| 摘要: |
| 基于5G系统的控制信道结构和传输机制，通过多种场景下的性能仿真从而得到导频图案和聚合等级的优化准则。首先，用于解调控制信道的导频与控制信道采用相同的预编码以实现控制信道波束的透明传输；其次，控制信道在频域资源上打散，当信道状态未知则采用分集的传输机制；再次，导频分布随聚合等级的变化而调整，低聚合等级导频密度大，高聚合等级导频密度小。该方法可以根据信道状况是否可知采用波束赋形或分集的传输，实现控制信息的可靠、有效传输。 |
| 关键词: 5G新无线接入技术 控制信道 导频密度 聚合等级 传输方式 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(61871471);陕西省重点研发计划项目(2019GY-055)；西安市高校人才服务企业项目计划（GXYD20.4）；西京学院高层次人才专项基金（XJ18B01） |
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| Downlink Control Channel Transmission of 5G Mobile Communication System |
| LIU Wenhao,WANG Yanwen,LIU Renjing,HAO Donglai,LIU Xiangyang |
| (1.Institute for Science,Technology and Education Development,Xi′an Jiaotong University,Xi′an 710049,China;2.School of Information Engineering,Xijing University,Xi′an 710123,China;3.College of Information and Communication,National University of Defense Technology,Xi′an 710106,China) |
| Abstract: |
| According to the control channel structure and transmission mechanism of 5G new radio (NR),the preliminary conclusions of optimization rule for pilot density and aggregation level are given through performance simulation under various scenarios.Firstly,the pilot used to demodulate the control channel adopts the same precoding as control channel to achieve transparent beam transmission.Secondly,the control channel disperses on the frequency domain resources,when the channel state information is unknown the control channel is distributed in the frequency to obtain diversity gain.Thirdly,the pilot distribution is adjusted with the change of aggregation level.The pilot density of aggregation grade is dense for smaller aggregation level,and sparse for larger aggregation level.This method can adopt transmit diversity or beamforming to ensure reliable transmission，the choice depends on the availability of channel status information，also the pilot density can be adjusted based on aggregation to achieve effective transmission. |
| Key words: 5G new radio control channel pilot density aggregation leve transmission mode |
