LoRa同步叠加信号的解调

为了提高LoRa技术单位时间内的传输速率，提出了一种新的LoRa同步叠加信号解调算法。首先，理论分析了相同扩频信道LoRa叠加信号解调的核心问题是区分不同节点的信号，仿真分析了当2个节点信号的功率差大于5 dB时，即可解调出2个节点的数据并指出了该方法的不足之处；其次，提出了一种使用LoRa调制符号的最高位为标志位，作为区分2个节点数据的新算法，指明了该算法的使用场景并发现它与LoRa技术解调算法的复杂度基本相同。仿真结果表明，新算法不会增加LoRa解调算法的误比特率，与LoRa技术解调算法相比，新算法大幅度提高了LoRa数据包的传输速率并降低了传输有效信息的比特能耗。

Demodulation of LoRa Synchronous Superposition Signals

In order to improve the transmission rate of LoRa technology, a new demodulation algorithm for LoRa synchronous superimposed signals is proposed. In this paper, we first theoretically find that the core problem of demodulation of LoRa superposition signals in the same expansion frequency channel is to distinguish the signals of different nodes, and if the power difference of two nodes is greater than 5 dB, the data of the two nodes can be demodulated. Moreover, the disadvantages of the method are also indicated. Second, we propose a algorithm of using the LoRa modulation symbol as the highest marker bit to distinguish the data of two nodes, indicate the application scenario of the algorithm, and prove that it has the same complexity as the demodulation algorithm of LoRa technique. Simulation results show that the new algorithm will not increase the bit error rate of the LoRa demodulation algorithm, and compared with the demodulation algorithm of LoRa technology, the new algorithm greatly improves the transmission rate of LoRa packets and reduces the bit energy consumption of transmitting effective information.