A best method of demodulation algorithm for UNFSK applied in transportation

作者：Shou, Yanfang; Xu, Jianmin; Deng, Xiaotao^*

来源：Expert Systems with Applications, 2011, 38(3): 1299-1303.

DOI：10.1016/j.eswa.2010.07.001

• UNFSK
• Demodulation
• Cycle extension
• Notch filtering
• Spectrum utilization
• Transportation

The frequency shift of the ultra-narrow frequency shift keying (UNFSK) is far less than the ordinary binary frequency shift keying (FSK) method. Because the two frequencies of UNFSK are extremely close, the traditional demodulation method cannot separate them successfully. This study aims to successfully demodulate the UNFSK signals by applying cycle extension and notch filter. The signal processing procedure is as follows: First, the sampling signals have been made cycle extension to enlarge their spectrum difference between signal 0 and 1; secondly, the cycle extension signals have been processed by the notch filter algorithm and finally, we could get the information by sentencing the filtering result. Finally, the method is applied in transportation. The simulation results proved that the algorithm greatly enhanced UNFSK signal demodulation performance, compared to the traditional demodulation method. There can be 2-3 dB improvement in performance, which is very suitable for UNFSK.

• 出版日期2011-3
• 单位中国人民解放军海军工程大学; 中国科学院电工研究所; 华南理工大学