Telecommunication Systems

, Volume 70, Issue 2, pp 185–191 | Cite as

MIMO receivers considering preamble collisions for grant-free random access in machine type communication systems

  • Minjoong RimEmail author
  • Seungyeob Chae
  • Chung G. Kang


One of the main requirements for next generation mobile or wireless communication systems is to effectively support a large number of machine type communication (MTC) devices for internet of things applications. In this paper, we consider grant-free random accesses from MTC devices, where a small-sized data can be transmitted concurrently with a preamble randomly selected from a pool of preambles. In order to support a huge number of MTC devices, large-scale multiple-input multiple-output (MIMO) techniques can be used. Concurrent transmissions from multiple devices to a single time–frequency resource can be handled by a large number of antennas at a base station if the number of preambles is considerably large compared to the number of the concurrent accesses. However, in practice, the number of preambles is limited and preamble collisions can deteriorate the reception performance. In this paper, we propose a MIMO receiver scheme for grant-free random access with taking care of preamble collisions. The proposed scheme attempts to decode all received packets even with preamble collisions, by exploiting the capture effect and interference cancellation techniques.


Multi-input multi-output (MIMO) receiver Machine type communications Large-scale MIMO Random access 



This work was supported by Institute for Information and communications Technology Promotion (IITP) Grant funded by the Korea government (MSIT) (No. 2017-0-00724). This work was also supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIT) (No. 2016R1A2B1008953).


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Information and Communication EngineeringDongguk UniversitySeoulRepublic of Korea
  2. 2.School of Electrical EngineeringKorea UniversitySeoulRepublic of Korea

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