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On the Secure Degrees of Freedom of Two-way 2×2×2 MIMO Interference Channel
IEEE Transactions on Communications ( IF 8.3 ) Pub Date : 2020-01-01 , DOI: 10.1109/tcomm.2019.2948597
Ye Fan , Xiaodong Wang , Xuewen Liao

We investigate the secure degrees of freedom (SDoF) for the two-way $2\times 2\times 2$ MIMO interference channel (IC) under three wiretap models, i.e., the confidential messages (CM) model, the untrusted relays (UR) model, and the combined CM and UR (CM-UR) model. For the general case of arbitrary antenna configuration under each wiretap model, we derive the upper bound on SDoF with Markov chain and secrecy constraints, and obtain the achievability schemes with designed interference neutralization, cooperative jamming, and interference alignment schemes. To gain insight on these bounds, we further consider the special case where each user node has $M$ antennas and each relay node has $N$ antennas, and highlight the modification process when achieving the maximum SDoF. For such special case, we show that the optimum SDoF of the CM model is achieved in the regimes $M\ge N$ and $M < ({N}/{2})$ ; and for the UR model and CM-UR model, the optimum SDoF is achieved in the regimes $N\le ({M}/{2})$ , $N > 2M$ , and $N=M$ .

中文翻译:

关于双向2×2×2 MIMO干扰信道的安全自由度

我们研究了双向的安全自由度 (SDoF) $2\times 2\times 2$ 三种窃听模型下的MIMO干扰信道(IC),即机密消息(CM)模型、不可信中继(UR)模型和CM和UR组合(CM-UR)模型。对于每个窃听模型下任意天线配置的一般情况,我们推导出具有马尔可夫链和保密约束的SDoF的上限,并获得具有设计干扰中和、协同干扰和干扰对准方案的可实现性方案。为了深入了解这些界限,我们进一步考虑了每个用户节点都有的特殊情况 百万美元 天线和每个中继节点都有 $N$ 天线,并突出实现最大 SDoF 时的修改过程。对于这种特殊情况,我们证明了 CM 模型的最佳 SDoF 是在以下制度中实现的 $M\ge N$ $M < ({N}/{2})$ ; 对于 UR 模型和 CM-UR 模型,最佳 SDoF 在 $N\le ({M}/{2})$ , $N > 200 万美元 , 和 $N=M$ .
更新日期:2020-01-01
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