Multiple-Input Multiple-Output Gaussian Broadcast Channels With Confidential Messages
Multiple-Input Multiple-Output Gaussian Broadcast Channels With Confidential Messages
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DOI：
10.1109/tit.2010.2054593
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发表时间：
2010-09-01
影响因子：
2.5
通讯作者：
Shamai (Shitz), Shlomo
中科院分区：
文献类型：
--
作者：
Liu, Ruoheng;Liu, Tie;Shamai (Shitz), Shlomo
研究了双接收多输入多输出(MIMO)高斯广播信道上的保密通信问题。发送器有两个独立的消息，每个消息都打算发送给其中一个接收器，但需要对另一个接收器保持渐近完全保密。令人惊讶的是，在矩阵功率约束下，这两个消息可以以各自的最大保密率同时传输。为了证明这一结果，重新访问了MIMO高斯窃听信道，并通过使用人工噪声(加性前缀信道)和随机入库的新编码方案提供了其保密容量的新表征。
This paper considers the problem of secret communication over a two-receiver multiple-input multiple-output (MIMO) Gaussian broadcast channel. The transmitter has two independent messages, each of which is intended for one of the receivers but needs to be kept asymptotically perfectly secret from the other. It is shown that, surprisingly, under a matrix power constraint, both messages can be simultaneously transmitted at their respective maximal secrecy rates. To prove this result, the MIMO Gaussian wiretap channel is revisited and a new characterization of its secrecy capacity is provided via a new coding scheme that uses artificial noise (an additive prefix channel) and random binning.