Resource Allocation for Secret Key Agreement Over Parallel Channels With Full and Partial Eavesdropper CSI
Resource Allocation for Secret Key Agreement Over Parallel Channels With Full and Partial Eavesdropper CSI
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DOI：
10.1109/tifs.2015.2455412
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发表时间：
2015-07
影响因子：
6.8
通讯作者：
S. Tomasin;A. Dall'Arche
中科院分区：
文献类型：
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作者：
S. Tomasin;A. Dall'Arche
我们考虑了通过并行加性高斯白噪声衰落信道连接的用户的密钥协商(SKA)信道模型的蒸馏阶段。Alice将二进制相移键控调制的随机比特发送给Bob，Bob选择具有高于给定阈值的对数似然比的比特子集，即，它们足够可靠。Alice具有关于她到窃听者Eve的信道的全部或部分信道状态信息(CSI)。本文的主要贡献是：1)推导了部分CSI时中断概率的表达式；2)在完全(部分)CSI场景中引入了(中断)密钥吞吐量(SKT)作为度量；3)推导了SKT的界；4)提出了一种新的功率分配和门限选择算法，该算法在中断概率约束下最大化SKT；5)通过用封闭形式的表达式逼近目标函数，得到了适合实际实现的次最优分配算法。此外，我们还证明了当功率分配和门限优化时，每个信道和联合SKA是等价的。
We consider the distillation phase of the secret key agreement (SKA) channel model for users connected through parallel additive white Gaussian noise fading channels. Alice sends binary phase shift keying modulated random bits to Bob who selects the subset of bits that have a log-likelihood ratio higher than a given threshold, i.e., they are sufficiently reliable. Alice has either full or partial channel state information (CSI) on her channel to the eavesdropper Eve. The main contributions of this paper are: 1) the derivation of the expression of outage probability when partial CSI is available; 2) the introduction of (outage) secret key throughput (SKT) as a metric in the full (partial) CSI scenario; 3) the derivation of SKT bounds; 4) the proposal of a new power allocation and threshold choice algorithm that maximizes the SKT under an outage probability constraint; and 5) the derivation of a suboptimal version of the allocation algorithm amenable for practical implementation obtained by approximating the objective functions with a closed-form expression. Moreover, we show that when power allocation and thresholds are optimized, per-channel and joint SKA are equivalent.