Secrecy Analysis of CSI Ratio-Based Transmitter Selection with Unreliable Backhaul

TL;DR

This paper analyzes the secrecy performance of a multi-transmitter system with unreliable backhaul, proposing a novel transmitter selection scheme based on channel power gain ratios, and evaluates its effectiveness under different backhaul knowledge scenarios.

Contribution

It introduces a new transmitter selection scheme that accounts for backhaul unreliability and compares its performance with existing schemes under various knowledge conditions.

Findings

The proposed scheme improves secrecy performance when backhaul knowledge is used.

Unreliable backhaul limits the maximum secrecy performance achievable.

The scheme nearly matches optimal performance without needing noise power or exact secrecy rate evaluation.

Abstract

This paper explores the secrecy performance of a multi-transmitter system with unreliable backhaul links. To improve secrecy, we propose a novel transmitter selection (TS) scheme that selects a transmitter with the maximum ratio of the destination channel power gain to the eavesdropping channel power gain. The backhaul reliability factor is incorporated with the distribution of the channel power gain through the utilization of a mixture distribution. We evaluate the non-zero secrecy rate (NZR) and the secrecy outage probability (SOP) as well as their asymptotes in two scenarios of backhaul activity knowledge, where it is available and where it is unavailable. The results illustrate that because of the unreliable backhaul, the proposed destination-to-eavesdropper channel power gain ratio-based TS scheme is constrained in terms of secrecy performance. However, performance enhancements are observed when the backhaul knowledge activity is utilized. Furthermore, the proposed scheme outperforms all the sub-optimal TS schemes and achieves nearly optimal performance without requiring noise power or the evaluation of the exact secrecy rate measurement.