摘要
数字通信中码元速率的估计对调制信号的识别、非合作通信的盲解调和无线电频谱监测等有着重要意义。为此,本文提出了一种基于瞬时频率谱的码元速率估计方法。该方法首先利用Hilbert变换将实信号变换为复信号,再利用微分算法求取信号的瞬时频率,然后对瞬时频率值进行Fourier变换,根据变换结果的谱得到码元速率的估计值。经对该方法仿真分析和实际应用,表明其具有准确性高、计算量小以及受噪声、滚降系数及载频影响小等特点。
In digital radio communication,symbol rate estimation is very important to modulation recognition,blind demodulation of non-cooperative communication and radio monitoring etc.A symbol rate estimation method based on the instantaneous frequency spectrum is introduced in this paper.First,real signals are turned into complex signals by means of Hilbert transform,then differential method makes the instantaneous frequency of the signals.And then Fourier transformation results in the instantaneous frequency spectrum.At last,the transform result brings the estimation of the symbol rate.Simulation and actual signals processing indicate,the method is simple,it has less complexity,it is influenced less by the noise,roll-off coefficients and the carrier frequency.And so the method is effective.
出处
《电气电子教学学报》
2010年第S1期50-54,共5页
Journal of Electrical and Electronic Education
关键词
瞬时频率
数字调制
码元速率估计
instantaneous frequency
digital modulation
symbol rate estimation
