非时隙CDMA分组网络吞吐量性能分析:统一的方法  

Throughput analysis for unslotted CDMA packet networks:a unified approach

作　　者：廖小丁[1] 聂景楠[1,2] 张磊[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007 [2]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《电路与系统学报》2009年第2期37-43,共7页Journal of Circuits and Systems

基　　金：国家自然科学基金资助项目(60503049);东南大学移动通信国家重点实验室开放课题基金资助项目(N200602)

摘　　要：CDMA分组网络性能主要受限于信道中同时传输的其它分组的干扰。与时隙CDMA分组网络相比,非时隙CDMA分组网络所受到的干扰情况更加复杂。本文提出了一种非时隙CDMA分组网络的干扰分析模型,并采用递归方式建立了网络吞吐量性能分析的统一方法。在此基础上,分析了网络节点突发固定长度分组和突发可变长度分组两种情况下的网络吞吐量性能,并讨论了扩频增益和分组传输方式对网络性能的影响,给出了相应的数值结果。文章最后进一步讨论了吞吐量的上下界问题。与前人提出的马尔可夫模型相比,采用本文提出的方法可以得到更为准确的吞吐量性能。The throughput performance of CDMA packet networks is limited by multiple access interference. In comparison with slotted CDMA packet networks, unslotted CDMA packet networks are more difficult for performance analysis. In this paper, a theoretical model for multiple access interference in unslotted CDMA packet networks is presented, and a unified approach for throughput analysis is proposed by using recursive method. And throughput performance of unslotted CDMA packet networks with fixed packet length and variable packet length are investigated, respectively. Moreover, the impacts of spreading gain and the way of packet transmission on throughput performance are discussed. Further, the upper and lower bounds of throughput are given. The proposed approach is more accurate than the approach based on Markov chain when evaluating the throughput performance of unslotted CDMA packet networks.

关 键 词：非时隙:码分多址 吞吐量 分组网络 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]