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Degrees of Freedom of Rank-Deficient 2×2×2 MIMO Interference Networks

机译:秩不足的2×2×2 MIMO干扰网络的自由度

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We consider the degrees of freedom (DoF) of the 2 x 2 x 2 multiple-input multiple-output (MIMO) interference network with arbitrary antenna configuration and practical rank-deficiency. Different from existing researches on the 2 x 2 x 2 MIMO interference model, the antenna number can be arbitrarily different at the transmitters, relays and receivers simultaneously, and the ranks of the channel matrices can be arbitrarily different. The exact DoF sum of this scenario is obtained. For different configurations of antennas and ranks, the outer bound is proved mainly by the min-cut outer bound and the achievability is presented with effective schemes, which combine zero-forcing (ZF) scheme, ZF over broadcast channel, interference alignment in X channel, and aligned interference neutralization (AIN) to match the outer bound. The traditional AIN scheme is modified in this paper to maximize the utilization of signal space overlap. Some related earlier works can be seen as special cases of our research.
机译:我们考虑具有任意天线配置和实际秩缺陷的2 x 2 x 2多输入多输出(MIMO)干扰网络的自由度(DoF)。与关于2 x 2 x 2 MIMO干扰模型的现有研究不同,发射器,中继器和接收器的天线数量可以同时任意不同,并且信道矩阵的秩可以任意不同。获得此方案的准确DoF总和。对于天线和秩的不同配置,主要通过最小割的外部边界来证明外部边界,并通过有效的方案来提出可实现性,该方案结合了零强迫(ZF)方案,广播信道上的ZF,X信道中的干扰对准,并对齐干扰消除(AIN)以匹配外部边界。本文对传统的AIN方案进行了修改,以最大程度地利用信号空间重叠。一些相关的早期著作可以被视为我们研究的特例。

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