Degrees of Freedom of 3-user MIMO Interference Channels with Instantaneous Relay Using Interference Alignment

• Wang Qiang,
• Shu Yuquan,
• Dong Minhua,
• Xu Ji,
• Tao Xiaofeng,

Vol. 9, No. 5, May 30, 2015
10.3837/tiis.2015.05.004, Download Paper (Free):

• interference alignment
• Neutralization
• Instantaneous Relay
• Degrees of Freedom
• energy efficient.

Abstract

Instantaneous relay (relay-without-delay) using interference alignment is a promising approach to neutralizing interference and improving system capacity. In Wang Chenwei's work, a 2-user scenario required both source and relay to access the global channel state information (CSI). This paper shows a new method of interference alignment improves the degrees of freedom (DoF) prominently for the 3-user MIMO interference channel with instantaneous relay. This new method is focused on the relay node that completes the is focused on the relay node that completes the mitigated. In addition, the 3-user MIMO interference channels with instantaneous relay can achieve 2M DoF when source and destination have M antennas, respectively. This method shows 33% improvement over the conventional method using interference alignment which obtains 3M / 2 DoF.

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