Covert communication with beamforming over MISO channels in the finite blocklength regime
Covert communication with beamforming over MISO channels in the finite blocklength regime
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DOI：
10.1007/s11432-019-2919-5
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
Xinchun Yu;Yuan Luo;Wen Chen
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文献类型：
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作者：
Xinchun Yu;Yuan Luo;Wen Chen
本文研究了有限块长多输入单输出（MISO）信道上的隐蔽通信波束形成技术。我们首先证明了在复高斯信道上隐蔽通信的最优输入分布是圆对称复高斯。通过回顾我们以前关于高斯随机编码在加性白色高斯噪声（AWGN）信道上的吞吐量的结果，分析了MISO信道上可达吞吐量的可扩展性和匡威界。然后，最佳波束形成策略及其与发射功率的关系进行了深入研究，在各种情况下，在系统的两端可用的几种类型的信道状态信息。我们揭示了一个事实，即最大允许发射功率不受隐蔽性要求时，有完整的信道信息的对手，而有一个上限的发射功率是基于波束成形和基于中断的隐蔽性标准，如果只有部分信道信息的对手。数值结果表明，在MISO信道中采用适当的波束形成策略，与单天线情况相比，可以显著提高隐蔽通信的吞吐量.
This paper considers beamforming techniques for covert communication over multiple input single output (MISO) channels with finite blocklength. We first show that the optimal input distribution for covert communication over complex Gaussian channels is circular symmetric complex Gaussian. By reviewing our previous results on the throughput of Gaussian random coding over additive white Gaussian noise (AWGN) channels, the achievability and converse bounds on the attainable throughput over MISO channels are analyzed. Then, the optimal beamforming strategies and their relationship with the transmitting power are thoroughly investigated in a variety of situations in terms of several types of channel state information available at both ends of the system. We reveal the fact that the maximal allowable transmit power is not constrained by covertness requirement when there is full channel information of the adversary, while there is an upper bound of the transmit power which is based on beamforming and an outage-based covertness criterion if there is only partial channel information of the adversary. Finally, numerical results are presented to show that the throughput of covert communication can be increased notably by adopting a proper beamforming strategy in MISO channels in comparison with the single antenna case.