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On the generalized degrees of freedom of the K-user symmetric MIMO Gaussian interference channel

Mohapatra, Parthajit and Murthy, Chandra R (2011) On the generalized degrees of freedom of the K-user symmetric MIMO Gaussian interference channel. In: 2011 IEEE International Symposium on Information Theory Proceedings (ISIT), July 31 2011-Aug. 5 2011, St. Petersburg.

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Official URL: http://dx.doi.org/10.1109/ISIT.2011.6033946

Abstract

This work derives inner and outer bounds on the generalized degrees of freedom (GDOF) of the K-user symmetric MIMO Gaussian interference channel. For the inner bound, an achievable GDOF is derived by employing a combination of treating interference as noise, zero-forcing at the receivers, interference alignment (IA), and extending the Han-Kobayashi (HK) scheme to K users, depending on the number of antennas and the INR/SNR level. An outer bound on the GDOF is derived, using a combination of the notion of cooperation and providing side information to the receivers. Several interesting conclusions are drawn from the bounds. For example, in terms of the achievable GDOF in the weak interference regime, when the number of transmit antennas (M) is equal to the number of receive antennas (N), treating interference as noise performs the same as the HK scheme and is GDOF optimal. For K >; N/M+1, a combination of the HK and IA schemes performs the best among the schemes considered. However, for N/M <; K ≤ N/M+1, the HK scheme is found to be GDOF optimal.

Item Type: Conference Proceedings
Additional Information: Copyright of this article belongs to IEEE.
Keywords: Generalized Degrees of Freedom; Interference Channel; MIMO; Capacity Bounds
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Depositing User: Id for Latest eprints
Date Deposited: 01 Apr 2013 07:33
Last Modified: 01 Apr 2013 07:33
URI: http://eprints.iisc.ac.in/id/eprint/46139

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