| 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。 |
| 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 |
| DOI： |
|
| 基金项目: |
|
| Implementation of ultra-wideband low interception probability spread spectrum system |
| SHEN Zhi,ZHOU Shi-ping,HU Zhe,HAN Jian-li |
| (Hubei Institute of Spaceflight, Wuhan 430040, China) |
| Abstract: |
| A novel implementation of ultrawideband(UWB) spread spectrum system is present
ed under t
he condition of device operating frequency limitation. This archite
cture, which utilizes the characteristics of direct spectrum spreading and multi
carrier modulation for signal spectrum twodimensional spreading, has increased
the realizable spectrum bandwidth. Therefore it obtains faster bitrate in the
c
ondition of higher spread spectrum gain and lower requirement of power spectral
density, and leads to the results of signal concealment and low probability inte
rception. The practical design achieves the purpose of uniform structure and fle
xible extension ability, and solves the problem of ultra-wideband high bit-rat
e spread spectrum system implementation hardness. |
| Key words: ultra-wideband spectrum spreading communication direct spectrum spreading mul
ticarrier modulation low interception probability |
《电讯技术》编辑部 