Investigation of LoRa Based Signal Code Constructions Noise Immunity

Long-range (LoRa) communication systems are actively used to implement the control and telemetry channels of unmanned aerial vehicles, due to its high noise immunity. However, existing solutions provide the main part of noise immunity due to the spreading of data symbols using a chirp modulation with frequency offset corresponding to symbols number, and a Hamming like code is used for encoding. The purpose of this work is to study the potential noise immunity of systems with LoRa modulation when using a non-binary LDPC code with error correction. Due to the implementation of decoding by a posteriori probabilities of receiving symbols, this algorithm allows for an increase potential noise immunity at a constant data transfer rate, which will increase the range of operation of unmanned aerial vehicle control systems.