工程科学与技术2018，Vol.50Issue(2)：105-111,7.DOI:10.15961/j.jsuese.201601079
大规模MIMO多小区多用户TDD系统导频污染抑制方法
Pilot Contamination Suppression in Massive MIMO Multi-cell Multi-user TDD Systems
摘要
Abstract
In order to suppress the pilot contamination in Massive MIMO system,a pilot scheduling scheme based on path loss to perform user grouping (PLUG) was proposed.The proposed PLUG scheme divided the users into the center user group and the edge user group according to different levels of pilot contamination.The proposed PLUG scheme assigned the same pilot sequences to the center users who suffering from slight pilot contamination and assigns orthogonal pilot sequences to the edge users who suffering from severe pilot contamination,thus inhibiting the impact of pilot contamination.The PLUG scheme assumed that the number of edge users in each cell is the same.To improve flexibility of PLUG,an improved pilot scheduling scheme based on path loss to perform user grouping (IPLUG) was proposed.By introducing the decision parameters,the strategy dynamically grouped and selected the number of edge users per cell.It avoided users in good channel conditions being wrongly divided into edge user group which would increase the pilot overhead,or users in bad channel conditions being wrongly divided into cen-ter user group whichwould decrease the quality of communication.In this way,the accuracy and rationality of user grouping were improved. The-ory analysis and simulation results showed that the proposed scheduling can improve the channel estimation normalized MSE,uplink SINR and achievable rate of edge users with little performance loss of center users.In conclusion,the proposed schemes can effectively suppress the pilot pollution of Massive MIMO system and reduce the probability of communication interruption.关键词
大规模MIMO/导频污染/导频调度/用户分组Key words
Massive MIMO/pilot contamination/pilot scheduling/user grouping分类
信息技术与安全科学引用本文复制引用
吴玉成,刘统,曹猛,杨婷婷..大规模MIMO多小区多用户TDD系统导频污染抑制方法[J].工程科学与技术,2018,50(2):105-111,7.基金项目
国家自然科学基金资助项目(91438104) （91438104）
重庆市自然科学基金重点项目资助(CSTC2013jjB40004) （CSTC2013jjB40004）
