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为了简化时隙ALOHA-CDMA系统的时间同步设备,提出了一种可用于卫星VSAT网络内向信道的应答式时隙ALOHA-CDMA信道模型.将端站分为M个子系统,利用主站发出周期性询问信号,建立了信道模型;通过扩频多址干扰(MAI)和分组检测概率的推导,计算出该信道的稳态吞吐量;并将扩散过程理论用于该信道的稳定性分析,得到扩散系数a(r)、漂移系数b(r)和信道平稳分布p(r).仿真结果表明,该系统可以显著提高信道吞吐性能和信道利用率,且存在1～2个稳定平衡点.应答式时隙ALOHA-CDMA信道可以降低卫星VSAT系统及分组无线网络系统的组网成本.
In order to simplify the time synchronization equipment of slot ALOHA-CDMA system, an answer-type slot ALOHA-CDMA channel model which can be used for the satellite VSAT network internal channel is proposed.The terminal is divided into M subsystems, Inquire the signal and set up the channel model. Through the derivation of spread spectrum multiple access interference (MAI) and packet detection probability, the steady-state throughput of the channel is calculated. The diffusion process theory is applied to the stability analysis of the channel to obtain the diffusion The coefficients a (r), the drift coefficient b (r) and the channel stationary distribution p (r) .The simulation results show that the system can significantly improve the channel throughput and channel utilization, and there are 1 ~ 2 stable equilibrium points. The slot ALOHA-CDMA channel can reduce the networking cost of the satellite VSAT system and the packet wireless network system.