A Novel Doppler Shift Estimation via Optimum Bandwidth Filtering in HF/VHF Communications

摘要：

In HF/VHF communications, the received signal is easily overwhelmed by various noise and interference signals, which has seriously affected the estimated accuracy of Doppler frequency shift, the band-pass filter (BPF) is used to suppress noise and interference effectively. Nearly everyone agrees that the more noise suppression and the more accurate the estimated results. Nevertheless, in this paper, through theoretical analysis and simulation results for the classical methods such as level crossing rate (LCR), we educe a conclusion that there exists an optimum bandwidth ratio to minimize the estimated error of Ooppler frequency shift, and appropriate bandwidth noise is helpful to improve estimation performance. Therefore, in order to ensure the accuracy estimation of Doppler frequency shift under low signal-noise-ratio (SNR) conditions (y<0dB), the optimum bandwidth ratio of BPF is deduced and determined, with which the estimation performance of proposed method is always superior than 2~5dB, comparing with current methods.

关键词： doppler shift estimation bandwidth filtering HF/VHF Communications low signal-noise-ratio

作者: Liping Wu Zan Li Jiandong Li

作者单位: State Key Laboratory of ISN XiDian Univercity Xian, China 710071

会议类型: 国际会议

会议名称: 2011 International Conference on Information and Computer Networks(ICICN 2011)(2011年信息与计算机网络国际会议)

会议地点: 贵阳

会议语种:英文

页码: 410-413

在线出版日期: 2011-01-26（万方平台首次上网日期，不代表论文的发表时间）