通信技术
通信技術
통신기술
COMMUNICATIONS TECHNOLOGY
2013年
6期
15-18
,共4页
直升机卫星通信%周期性删除信道%时间分集%重发%系统设计
直升機衛星通信%週期性刪除信道%時間分集%重髮%繫統設計
직승궤위성통신%주기성산제신도%시간분집%중발%계통설계
helicopter satellite communication%periodically-erased channel%time diversity%retransmission%system design
针对宽带直升机卫星通信信道的周期性衰落特性建立了周期性删除信道模型，基于此模型研究了重发分集的策略，推导了给定信道删除周期、窗口宽度、突发长度下重发次数、重发间隔的选择方法，讨论了重发模式与参数鲁棒性、系统设计需求的关系，并结合实例讨论了系统设计的设计步骤以及其他考虑因素。分析表明，采用两次重发可在大多数直升机信道条件下实现可靠传输，且具有较好的灵活性、较低的实现复杂度。
針對寬帶直升機衛星通信信道的週期性衰落特性建立瞭週期性刪除信道模型，基于此模型研究瞭重髮分集的策略，推導瞭給定信道刪除週期、窗口寬度、突髮長度下重髮次數、重髮間隔的選擇方法，討論瞭重髮模式與參數魯棒性、繫統設計需求的關繫，併結閤實例討論瞭繫統設計的設計步驟以及其他攷慮因素。分析錶明，採用兩次重髮可在大多數直升機信道條件下實現可靠傳輸，且具有較好的靈活性、較低的實現複雜度。
침대관대직승궤위성통신신도적주기성쇠락특성건립료주기성산제신도모형，기우차모형연구료중발분집적책략，추도료급정신도산제주기、창구관도、돌발장도하중발차수、중발간격적선택방법，토론료중발모식여삼수로봉성、계통설계수구적관계，병결합실례토론료계통설계적설계보취이급기타고필인소。분석표명，채용량차중발가재대다수직승궤신도조건하실현가고전수，차구유교호적령활성、교저적실현복잡도。
Aiming at the periodic fading of wideband helicopter satellite communication channel, the model of perrodically-erased channel is established. Based on this model the retransmission strategies are studied, and the selections of replica number, retransmission interval under given erasure period, windows size and burst length derived, and the relations between retransmission pattern and parameter robustness, system design requirements discussed. Finally wih example, the design procedures and other considerations are treated of. The analysis indicates that with two-time retransmission, the reliable transmission could be realized under the condition of most helicopter satellite communication channels, and it is of fairly good flexibility and relatively low implementation complexity.
