A Mock-Up of a Noise-Resilient Communication System with Non-Separable Data Factorial Coding

Abstract

The paper considers the construction of a mock-up of a noise-resilient information exchange system for inexpensive wireless devices operating in interference-saturated ISM bands. Based on the previously developed model of a noise-resilient information exchange system using a binary symmetric channel, a hardware-software system based on the SX1278 FSK/GFSK modem and the STM32 microcontroller family is implemented. The frame structure, the principles of forming service fields and useful data, frame synchronization and decoding algorithms that use a special sync block and majority processing by bit positions, as well as the features of their software implementation in conditions of limited memory resources and computing power are described in detail. The results of experimental evaluation of the prototype operation in the presence of intensive broadband interference, which simulate typical scenarios of spectrum sharing with other radio communication systems, household and industrial devices, are presented. It is shown that the proposed system provides correct message recovery, moderate frame processing time and reduced requirements for retransmissions. The results obtained can be used when designing industrial Internet of Things nodes, remote monitoring systems, meter reading collection and telemetry complexes in a noisy radio environment, and remote control of unmanned objects. The experimental data are in good agreement with the results of previous simulation modeling and confirm the feasibility of using a noise-tolerant information exchange system to build energy-efficient, scalable and reliable communication systems including three-pass cryptographic protokol. The resulting platform can serve as the basis for further optimization of data transformation in wireless networks