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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) has been widely used in power line carrier communication systems. The traditional 2FSK modulation and demodulation are usually implemented by real signal processing. In this paper, a method of digital complex modulation and digital complex demodulation based on complex signal processing is proposed. The method generates complex low-pass signal according to the bit value of input data and performs low-pass filtering and complex modulation to realize 2FSK complex modulation. 2FSK input signal sampling, and the complex demodulation, low-pass filter to obtain complex low-pass signal, the complex low-pass signal and its delayed conjugate signal complex multiplication and the resulting product of the imaginary part of the decision to complete Complex demodulation.