Adaptive Modulation with Impulsive Interference

TL;DR

This paper investigates how to adapt power and rate in wireless links affected by impulsive interference, revealing that traditional water-filling is suboptimal and proposing alternative schemes for better spectral efficiency.

Contribution

It introduces two simple adaptation schemes that outperform water-filling in impulsive interference channels, modeling interference as Bernoulli-Gaussian.

Findings

Water-filling is not optimal with impulsive interference.

Proposed schemes improve spectral efficiency.

Impulsive interference modeled as Bernoulli-Gaussian.

Abstract

In this letter, we analyze power and rate adaptation in a point-to-point link with Rayleigh fading and impulsive interference. We model the impulsive interference as a Bernoulli-Gaussian random process. Adaptation is used to maximize the average spectral efficiency by changing power and rate of the transmission subject to an average power and instantaneous probability of error constraints. Without impulsive interference, it is well known that water-filling is optimal for block fading. We provide two simple schemes that show that the conventional water-filling algorithm is not optimal in an impulsive interference channel.