Expedited Neighbor Discovery in Directional Terahertz Communication Networks Enhanced by Antenna Side-Lobe Information
Expedited Neighbor Discovery in Directional Terahertz Communication Networks Enhanced by Antenna Side-Lobe Information
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DOI：
10.1109/tvt.2019.2924820
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发表时间：
2019-06
影响因子：
6.8
通讯作者：
Qing Xia;J. Jornet
中科院分区：
文献类型：
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作者：
Qing Xia;J. Jornet
太赫兹（THz）频段（0.1 - 10太赫兹）通信被视为未来十年的关键无线技术，能够在6G系统中支持每秒太比特级的无线链路。太赫兹通信具有极大的带宽（数十至数百吉赫兹），但代价是极高的路径损耗（数米以上距离损耗大于100分贝）。因此，为建立可靠的通信链路，在发射和接收时始终都需要同时使用高定向天线（DAs）。高定向天线的应用给邻居发现过程带来了新的挑战。本文提出了一种适用于太赫兹频段通信网络的高效邻居发现协议。该协议利用完整的天线辐射方向图来检测一系列有效信号，并将其映射到通用信号模式，以此指示信号源的潜在方向，从而加快邻居发现过程。本文构建了一个数学框架，用于比较在自由空间中有无天线旁瓣信息的邻居发现协议。利用X60测试平台对所提出的邻居发现协议进行了验证。此外，还对该协议在有界空间（如方形房间）内的可行性进行了分析。数值结果表明，与仅使用主瓣信息的传统邻居发现协议相比，所提协议在性能上有显著提升。
Terahertz (THz)-band (0.1–10 THz) communication is envisioned as a key wireless technology of the next decade, able to support wireless Terabit-per-second links in 6G systems. THz communication exhibits an extremely large bandwidth (tens to hundreds of GHz) at the cost of a very high path loss ($>$100 dB for distances beyond a few meters). Therefore, highly directional antennas (DAs) are needed simultaneously in transmission and reception at all times to establish reliable communication links. The application of highly DAs introduces new challenges in the neighbor discovery process. In this paper, a time-efficient neighbor discovery protocol for THz-band communication networks is proposed. The protocol expedites the neighbor discovery process by leveraging the full antenna radiation pattern to detect a series of effective signals and map them to the universal signal patterns, which indicate the potential direction of the signal source. A mathematical framework is developed to compare the neighbor discovery protocols with and without the antenna side-lobes information in free space. The X60 testbed is utilized to validate the proposed neighbor discovery protocol. Furthermore, a feasibility analysis of the proposed protocol inside a bounded space (e.g., a square room) is conducted. Numerical results are presented to illustrate the performance improvements achieved by the proposed protocol when compared to the traditional neighbor discovery protocols with only main-lobe information.