Multiuser MISO Downlink Transceiver Optimization: Beyond Beamforming and Perfect Channel State Information
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01 Sep, 2017 (Fri)
2:30 pm
Room 603, Chow Yei Ching Building

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Dr. Wing-Kin Ma
Associate Professor
Department of Electronic Engineering
The Chinese University of Hong Kong


In the multiuser MIMO scenario, transceiver design and optimization techniques have been known to be very powerful in enhancing system throughput and efficiency. This talk will cover several fundamental issues in this topic and the speaker’s recent works. The first topic considers physical-layer MISO multicasting, or common information broadcast to multiple users. In this context one usually adopts beamforming, optimized via a powerful method called semidefinite relaxation (SDR). We do this rethinking: can we obtain better designs by altering the physical-layer transceiver architecture itself? We will introduce a novel transceiver strategy called stochastic beamforming (SBF)—which adopts a random-in-time beamforming strategy—that can outperform SDR-based beamforming and reveals new insights. The second topic considers robust unicast beamforming. Curiously, simulation results have suggested that SDR admits a rank-one solution to the aforementioned problem—or solves the problem optimally—in most instances. This gives rise to a fundamentally important question, namely, whether we can theoretically identify conditions under which the robust problem admits a rank-one solution. A latest theoretical breakthrough by the speaker and his collaborators will be described.


Biography of the speaker:

Wing-Kin (Ken) Ma is an Associate Professor with the Department of Electronic Engineering, The Chinese University of Hong Kong. His research interests are in signal processing, communications and optimization, with recent activities focused on MIMO transceiver designs and interference management, blind signal processing and structured matrix factorization, and hyperspectral remote sensing. Dr. Ma is active in the Signal Processing Society. He is currently a Senior Area Editor of IEEE Transactions on Signal Processing and previously served as editors of several journals, e.g., IEEE Signal Processing Magazine as the Lead Guest Editor of a special issue. He is a Member of the Signal Processing Theory and Methods (SPTM) Technical Committee and the Signal Processing for Communications and Networking (SPCOM) Technical Committee. He received Research Excellence Award 2013–2014 by CUHK, the 2015 IEEE Signal Processing Magazine Best Paper Award, and the 2016 IEEE Signal Processing Letters Best Paper Award. His students received ICASSP Best Student Paper Awards in 2011 and 2014. He is an IEEE Fellow.


All are welcome.


Dr. K.B. Huang

The seminars are open to the general public, free of charge, unless otherwise stated. Registration is not required. Arrangement for car parking facilities on campus please contact us for details.

For enquiries, please contact:
Department of Electrical and Electronic Engineering,
Room 601, Chow Yei Ching Building,
Pokfulam Road, Hong Kong
Tel: (852) 2859 7093