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首页> 外文期刊>IEEE transactions on wireless communications >Secret Key Generation Based on Estimated Channel State Information for TDD-OFDM Systems Over Fading Channels
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Secret Key Generation Based on Estimated Channel State Information for TDD-OFDM Systems Over Fading Channels

机译：基于估计信道状态信息的TDD-OFDM系统衰落信道上的秘密密钥生成

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摘要

One of the fundamental problems in cryptography is the generation of a common secret key between two legitimate parties to prevent eavesdropping. In this paper, we propose an information-theoretic secret key generation (SKG) method for time division duplexing (TDD)-based orthogonal frequency-division multiplexing (OFDM) systems over multipath fading channels. By exploring physical layer properties of the wireless medium, i.e., the reciprocity, randomness, and privacy features of the radio channel, an SKG method is proposed to maximize the number of secret bits given a target secret key disagreement ratio (SKDR). In the proposed SKG method, the phase information of the estimated channel state information (CSI) is distilled for SKG, and a special guard band (GB) scheme is designed to achieve the target SKDR with a small phase information loss. The proposed GB consists of both the amplitude GB (AGB) and phase GB (PGB), where the AGB is determined by the average signal-to-interference plus noise ratio (SINR), whereas the PGB adapts itself to the instantaneous SINR and thus incurs a smaller phase information loss in the higher SINR region. Analyses show that this GB scheme trades off a small loss of channel phase information for a better SKDR performance, and achieves a much larger number of quantization levels for a given SKDR due to the fact that the PGB decreases quickly as the SINR increases. Based on the performance analysis on the SKDR, the average secret key length, the phase information loss percentage (PILP), and the optimal GB and quantization level of the adaptive quantizor are derived for a given target SKDR. Both analytical and simulation results are presented to demonstrate the superiority of the proposed scheme for TDD-OFDM systems over frequency-selective fading channels.
机译：密码学中的基本问题之一是在两个合法方之间生成公用密钥以防止窃听。在本文中，我们提出了一种信息理论密钥生成（SKG）方法，用于基于时分双工（TDD）的多径衰落信道上的正交频分复用（OFDM）系统。通过研究无线介质的物理层属性，即无线电信道的互易性，随机性和隐私特征，提出了一种SKG方法，以在给定目标密钥不一致率（SKDR）的情况下最大化秘密位数。在提出的SKG方法中，为SKG提取了估计的信道状态信息（CSI）的相位信息，并设计了一种特殊的保护带（GB）方案以实现具有较小相位信息损失的目标SKDR。拟议的GB由幅度GB（AGB）和相位GB（PGB）组成，其中AGB由平均信号干扰加噪声比（SINR）确定，而PGB可以适应瞬时SINR，因此在较高的SINR区域中导致较小的相位信息丢失。分析表明，由于PGB随着SINR的增加而迅速降低，因此该GB方案在信道相位信息的少量损失之间进行权衡以获得更好的SKDR性能，并为给定的SKDR实现了更多的量化级别。根据对SKDR的性能分析，得出给定目标SKDR的平均密钥长度，相位信息丢失百分比（PILP）以及自适应量化器的最佳GB和量化级别。分析和仿真结果均被证明，以证明所提出的TDD-OFDM系统方案优于频率选择衰落信道。

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