基于I/Q正交双路的USB、LSB和DSB的一种识别算法

针对传统的单路P参数识别算法中必须保留载波残余频偏的缺点,提出了一种基于I/Q正交双路的识别算法.该算法直接将信号搬到基带,无需保留载波残余频偏,消除了残余频偏对较低频段信号识别和解调的不利影响.给出了上边带调制信号、下边带调制信号和双边带调制信号在不同信噪比(SNR)下的P参数值,并给出了其在不同SNR下的正确识别率.仿真结果表明,在SNR不小于0的情况下,平均正确识别率在95%以上.

An Algorithm Based on In-Phase and Quadrature Channels for USB/LSB/DSB Recognition

In order to overcome the shortcomings that a residual carrier excursion must be retained in the traditional P parameters algorithm based on single channel,an algorithm based on I/Q channels is presented.Signals are moved to the baseband directly and the residual carrier excursion does not need to be retained.Thus,it eliminates the adverse effect caused by the residual carrier excursion to the recognition and demodulation process at a low frequency stage.Values of P of USB(Upper Sideband Modulation),LSB(Lower Sideband Modulation) and DSB(Double Sideband Modulation) are given.The probability of identification of USB,LSB and DSB at different SNR(Signal-Noise Ratio) is also presented.The computer simulations show that the average probability of correct recognition is greater than 95% when SNR is no less than 0 dB.