Dianzi Jishu Yingyong (Sep 2018)

NB-IoT physical random access analysis and receiver detection algorithm

  • Li Xiaowen,
  • Qu Yuanyuan,
  • Zhou Shuqi,
  • Mou Hongyan,
  • Chen Qirong

DOI
https://doi.org/10.16157/j.issn.0258-7998.174994
Journal volume & issue
Vol. 44, no. 9
pp. 99 – 103

Abstract

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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 -2.5~2.5 μs is higher than 95%.

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