准时隙ALOHA-CDMA信道的性能及稳定性  

The Stability and Performance of the Acknowledgment-type-ALOHA-CDMA Channels

作　　者：邵建华[1] 殷奎喜[1] 王兴和[1] 

机构地区：[1]南京师范大学江苏省光电技术重点实验室,南京210097

出　　处：《河南师范大学学报（自然科学版）》2009年第1期62-65,共4页Journal of Henan Normal University(Natural Science Edition)

基　　金：教育部重点实验室基金资助(NS206005);江苏省重点实验室开放基金资助(JK20050304)

摘　　要：针对时隙ALOHA-CDMA需要全网同步的特点,提出一种准时隙ALOHA-CDMA信道,给出这种信道的模型.首先,计算了并仿真了这种信道的吞吐性能.然后,利用扩散过程理论推导了这种信道的扩散系数和漂移系数,通过对信道稳定性分析表明,对一个随机接入信道来说,吞吐量和延迟始终是一对矛盾,应视系统要求进行权衡.本文提出的准时隙ALOHA-CDMA信道,对于简化组网成本具有现实的意义.A new kind of multiple access channel which is called acknowledgment-type random access and code division multiple access channel （ACK-ALOHA-CDMA） is proposed in this paper. The channel model is given. First the throughput performance of the channel is studied. Then, the stability of ACK-ALOHA-CDMA channel is investigated based on diffusion process. Simulation results show that a significant performance improvement and a high-bandwidth efficiency can be gained by using this channel. Consequently, ACK-ALOHA-CDMA channel is very suitable for application in satellite VSAT systems and distributed packet radio networks.

关 键 词：准时隙ALOHA—CDMA 吞吐量 信道稳定性 

分 类 号：TN914.5[电子电信—通信与信息系统]