基于认知的UWB系统软频谱自适应设计方法  

SSA Realization in Ultra Wideband Wireless Communication System Based on Cognitive Raeio Theory

作　　者：周刘蕾[1] 汪一鸣[1] 

机构地区：[1]苏州大学电子信息学院,江苏苏州215021

出　　处：《中国电子科学研究院学报》2008年第6期613-617,共5页Journal of China Academy of Electronics and Information Technology

基　　金：国家自然科学基金项目(60572075;60872003);国家"973"课题(2007CB310607)

摘　　要：认知无线电技术与UWB技术结合解决干扰问题已成为近几年研究的热点。基于认知的思想,在满足联邦通信委员会(FCC)频谱限制的基础上,设计出最佳脉冲波形,使其与周围电磁环境中的干扰设备的功率谱相互正交,从而有效地避开干扰。通过对电磁环境的周期性重复采样,UWB可以成为自适应抑制干扰的通信系统,实现了认知超宽带无线电的概念。此方法不需要在整个频段内降低UWB脉冲的功率谱密度,为提高UWB脉冲发射功率和增大UWB系统的通信距离,提供了一种灵活易行的解决方案。Cognitive Ultra Wideband Radio is proposed to exploit the advantages of combining Cognitive Radio with Ultra Wideband technologies, so as to solve the problems of coexistence and compatibility with other existing narrowband wireless systems in the environment. A novel low-complexity UWB pulse shaping algorithm is presented for producing the expected spectral notches right in the frequency band the neighboring radio devices located. The proposed pulse can be varied adaptively to suppress the varied narrowband interference existing in the surroundings by sampling the channel spectrum periodically. In particular, the power spectral density of UWB pulse does not need to be reduced over the whole frequency band. Therefore, it is possible to enlarge the communication range of UWB system by increasing the transmitted power of UWB pulses.

关 键 词：认知超宽带无线电 干扰抑制 频谱识别 软频谱自适应 

分 类 号：TN92[电子电信—通信与信息系统]