Pilot contamination problem in multi-cell TDD systems

Authors:
Jubin Jose;Alexei Ashikhmin;Thomas L. Marzetta;Sriram Vishwanath
Affiliations:
Laboratory for Informatics, Networks and Communications, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX;Bell Laboratories, Alcatel-Lucent Inc., Murray Hill, NJ;Bell Laboratories, Alcatel-Lucent Inc., Murray Hill, NJ;Laboratory for Informatics, Networks and Communications, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX
Venue:
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 4
Year:
2009

Citing 3
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Abstract

This paper considers a multi-cell multiple antenna system with precoding at the base stations for downlink transmission. To enable preceding, channel state information (CSI) is obtained via uplink training. This paper mathematically characterizes the Impact that uplink training has on the performance of multi-cell multiple antenna systems. When non-orthogonal training sequences are used for uplink training, it is shown that the precoding matrix used by the base station in one cell becomes corrupted by the channel between that base station and the users in other cells. This problem of pilot contamination is analyzed in this paper. A multi-cell MMSE-based precoding is proposed that, when combined with frequency/time/pilot reuse techniques mitigate this problem.