Modified Chirp Waveforms in Cognitive UWB System
Modified Chirp Waveforms in Cognitive UWB System
复制标题
DOI：
10.1109/iccw.2008.101
复制
发表时间：
2008-05
期刊：
影响因子：
--
通讯作者：
Hanbing Shen;Weihua Zhang;K. Kwak
中科院分区：
文献类型：
--
作者：
Hanbing Shen;Weihua Zhang;K. Kwak
本文提出了一种在认知超宽带（UWB）系统中修改啁啾波形的方法。利用线性调频信号的时频关系，可以避免占用现有系统的频谱资源。在估计了电磁环境中的其他应用后，采用了自适应波形生成方法，该方法适应无线环境的变化，在时域上综合了线性调频信号的波形特征。因此，可以实现与其他应用的共存。此外，所提出的方案可以避免频率-时间变换，可能会增加系统的复杂度。计算机仿真与加性白色高斯噪声成功地证明了所提出的系统相比，传统的线性啁啾系统的认知UWB系统的性能的增加。
In this paper we propose a method to modify chirp waveforms in cognitive ultra wideband (UWB) system. By utilizing the time-frequency relationship of the chirp waveform, we can avoid the spectrum authorized to other existing systems. After estimating other applications in the electromagnetic environment, the adaptive waveform generation is adopted which adapts to the changing wireless environment and synthesizes chirp waveform features in the time domain. Therefore, coexistence with other applications can be accomplished. Furthermore, the proposed scheme can avoid the frequency-time transform that can increase the system complexity. Computer simulations with additive white Gaussian noise successfully demonstrate an increase in performance with the proposed system as compared to traditional linear chirp systems for cognitive UWB systems.