基于复信号处理的二进制频移键控实现方法

Implementing Method of Binary Frequency Shift Keying Based on Complex Signal Processing

二进制频移键控(2FSK)在电力线载波通信系统中得到了广泛应用,传统的2FSK的调制与解调通常采用实信号处理的方法来实现。文中提出一种基于复信号处理的数字复调制与数字复解调的方法,该方法根据输入数据的比特值产生复低通信号,并进行低通滤波、复调制从而实现2FSK的复调制;对2FSK输入信号进行抽样,并进行复解调、低通滤波得到复低通信号,将复低通信号与其延迟后的共轭信号进行复数相乘并对所得到的积的虚部进行判定从而完成复解调。

Binary frequency shift keying （2FSK） is widely used in the power line carrier communication systems, however the traditional modulation and demodulation of 2FSK are often implemented using real signal processing. A novel method of digital complex modulation and complex demodulation based on complex signal processing to implement 2FSK is proposed. According to the bit value of the input data, the complex low-pass signal is produced and the signal is then low-pass filtered and complex modulated to finish complex modulation. The input signal of 2FSK is sampled, then complex demodulated and low-pass filtered to obtain complex low-pass signal. The complex low-pass signal and the conjugate signal of its delayed version are multiplied. According to the image part of the product, the complex demodulation is finished.