甚低频信道小波调制方式研究

针对目前甚低频通信抗干扰能力,抗截获能力不理想问题,提出了甚低频通信系统的小波调制方式,该调制方式是将数据源经过逆小波变换发送信号,加入噪声后再经过小波变换在接收端接收,最后在接收端把接收信号同发送信号,得出其误码率。小波调制具有冗余度高、抗干扰性能强的特点。同时小波调制信号的时域波形类似于噪声,便于隐藏在噪声中传输,提高了系统的抗截获能力。与传统的频移键控(Frequency-shift Keying,FSK)调制比较,在3次联合估计下,小波调制方式的抗干扰能力优于传统的FSK调制方式。通过对甚低频通信系统进行仿真,验证了该算法的有效性。

Research on Wavelet Modulation Method in VLF Channel

In view of the problem that anti-jamming and anti-interception capability of VLF communication is not ideal, a wavelet modulation for VLF communication system is proposed. This modulation translates data source into transmitted signal by way of inverse discrete wavelet transform. After adding noise, the receiver receives the signal by way of discrete wavelet transform. At last, the data comparator compares the received data with the transmitted data and determines the error rate. Wavelet modulation has high redundancy and strong anti-interference performance. At the same time,the waveform of wavelet modulation is similar to noise,easy to hide in the noise transmission. In this way, the anti-interception ability of system is improved. Under the condition of joint estimation based on three observation values,the anti-interference ability of wavelet modulation is superior to traditional FSK modulation by comparison. And the simulation of VLF communication system verifies the effectiveness of this algorithm.