基于CDMA的Ad Hoc网络抗多址干扰分析  

Analysis of Anti-MAI for CDMA-Based Ad Hoc Networks

作　　者：陈西豪[1] 陈惠民[1] 郑林水[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《上海大学学报（自然科学版）》2006年第5期441-445,456,共6页Journal of Shanghai University:Natural Science Edition

基　　金：上海市科委基金资助项目(045115012);上海特种光纤重点实验室基金资助项目(SKLSF0200505)

摘　　要：分析了基于CDMA的Ad Hoc网络抗多址干扰及其对网络性能的影响,给出了泊松分布模型下的信干比与节点分布密度、码集互相关的数学表达式,从理论上指出了基于CDMA的Ad Hoc网络在物理层进行多址干扰检测,以及在MAC层完成冲突避免和在扩频选码时寻找异步互相关性良好的码集的必要性,提出了减小多址干扰的若干措施并分析了在完全异步的无线Ad Hoc网络中不能直接采用Walsh码的原因.Multiple access interference （MAI） analysis for CDMA-based Ad Hoc networks is presented. Relationship between SIR and density of distributed node and normalized code cross-correlation ratio is given under the Poisson distribution model. Theoretically, it is necessary for CDMA-based Ad Hoc networks to detect multiple access interference on the physical layer, to avoid collision on the MAC layer, and to select the code set with less normalized cross-correlation ratio. SINR is analyzed for an Ad Hoc network with a 64 bit Walsh set, and the result shows that the Walsh code cannot be directly used in an Ad Hoc network. Finally, several anti-MAI measures are presented for CDMA-based Ad Hoc networks.

关 键 词：无线自组网 多址干扰 扩频码 信干比 

分 类 号：TN911.6[电子电信—通信与信息系统]