衰落信道下MFSK信号符号速率估计快速算法

Rapid Symbol Rate Estimation Algorithm for MFSK Signal in Fading Channel

匹配识别在信号处理中发挥着重要作用,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,本文将MFSK信号调制频率集作为先验信息,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MFSK信号过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。

Matching recognition plays an important role in signal processing, 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. In the case of known MFSK signal modulation frequency set, a rapid algorithm is proposed in this paper. By means of detecting the MFSK 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.