Imperial College London > Talks@ee.imperial > COMMSP Seminar > Generalized Signal Alignment: On the Achievable DoF for Multi-User MIMO Two-Way Relay Channels

Generalized Signal Alignment: On the Achievable DoF for Multi-User MIMO Two-Way Relay Channels

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Degrees of freedom (DoF) characterize the independent number of data streams the system can transmit and are thus a measure of asymptotic channel capacity at high signal-to-noise ratio (SNR). By integrating the concepts of interference alignment and physical-layer network coding, signal alignment (SA) is an attractive technique to manage the interference and enhance DoF of various MIMO two-way relay channels, Yet, SA is only applicable when the antenna configuration satisfies the condition N < 2M, where N and M are the numbers of antennas at the relay node and each source node, respectively. The DoF analysis of multi-user MIMO two-way relay channels remains open in general. In this talk, I will introduce a new transmission framework, generalized signal alignment (GSA) to analyze the achievable DoF for multi-user MIMO two-way relay channel at antenna configuration N >= 2M. The notion of GSA is to form network-coded symbols by aligning every pair of signals to be exchanged in a compressed subspace at the relay. We provide the necessary and sufficient condition to construct the relay compression matrix. Using GSA , we have revealed new antenna configurations for achieving the maximum DoF of several special cases of the considered channel model, including the K-user MIMO Y channel, the multi-pair MIMO two-way relay channel, the generalized MIMO two-way X relay channel, and the L-cluster MIMO multiway relay channel.

Speaker bio: Meixia Tao received the B.S. degree in electronic engineering from Fudan University, Shanghai, China, in 1999, and the Ph.D. degree in electrical and electronic engineering from Hong Kong University of Science and Technology in 2003. She is currently a Professor with the Department of Electronic Engineering, Shanghai Jiao Tong University, China. Her current research interests include caching and multicasting in content-centric wireless networks, resource allocation, interference management and coordination, MIMO techniques, and physical layer security. Dr. Tao is a member of the Executive Editorial Committee of the IEEE Transactions on Wireless Communications. She serves as an Editor for the IEEE Transactions on Communications and the IEEE Wireless Communications Letters. She was also on the Editorial Board of the IEEE Transactions on Wireless Communications from 2007 to 2011 and the IEEE Communications Letters from 2009 to 2012. She has served as the TPC chair of IEEE /CIC ICCC 2014 and as Symposium Co-Chair of IEEE ICC 2015 .

Dr. Tao is the recipient of the IEEE Heinrich Hertz Award for Best Communications Letters in 2013, the IEEE ComSoc Asia-Pacific Outstanding Young Researcher Award in 2009, and the International Conference on Wireless Communications and Signal Processing (WCSP) Best Paper Award in 2012.

This talk is part of the COMMSP Seminar series.

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