摘要
在慢衰落信道中,协同分集是一种新的空间分集方式,其本质是利用分布用户的单天线形成一个虚拟的多天线系统,即形成虚拟MIMO。在其协同方式中,有AF模式和DF模式(编码协同是DF模式的一种特殊情况)。该文针对AF与DF两种基本协同方式进行了详细的比较,并在对称信道和非对称信道下进行了系统的仿真。理论分析和仿真结果表明:在相同的条件下,AF模式相对于DF模式有较大的优势是因为AF模式较DF模式有较大的阵列增益,虽然两者有相同的分集增益,但DF有更大的灵活性。
Cooperative diversity is a new space diversity technology under the slow fading channel. There are two cooperative models, Amplify and Forward (AF) model and Decode and Forward (DF) model (Coded Cooperation (CC) is a special case of DF). A detailed comparison of AF and DF models are given in this paper. The simulations under symmetrical channel and dissymmetrical channel are also given. The results given in this paper show that the AF model has more advantage than the DF model at the same condition from the theory analyses and the simulations. Although they have the same diversity gains, the AF model has bigger array gain than the DF model, Whereas the DF model has more agilities than the AF model.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2007年第5期911-914,共4页
Journal of University of Electronic Science and Technology of China
基金
中国自然基金(60572090
60472045
60496313)
国家863计划863-317-03-01-05/MII-C3G-05-00支助项目
关键词
放大前传
协同分集
解码前传
多用户信息论
传感器网络
amplify and forward
cooperative diversity
decode and forward
multi-user information theory
sensor network