Permutation Trellis Coded Multi-level FSK Signaling to Mitigate Primary User Interference in Cognitive Radio Networks

TL;DR

This paper introduces a novel permutation trellis coded multi-level FSK signaling scheme to enhance secondary user performance in cognitive radio networks by mitigating primary user interference, ensuring stable throughput and improved link resiliency.

Contribution

It proposes a new coding and modulation approach combining PTC with multi-level FSK to improve SU robustness against dynamic PU interference in CRNs.

Findings

Achieves stable throughput under heavy PU interference

Enhances SU link resiliency to multiple dynamic PUs

Provides an approximation for Bit Error Rate using Viterbi decoder properties

Abstract

We employ Permutation Trellis Code (PTC) based multi-level Frequency Shift Keying signaling to mitigate the impact of Primary Users (PUs) on the performance of Secondary Users (SUs) in Cognitive Radio Networks (CRNs). The PUs are assumed to be dynamic in that they appear intermittently and stay active for an unknown duration. Our approach is based on the use of PTC combined with multi-level FSK modulation so that an SU can improve its data rate by increasing its transmission bandwidth while operating at low power and not creating destructive interference for PUs. We evaluate system performance by obtaining an approximation for the actual Bit Error Rate (BER) using properties of the Viterbi decoder and carry out a thorough performance analysis in terms of BER and throughput. The results show that the proposed coded system achieves i) robustness by ensuring that SUs have stable throughput in the presence of heavy PU interference and ii) improved resiliency of SU links to interference in the presence of multiple dynamic PUs.