基于Chirp压缩脉冲的CUWB无线电波形设计

Design of CUWB Radio Waveforms Based on Chirp Compressed Pulses

为了提高认知超宽带(CUWB)无线电系统的频谱利用率,首先基于Chirp压缩脉冲波形和Hermite矩阵特征向量分解得到正交的基脉冲,然后在对基脉冲的带宽、中心频率等性能参数比较分析的基础上,运用迭代算法将若干个正交脉冲信号进行线性叠加,即可获得认知超宽带无线电的成形脉冲.仿真结果表明,由此产生的组合脉冲信号不仅满足FCC对UWB无线电脉冲信号的辐射功率要求,而且其频谱利用率也较高.同时,该脉冲信号波形具有较好的自适应性,能有效地抑制对其他窄带系统的干扰.

In order to enhance the spectrum utilization rate of cognitive ultra wideband radio（CUWB） system,the orthogonal base pulse waveforms were obtained,based on Chirp compressed pulses and decomposition of Hermite matrix eigenvector.And then a number of orthogonal pulse signals were superimposed linearly by using the iterative algorithm in terms of the comparative analysis of performance parameters including the bandwidth,central frequency and others of the base pulse waveforms,to acquire CUWB shaped pulse.By simulation it is shown that the resultant combinative pulses not only meet the requirements for the radiated power of UWB radio pulse signals set by FCC,but also has a higher spectrum utilization rate.Meanwhile the pulse waveforms are of better selfadaption,suppressing the interference to other narrowband systems effectively.