论文标题
通过利用不对称时钟速率启用IoT的低功率OFDM
Enabling Low-Power OFDM for IoT by Exploiting Asymmetric Clock Rates
论文作者
论文摘要
传统的高速Wi-Fi最近已成为低功率Internet（IoT）通信的竞争者。 OFDM由于其频谱效率可以支持大量物联网连接的需求，因此继续在新的物联网Wi-Fi标准中采用。尽管物联网Wi-Fi标准提供了许多新功能来提高功率和频谱效率，但收发器设计的基本物理层（PHY）结构仍然符合其常规设计的基本原理，该访问点（AP）和客户使用相同的OFDM PHY。在本文中，我们认为当前的Wi-Fi PHY设计并不能充分利用AP和IoT之间的固有不对称性。为了填补空白，我们提出了一种不对称的设计，其中物联网设备使用最低功率传输上行链路数据包，同时将所有解码负担推向AP侧。这样的设计利用AP的足够功率和计算资源来交易物联网设备的传输（TX）功率。使这种不对称设计的核心技术是，AP具有高时钟速率的全部功能来提高解码能力。我们提供设计的实现，并表明当AP设置$ 8 \ times $时钟速率时，它可以降低物联网TX功率的88％。
The conventional high-speed Wi-Fi has recently become a contender for low-power Internet-of-Things (IoT) communications. OFDM continues its adoption in the new IoT Wi-Fi standard due to its spectrum efficiency that can support the demand of massive IoT connectivity. While the IoT Wi-Fi standard offers many new features to improve power and spectrum efficiency, the basic physical layer (PHY) structure of transceiver design still conforms to its conventional design rationale where access points (AP) and clients employ the same OFDM PHY. In this paper, we argue that current Wi-Fi PHY design does not take full advantage of the inherent asymmetry between AP and IoT. To fill the gap, we propose an asymmetric design where IoT devices transmit uplink packets using the lowest power while pushing all the decoding burdens to the AP side. Such a design utilizes the sufficient power and computational resources at AP to trade for the transmission (TX) power of IoT devices. The core technique enabling this asymmetric design is that the AP takes full power of its high clock rate to boost the decoding ability. We provide an implementation of our design and show that it can reduce up to 88% of the IoT's TX power when the AP sets $8\times$ clock rate.
