超宽带低截获率扩频系统实现

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。

Implementation of ultra-wideband low interception probability spread spectrum system

A novel implementation of ultra wideband(UWB) spread spectrum system is presented under the condition of device operating frequency limitation. This architecture, which utilizes the characteristics of direct spectrum spreading and multicarrier modulation for signal spectrum two dimensional spreading, has increased the realizable 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 interception. 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.