西安电子科技大学学报

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大规模MIMO系统下的导频随机接入方案

李晓洁;李颖;韩会梅   

  1. (西安电子科技大学 综合业务网理论及关键技术国家重点实验室,陕西 西安 710071)
  • 收稿日期:2017-01-11 出版日期:2018-02-20 发布日期:2018-03-23
  • 作者简介:李晓洁(1993-),女,西安电子科技大学硕士研究生,E-mail:rgyls_123@sina.com
  • 基金资助:

    国家自然科学基金资助项目(61671345)

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

摘要:

针对大规模多输入多输出系统下的导频污染问题,提出了一种联合最强用户冲突解决算法和定时提前信息的导频随机接入方案.考虑到传播时延的影响,基站端为每个导频选择合适的定时提前信息,从而减少使用最强用户冲突解决算法竞争导频的用户数,最终提高系统的冲突解决概率.仿真结果表明,与最强用户冲突解决算法相比,文中方案可显著提高系统中成功用户数.

关键词: 大规模多输入多输出系统, 导频污染, 最强用户冲突解决算法, 定时提前信息

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