【摘 要】
：
In recent years,LoRa has been extensively researched in the satellite Internet of Things(IoT).However,the multiple access technology of LoRa is still one of the bottlenecks of satellite IoT.To improve the multiple access performance of LoRa satellite IoT,
【机 构】
：
School of Electronics and Information Engineering,Harbin Institute of Technology,Harbin 150080,China
论文部分内容阅读
In recent years,LoRa has been extensively researched in the satellite Internet of Things(IoT).However,the multiple access technology of LoRa is still one of the bottlenecks of satellite IoT.To improve the multiple access performance of LoRa satellite IoT,based on the orthogonality of LoRa symbols in the fractional domain,this paper proposes a low complex-ity Orthogonal LoRa Multiple Access(OLMA)algo-rithm for multiple LoRa users occupying the same fre-quency bandwidth.The algorithm introduces the ad-dress code to divide the fractional bandwidth into mul-tiple parts,and the OLMA users with different address codes occupy different parts to transmit the informa-tion code,thus avoiding mutual interference caused by collisions in the same frequency bandwidth.The mul-tiple access capability of OLMA can be flexibly con-figured only by simply adjusting the length of the ad-dress code according to the actual application require-ments of data transmission.Theoretical analysis and simulation results show that the OLMA algorithm can greatly improve the multiple access capability and the total transmission bit rate of LoRa IoT without chang-ing the existing LoRa modulation parameters and pro-cess.
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