Performance Analysis of Physical Layer Key Generation Relying on Discrete Random Phase Injection

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Keshavarzi Mohammadreza; Kuhestani Ali

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Journal Paper

Paper Information

Journal: JOURNAL OF IRANIAN ASSOCIATION OF ELECTRICAL AND ELECTRONICS ENGINEERS Year:2024 | Volume:21 | Issue:3 Page(s): 47-58

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Information Journal Paper

Title

Performance Analysis of Physical Layer Key Generation Relying on Discrete Random Phase Injection

Author(s)

Keshavarzi Mohammadreza | Kuhestani Ali | Issue Writer Certificate

Keywords

Physical layer secret key generation

discrete random phase injection

guard bands

key disagreement rate

key discarding rate.

Abstract

Among physical layer security schemes, secret key generation schemes are efficient for sixth generation (6G) networks due to their desirable features and capabilities. In particular, schemes based on local random generators can be used to generate secret keys at a high rate. One of these schemes is the random phase injection scheme, in which the channel probe signals with random phase are exchanged between the communication parties (Alice and Bob). In this paper, a key generation scheme based on sending channel probe signals with discrete random phase and for peer to peer communications is presented. While introducing the quantization methods, the simple and practical "quantization with guard band (GB)" scheme is used for key extraction. Also, contrary to many studies, we assume that the legal channel suffers from weak channel reciprocity and noise also affects the received phase of Alice and Bob. For such a scenario, we provide expressions for the key mismatch rate (KMR) as well as the key discarding rate (KDR) per channel probe. Although increasing the GB range decreases the KMR metric, the length of the raw key sequence also shortens. In order to evaluate the effect of GB on the efficiency of the proposed key generation scheme, the raw key generation rate is defined and calculated. The simulation results confirm the analytical results and are useful for determining the power of the probe signal and the GB domain.

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