A signal modulation method, demodulation method and LoRa communication system

CN121690270BActive Publication Date: 2026-06-26SOUTH SURVEYING & MAPPING INSTR
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH SURVEYING & MAPPING INSTR
Filing Date
2025-11-03
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

LoRa communication suffers from a low transmission rate, resulting in slow data exchange, increased latency, packet loss, and limited system reliability and scalability, making it difficult to meet users' needs for high-speed data communication.

Method used

The total bitstream to be transmitted is divided into multiple parts, each part corresponding to a spreading factor. Multiple frequency index values ​​are mapped to a set of frequency indices, and multiple LoRa signals are generated and superimposed to form the final transmitted signal. The receiving end recovers the bitstream through dechirp operation and discrete Fourier transform.

Benefits of technology

It significantly improves the transmission rate of LoRa modulation, shortens data transmission time, reduces channel occupancy, alleviates network congestion, increases system throughput and device connection density, and optimizes energy efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to a signal modulation method, a demodulation method and a LoRa communication system. A total bit stream is divided into a plurality of parts, and is mapped into a frequency index set through G frequency index values. G LoRa signals are generated according to corresponding spreading factors, and are superimposed to obtain a single multiplexing signal of the spreading factor. The single multiplexing signals of all the spreading factors are superimposed to obtain a transmission signal, and signal modulation is completed. The transmission signal is received. For each single multiplexing signal, a de-chirp operation and a discrete Fourier transform are sequentially performed to obtain a frequency domain signal of each spreading factor. G peak values with the largest amplitudes in each frequency domain signal are detected, and corresponding frequency index values are recorded. The frequency index set corresponding to each spreading factor is estimated according to the frequency index values, and the bit stream in the frequency index set is recovered through reverse mapping. All the recovered bit streams are combined to obtain a total bit stream, and signal demodulation is completed. The application maximizes the transmission rate while ensuring the reliability of LoRa communication.
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Citation Information

Patent Citations

  • Signal processing method, related equipment and LoRa wireless system

    CN110071886A

  • Chirp spread spectrum modulation non-orthogonal transmission method and transmission system based on frequency domain interference cancellation (FD-SIC)

    CN116827380A

  • Non-coherent long-range (LORA) communication system based on multiple-input multiple-output (MIMO) technology

    US20230155626A1