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Maximum-Rate Transmission With Improved Diversity Gain for Interference Networks

机译：干扰网络具有最大分集增益的最大速率传输

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摘要

Interference alignment (IA) was shown to be effective for interference management in improving transmission rate in terms of the degree of freedom (DoF) gain. On the other hand, orthogonal space-time block codes were widely used in point-to-point multiantenna channels to enhance transmission reliability in terms of the diversity gain. In this paper, we connect these two ideas, i.e., IA and space-time block coding, to improve the designs of alignment precoders for multiuser networks. Specifically, we consider the use of Alamouti codes for IA because of their rate-one transmission and achievability of full diversity in point-to-point systems. The Alamouti codes protect the desired link by introducing orthogonality between the two symbols in one Alamouti codeword, and create alignment at the interfering receiver. We show that the proposed alignment methods can maintain the maximum DoF gain and improve the ergodic mutual information in the long-term regime, while increasing the diversity gain to 2 in the short-term regime. The presented examples of interference networks have two antennas at each node and include the two-user X channel, the interfering multiaccess channel, and the interfering broadcast channel.
机译：事实证明，在自由度（DoF）增益方面，干扰对准（IA）对于改善传输速率的干扰管理是有效的。另一方面，正交空时分组码被广泛用于点对点多天线信道，以提高分集增益方面的传输可靠性。在本文中，我们将IA和空时分组编码这两个思想联系起来，以改进多用户网络的对齐预编码器的设计。具体来说，我们考虑将Alamouti码用于IA，因为它们的速率为1的传输以及在点对点系统中可实现全分集。 Alamouti码通过在一个Alamouti码字中的两个符号之间引入正交性来保护所需的链路，并在干扰接收机处创建对齐方式。我们表明，提出的比对方法可以在长期机制中保持最大自由度增益并改善遍历交互信息，而在短期机制中将多样性增益提高到2。所提出的干扰网络示例在每个节点处具有两个天线，并且包括两个用户X信道，干扰多址信道和干扰广播信道。

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