摘要
超宽带系统由于和其他系统共存,其信号的频谱特性分析是系统设计时要考虑的重要问题。本文分析了跳时超宽带(TH-UWB)信号的功率谱,对影响谱线平滑效果的因素进行了讨论,发现在功率谱离散谱线中存留有间隔为脉冲重复频率的离散谱线,而且该谱线不会由于TH码的周期的增大而获得平滑,只会由于时移范围以及频率的增加而得到衰减。由于随机时移操作不能够完全消除频谱中的离散谱线,在TH-UWB通信系统设计中应该考虑这部分谱线可能造成的影响,必要时应采取其他方式消除,以获得使用频段内类噪声的功率谱。仿真实验验证了本文分析的正确性。
For the co-existence capability requirement of the UWB signals,its spectral properties are important considerations in the design of the UWB communication systems. The analysis of the power spectral density of Time-Hopping Uhra-wide Bandwidth （TH- UWB） signals is presented and the factors affecting the attenuation of discrete spectral lines are discussed. The result shows that that there are discrete spectral lines at the multiples of pulse reception frequency among the discrete spectral lines. These discrete spectral lines cannot be smoothed by increasing the period of TH codes, but can be attenuated as the frequency or the range of random time hopping increases. It is impossible to eliminate the discrete PSD components by random timing shift, its effect should be considered in the design of TH-UWB communication systems. Other measures may be taken to get＂ noise like＂ PSD. Simulation results verify the conclusions of the analysis.
出处
《信号处理》
CSCD
北大核心
2007年第3期352-355,共4页
Journal of Signal Processing
基金
国家自然科学基金(60572148)。
