Full Duplex Joint Sensing for Opportunistic Access in Spectrum-Heterogeneous Cognitive Radio Networks

TL;DR

This paper introduces Full-Duplex Joint Sensing (FJDS), a novel spectrum sensing method in cognitive radio networks that uses in-band full duplex communication to enhance secondary user throughput while respecting primary user constraints.

Contribution

The paper proposes a new joint sensing mechanism, FJDS, utilizing full duplex communication for spectrum sharing in cognitive radio networks, which improves efficiency and spectrum utilization.

Findings

FJDS significantly increases secondary user throughput.

FJDS maintains primary user protection constraints.

Simulation confirms robustness across various parameters.

Abstract

In cognitive radio networks (CRN), secondary users (SUs) can share spectrum with licensed primary users (PUs). Because an SU receiver (SU-Rx) does not always share the same view of spectrum availability as the corresponding SU transmitter (SU-Tx), spectrum sensing conducted only by an SU transmitter tends to be overly sensitive to guarantee safe spectrum access at the price of SU inefficiency. In this letter, we propose a joint spectrum sensing mechanism, named Full-Duplex Joint Sensing (FJDS), to relax sensitivity of SU detection and improve SU throughput. FDJS employs instantaneous feedback enabled by in-band full duplex communication to facilitate the sharing of spectral information from SU-Rx to SU-Tx. The joint detection problem in FDJS is modeled as non-linear optimization and solved by a binary searching algorithm. Simulation results show that FDJS could improve SU throughput as well as meeting PU interruption constraints in a wide range of parameter settings.