| 衰落信道下MFSK信号符号速率估计快速算法 |
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| 引用本文： | 张红超,欧阳喜.衰落信道下MFSK信号符号速率估计快速算法[J].信号处理,2014,30(10):1157-1164. |
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| 作者姓名： | 张红超 欧阳喜 |
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| 作者单位： | 解放军信息工程大学 |
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| 基金项目： | 国防科技基金（9140C860103120C8601）资助课题 |
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| 摘 要： | 匹配识别在技侦一线业务单位中发挥着重要作用，其对算法的实时性要求较高。多进制频移键控(M-ary frequency-shift keying, MFSK)信号的符号速率为匹配识别中重要的特征参数之一，本文通过分析多径及频偏等衰落信道条件对符号速率估计产生的影响，将调制频率集作为先验信息的情况下，给出了一种衰落信道下MFSK信号符号速率估计的快速算法，该算法通过检测过Goertzel滤波器后输出的最大幅度值，经去毛刺、过零点间隔聚类等处理后完成符号速率的准确估计。仿真结果表明:文中算法具有较强抗噪性能，加入多普勒频移及多径等衰落信道条件仍具有较高的估计精度，且运算量大大减小，非常适合应用于匹配识别中。实际信号处理也表明了该算法的有效性及可行性。
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| 关 键 词： | 匹配识别 FSK调制信号 符号速率 衰落信道 戈泽尔 |
| 收稿时间： | 2014-04-10 |
Rapid Symbol Rate Estimation Algorithm for MFSK Signal In Fading Channel |
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| Affiliation: | Information Engineering University of PLA |
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| Abstract: | Matching recognition plays an important role in the technical investigation line business unit，having a high real-time requirements of the algorithm. The symbol rate of M-ary frequency-shift keying (MFSK) signal is one of the important feature parameters for matching identification. According to analyze the effect of the channel disturbance on the signal, in the case of known modulation frequency set, a rapid algorithm is proposed in this paper. By means of detecting the signal’s peak value, smoothness, stating the distance of zero-crossing and clustering, this algorithm completes the estimation of the symbol rate. The experimental results prove that this algorithm get a better anti-noise property, joined the Doppler frequency shift and multi-path fading channel conditions still has high accuracy，and the computation is greatly reduced，especially suitable for matching recognition. The treatment of actual signal also shows the effectiveness and feasibility of this algorithm. |
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