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Electrical and Computer Engineering

Speaker: Alexei Ashikhmin
Communications and Statistical Department
Bell Labs

Pilot Contamination Precoding for Large-scale Antenna Systems (LSAS)

Tuesday, January 29, 2013
4:00 PM  to 5:00 PM

1070  George R. Brown Hall
Rice University
6100 Main St
Houston, Texas, USA

Inter-cell interference (ICI) in Multi-Cell Multi-User TDD systems,resulted from unavoidable reuse of pilot sequences across cells,bounds the performance of large-scale antenna systems (LSAS) in the infinite antenna regime. A new concept, called pilot contamination precoding (PCP), was recently proposed to cancel ICI. The main idea of PCP is that each base station linearly combines messages aimed to terminals from different cells that re-use the same pilot sequence. Crucially, the combining coefficients depend only on the slowfading coefficients between the terminals and the base stations. PCP allows building Multi-Cell LSAS in which SINR grows linearly with the number of base station antennas.

In this work, we consider PCP design in the finite antenna regime,where three other types of interference become prominent. A balance among four types of interference is required. We formulate the PCP design as maximizing the minimum signal to interference-plus-noise ratio (SINR) subject to network sum power constraint. We further propose several algorithms for solving this max-min problem. Our simulation results show that in Linear Wyner-type cellular model with M=100 base station antennas the proposed algorithm give very significant, about 400 times, improvement in data transmission rate for 95% of users.

Hosts: Lin Zhong and Clay Shepard

Biography of Alexei Ashikhmin:
Alexei Ashikhmin is a research scientist in the Communications and Statistical Sciences Department, Bell Labs, Murray Hill, New Jersey. Alexei Ashikhmin's research interests include communications theory, classical and quantum information theory, and the theory of error correcting codes. From 2003 to 2006 Dr. Ashikhmin served as an Associate Editor for IEEE Transactions on Information Theory. In 2011 he was invited and accepted the invitation to serve as an Associate Editor of this journal again.

In 2004 Dr. Ashikhmin received S.O.Rice Award for the best paper of IEEE Transactions on Communications. In 2002, 2010, and 2011 Dr. Ashikhmin received Bell Laboratories President Awards for breakthrough research in wired and wireless communication projects

In 2005-2007 Alexei Ashikhmin was an adjunct professor at Columbia University. He taught courses "Communications Theory" and "Error Correcting Codes".

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