论文标题
在干扰存在下相干洛拉检测的优势
On the Advantage of Coherent LoRa Detection in the Presence of Interference
论文作者
论文摘要
已经表明，洛拉信号的相干检测仅在添加剂白色高斯噪声（AWGN）通道上提供约0.7 dB的边缘增益。但是，包括洛拉在内的基于Aloha的大规模物联网系统通常在干扰有限的政权中运作。因此，在这项工作中，我们检查了洛拉调制的性能，并在其他具有相同扩展因子的洛拉用户的干扰下进行了连贯的检测。我们得出了严格的符号和框架错误率表达式以及评估错误率的界限和近似值。将这些近似值预测的错误率与蒙特卡洛模拟发现的错误率进行了比较，并且证明非常准确。我们还将洛拉的性能与连贯和非连接的接收器进行了比较，我们表明，洛拉的连贯检测在干扰方案中比仅存在AWGN的情况更有利于。例如，我们表明，相干检测导致2.5 dB的增益比标准的非连锁检测，对于3 dB的信噪比（SIR），SIR为0 dB，最高为10 dB的增益。
It has been shown that the coherent detection of LoRa signals only provides marginal gains of around 0.7 dB on the additive white Gaussian noise (AWGN) channel. However, ALOHA-based massive Internet of Things systems, including LoRa, often operate in the interference-limited regime. Therefore, in this work, we examine the performance of the LoRa modulation with coherent detection in the presence of interference from another LoRa user with the same spreading factor. We derive rigorous symbol- and frame error rate expressions as well as bounds and approximations for evaluating the error rates. The error rates predicted by these approximations are compared against error rates found by Monte Carlo simulations and shown to be very accurate. We also compare the performance of LoRa with coherent and non-coherent receivers and we show that the coherent detection of LoRa is significantly more beneficial in interference scenarios than in the presence of only AWGN. For example, we show that coherent detection leads to a 2.5 dB gain over the standard non-coherent detection for a signal-to-interference ratio (SIR) of 3 dB and up to a 10 dB gain for an SIR of 0 dB.
