This invention provides a LoRa
system based on intelligent reflective surface
beamforming and index modulation, and a LoRa
physical layer enhancement method. In this
system, the
transmitter includes at least: N k A LoRa node equipped with a single transmit antenna and a RIS with N passive reflective elements. The RIS is used to improve the
wireless propagation environment by controlling the phase of each passive reflective element to achieve
beamforming, maximizing the instantaneous
signal-to-
noise ratio under the
active antenna combination, and improving
bit error rate performance; the
receiver includes at least N... R A LoRa gateway with multiple receiving antennas, where multiple receiving antennas at the LoRa gateway are used for indexed modulation, activating N antennas in each
symbol period. R N of the receiving antennas k By using these individual antennas as
information transmission entities to carry additional information, the
transmission throughput is significantly improved. The LoRa
physical layer enhancement method applied to this LoRa
system improves the quality of received signals by controlling the
wireless propagation environment through RIS
beamforming, and cleverly utilizes the IM principle of multi-
receiver antenna indexing to improve
spectral efficiency, thus achieving both
high transmission rate and high reliability.