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浏览/检索结果: 共2条，第1-2条 帮助 限定条件 内容类型：会议论文     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Correction method for detection of the frequencies of railway fsk signals (EI CONFERENCE) 会议论文 2008 9th International Conference on Signal Processing, ICSP 2008, October 26, 2008 - October 29, 2008, Beijing, China Xuguang Y.; Yu J.; Xifeng Z.; Tiefu D. 收藏  |  浏览/下载：56/0  |  提交时间：2013/03/25 In order to acquire the information of railway binary frequency-shift keying signals  which include upper/down side frequencies and base low-frequency with high-accuracy  a novel frequency detection algorithm for France UM-71 system is proposed. Combining fast Fourier transform with the ratio correction method  the carrier frequency and the base frequency are obtained. Furthermore  the hardware consumption has been decreased. And it possesses the advantage of simple algorithm and fast operation speed. Comparing with the detection of the base frequency  the upper/down side frequency of railway signal is more difficult. Based on spectrum analysis and the spectrum correction  a new method  which adopts the sliding window  is put forward in this paper. The absolute differences between the upper side frequencies and the down side frequencies obtained are regarded as the criterion for judgment. Then the set of data  in which the maximum absolute value is  is to be the result of the upper/down side frequency. Because the sliding window will go through every stage when the upper/down side frequency changes  therefore  it is not sensitive enough to the position of data which need to be transformed. Using the method mentioned above  the experiment results show that the accuracy requirement of the side frequency is satisfied well. 2008 IEEE.   A new frequency offset estimation algorithm for OFDM system based on BPSK (EI收录) 会议论文 IET Conference Publications, Guangzhou, China, November 15, 2005 - November 17, 2005 作者:  Yi, Q.M.[1,2];  Xie, S.L.[1];  Zhou, W.X.[2] 收藏  |  浏览/下载：2/0  |  提交时间：2019/04/18 Binary phase shift keying  Carrier communication  Cost functions  Frequency modulation