IEEE 802.15.4g/4x-Based Orthogonal Frequency-Division Multiplexing Transmission Scheme for Wide-Area and Mobile IoT Communication Systems
IEEE 802.15.4g/4x-Based Orthogonal Frequency-Division Multiplexing Transmission Scheme for Wide-Area and Mobile IoT Communication Systems
复制标题
适用于广域和移动物联网通信系统的基于 IEEE 802.15.4g/4x 的正交频分复用传输方案
DOI：
10.1109/jiot.2021.3138055
复制
发表时间：
2022
影响因子：
10.6
通讯作者：
H. Harada
中科院分区：
文献类型：
--
作者：
Shun Kadoi;Hidetomo Ochiai;Ryota Okumura;Keiichi Mizutani;H. Harada
采用IEEE 802.15.4g标准的频移键控（FSK）方案的无线电通信系统可以实现低功耗和高可靠的通信，主要用于物联网（IoT）中的智能电表。然而，智能电表最近扩大了其应用范围，现在需要宽带和长途通信。为了满足这些要求，正交频分复用（OFDM）已被纳入IEEE 802.15.4g和802.15.4x标准。然而，目前还没有对OFDM在静态和多径衰落环境下的传输性能进行全面的分析。在这篇文章中，我们首先评估了OFDM的分组误码率（PER）假设固定通信使用计算机模拟。然后，我们评估了OFDM的传输距离，并表明OFDM可以在比IEEE 802.15.4g FSK规定的传输距离长3.0倍的情况下进行通信。其次，利用计算机模拟对移动通信环境下的PER进行了评估。当仅使用长训练场（LTF）来估计多径无线电信道时，即使在速度为几km/h的移动通信环境中，也无法达到所需的10%的PER。为了解决这个问题，我们提出了一种包含新的信道估计方案的接收方案。该方案先后利用LTF和插入发射机的导频信号来估计无线电传播特性。计算机仿真结果表明，即使在30 ~ 40 km/h的移动通信环境下，该方案也能达到要求的PER。
Radio communication systems using the frequency-shift keying (FSK) scheme standardized by the IEEE 802.15.4g standard can realize low-power consumption and highly reliable communications and are mainly adopted for smart metering as part of the Internet of Things (IoT). However, smart metering has recently broadened its application expectations, with broadband and long-distance communications now required. To fulfill these requirements, orthogonal frequency-division multiplexing (OFDM) has been incorporated into the IEEE 802.15.4g and 802.15.4x standards. However, comprehensive transmission performance analysis of OFDM under static and multipath fading environments has not been conducted. In this article, we first evaluated the packet error rate (PER) of OFDM assuming fixed communications using computer simulations. We then evaluated the transmission distance of OFDM and showed that OFDM can communicate at transmission distances up to 3.0 times longer than those specified in IEEE 802.15.4g FSK. Next, the PER in a mobile communication environment was evaluated using computer simulations. When only the long training field (LTF) was used to estimate multipath radio channels, the required PER of 10% was not achieved, even in a mobile communication environment at a speed of several km/h. To solve this problem, we proposed a receiving scheme which included a new channel estimation scheme. This scheme successively utilized not only the LTF but also pilot signals inserted into the transmitter to estimate radio propagation characteristics. Computer simulation results showed that the required PER was achieved even in a mobile communication environment at 30–40 km/h by using the proposed scheme.