Low-SNR Analysis of Interference Channels under Secrecy Constraints

TL;DR

This paper analyzes the impact of secrecy constraints on the energy efficiency and optimal transmission schemes in low-SNR interference channels, revealing that secrecy introduces penalties and that TDMA often outperforms multiplexed schemes.

Contribution

It provides a detailed low-SNR analysis of secrecy rates in interference channels, identifying conditions where TDMA is optimal under secrecy constraints.

Findings

Secrecy constraints increase minimum bit energy and reduce the wideband slope.

TDMA is generally more optimal than multiplexed schemes under secrecy constraints.

The paper characterizes the conditions favoring TDMA or multiplexed transmission in low-SNR regimes.

Abstract

In this paper, we study the secrecy rates over weak Gaussian interference channels for different transmission schemes. We focus on the low-SNR regime and obtain the minimum bit energy E_b/N_0_min values, and the wideband slope regions for both TDMA and multiplexed transmission schemes. We show that secrecy constraints introduce a penalty in both the minimum bit energy and the slope regions. Additionally, we identify under what conditions TDMA or multiplexed transmission is optimal. Finally, we show that TDMA is more likely to be optimal in the presence of secrecy constraints.