Anti-Multipath Performance Improvement of an M-ary Position Phase Shift Keying Modulation System

Anti-Multipath Performance Improvement of an M-ary Position Phase Shift Keying Modulation System
复制标题

多位相移键控调制系统的抗多径性能改进

DOI:
10.3390/s19081938
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发表时间:
2019-04
期刊:
影响因子:
3.9
通讯作者:
Tian Hongxian
Tian Hongxian
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang Haiyuan;Tian Hongxian

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低功耗广域网(LPWAN)是物联网(IoT)在远距离、广覆盖场景下使用的技术。作为超窄带(UNB)调制技术之一,多进制位置相移键控(MPPSK)调制可以为LPWAN提供高覆盖和高可靠性。本文提出一种基于MPPSK调制的多径分离方法,旨在在不增加频谱开销和系统复杂度的情况下消除多径对主路径的影响。具体地,根据时延值调整系统的调制参数,使多径信号的相位跳变落在主路符号的相位跳变之外,实现多径与主径的分离。此外,为了减少使用多径信息进行决策时引入的噪声,提出了归一化符号联合决策方法。仿真结果表明,本文给出的多径分离条件能够满足MPPSK信号多径分离的要求。与现有主流判决方案相比,归一化符号联合判决提高了系统的解调性能。
Low-Power Wide-Area Network (LPWAN) is the technology that the Internet-of-Things (IoT) uses in long-distance, wide-coverage scenarios. As one of the ultra-narrowband (UNB) modulation techniques, M-ary position phase shift keying (MPPSK) modulation can provide high coverage and high reliability for LPWAN. This paper proposes a multipath separation method based on MPPSK modulation, which aims to eliminate the influence of multipath on the main path without increasing the spectrum overhead and system complexity. Specifically, the modulation parameter of the system is adjusted according to the delay value, so that the phase jump of the multipath signal falls outside the phase jump of the main path symbol to achieve separation of the multipath from the main path. Moreover, a normalized symbol joint decision method is proposed in order to reduce the introduced noise while using multipath information for decisions. The simulation results indicate that the multipath separation conditions given in this paper can meet the requirements of multipath separation of MPPSK signals. Compared with the existing mainstream decision scheme, the normalized symbol joint decision improves the demodulation performance of the system.
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