Modulation Recognition of Multi-Signals via Multi-Resolution Approach

A modulation recognition method based on multi-resolution analysis for time-frequency overlapped multi-signals is proposed. These signals include wireless communication signals, RADAR signals and satellites signals in single channel. The algorithm extracts the characteristic points of mixed signal by the multi-resolution analysis firstly, and then separates them through polynomial curve fitting, finally, estimates the parameters for each signal, respectively. This method is able to estimating the number of mixed signal components, calculating their symbol rates, also recognizing their modulation types from few sampling data. The method doesn't need any prior information, and has much more adaptability and robustness. Computer simulations have verified its validity and practicability to the engineering for the first time.