Sigma Shift Keying (SSK): Synchronization of Data Modulated Noise Transmissions

A synchronization approach is presented for a new modulation technique called Sigma Shift Keying (SSK). Advantages of SSK are minimal transmit power output and very low probability of intercept (POI). Digital modulation is performed by time-discrete changes of the variance of pure white Gaussian noise signals (WGN). SSK demodulation and detection becomes more complex as parameter estimation of the underlying processes requires nonlinear mathematical operations. Due to the WGN characteristic of the received signal, standard correlation approaches have to be replaced by a new synchronization method. Optimization of the nonlinear digital filter characteristics and implementation of an intelligent detection algorithm become necessary. Bit error curves will be shown.