8. Multicarrier Constant Envelope Composite Signal

This chapter takes a close look at how we can enable future development by implementing excellent signal designs with higher adaptability and flexibility. This chapter can also be regarded as a comprehensive example of how to apply the theory and techniques provided in this book to future signal design. In this chapter, we will see that under the conventional idea of separately optimizing carrier frequency, spreading modulation, and multiplexing, a Gordian knot is emerging in future GNSS signal design. In order to get out of the cycle of contradictions among measurement accuracy, services variety, RF compatibility, as well as multiplexing efficiency, the concept of using multicarrier modulation and multiplexing joint design is proposed. Performance analysis with some typical case studies demonstrates that the proposed multicarrier constant-envelope composite (MCC) signal provides a promising solution for the next generation GNSS signal design.