Inner Bound on the GDOF of the K-User MIMO Gaussian Symmetric Interference Channel

Mohapatra, Parthajit and Murthy, Chandra R (2013) Inner Bound on the GDOF of the K-User MIMO Gaussian Symmetric Interference Channel. In: IEEE TRANSACTIONS ON COMMUNICATIONS, 61 (1). pp. 187-196.

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Abstract

The K-user multiple input multiple output (MIMO) Gaussian symmetric interference channel where each transmitter has M antennas and each receiver has N antennas is studied from a generalized degrees of freedom (GDOF) perspective. An inner bound on the GDOF is derived using a combination of techniques such as treating interference as noise, zero forcing (ZF) at the receivers, interference alignment (IA), and extending the Han-Kobayashi (HK) scheme to K users, as a function of the number of antennas and the log INR/log SNR level. Several interesting conclusions are drawn from the derived bounds. It is shown that when K > N/M + 1, a combination of the HK and IA schemes performs the best among the schemes considered. When N/M < K <= N/M + 1, the HK-scheme outperforms other schemes and is found to be GDOF optimal in many cases. In addition, when the SNR and INR are at the same level, ZF-receiving and the HK-scheme have the same GDOF performance.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON COMMUNICATIONS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords:	Generalized degrees of freedom; interference channel; HK-scheme; interference alignment
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	21 Aug 2015 06:50
Last Modified:	21 Aug 2015 06:50
URI:	http://eprints.iisc.ac.in/id/eprint/52199

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