无线网络中的高效空间-频率编码技术(英文)  

Efficient Coding Scheme over Space and Frequency for Wireless Networks

作　　者：Bulega Tonny Eddie 倪豆[1] 韦岗[1] 陈芳炯[1] 

机构地区：[1]华南理工大学电子与信息学院,广州510641

出　　处：《科学技术与工程》2008年第7期1694-1699,共6页Science Technology and Engineering

基　　金：国家自然科学基金(60402014)资助

摘　　要：循环延迟冗余技术(CDD)是OFDM系统中对抗码间串扰的一项重要技术。CDD在发送端采用多天线,不同天线采用不同的相位延迟,从而增加发送端等价的信道频率选择性。首先对CDD技术进行综合评述,然后分析了CDD中的最佳延迟选择,并和CDD技术和经典的Alamouti空时码进行性能比较。仿真结果显示最优延迟下CDD技术能达到更好的性能,并且对天线阵列的数目没有约束。Cyclic delay diversity （CDD） is a suggested spatial diversity transmission scheme applied in OFDM systems to mitigate inter-symbol interference, by increasing the frequency selectivity of the channel seen at a single antenna receiver. An overview of space frequency-CDD coding （SFC-CDD） is provided and the optimal selection of the time domain cyclic delays is analyzed. Comparison with the well-known Alamouti scheme is presented and the analysis is then extended to multiple transmit and receive antennas. It is shown that for an SFC-CDD scheme benefits from spreading and channel coding that makes it very competitive since it is applicable to any number of transmit antennas with no loss in rate. It is shown that full diversity is achieved even without additional coding

关 键 词：循环延迟冗余 正交频分复用 空频编码 

分 类 号：TN929.531[电子电信—通信与信息系统]