SDR All-channels Receiver for FHSS Sensor Network in Cortex-M

Abstract

This article describes implementation of a special software defined receiver for a frequency hopping sensor network. The receiver is implemented on LPC4370 Cortex-M MCU with R820T2 RF demodulator. The resulting prototype can receive frequency modulated packet on any of 51 frequency channels. That enables star topology frequency hopping network to have unsynchronized sleeping sensors with fast reaction times. The principles explained in this article are valuable not only for this network, but as well for implementation of any software defined receiver with low cost and reasonable power consumption.