NB-IoT系统物理随机接入信道设计

[摘要] 提出了两种用于窄带物联网（NB-IoT）终端接入网络的物理随机接入信道（PRACH）的设计方案，包括多子载波PRACH方案和单子载波PRACH方案。多子载波 PRACH方案遵循长期演进（LTE）PRACH的设计原理，在PRACH带宽、子载波间隔以及Zadoff-Chu （ZC）序列的选取方面进行了重新设计，用以满足NB-IoT系统随机接入的需求；单子载波PRACH方案将终端全部功率集中在一个子载波上，可以提供更高的功率谱密度，更适合恶劣的无线信道环境下终端接入需求。从单子载波PRACH检测性能着手，结合仿真验证，给出满足NB-IoT系统随机接入的需求的单子载波PRACH设计方案。

[关键词] NB-IoT；PRACH；单子载波；多子载波

[Abstract] Two kinds of narrowband Internet of things (NB-IoT) physical random access channel (PRACH) design schemes are proposed in this paper, including multi-tone PRACH and single-tone PRACH. Multi-tone PRACH scheme follows long term evolution (LTE) PRACH design principle, and PRACH bandwidth, subcarrier spacing and the selection of Zadoff-Chu (ZC) sequence are redesigned to meet the requirements of random access in NB-IoT system. Single-tone PRACH with Tx power concentrated in a single subcarrier can provide higher power spectral density and is more suitable for terminal in harsh wireless channel environment. In this paper, a single-tone PRACH design scheme which is meet the requirements of random access in NB-IoT system is given based on the analysis and simulation verification of PRACH detection performance.

[Keywords] NB-IoT; PRACH; single-tone; multi-tone