  Web spectrum monitoring systems based on crowdsourcing have recently gained
popularity. These systems are however limited to applications of interest for
governamental organizationsor telecom providers, and only provide aggregated
information about spectrum statistics. Theresult is that there is a lack of
interest for layman users to participate, which limits its
widespreaddeployment. We present Electrosense+ which addresses this challenge
and creates a general-purpose and open platform for spectrum monitoring using
low-cost, embedded, and software-defined spectrum IoT sensors. Electrosense+
allows users to remotely decode specific parts ofthe radio spectrum. It builds
on the centralized architecture of its predecessor, Electrosense,
forcontrolling and monitoring the spectrum IoT sensors, but implements a
real-time and peer-to-peercommunication system for scalable spectrum data
decoding. We propose different mechanismsto incentivize the participation of
users for deploying new sensors and keep them operational inthe Electrosense
network. As a reward for the user, we propose an incentive accounting
systembased on virtual tokens to encourage the participants to host IoT
sensors. We present the newElectrosense+ system architecture and evaluate its
performance at decoding various wireless sig-nals, including FM radio, AM
radio, ADS-B, AIS, LTE, and ACARS.
