LoRa system and physical layer enhancement method based on intelligent reflective surface beam forming and index modulation

By combining intelligent reflective surface beamforming and index modulation technology in the LoRa system, the performance deterioration caused by the degradation of transmission quality and large-scale connections in the faded channel environment is solved, and high code error performance and high transmission throughput are improved.

CN119675713AActive Publication Date: 2025-03-21NORTHWEST UNIV
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Patent Information

Application Number
CN202411841758.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-13
Publication Date
2025-03-21
Estimated Expiration
2044-12-13

AI Technical Summary

Technical Problem

The transmission quality of the LoRa system is degraded in a faded channel environment, and the interference caused by large-scale connections deteriorates the system performance. The prior art has not yet effectively combined intelligent reflective surfaces and index modulation to improve the transmission throughput and code error performance of the LoRa system.

Method used

The LoRa system based on intelligent reflective surface beamforming and index modulation is adopted to control the phase of the passive reflective element through intelligent reflective surface RIS, maximize the instantaneous signal-to-noise ratio of the combination of reception antennas, and use multiple reception antennas for index modulation on the receiver side to activate Nk of the NR reception antennas for information transmission.

Benefits of technology

It significantly improves the code error performance and transmission throughput of the LoRa system, combines high transmission rate and high reliability, and effectively solves the packet conflict problem caused by large-scale connections, saves energy consumption, and improves the service life of low-power IoT nodes.

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Abstract

The invention provides a LoRa system and a LoRa physical layer enhancement method based on intelligent reflective surface beamforming and index modulation, in the system, a transmitting side at least comprises Nk LoRa nodes equipped with single transmitting antennas and an RIS with N passive reflective elements, the RIS is used for improving a wireless propagation environment, beamforming is realized by controlling the phase of each passive reflective element, and the LoRa physical layer enhancement method is used for enhancing the physical layer of the LoRa. The instantaneous signal-to-noise ratio under the antenna combination is activated to the maximum, and the bit error rate performance is improved; a receiver at least comprises a LoRa gateway equipped with NR receiving antennas, multiple receiving antennas at the LoRa gateway are used for index modulation, and Nk receiving antennas in the NR receiving antennas are activated in each symbol period and serve as information transmission entities to bear additional information, so that the transmission throughput is remarkably improved. According to the LoRa physical layer enhancement method applied to the LoRa system, the wireless propagation environment is controlled through RIS beam forming to improve the quality of received signals, and the spectrum efficiency is improved by ingeniously utilizing the IM principle of multiple receiving antenna indexes, so that the LoRa physical layer enhancement method has high transmission rate and high reliability.
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