Journal of Xidian University

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Pilot random access scheme in massive MIMO systems

LI Xiaojie;LI Ying;HAN Huimei   

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071, China)
  • Received:2017-01-11 Online:2018-02-20 Published:2018-03-23

Abstract:

To resolve the pilot contamination problem in massive multiple input multiple output(MIMO) systems, a pilot random access scheme called Strongest User Collision Resolution-Timing Advance(SUCR-TA), is proposed. This scheme takes the propagation delay into account, and selects an appropriate TA information for pilot to reduce the number of contenders who will perform the SUCR algorithm, and thus improves the probability of collision resolution. Simulation results demonstrate that, compared to the SUCR algorithm, the SUCR-TA scheme can significantly increase the number of the successful users of the system.

Key words: massive multiple input multiple output systems, pilot contamination, strongest-user collision resolution, timing advance