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Interference Alignment With Diversity for the 2 x 2 X-Network With Four Antennas

Ganesan, Abhinav and Rajan, Sundar B (2014) Interference Alignment With Diversity for the 2 x 2 X-Network With Four Antennas. In: IEEE TRANSACTIONS ON INFORMATION THEORY, 60 (6). pp. 3576-3592.

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Official URL: http://dx.doi.org/ 10.1109/TIT.2014.2313614


A transmission scheme based on the Alamouti code, which we call the Li-Jafarkhani-Jafar (LJJ) scheme, was recently proposed for the 2 x 2 X-network i.e., two-transmitter (Tx) two-receiver X-network] with two antennas at each node. This scheme was claimed to achieve a sum degrees of freedom (DoF) of 8/3 and also a diversity gain of two when fixed finite constellations are employed at each Tx. Furthermore, each Tx required the knowledge of only its own channel unlike the Jafar-Shamai scheme which required global CSIT to achieve the maximum possible sum DoF of 8/3. In this paper, we extend the LJJ scheme to the 2 x 2 X-network with four antennas at each node. The proposed scheme also assumes only local channel knowledge at each Tx. We prove that the proposed scheme achieves the maximum possible sum DoF of 16/3. In addition, we also prove that, using any fixed finite constellation with appropriate rotation at each Tx, the proposed scheme achieves a diversity gain of at least four.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA.
Keywords: Wireless X-network; interference alignment; diversity; degrees of freedom; multiple-input multiple-output (MIMO)
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 08 Nov 2014 05:15
Last Modified: 08 Nov 2014 05:15
URI: http://eprints.iisc.ac.in/id/eprint/50178

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