摘要
NB-IoT是一种新兴的蜂窝技术,能更好地为大连接、低功耗、低吞吐量、低设备成本、高延迟容忍度类型应用提供覆盖。较LTE系统而言,NB-IoT系统中的随机接入信道NPRACH进行了重新设计。通过与LTE系统进行对比,对NB-IoT系统中NPRACH的结构设计进行了详细分析,并提出了一种基于2-D FFT的NPRACH接收端检测算法。通过MATLAB进行仿真分析,得出在不同的覆盖等级下,该算法检测NPRACH Preamble漏检概率MDP低于0.05%,误检概率FAP低于0.1%,均满足标准规定的1%MDP和0.1%FAP指标,且到达时间估计错误ToA Error在-2.5~2.5μs范围内的概率高于95%。
NB-IoT is an emerging cellular technology that provides better coverage for applications with large connectivity,low power,low throughput,low device cost and high latency tolerance.Compared with Long Term Evolution(LTE)system,the Narrow-band Physical Random Access Channel(NPRACH)of NB-IoT system has been modified a lot.Therefore,the structure design of NPRACH in NB-IoT system is analyzed in detail by comparison with LTE system.And a 2-D FFT-based NPRACH receiver detection algorithm is proposed.Through MATLAB simulation analysis,the results show that under different coverage levels,the algorithm detects NPRACH Preamble missed detection probability of less than 0.05%Misdetection Probability(MDP),Alarm Probability(FAP)less than 0.1%,which meets the standard requirements of 1%MDP and 0.1%FAP indicator,and the probability of Time-of-arrival(ToA)Error in the range of-2.5~2.5μs is higher than 95%.
作者
李小文
屈元远
周述淇
牟泓彦
陈其荣
Li Xiaowen;Qu Yuanyuan;Zhou Shuqi;Mou Hongyan;Chen Qirong(Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)
出处
《电子技术应用》
2018年第9期99-103,共5页
Application of Electronic Technique
基金
重庆市重点产业共性关键技术创新专项(cstc2017zdcy-zdzx0030)
