Abstract

Most of current research on channel-based key generation focused on a time division duplex (TDD) system as the channel reciprocity factor applied directly to the generation of a secret key. However, most of commercial cellular systems rely on a frequency division duplex (FDD) mode. In this paper, we study the utilization of the uplink and downlink of FDD systems for the generation of common secret key between two users in the presents of inactive eavesdropper. The clue of our work is to explore the fading gain of the wireless channel between two users to generate a symmetric key. We develop the upper bound of the generation rate for shared key of the suggested mechanism and give numerical examples to show the performance of our suggested approach.

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