The problem of covert communication over Multiple-Input Multiple-Output (MIMO) Additive White Gaussian Noise (AWGN) channels is investigated, in which a transmitter attempts to reliably communicate with a legitimate receiver while avoiding detection by a passive adversary. The covert capacity of the MIMO AWGN is characterized under a variational distance covertness constraint when the MIMO channel matrices are static and known. The characterization of the covert capacity is also extended to a class of channels in which the legitimate channel matrix is known but the adversary's channel matrix is only known up to a rank and a spectral norm constraint.

中文翻译：

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变分距离约束下的隐蔽MIMO通信

研究了多输入多输出（MIMO）加性高斯白噪声（AWGN）通道上的秘密通信问题，其中，发送器尝试与合法接收器可靠地通信，同时避免被被动对手检测。当MIMO信道矩阵是静态的并且是已知的时，在变化距离隐蔽性约束下表征MIMO AWGN的隐蔽容量。隐性容量的表征也扩展到一类通道，在该类通道中已知合法通道矩阵，但仅在等级和频谱规范约束范围内才知道对手的通道矩阵。