CAJ | 학술논문

文章在研究卫星系统中实现分组通信的短数据包纯 ALOHA、扩频 ALOHA方式和时隙 ALOHA ( S-ALOHA)多址接入方式，以及适合长数据包的预约ALOHA多址接入方式的基础上，介绍了防止S-ALOHA系统饱和与振荡的输入控制(ICP)、重发控制(RCP)和输入重发控制(IRCP)3种动态稳定控制策略。首先，针对3种策略都涉及到的积压终端数估计，文章提出了一种修正算法，并进行了仿真验证。在分组高到达率的情况下，该算法较于传统算法仍然能保证系统的小时延和吞吐率相应增加。其二，就无线信号分组被遮蔽但仍存在捕获效应的移动卫星通信场景，介绍了一种基于S-ALOHA的终端分组发送概率的动态稳定的计算算法，该算法利用捕获效应可以进一步改善陆地移动卫星通信系统性能。
문장재연구위성계통중실현분조통신적단수거포순 ALOHA、확빈 ALOHA방식화시극 ALOHA ( S-ALOHA)다지접입방식，이급괄합장수거포적예약ALOHA다지접입방식적기출상，개소료방지S-ALOHA계통포화여진탕적수입공제(ICP)、중발공제(RCP)화수입중발공제(IRCP)3충동태은정공제책략。수선，침대3충책략도섭급도적적압종단수고계，문장제출료일충수정산법，병진행료방진험증。재분조고도체솔적정황하，해산법교우전통산법잉연능보증계통적소시연화탄토솔상응증가。기이，취무선신호분조피차폐단잉존재포획효응적이동위성통신장경，개소료일충기우S-ALOHA적종단분조발송개솔적동태은정적계산산법，해산법이용포획효응가이진일보개선륙지이동위성통신계통성능。
This paper discusses the ALOHA multiple access technique of packet communication in satellite systems. General ALOHA methods are firstly introduced including the pure ALOHA,spread ALOHA and slotted ALOHA ( S-ALO-HA) suitable for short packets, and the reservation ALOHA for long packets. Then three dynamic stability control strate-gies,Input Control Procedure ( ICP) , Retransmission Control Procedure( RCP) and Input Retransmission Control Procedure ( IRCP) , are given to prevent the saturation and oscillation of S-ALOHA systems. In order to implement the above control strategies,the receiving satellite needs to estimate the number of backlogged terminals in the system. A modified estimation algorithm for the number of backlogged terminals is presented and is validated by simulations. In addition,a Terminal-Pack-ets-Transmission-Probability computation algorithm, which is suitable to satellite communication scenarios with dodging effect, is introduced. This channel-sensitive, dynamically stabilized S-ALOHA algorithm can improve the performance of land-mobile satellite communication systems by applying captive effect.