一种实现PSK信号快速码速率估计的新方法

A new method for realization of fast bit rate estimation of PSK signal

为了解决如何快速、准确地估计相位编码信号码元速率问题,提出了一种基于信号离散域累加平均的码速率估计方法.通过对载频估计值和采样频率进行累加长度和步进的设置,累加平均值会在信号相位跳变点处出现峰值,设置一定的门限后,利用搜索峰值点即可迅速计算码速率.该方法只进行加法和少量的乘法运算,避免了传统瞬时自相关算法中的大量乘法运算,具有快速和易于工程实现的特点.仿真实验表明,该算法具有一定的有效性和准确性,与瞬时自相关方法相比具有更强的抗噪性.

To solve the problem concerning the quick and accurate bit rate estimation of phase-shift keying（PSK） signals,a bit rate estimation method based on the discrete accumulation average of signals was proposed.Through setting the accumulation length and step for both carrier frequency estimation value and sampling rate,the peak values of accumulation average would appear at the phase mutation-points of the signals.After setting a certain threshold,the bit rate could be calculated quickly by searching the peak value points.Because only the addition and less multiplication operations are carried out in the proposed algorithm,a large number of multiplication operations in the traditional instantaneous auto-correlation algorithm can be avoided.In addition,the proposed algorithm exhibits the characteristics of high speed and easy engineering realization.The results of simulation tests show that the proposed algorithm has certain effectiveness and accuracy,and exhibits the stronger anti-noise property compared with the instantaneous auto-correlation algorithm.