一种基于延时相乘的高精度码元速率估计算法

High precision symbol rate estimation algorithm based on delay-mutiply circuit

为了实现相移键控信号码元速率的快速高精度估计,在分析延时相乘原理的基础上,提出了一种二级码元速率估计算法。算法先估计信号带宽得到码元速率的粗估计,利用码元速率的粗估计值确定延时时间,再用延时相乘法得出码元速率的高精度估计。计算机仿真验证了算法的有效性。该方法不仅适用于基带信号码元速率估计,也适用于已调信号的码元速率估计。在采样速率不变的情况下,算法的估计精度随着采样点数的提高而提高。

To estimate symbol rate of phase‐shift keying （PSK ）signals in high precision rapidly ,a new algorithm is proposed after an analysis of the delay‐multiply circuit .The new algorithm estimates symbol rate roughly by estimating the bandwidth of signal .Using with the rough estimation ,the algorithm can estimate the symbol rate in high precision by the delay‐multiply circuit .The validity is verified by computer simulations .This method is not only applicable to the symbol rate estimation of baseband signals ,but also to the symbol rate estimation of modulated signals .The estimation accuracy of the proposed algorithm can be improved by increasing the number of sampling data when the sampling rate is fixed .