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An Approach to Preamble Collision Reduction in Grant-Free Random Access with Massive MIMO

journal contribution
posted on 2021-01-01, 00:00 authored by Jinho ChoiJinho Choi
In this paper, we study grant-free random access with massive multiple input multiple output (MIMO) systems. We first show that the performance of massive MIMO based grant-free random access is mainly decided by the probability of preamble collision. The implication of this is that although the number of antennas can be arbitrarily large, the (average) number of successful packet transmissions can be limited by the number of preambles. Then, we propose an approach to preamble collision reduction without increasing the number of preambles using the notion of superpositioned preambles (S-preambles). Since the channel estimation for conjugate beamforming can be carried out when unused S-preambles are known, a simple approach is derived to detect unused S-preambles and its performance is analyzed for a special case (superpositions with 2 preambles). Based on analysis and simulation results, it is confirmed that the proposed approach with S-preambles can increase the success probability with the same spectral efficiency as the conventional approach.

History

Journal

IEEE Transactions on Wireless Communications

Volume

20

Issue

3

Pagination

1557 - 1566

Publisher

IEEE

Location

Piscataway, N.J.

ISSN

1536-1276

eISSN

1558-2248

Language

eng

Publication classification

C1 Refereed article in a scholarly journal