The Role of Correlation in the Doubly Dirty Fading MAC with Side Information at the Transmitters

TL;DR

This paper analyzes how correlation between fading channels affects the performance of a doubly dirty fading MAC with side information, showing positive dependence improves outage probability and coverage, while negative dependence worsens them.

Contribution

It introduces a novel analysis using Copula theory to derive closed-form expressions for outage probability and coverage region under arbitrary dependence in the doubly dirty fading MAC.

Findings

Positive dependence improves outage probability and coverage.

Negative dependence degrades system performance.

Correlation structure significantly impacts MAC performance.

Abstract

We investigate the impact of fading correlation on the performance of the doubly dirty fading multiple access channel (MAC) with non-causally known side information at transmitters. Using Copula theory, we derive closed-form expressions for the outage probability and the coverage region under arbitrary dependence conditions. We show that a positive dependence structure between the fading channel coefficients is beneficial for the system performance, as it improves the outage probability and extends the coverage region compared to the case of independent fading. Conversely, a negative dependence structure has a detrimental effect on both performance metrics.