Simulation analysis of constant-envelope multiplex algorithm for navigation signals in band-limited systems

First of all, the three constant-envelope multiplex methods have been introduced: Interplex/CASM (Coherent Adaptive Subcarrier Modulation), Majority voting and POCET (Phase-Optimized Constant-Envelope Transmission). And then four signals multiplex has been simulated as an illustration using the three kinds of constant envelope multiplex techniques respectively. According to simulation analysis, the highest multiplex efficiency has reached -0.64dB when using POCET. And then the performance of three multiplex algorithms in band-limited systems has been simulated and analyzed. With the bandwidth limit, the multiple signal after constant-envelope multiplex cannot keep its envelope constant any more, which makes the multiple signal distort and brings crosstalk among sub signals. Therefore to study the constant-envelope multiplex techniques with bandwidth limit will become the important issue for the further research on navigation signal multiplex techniques.