无线电通信技术2024，Vol.50Issue(6)：1101-1109,9.DOI:10.3969/j.issn.1003-3114.2024.06.006
高动态条件下的星地两步随机接入增强方法设计
Design of an Enhanced Two-step Satellite-Ground Random Access Method Under High Dynamic Conditions
摘要
Abstract
The low earth orbit satellite features strong space attenuation,rapid movement,and extensive coverage.To address the is-sues of low velocity and low capacity of satellite-ground random access,as well as the severe impacts from Doppler frequency shifts,this paper proposes an enhanced two-step satellite-ground random access method under high dynamic conditions.On the one hand,by re-peating the user's uplink MsgA data multiple times and incorporating successive interference cancellation at the receiver for demodula-tion,this method allows for the utilization of collided data and reduces the probability of user retransmissions,thus increasing the veloci-ty and capacity of the random access process.On the other hand,by introducing two-root preambles and performing joint detection at the receiver,this method tackles the problem of low preamble detection success rates under high dynamic conditions.Ultimately,compared to traditional random access schemes,the proposed method achieves faster access velocity and higher access capacity.关键词
低轨卫星通信/随机接入/不规则重复时隙ALOHA/双根前导码Key words
low earth orbit satellite communications/random access/irregular repetition slotted ALOHA/two-root preamble分类
信息技术与安全科学引用本文复制引用
赖禹新,李序,杨涛,刘荣科..高动态条件下的星地两步随机接入增强方法设计[J].无线电通信技术,2024,50(6):1101-1109,9.基金项目
国家重点研发计划(2022YFB2902604) （2022YFB2902604）
深圳市科技计划(KJZD20230928112759002) （KJZD20230928112759002）
国家自然科学基金(62371020) （62371020）
北京市自然科学基金(L232044)National Key R&D Program of China(2022YFB2902604) （L232044）
Shenzhen Science and Technology Plans(KJZD20230928112759002) （KJZD20230928112759002）
National Natural Science Foundation of China(62371020) （62371020）
Beijing Municipal Natural Science Foundation(L232044) （L232044）
