摘要
在现有器件工作速度受限条件下,提出了一种超宽带扩频系统实现方案。通过对扩频后的信号频域进行多载波二次扩展,提高了扩频系统的可实现带宽,从而在保持高扩频增益的前提下获得了高传输速率,降低了有效信号的功率谱密度要求,达到了隐藏有效信号频谱、降低截获率的目的。最终系统实现结构统一,扩展形式灵活,解决了现有条件下宽带高速率扩频系统的实现困难。
A novel implementation of uhra-wideband（UWB） spread spectnan system is presented under the condi- tion of device operating frequency limitation. This architecture, which utilizes the characteristics of direct spec- trum spreading and multicarrier modulation for signal spectrunl two-dimensional spreading, has increased the real- izable spectrum bandwidth. Therefore it obtains faster bit-rate in the condition of higher spread spectrum gain and lower requirement of power spectral density, and leads to the results of signal concealment and low probability in- terception. The practical design achieves the purpose of uniform structure and flexible extension ability, and solves the problem of ultra- wideband high bit- rate spread spectrum system implementation hardness.
出处
《电讯技术》
北大核心
2012年第8期1251-1254,共4页
Telecommunication Engineering
关键词
超宽带
扩频通信
直接系列扩频
多载波调制
低截获率
uhra-wideband
spectrum spreading communication
direct spectrum spreading
muhicarrier modu- lation
low interception probability
