The conventional LoRa system is not able to sustain long-range communication over fading channels. To resolve the challenging issue, this paper investigates a two-hop opportunistic amplify-and-forward relaying LoRa system. Based on the best relay-selection protocol, the analytical and asymptotic bit error rate (BER), achievable diversity order, coverage probability, and throughput of the proposed system are derived over the Nakagamim fading channel. Simulative and numerical results show that although the proposed system reduces the throughput compared to the conventional LoRa system, it can significantly improve BER and coverage probability. Hence, the proposed system can be considered as a promising platform for low-power, long-range and highly reliable wireless-communication applications.

翻译：常规 LoRa 系统无法维持长距离通信, 而不是落后的频道。 为解决这个棘手的问题, 本文件调查了一个双机会机会式扩展和前向传输Lora系统。 基于最佳中继选择协议, 分析和无药可救的位误差率( BER ) 、 可实现的多样性顺序、 覆盖概率 和拟议系统的吞吐量, 是通过 Nakagamim 淡化的频道产生的。 模拟和数字结果显示, 尽管拟议的系统比传统的Lora 系统减少了吞吐量, 但它可以大幅提高BER 和覆盖概率。 因此, 拟议的系统可以被视为低功率、 远程 和高度可靠的无线通信应用的有希望平台 。