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2021 Fiscal Year Annual Research Report

Research on Coding for Large-Scale Sensor Networks

Research Project

Project/Area Number 18K04132
Research InstitutionGifu University

Principal Investigator

LU SHAN  岐阜大学, 工学部, 助教 (30755385)

Co-Investigator(Kenkyū-buntansha) 程 俊  同志社大学, 理工学部, 教授 (00388042)
Project Period (FY) 2018-04-01 – 2022-03-31
Keywordsunsourced random access
Outline of Annual Research Achievements

In the unsourced random access (U-RA), many users with only a certain number are active in the same time slot. Each user employs the same codebook, and the task of the decoder is to recover a list of transmitted messages regardless of the user's identity. The compressed sensing(CS) approach is straightforward but with high computational complexity in addressing the U-RA problem.
A concatenated coding approach called a coded compressed sensing scheme is a low complexity method that splits each message into L sub-slots. First, an outer tree code connects the messages of all sub-slots. Then, the active users send a column from an inner CS matrix in each sub-slot. However, there is a limitation that the inner CS decoding only decodes the support of a sparse vector, which leads to each user at the same sub-slot must send a different message, and the maximum tolerable active user number is low.

We consider the inner CS decoding scheme that first decodes the amplitudes of a sparse vector and quantity them to show the number of active users choosing the same columns. Therefore, the constraint of each user sending different messages at the same sub-slot vanishes, and the maximum tolerable number of active users increases. We show the maximum tolerable active user number with various codelengths and improve the survival probabilities' upper and lower bounds of the outer tree encoder.

  • Research Products

    (6 results)

All 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (5 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] User Identification and Channel Estimation by Iterative DNN-Based Decoder on Multiple-Access Fading Channel2022

    • Author(s)
      WEI Lantian、LU Shan、KAMABE Hiroshi、CHENG Jun
    • Journal Title

      IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

      Volume: E105.A Pages: 417~424

    • DOI

      10.1587/transfun.2021tap0008

    • Peer Reviewed
  • [Presentation] Access Point Placement for Indoor Wireless LAN2021

    • Author(s)
      Yuma Narita, Shan Lu, Hiroshi Kamabe
    • Organizer
      The 25th World Multiconference on Systemics, Cybernetics and Informatics,
    • Int'l Joint Research
  • [Presentation] Rate-compatible LDPC Code in Dynamic Environment based on Reinforcement Learning2021

    • Author(s)
      Li Zizhen, Shan Lu, Hiroshi Kamabe
    • Organizer
      信学技報, vol. 121, no. 327, IT2021-35, pp. 40-44,
  • [Presentation] フェージングチャネル上のマルチユーザーシステムのための機械学習を用いた信号点配置の設計2021

    • Author(s)
      石橋弘也, 路 サン、 鎌部 浩
    • Organizer
      信学技報, vol. 121, no. 327, IT2021-36, pp. 45-50,
  • [Presentation] Signature Code Designed by Binarized Neural Networks2021

    • Author(s)
      Lantian Wei, Shan Lu, Hiroshi Kamabe
    • Organizer
      信学技報, vol. 121, no. 327, IT2021-34, pp. 34-39,
  • [Presentation] OMP Algorithm with Prior Information for Identification and Channel Estimation on Multiple Access Fading Channel2021

    • Author(s)
      Shan Lu, LianTian Wei, Hiroshi Kamabe,
    • Organizer
      信学技報, vol. 121, no. 28, IT2021-10, pp. 54-59,

URL: 

Published: 2022-12-28  

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