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Interference Alignment With Diversity for the 2 $,times,$ 2 X-Network With Four Antennas

机译:带四个天线的2个,$,$ 2 X网络的分集干扰对准

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摘要

A transmission scheme based on the Alamouti code, which we call the Li–Jafarkhani–Jafar (LJJ) scheme, was recently proposed for the 2 $,times,$ 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 $,times,$ 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.
机译:最近提出了一种基于Alamouti码的传输方案,我们将其称为Li–Jafarkhani–Jafar(LJJ)方案,用于2 x 2倍的X网络[即,两个发射器(Tx)两个接收器[X-network]在每个节点上都有两个天线。当在每个Tx上使用固定的有限星座图时,该方案被要求实现8/3的自由度和(DoF),并且分集增益为2。此外,与Jafar-Shamai方案不同,每个Tx只需要了解自己的通道,Jafar-Shamai方案要求全局CSIT来实现最大可能的总DoF为8/3。在本文中,我们将LJJ方案扩展到在每个节点上具有四个天线的2 x 2网络。所提出的方案还假设在每个Tx处仅本地信道知识。我们证明了所提出的方案实现了16/3的最大可能总和DoF。另外,我们还证明了,使用在每个Tx处具有适当旋转的任何固定的有限星座图,所提出的方案可实现至少4的分集增益。

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