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机构地区:[1]苏州大学电子信息学院,江苏苏州215021 [2]哈尔滨工业大学电子与信息技术研究院,黑龙江哈尔滨150001
出 处:《电波科学学报》2008年第6期1154-1158,共5页Chinese Journal of Radio Science
基 金:国家自然科学基金项目(No.60572075);国家自然科学基金项目(No.60872003);国家“973”课题(No.2007CB310607)
摘 要:结合UWB系统的工作特点,对信道中信号的频谱特性进行分析,在变换域(频域,或时间-尺度域)中设计出最佳脉冲波形,使其与周围电磁环境中含有干扰的变换域相互正交,从而有效地避开干扰。通过对环境的周期性重复采样,可使得UWB成为一个自适应抑制干扰的通信系统。仿真结果表明,设计的自适应抑制干扰脉冲比通常使用的Scholtz脉冲的性能更优,抗干扰能力更强。且此方法不需要在整个频段内降低UWB脉冲的功率谱密度,为提高UWB脉冲发射功率,增大UWB系统的通信距离,提供了一种灵活易行的参考型方案。It is a technical innovation to exploit the advantages of combining transform domain communication (TDC) technology with Ultra wideband (UWB) system, so as to solve the problems of coexistence and compatibility between UWB and other existing narrowband wireless systems. By analyzing the input signal spectrum characteristics of the receiver using autoregressive (AR) method, a novel optimal transform domain UWB pulse based on the estimated spectrum is designed to suppress the narrowband interferences. By sampling the channel spectrum characteristics periodically, the pulse can be varied adaptively to avoid the varied narrowband interference existing in the surroundings. Simulation results show that the proposed UWB waveform has a better single-link BER performance and stronger antijamming abilities in additive white Gaussian noise (AWGN) channel than other conventional waveforms such as Scholtz' s monocycle, etc.. Furthermore, the power spectral density of UWB pulse does not need to be reduced over the whole frequency band. Therefore, it is possible to expand the communication range of UWB systems by increasing the transmitted power of UWB pulse.
关 键 词:超宽带 变换域通信 自适应脉冲波形设计 干扰抑制
分 类 号:TN929.5[电子电信—通信与信息系统]
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