Spectrum Shaping and NBI Suppression in UWB Communications
Spectrum Shaping and NBI Suppression in UWB Communications
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DOI：
10.1109/twc.2007.360395
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发表时间：
2007-05
影响因子：
10.4
通讯作者：
Yue Wang;Xiaodai Dong;I. Fair
中科院分区：
文献类型：
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作者：
Yue Wang;Xiaodai Dong;I. Fair
本文研究了超宽带（UWB）通信中的频谱整形，以引入频谱零点来限制窄带信号的干扰。每个传输的符号用一个“编码高斯单环脉冲”表示，其中高斯单环根据设计的码字进行加权、延迟和求和。高斯单环的使用确保了满足联邦通信委员会（FCC）建立的UWB频谱掩模，并且码字被设计为在现有窄带设备使用的频率上产生频谱零。讨论了不同频谱形状（如巴特沃斯、切比雪夫、椭圆）和在多个干扰频带引入零点所获得的信号。这种方法可用于各种系统；作为一个应用，我们使用带频域均衡的单载波块传输（SC-FDE）模拟了窄带干扰（NBI）下频谱为零的编码单环UWB系统的性能，并将其与使用单个高斯单环的未编码SC-FDE UWB系统的性能进行了比较。研究结果表明，通过在干扰频率处发射和匹配滤波具有谱零的脉冲，可以有效地抑制NBI，从而提高了UWB系统对NBI的鲁棒性
This paper investigates spectrum shaping in ultra-wideband (UWB) communications in order to introduce spectral nulls to limit interference with narrowband signals. Each transmitted symbol is represented by a "coded Gaussian monocycle pulse" in which Gaussian monocycles are weighted, delayed and summed in accordance with a designed codeword. The use of the Gaussian monocycle ensures that the UWB spectrum mask established by the Federal Communications Commission (FCC) is met, and the codeword is designed to generate a spectral null at the frequency or frequencies being used by existing narrowband devices. Signals obtained with different spectrum shapings (e.g., Butterworth, Chebyshev, elliptical) and by introducing nulls at multiple interference frequency bands are discussed. This approach can be used in various systems; as one application, we simulate the performance of a coded monocycle UWB system with a spectral null in the presence of narrowband interference (NBI) using single carrier block transmission with frequency domain equalization (SC-FDE), and compare its performance with that of an uncoded SC-FDE UWB system using a single Gaussian monocycle. Our results show that NBI can be effectively suppressed by transmitting and matched filtering the pulse with a spectral null at the interference frequency, therefore improving the robustness of UWB systems to NBI