摘要
提出一种基于周期图解调2FSK信号的新算法.它将功率谱估计的周期图法与离散短时傅里叶变换相结合来求取接收信号的时频关系,在时频域对2FSK信号进行检测.研究了周期图解调算法的解调原理,并对关键参数进行了数学建模和理论推导,建立理论公式.实验结果表明,解调算法优于传统解调方法.另外,还通过对几种窗函数解调性能的仿真实验得出矩形窗的解调性能最差,汉宁窗解调性能最好的结论.
A new algorithm for demodulation of 2FSK signals based on periodogram is proposed, whereby the timefrequency relationship of received signals are worked out by using both periodogram method of power spectrum estimation and the DSTFT, then the 2FSK signals are detected in the time-frequency domain. In this paper, the principle of periodogram demodulation algorithm was studied, then the mathematical model was setup for the key parameters by using periodogram method. The theoretical formulas were given. The experimental results indicate that the presented algorithm is much better than traditional demodulation methods. In addition, the simulations were conducted for the demodulation performances of several window functions. The conclusion indicates that the demodulation performance of rectangular window is the worst, while the Hanning window presents the best demodulation performance.
出处
《应用科技》
CAS
2008年第4期18-21,共4页
Applied Science and Technology
关键词
周期图
2FSK信号
离散短时傅里叶变换
periodogram
2FSK signals
discrete short-time Fourier transform （DSTFT）
