arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2102.09250eess.SP
收藏

LPWAN中的交替Chirp扩频技术

Alternative Chirp Spread Spectrum Techniques for LPWANs

Ivo Bizon Franco de Almeida, Marwa Chafii, Ahmad Nimr, Gerhard Fettweis

摘要:

Chirp扩频(CSS)是当前由长距离(LoRa)采用的调制技术,长距离(LoRa)是最突出的物联网无线通信标准之一。LoRa物理层(PHY)在频移键控的变体之上采用CSS,并且在接收器处采用非相干检测。虽然它在覆盖范围、数据速率和设备简单性之间提供了良好的权衡,但其最大可实现数据速率仍然是某些应用的限制因素。此外,当前的LoRa标准没有充分利用CSS通用情况,即,当要发送的数据以不同的波形参数编码时。因此,本文的目标是研究CSS的性能,同时探索不同的参数设置,旨在提高最大可实现的吞吐量,从而提高频谱效率。在最大似然估计的框架下,给出了相干和非相干接收算法的设计。对于实际的接收机设计,信道估计技术的公式也被提出。CSS的不同变体的性能评估进行检查的符号错误率作为一个函数的信号-噪声比连同最大可实现的吞吐量,每个方案可以实现。

英文摘要:

Chirp spread spectrum (CSS) is the modulation technique currently employed by Long-Range (LoRa), which is one of the most prominent Internet of things wireless communications standards. The LoRa physical layer (PHY) employs CSS on top of a variant of frequency shift keying, and non-coherent detection is employed at the receiver. While it offers a good trade-off among coverage, data rate and device simplicity, its maximum achievable data rate is still a limiting factor for some applications. Moreover, the current LoRa standard does not fully exploit the CSS generic case, i.e., when data to be transmitted is encoded in different waveform parameters. Therefore, the goal of this paper is to investigate the performance of CSS while exploring different parameter settings aiming to increase the maximum achievable throughput, and hence increase spectral efficiency. Moreover, coherent and non-coherent reception algorithm design is presented under the framework of maximum likelihood estimation. For the practical receiver design, the formulation of a channel estimation technique is also presented. The performance evaluation of the different variants of CSS is carried out by inspection of the symbol error ratio as a function of the signal-to-noise ratio together with the maximum achievable throughput each scheme can achieve.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑