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文中提出一种基于正交载波和伪随机序列的新型频谱编码正交UWB脉冲设计方法,该方法是在频域中利用PN序列对经过频移的子脉冲进行编码来产生正交脉冲。在IR-UWB(脉冲无线电超宽带)中引入了正交载波和PN序列,使其不仅具有传统IR-UWB和多频带CB-UWB(基于载波的超宽带)优点,而且提高了UWB信号发射的瞬时频谱和瞬时能量的效率。脉冲的自相关和互相关特性皆优于传统的脉冲。另外,借助于认知无线电技术,可保证发送信号满足FCC的UWB频谱规划,避免与其他传统窄带系统干扰。仿真结果表明该脉冲设计方法能够有效的抑制窄带干扰,并降低复杂度。
In this paper, a novel quadrature UWB pulse design method based on orthogonal carrier and pseudo-random sequence is proposed. The method uses the PN sequence to encode the frequency-shifted sub-pulses in the frequency domain to generate orthogonal pulses. The introduction of orthogonal carrier and PN sequences into IR-UWB (Pulse Radio Ultra Wide Band) introduces not only the advantages of traditional IR-UWB and multi-band CB-UWB (carrier-based ultra-wideband) but also improved UWB signal transmission Instantaneous spectrum and instantaneous energy efficiency. Pulse autocorrelation and cross-correlation are better than the traditional pulse characteristics. In addition, by means of cognitive radio technology, it is guaranteed that the transmitted signal meets the FCC’s UWB spectrum plan and avoids interference with other conventional narrowband systems. The simulation results show that the pulse design method can effectively suppress the narrowband interference and reduce the complexity.