouver, Canada, May, 2013.
17. Y. Yang, T.-H. Chang, J.-H. Ge, W.-K. Ma and P.C. Ching, "Achieving full cooperative and frequency diversity in bit-interleaved coed two-way relay networks," in Proc. IEEE WCNC, pp. 3283-3288, Shanghai, China, April 7-10, 2013.
18. Y. Yang, Q. Li, W.-K. Ma, J.-H. Ge, and P.C. Ching, "Cooperative secure beamforming for AF relay networks with multiple eavesdroppers," IEEE Signal Processing Letters, vol. 20, no. 1, pp.35-39, Jan. 2013.
Publications in 2012 2012
1. C. Zhai, W. Zhang and P.C. Ching, "Spectrum leasing based on bandwidth efficient relaying in cognitive radio networks," in Proc. IEEE Globecom 2012, Anaheim, California, USA, pp. 4927 - 4932, Dec 3-7, 2012
2. X. Fu, F. Chan, W.-K. Ma and H.-C. So, "A complex-valued semidefinite relaxation approach for two-dimensional source localization using distance measurements and imperfect receiver positions," in Proc. 2012 IEEE 11th International Conference on Signal Processing (ICSP), vol.2, pp.1491-1494, 21-25 Oct. 2012
3. 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. on Signal Processing, vol. 60, no. 9, pp. 4849-4863, Sept 2012.
4. Y. Yang, T.-H. Chang, W.-K. Ma, J.-H. Ge, C.-Y. Chi and P.C. Ching, "Noncoherent Bit-Interleaved Coded OSTBC-OFDM with Maximum Spatial-Frequency Diversity," IEEE Trans. on Wireless Communications , vol. 11, no. 9, pp.3335-3347, Sept. 2012.
5. Y. Huang, Q. Li, W.-K. Ma, and S. Zhang, "Robust multicast beamforming for spectrum sharing-based cognitive radios," IEEE Trans. on Signal Processing, vol. 60, no. 1, pp. 527-533, Jan 2012.
6. C. Zhai, W. Zhang, P.C. Ching, "Spectrum sharing based on two-path successive relaying," in Proc. IEEE ICASSP 2012, pp. 2409-2412, Kyoto, Japan, Mar 25-30, 2012.
7. 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, pp. 2409-2412, Kyoto, Japan, Mar 25-30, 2012.
8. R. Cai, W. Zhang, P.C. Ching, "Spectrum sharing between random geometric networks," in Proc. IEEE ICASSP 2012, pp. 3137-140, Kyoto, Japan, Mar 25-30, 2012.
9. 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, pp. 2793-2796, Kyoto, Japan, Mar 25-30, 2012.
10. 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, pp. 1237-1240, Kyoto, Japan, Mar 25-30, 2012.
11. 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, pp. 2945-2948, Kyoto, Japan, Mar 25-30, 2012.
Publications in 2011 2011
1. 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.
2. 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.
3. 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.
4. T.-H. Chan, W.-K. Ma, A. Ambikapathi, and C.-Y. Chi, "A simplex volume maximization framework for hyperspectral endmember extraction," IEEE Trans. on Geoscience and Remote Sensing, vol. 49, no. 11, pp. 4194-4209, nov 2011.
5. 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. on Geoscience and Remote Sensing, vol. 49, no. 11, pp. 4177-4193, nov 2011.
6. 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. IEEE International Workshop on Machine Learning for Signal Processing, Beijing, China, Sep 18-21, 2011.
7. T.-H. Chan, W.-K. Ma, A. Ambikapathi, and C.-Y. Chi, "An optimization perspective on Winter's endmember extraction belief," in Proc. IEEE International Geoscience and Remote Sensing Symposium (IGARSS'), Sendai, Japan, Aug. 1-5, 2011.
8. T.-H. Chan, W.-K. Ma, A. Ambikapathi, and C.-Y. Chi, "Robust endmember extraction using worst-case simplex volume maximization," in Proc. IEEE Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS), Lisbon, Portugal, June 6-9, 2011.
9. F. Tian, W. Zhang, W.-K. Ma, P. C. Ching and V. Poor, "An effective distributed space-time code for two-path successive relay network," IEEE Trans. on Communications. vol. 59, no. 8, pp. 2254-2263, Aug 2011.
10. Q. Li and W.-K. Ma, "Optimal and robust transmit designs for MISO channel secrecy by semidefinite programming," IEEE Trans. on Signal Processing, vol. 59, no. 8, pp. 3799-3812, Aug 2011.
11. Q. Li and W.-K. Ma, "Multicast secrecy rate maximization for MISO channels with multiple multi-antenna eavesdroppers," in Proc. IEEE International Conference on Communications (ICC), pp. 1-5, Kyoto, Japan, 5-9 June 2011
12. Q. Li and W.-K. Ma, "A robust artificial noise aided transmit design for MISO secrecy," in Proc. IEEE ICASSP 2011, pp. 3436-3439, Prague, Czech Republic, May 22-27, 2011.
13. Sissi X. Wu and W.-K. Ma, "Multicast transmit beamforming using a randomize-in-time strategy," in Proc. IEEE ICASSP 2011, pp. 3376-3379, Prague, Czech Republic, May 22-27, 2011.
14. L Shi, W. Zhang and P.C. Ching, "Single-symbol decodable distributed STBC for two-path successive relay networks," in Proc. IEEE ICASSP 2011, pp. 3324-3327, Prague, Czech Republic, May 22-27, 2011.
15. Hoi-To Wai, W.-K. Ma and Anthony Man-Cho So, "Cheap semidefinite relaxation MIMO detection using row-by-row block coordinate descent," in Proc. IEEE ICASSP 2011, pp. 3256-3259, Prague, Czech Republic, May 22-27, 2011.
16. J. Pan and W.-K. Ma, "A Lagrangian dual relaxation approach to ML MIMO detection: reinterpreting regularized Lattice decoding," in Proc. IEEE ICASSP 2011, pp. 3084-3087, Prague, Czech Republic, May 22-27, 2011.
17. K.Y. Wang, T.H. Chang, W.-K. Ma, Anthony 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, pp. 3080-3083, Prague, Czech Republic, May 22-27, 2011.
18. 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, pp. 2816-2819, Prague, Czech Republic, May 22-27, 2011.
19. 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. on Signal Processing, vol. 59, no. 3, pp. 1202-1216, Mar 2011.
Publications in 2010 2010
1. F. Tian, W. Zhang, W.-K. Ma and P. C. Ching, "Distributed space-time coding for two-path successive relaying," in Proc. IEEE Globecom 2010, Miami, USA, pp. 1-5, Dec. 6-10, 2010.
2. 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.
3. 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. on Signal Processing, vol. 58, no. 4, pp. 2168-2180, April 2010.
4. 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. on Signal Processing, vol. 58, no. 4, pp. 2316-2326, April 2010. See also the companion technical report, and MATLAB demo codes.
5. Z. Quan, W.-K. Ma, S. Cui, and A. Sayed, "Optimal linear fusion for distributed detection via semidefinite programming," IEEE Trans. on Signal Processing, vol. 58, no. 4, pp. 2432-2436, April 2010.
6. 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.
7. ArulMurugan Ambikapathi, Tsung-Han Chan, W.-K. Ma, Chong-Yung Chi "A robust minimum volume enclosing simplex algorithm for hyperspectral unmixing," in Proc. IEEE ICASSP 2010, Dallas, Texas, USA, pp. 1202-1205, April 14-April 19, 2010.
8. Wei-Cheng Liao, Tsung-Hui Chang, W.-K. Ma, Chong-Yung Chi "Joint transmit beamforing and artificial noise design for QOS discrimination in wireless downlink," in Proc. IEEE ICASSP 2010, Dallas, Texas, USA, pp. 2562-2565, April 14-April 19, 2010.
9. Qiang Li, W.-K. Ma, "Secrecy rate maximization of a MISO channel with multiple multi-antenna eavesdroppers via semidefinite programming," in Proc. IEEE ICASSP 2010, Dallas, Texas, USA, pp. 3042-3045, April 14-April 19, 2010.
10. 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. on Vehicular Tech., vol. 59, no. 3, pp. 1517-1523, Mar. 2010.
Publications in 2009 2009
1. Kenneth W. K. Lui, W.-K. Ma, H. C. So , Frankie K. W. Chan, "Semi-definite programming approach to sensor network node localization with anchor position uncertatinty," in Proc. IEEE ICASSP 2009, Taipei, Taiwan, April 19-April 24, 2009.
2. T.-H. Chan, C.-Y. Chi, Y.-M. Huang W.-K. Ma, "A convex analysis based minimum-volume enclosing simplex algorithm for hyperspectral unmixing," in Proc. IEEE ICASSP 2009, Taipei, Taiwan, April 19-April 24, 2009.
3. W.-K. Ma, T.-H. Hsieh, C.-Y. Chi, "DOA estimation of quasi-stationary signals via Khatri-Rao subspace," in Proc. IEEE ICASSP 2009, Taipei, Taiwan, April 19-April 24, 2009.
4. T.-H. Chang, W.-K. Ma, C.-Y. Huang, C.-Y. Chi, "On perfect channel identifiability of semiblind ML detection of orthogonal space-time block coded OFDM," in Proc. IEEE ICASSP 2009, Taipei, Taiwan, April 19-April 24, 2009.
5. F. Tian, X.-G. Xia, W.-K. Ma, P. C. Ching, "Full diversity under multiple carrier frequency offsets of a family of space-frequency codes," in Proc. IEEE ICASSP 2009, Taipei, Taiwan, April 19-April 24, 2009.
6. Z. Quan, W.-K. Ma, Shuguang Cui, Ali H. Sayed, "Optimal linear fusion for distributed spectrum sensing via semidefinite programming," in Proc. IEEE ICASSP 2009, Taipei, Taiwan, April 19-April 24, 2009.
7. T.-H. Chang, W.-K. Ma, Chao-Yi Kuo, Chong-Yung Chi, "Blind maximum-likelihood detection for decode-and-forward randomized distributed OSTBC," in Proc. IEEE SPAWC, Perugia, Tialy, June 21-June 24, 2009.
8. F. Tian, X.-G. Xia, P. C. Ching, 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. on Vehicular Technology, vol. 58, no. 7, pp. 3396-3409, September 2009.
Publications in 2008 2008
1. W. Zhang, Y. Li, X.G. Xia, P. C. Ching, and K. B. Letaief, "Distributed space-frequency coding for cooperative diversity in broadband wireless ad hoc networks," IEEE Trans. on Wireless Communications, vol. 7, no. 3, pp. 995-1003, March 2008.
2. W.-K. Ma, Chao-Cheng Su, Joakim Jalden, and Chong-Yung Chi, "Some results on 16-QAM MIMO detection using semidefinite relaxation," in Proc. IEEE ICASSP 2008, Las Vegas, Nevada, USA, pp. 2673-2676, March 30-April 4, 2008.
3. T.-H. Chan W.-K. Ma, and Chong-Yung Chi, "Blind separation of non-negative sources by convex analysis: Effective method using linear programing," in Proc. IEEE ICASSP 2008, Las Vegas, Nevada, USA, pp. 3493-3496, March 30-April 4, 2008.
4. F. Tian, X.-G. Xia, and P. C. Ching, "A simple ICI mitigation method For a space-frequency coded cooperaative communication system with multiple CFOs," in Prcc. IEEE ICASSP 2008, pp. 3253-3256, Las Vegas, Nevada, USA, March 30-April 4, 2008.
5. F. Tian, X.-G. Xia, and P. C. Ching, "Signal detection in a cooperative communication system with multiple CFOs by exploting the properties of space-frequency codes," in Proc. IEEE ICC 2008, Beijing, China, pp. 4575-4579, May 19-23, 2008.
6. C.-W. Hsin, T.-H. Chang, W.-K. Ma, and Chong-Yung Chi, "A linear fractional semidefinite relaxed ML approach to blind detectin of 16-QAM orthogonal space-time block codes," in Proc. IEEE ICC 2008, Beijing, China, pp. 790-794, May 19-23, 2008.
Publications in 2007 2007
1. Shan Ouyang, Tan Lee and P.C. Ching "A power-based adaptive method for eigenanalysis without square-root operations," Digital Signal Processing, vol.17, no. 1, pp. 209-224, January 2007
2. W. Zhang, X.G. Xia and P.C. Ching, "High-rate full-diversity space-time-frequency codes for broadband MIMO blocking-fading channels," IEEE Trans. on Communications, vol. 55, no. 1, pp. 25 - 34, January 2007.
3. W. Zhang, X.G. Xia and P.C. Ching, "Clustered pilot tones for carrier frequency offset estimation in OFDM systems," IEEE Trans. on Wireless Communications, vol. 6, no. 1, pp. 101-109, January 2007.
4. W. Zhang, X.G. Xia and P.C. Ching, "Full-diversity and fast ML decoding properties of general orthogonal space-time block codes for MIMO-OFDM systems," IEEE Trans. on Wireless Communications, vol. 6, no. 5, pp. 1647-1653, May 2007.
5. F. Tian, X.G. Xia and P.C. Ching, "Signal detection for space-frequency coded cooperative communication system with multiple carrier frequency offsets," in Proc. IEEE Wireless Communication Networking Conf. (WCNC), Hong Kong, pp. 1221-1225, March 11-15, 2007.
6. Y.J. He and P.C. Ching, "Performance evaluation of adaptive two-dimensional turbo product codes composed of hamming codes," in Proc. IEEE International Conference on Integration Technology 2007, Shenzhen, China, pp. 103-107, March 20-24, 2007.
7. W. Zhang, Yabo Li, X.G. Xia, P.C. Ching and Khaled Ben Letaief, "Distributed space-frequency coding in broadband Ad hoc networks," in Proc. IEEE ICASSP 2007, Honolulu, Hawaii, USA, vol. III, pp. 489-492, April 15-20, 2007.
8. F. Tian, X.G. Xia and P.C. Ching, "Equalization in space-frequency coded cooperative communication system with multiple frequency offsets," in Proc. IEEE International Symposium on signals, circuits and systems (ISSCS) 2007, Iasi, Romania, pp. 577-580, July 12-13, 2007.
Publications in 2006 2006
1. Y.T. Chan, C.H. Yau and P.C. Ching, "Exact and approximate maximum likelihood localization algorithm," IEEE Trans on Vehicular Technology, vol. 55, no. 1, pp. 10-16, January 2006.
2. Y.T. Chan, W.Y. Tsui, H.C. So and P.C. Ching, "Time-of-arrival based localization under NLOS conditions," IEEE Trans on Vehicular Technology, vol. 55, no. 1, pp. 17-26, January 2006.
3. W. Zhang "Comments on Maximum diversity in single-carrier frequency-domain equalization," IEEE Trans. on Information Theory, vol. 52, no. 3, pp. 1275 - 1277, March 2006.
4. W. Zhang, X.G. Xia and P.C. Ching, "Optimal training and pilot pattern design for OFDM systems in Rayleigh fading," IEEE Trans. on Broadcasting, vol. 52, no. 4, pp. 505 - 514, December 2006.
5. W. Zhang, X.G. Xia and P.C. Ching, "Design of orthogonal space-time block codes for MIMO-OFDM systems with full diversity and fast ML decoding," in Proc. IEEE ICASSP 2006, Toulouse, France, vol. IV, pp. 169 - 172, May 14-19, 2006.
6. Z. Wang and P.C. Ching, "Constrained least squares estimation for position tracking," in Proc. IEEE ICASSP 2006, Toulouse, France, vol. IV, pp. 517 - 520, May 14-19, 2006.
7. W.K.Ma, C.Y. Chi and P.C. Ching, "Extended differential unitary space-time modulation: A non-coherent scheme with error penalty less than 3DB," in Proc. IEEE ICASSP 2006, Toulouse, France, vol. IV, pp. 529 - 532, May 14-19, 2006.
Publications in 2005 2005
1. H. Zhang, X.G. Xia, L. Cimini, Jr. and P.C. Ching, "Synchronization techniques and guard-band configuration scheme for single-antenna vector-OFDM systems," IEEE Trans. on Wireless Communications, vol. 4, no. 5, pp. 2454-2464, September 2005.
2. W.K.Ma, B.N. Vo, T.N. Davidson and P.C. Ching, "On implementing the blind ML receiver for orthogonal space-time block codes," in Proc. IEEE ICASSP 2005, Philadelphia, PA, USA, vol. III, pp. 437 - 440, March 2005.
3. W. Zhang, X.G. Xia, P.C. Ching and H. Wang, "Rate two full-diversity space-frequency code design for MIMO-OFDM," in Proc. IEEE SPAWC 2005, New York, NY, USA, pp. 321-325, June 5-8, 2005.
4. W. Zhang, X.G. Xia and P.C. Ching, "Achieving high-diversity in MB-OFDM systems," in Proc. IEEE Wirelesscom 2005, Maui, Hawaii, USA, vol. II, pp. 1343 - 1347, June 13-16, 2005.
5. Y.T. Chan, S.Y. Tao and P.C. Ching, "Approximate maximum likelihood localization by AoA measurements and NLOS detection," in Proc. IEEE SPAWC 2005, Calgary, Alberta, Canada, pp. 233-246, July 11-13, 2005.
6. W. Zhang, X.G. Xia and P.C. Ching, "Universal space-frequency block coding for MIMO-OFDM systems," in Proc. Asia-Pacific Conference on Communications, Perth, Western Australia, pp. 227 - 231, October 3-5, 2005.
7. W. Zhang, X.G. Xia and P. C. Ching, "High-rate full-diversity space-time-frequency codes for MIMO multipath block-fading channels," in Proc. IEEE Globecom 2005, St. Louis, MO, USA, vol. III, pp. 1587 - 1591, nov. 28 - Dec. 2, 2005.
8. N.H. Zheng, C. Qin, Tan Lee and P.C.Ching, "CU2C: A dual-condition cantonese speech database for speaker recognition applications," in Proc. International Conference on Speech Databases and Assessment (Oriental-COCOSDA 2005), Jakarta, Indonesia, pp. 67 - 72, December 6-8, 2005.
Publications in 2004 2004
1. K.W.Cheung, H.C.So, W.K.Ma and Y.T.Chan, "Least squares algorithms for time-of-arrival-based mobile location," IEEE Trans. on Signal Processing, vol. 52, no. 4, pp. 1121 - 1128, April 2004.
2. W.K. Ma, P.C. Ching and B.N. Vo, "Crosstalk resilient interference cancellation in microphone arrays using Capon beamforming," IEEE Trans. on Speech and Audio Processing, vol. 12, no. 5, pp. 468 - 477, September 2004.
3. W.K. Ma, T.N. Davidson, K.M. Wong and P.C. Ching, "A block alternating likelihood maximization approach to multiuser detection," IEEE Trans. on Signal Processing, vol. 52, no. 9, pp. 2600 - 2611, September 2004.
4. W.K. Ma, P.C. Ching and Z. Ding, "Semidefinite relaxation based multiuser detection for M-ary PSK multiuser systems," IEEE Trans. on Signal Processing, vol. 52, no. 10, pp. 2862 - 2872, October 2004.
5. H.C.So and P.C. Ching, "Adaptive algorithm for direct frequency estimation," IEE Proc. - Radar, Sonar and Navigation, vol. 151, no. 6, pp. 359 - 364, December 2004.
6. L.Y. Ngan, Shan Ouyang and P.C. Ching, "Reduced-rank blind adaptive frequency-shift filtering For signal extraction," in Proc. IEEE ICASSP 2004, Montreal, Quebec, Canada, vol.II, pp. 653 - 656, May 2004.
7. W. Zhang, X.G. Xia, P.C. Ching and W.K.Ma, "On the number of pilots for OFDM system in multipath fading channels," in Proc. IEEE ICASSP 2004, Montreal, Quebec, Canada, vol.IV, pp. 381 - 384, May 2004.
8. W.K.Ma, P.C. Ching, T.N. Davidson and B.N. Vo, "Blind symbol identifiability of orthogonal space-time block codes," in Proc. IEEE ICASSP 2004, Montreal, Quebec, Canada, vol.IV, pp.821 - 824, May 2004.
9. W. Zhang, X.G. Xia and P.C. Ching, "On pilot pattern design for PSAM-OFDM system," in Proc. IEEE International Symposium on Circuits and Systems, Vancover, Canada, vol. V, pp.417 - 420, May 2004.
10. Y.T.Chan, W.Y.Tsui, H.C.So and P.C. Ching, "Time of arrival based localization under NLOS conditions," in Proc. IEEE SPAWC 2004, calgary, Canada, pp. 281 - 287, July 2004.
11. W. Zhang, X.G. Xia and P.C. Ching, "Clustered pilot tones for carrier frequency offset compensation in OFDM systems," in Proc. XII. European Signal Processing Conference, Vienna, Austria, pp. 901 - 904, September 2004.
12. W. Zhang, X.G. Xia and P.C. Ching, "A design of high-rate space-frequency codes for MIMO-OFDM systems," in Proc. IEEE Globecom 2004, USA, vol. I, pp. 209-213, november 2004.
Publications in 2003 2003
1. H.C.So and Y.T.Chan, "Analysis of an LMS algorithm for unbiased impulse response estimation," IEEE Trans. on Signal Processing, vol. 51, no. 7, pp. 2008 - 2013, July 2003.
2. W.K. Ma and P.C. Ching, "Asymptotic minimum bit error rate property of maximum-likelihood multiuser detection," IEEE Communications Letters, vol.7, no.9, pp.425 - 427, September 2003.
3. Shan Ouyang, P.C. Ching and Tan Lee, "Robust adaptive quasi-Newton algorithms for eigensubspace estimation," IEE Proc. on Vision, Image and Signal Processing, vol.150, no.5, pp.321 - 330, October 2003.
4. Y. Wu, H.C.So and P.C. Ching, "Joint time delay and frequency estimation via state-space realization," IEEE Signal Processing Letters, vol.10, no.11, pp.339 - 342, november 2003.
5. K.C. Ho and Y.T.Chan, "An unbiased estimator for bearings-only tracking and doppler-bearing tracking," in Proc. IEEE ICASSP 2003, USA, pp.V169-172, April 2003.
6. Y.T.Chan and K.C. Ho, "TDOA-SDOA estimation with moving source and receivers," in Proc. IEEE ICASSP 2003, USA, pp.V153-156, April 2003.
7. K.W.Cheung, H.C.So, W.K.Ma and Y.T.Chan, "Received signal strength based mobile positioning via constrained weighted least squares," in Proc. IEEE ICASSP 2003, USA, pp.V137-140, April 2003.
8. W.K.Ma and P.C. Ching, "Robust interference suppression and blind speech beamforming in room reverberant environments," in Proc. IEEE ICASSP 2003, Hong Kong SAR, pp.V.493 - V.496, , April 2003.
9. L.Y. Ngan, Y. Wu, H.C. So, P.C. Ching and S.W. Lee, "Joint time delay and pitch estimation for speaker localization," IEEE International Symposium on Circuits and Systems, Bangkok, vol. III, pp.722 - 725, May 2003.
10. W.K. Ma, P.C. Ching and Z. Ding, "Efficient relaxed maximum-likelihood MPSK multiuser detection using semidefinite programming," in Proc. IEEE SPAWC 2003, Rome, Italy, June 2003.
11. A.J. Song, G.Y. Wang, W.F. Su and X.G. XIA, "Unitary Alamouti code design from APSK signals with fast maximum-likehood decoding algorithm," in Proc. International Symposium on Information Theory (held in Yokohama, Japan), USA, pp. 210. June 2003.
12. Y.T Chan, C.H. Yau and P.C. Ching, "Linear and approximate maximum likelihood localization from TOA measurements," in Proc. Seventh International Symposium on Signal Processing and Its Appications, Paris, Francis, pp. 295 - 298, July 2003.
13. 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," in Proc. IEEE Globecom 2003, USA, vol. IV, pp. 2094 - 2098, December 2003.