Imperial College London > Talks@ee.imperial > COMMSP Seminar > Beamforming design for Multiuser MIMO downlink using signal-to-leakage ratios

Beamforming design for Multiuser MIMO downlink using signal-to-leakage ratios

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In the downlink transmission of a multi-user multiple-input multiple-output (MU-MIMO) system, the base station needs to communicate with multiple users simultaneously using the same bandwidth and time allocation. With multiple antennas at both transmitter and receiver, the transmission can be coordinated to allow spatial multiplexing, whereby multiple independent data subchannels are transmitted over the channel concurrently, creating a tremendous growth in sum capacity. Due to the fact that the signal intended for a particular user also acts as interference to other users, the main challenge is therefore to design precoding techniques to mitigate the co-channel interference (CCI). There have been numerous works carried out to cancel the CCI in a MU-MIMO downlink system. However, these methods are based upon perfect interference cancellation which imposes a tight constraint on the number of antennas. This limitation is avoided through schemes that rely on interference minimization using the signal-to-leakage ratio (SLR). In our talk, we explain the ideas behind the SLR approach and present different SLR -based algorithms. Extensions of the SLR approach to account for imperfect channel state information at the base station are also described.

Biography: Mounir Ghogho received his PhD degree in 1997 from the National Polytechnic Institute (INP), Toulouse, France. He was a Royal Academy of Engineering Research Fellow from Sept 2000 to Aug 2005. He currently holds a personal Chair in Signal processing and Communications at the school of Electronic and Electrical Engineering of the University of Leeds. He served as an Associate Editor of the IEEE Signal Processing Letters from 2001 to 2004. He is currently an Associate Editor of the IEEE Trans on Signal Processing and a member of both the IEEE SPTM and SPCOM Technical Committees. His research interests are in statistical signal processing, communications and networking. More details about his research group can be found at http://spcom.leeds.ac.uk

This talk is part of the COMMSP Seminar series.

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